Commit b920de1b authored by David Howells's avatar David Howells Committed by Linus Torvalds

mn10300: add the MN10300/AM33 architecture to the kernel

Add architecture support for the MN10300/AM33 CPUs produced by MEI to the
kernel.

This patch also adds board support for the ASB2303 with the ASB2308 daughter
board, and the ASB2305.  The only processor supported is the MN103E010, which
is an AM33v2 core plus on-chip devices.

[akpm@linux-foundation.org: nuke cvs control strings]
Signed-off-by: default avatarMasakazu Urade <urade.masakazu@jp.panasonic.com>
Signed-off-by: default avatarKoichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ef3d5347
=========================
MN10300 FUNCTION CALL ABI
=========================
=======
GENERAL
=======
The MN10300/AM33 kernel runs in little-endian mode; big-endian mode is not
supported.
The stack grows downwards, and should always be 32-bit aligned. There are
separate stack pointer registers for userspace and the kernel.
================
ARGUMENT PASSING
================
The first two arguments (assuming up to 32-bits per argument) to a function are
passed in the D0 and D1 registers respectively; all other arguments are passed
on the stack.
If 64-bit arguments are being passed, then they are never split between
registers and the stack. If the first argument is a 64-bit value, it will be
passed in D0:D1. If the first argument is not a 64-bit value, but the second
is, the second will be passed entirely on the stack and D1 will be unused.
Arguments smaller than 32-bits are not coelesced within a register or a stack
word. For example, two byte-sized arguments will always be passed in separate
registers or word-sized stack slots.
=================
CALLING FUNCTIONS
=================
The caller must allocate twelve bytes on the stack for the callee's use before
it inserts a CALL instruction. The CALL instruction will write into the TOS
word, but won't actually modify the stack pointer; similarly, the RET
instruction reads from the TOS word of the stack, but doesn't move the stack
pointer beyond it.
Stack:
| |
| |
|---------------| SP+20
| 4th Arg |
|---------------| SP+16
| 3rd Arg |
|---------------| SP+12
| D1 Save Slot |
|---------------| SP+8
| D0 Save Slot |
|---------------| SP+4
| Return Addr |
|---------------| SP
| |
| |
The caller must leave space on the stack (hence an allocation of twelve bytes)
in which the callee may store the first two arguments.
============
RETURN VALUE
============
The return value is passed in D0 for an integer (or D0:D1 for a 64-bit value),
or A0 for a pointer.
If the return value is a value larger than 64-bits, or is a structure or an
array, then a hidden first argument will be passed to the callee by the caller:
this will point to a piece of memory large enough to hold the result of the
function. In this case, the callee will return the value in that piece of
memory, and no value will be returned in D0 or A0.
===================
REGISTER CLOBBERING
===================
The values in certain registers may be clobbered by the callee, and other
values must be saved:
Clobber: D0-D1, A0-A1, E0-E3
Save: D2-D3, A2-A3, E4-E7, SP
All other non-supervisor-only registers are clobberable (such as MDR, MCRL,
MCRH).
=================
SPECIAL REGISTERS
=================
Certain ordinary registers may carry special usage for the compiler:
A3: Frame pointer
E2: TLS pointer
==========
KERNEL ABI
==========
The kernel may use a slightly different ABI internally.
(*) E2
If CONFIG_MN10300_CURRENT_IN_E2 is defined, then the current task pointer
will be kept in the E2 register, and that register will be marked
unavailable for the compiler to use as a scratch register.
Normally the kernel uses something like:
MOV SP,An
AND 0xFFFFE000,An
MOV (An),Rm // Rm holds current
MOV (yyy,Rm) // Access current->yyy
To find the address of current; but since this option permits current to
be carried globally in an register, it can use:
MOV (yyy,E2) // Access current->yyy
instead.
===============
SYSTEM CALL ABI
===============
System calls are called with the following convention:
REGISTER ENTRY EXIT
=============== ======================= =======================
D0 Syscall number Return value
A0 1st syscall argument Saved
D1 2nd syscall argument Saved
A3 3rd syscall argument Saved
A2 4th syscall argument Saved
D3 5th syscall argument Saved
D2 6th syscall argument Saved
All other registers are saved. The layout is a consequence of the way the MOVM
instruction stores registers onto the stack.
=========================================
PART-SPECIFIC SOURCE COMPARTMENTALISATION
=========================================
The sources for various parts are compartmentalised at two different levels:
(1) Processor level
The "processor level" is a CPU core plus the other on-silicon
peripherals.
Processor-specific header files are divided among directories in a similar
way to the CPU level:
(*) include/asm-mn10300/proc-mn103e010/
Support for the AM33v2 CPU core.
The appropriate processor is selected by a CONFIG_MN10300_PROC_YYYY option
from the "Processor support" choice menu in the arch/mn10300/Kconfig file.
(2) Unit level
The "unit level" is a processor plus all the external peripherals
controlled by that processor.
Unit-specific header files are divided among directories in a similar way
to the CPU level; not only that, but specific sources may also be
segregated into separate directories under the arch directory:
(*) include/asm-mn10300/unit-asb2303/
(*) arch/mn10300/unit-asb2303/
Support for the ASB2303 board with an ASB2308 daughter board.
(*) include/asm-mn10300/unit-asb2305/
(*) arch/mn10300/unit-asb2305/
Support for the ASB2305 board.
The appropriate processor is selected by a CONFIG_MN10300_UNIT_ZZZZ option
from the "Unit type" choice menu in the arch/mn10300/Kconfig file.
============
COMPILE TIME
============
When the kernel is compiled, symbolic links will be made in the asm header file
directory for this arch:
include/asm-mn10300/proc => include/asm-mn10300/proc-YYYY/
include/asm-mn10300/unit => include/asm-mn10300/unit-ZZZZ/
So that the header files contained in those directories can be accessed without
lots of #ifdef-age.
The appropriate arch/mn10300/unit-ZZZZ directory will also be entered by the
compilation process; all other unit-specific directories will be ignored.
...@@ -2614,6 +2614,15 @@ L: linux-kernel@vger.kernel.org ...@@ -2614,6 +2614,15 @@ L: linux-kernel@vger.kernel.org
W: http://www.linux-mm.org W: http://www.linux-mm.org
S: Maintained S: Maintained
MEI MN10300/AM33 PORT
P: David Howells
M: dhowells@redhat.com
P: Koichi Yasutake
M: yasutake.koichi@jp.panasonic.com
L: linux-am33-list@redhat.com
W: ftp://ftp.redhat.com/pub/redhat/gnupro/AM33/
S: Maintained
MEMORY TECHNOLOGY DEVICES (MTD) MEMORY TECHNOLOGY DEVICES (MTD)
P: David Woodhouse P: David Woodhouse
M: dwmw2@infradead.org M: dwmw2@infradead.org
......
#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
mainmenu "Linux Kernel Configuration"
config MN10300
def_bool y
config AM33
def_bool y
config MMU
def_bool y
config HIGHMEM
def_bool n
config NUMA
def_bool n
config UID16
def_bool y
config RWSEM_GENERIC_SPINLOCK
def_bool y
config RWSEM_XCHGADD_ALGORITHM
bool
config GENERIC_HARDIRQS_NO__DO_IRQ
def_bool y
config GENERIC_CALIBRATE_DELAY
def_bool y
config GENERIC_FIND_NEXT_BIT
def_bool y
config GENERIC_HWEIGHT
def_bool y
config GENERIC_TIME
def_bool y
config GENERIC_BUG
def_bool y
config QUICKLIST
def_bool y
config ARCH_HAS_ILOG2_U32
def_bool y
config ARCH_SUPPORTS_AOUT
def_bool n
# Use the generic interrupt handling code in kernel/irq/
config GENERIC_HARDIRQS
def_bool y
config HOTPLUG_CPU
def_bool n
mainmenu "Matsushita MN10300/AM33 Kernel Configuration"
source "init/Kconfig"
menu "Matsushita MN10300 system setup"
choice
prompt "Unit type"
default MN10300_UNIT_ASB2303
help
This option specifies board for which the kernel will be
compiled. It affects the external peripherals catered for.
config MN10300_UNIT_ASB2303
bool "ASB2303"
config MN10300_UNIT_ASB2305
bool "ASB2305"
endchoice
choice
prompt "Processor support"
default MN10300_PROC_MN103E010
help
This option specifies the processor for which the kernel will be
compiled. It affects the on-chip peripherals catered for.
config MN10300_PROC_MN103E010
bool "MN103E010"
depends on MN10300_UNIT_ASB2303 || MN10300_UNIT_ASB2305
select MN10300_PROC_HAS_TTYSM0
select MN10300_PROC_HAS_TTYSM1
select MN10300_PROC_HAS_TTYSM2
endchoice
choice
prompt "Processor core support"
default MN10300_CPU_AM33V2
help
This option specifies the processor core for which the kernel will be
compiled. It affects the instruction set used.
config MN10300_CPU_AM33V2
bool "AM33v2"
endchoice
config FPU
bool "FPU present"
default y
depends on MN10300_PROC_MN103E010
choice
prompt "CPU Caching mode"
default MN10300_CACHE_WBACK
help
This option determines the caching mode for the kernel.
Write-Back caching mode involves the all reads and writes causing
the affected cacheline to be read into the cache first before being
operated upon. Memory is not then updated by a write until the cache
is filled and a cacheline needs to be displaced from the cache to
make room. Only at that point is it written back.
Write-Through caching only fetches cachelines from memory on a
read. Writes always get written directly to memory. If the affected
cacheline is also in cache, it will be updated too.
The final option is to turn of caching entirely.
config MN10300_CACHE_WBACK
bool "Write-Back"
config MN10300_CACHE_WTHRU
bool "Write-Through"
config MN10300_CACHE_DISABLED
bool "Disabled"
endchoice
menu "Memory layout options"
config KERNEL_RAM_BASE_ADDRESS
hex "Base address of kernel RAM"
default "0x90000000"
config INTERRUPT_VECTOR_BASE
hex "Base address of vector table"
default "0x90000000"
help
The base address of the vector table will be programmed into
the TBR register. It must be on 16MiB address boundary.
config KERNEL_TEXT_ADDRESS
hex "Base address of kernel"
default "0x90001000"
config KERNEL_ZIMAGE_BASE_ADDRESS
hex "Base address of compressed vmlinux image"
default "0x90700000"
endmenu
config PREEMPT
bool "Preemptible Kernel"
help
This option reduces the latency of the kernel when reacting to
real-time or interactive events by allowing a low priority process to
be preempted even if it is in kernel mode executing a system call.
This allows applications to run more reliably even when the system is
under load.
Say Y here if you are building a kernel for a desktop, embedded
or real-time system. Say N if you are unsure.
config PREEMPT_BKL
bool "Preempt The Big Kernel Lock"
depends on PREEMPT
default y
help
This option reduces the latency of the kernel by making the
big kernel lock preemptible.
Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.
config MN10300_CURRENT_IN_E2
bool "Hold current task address in E2 register"
default y
help
This option removes the E2/R2 register from the set available to gcc
for normal use and instead uses it to store the address of the
current process's task_struct whilst in the kernel.
This means the kernel doesn't need to calculate the address each time
"current" is used (take SP, AND with mask and dereference pointer
just to get the address), and instead can just use E2+offset
addressing each time.
This has no effect on userspace.
config MN10300_USING_JTAG
bool "Using JTAG to debug kernel"
default y
help
This options indicates that JTAG will be used to debug the kernel. It
suppresses the use of certain hardware debugging features, such as
single-stepping, which are taken over completely by the JTAG unit.
config MN10300_RTC
bool "Using MN10300 RTC"
depends on MN10300_PROC_MN103E010
default n
help
This option enables support for the RTC, thus enabling time to be
tracked, even when system is powered down. This is available on-chip
on the MN103E010.
config MN10300_WD_TIMER
bool "Using MN10300 watchdog timer"
default y
help
This options indicates that the watchdog timer will be used.
config PCI
bool "Use PCI"
depends on MN10300_UNIT_ASB2305
default y
help
Some systems (such as the ASB2305) have PCI onboard. If you have one
of these boards and you wish to use the PCI facilities, say Y here.
The PCI-HOWTO, available from
<http://www.tldp.org/docs.html#howto>, contains valuable
information about which PCI hardware does work under Linux and which
doesn't.
source "drivers/pci/Kconfig"
source "drivers/pcmcia/Kconfig"
menu "MN10300 internal serial options"
config MN10300_PROC_HAS_TTYSM0
bool
default n
config MN10300_PROC_HAS_TTYSM1
bool
default n
config MN10300_PROC_HAS_TTYSM2
bool
default n
config MN10300_TTYSM
bool "Support for ttySM serial ports"
depends on MN10300
default y
select SERIAL_CORE
help
This option enables support for the on-chip serial ports that the
MN10300 has available.
config MN10300_TTYSM_CONSOLE
bool "Support for console on ttySM serial ports"
depends on MN10300_TTYSM
select SERIAL_CORE_CONSOLE
help
This option enables support for a console on the on-chip serial ports
that the MN10300 has available.
#
# /dev/ttySM0
#
config MN10300_TTYSM0
bool "Enable SIF0 (/dev/ttySM0)"
depends on MN10300_TTYSM && MN10300_PROC_HAS_TTYSM0
help
Enable access to SIF0 through /dev/ttySM0 or gdb-stub
choice
prompt "Select the timer to supply the clock for SIF0"
default MN10300_TTYSM0_TIMER8
depends on MN10300_TTYSM0
config MN10300_TTYSM0_TIMER8
bool "Use timer 8 (16-bit)"
config MN10300_TTYSM0_TIMER2
bool "Use timer 2 (8-bit)"
endchoice
#
# /dev/ttySM1
#
config MN10300_TTYSM1
bool "Enable SIF1 (/dev/ttySM1)"
depends on MN10300_TTYSM && MN10300_PROC_HAS_TTYSM1
help
Enable access to SIF1 through /dev/ttySM1 or gdb-stub
choice
prompt "Select the timer to supply the clock for SIF1"
default MN10300_TTYSM0_TIMER9
depends on MN10300_TTYSM1
config MN10300_TTYSM1_TIMER9
bool "Use timer 9 (16-bit)"
config MN10300_TTYSM1_TIMER3
bool "Use timer 3 (8-bit)"
endchoice
#
# /dev/ttySM2
#
config MN10300_TTYSM2
bool "Enable SIF2 (/dev/ttySM2)"
depends on MN10300_TTYSM && MN10300_PROC_HAS_TTYSM2
help
Enable access to SIF2 through /dev/ttySM2 or gdb-stub
choice
prompt "Select the timer to supply the clock for SIF2"
default MN10300_TTYSM0_TIMER10
depends on MN10300_TTYSM2
config MN10300_TTYSM2_TIMER10
bool "Use timer 10 (16-bit)"
endchoice
config MN10300_TTYSM2_CTS
bool "Enable the use of the CTS line /dev/ttySM2"
depends on MN10300_TTYSM2
endmenu
source "mm/Kconfig"
menu "Power management options"
source kernel/power/Kconfig
endmenu
endmenu
menu "Executable formats"
source "fs/Kconfig.binfmt"
endmenu
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/mn10300/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
source "arch/mn10300/oprofile/Kconfig"
menu "Kernel hacking"
source "lib/Kconfig.debug"
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
depends on DEBUG_KERNEL
config DEBUG_DECOMPRESS_KERNEL
bool "Using serial port during decompressing kernel"
depends on DEBUG_KERNEL
default n
help
If you say Y here you will confirm the start and the end of
decompressing Linux seeing "Uncompressing Linux... " and
"Ok, booting the kernel.\n" on console.
config KPROBES
bool "Kprobes"
depends on DEBUG_KERNEL
help
Kprobes allows you to trap at almost any kernel address and
execute a callback function. register_kprobe() establishes
a probepoint and specifies the callback. Kprobes is useful
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
config GDBSTUB
bool "Remote GDB kernel debugging"
depends on DEBUG_KERNEL
select DEBUG_INFO
select FRAME_POINTER
help
If you say Y here, it will be possible to remotely debug the kernel
using gdb. This enlarges your kernel ELF image disk size by several
megabytes and requires a machine with more than 16 MB, better 32 MB
RAM to avoid excessive linking time. This is only useful for kernel
hackers. If unsure, say N.
config GDBSTUB_IMMEDIATE
bool "Break into GDB stub immediately"
depends on GDBSTUB
help
If you say Y here, GDB stub will break into the program as soon as
possible, leaving the program counter at the beginning of
start_kernel() in init/main.c.
config GDB_CONSOLE
bool "Console output to GDB"
depends on GDBSTUB
help
If you are using GDB for remote debugging over a serial port and
would like kernel messages to be formatted into GDB $O packets so
that GDB prints them as program output, say 'Y'.
config GDBSTUB_DEBUGGING
bool "Debug GDB stub by messages to serial port"
depends on GDBSTUB
help
This causes debugging messages to be displayed at various points
during execution of the GDB stub routines. Such messages will be
displayed on ttyS0 if that isn't the GDB stub's port, or ttySM0
otherwise.
config GDBSTUB_DEBUG_ENTRY
bool "Debug GDB stub entry"
depends on GDBSTUB_DEBUGGING
help
This option causes information to be displayed about entry to or exit
from the main GDB stub routine.
config GDBSTUB_DEBUG_PROTOCOL
bool "Debug GDB stub protocol"
depends on GDBSTUB_DEBUGGING
help
This option causes information to be displayed about the GDB remote
protocol messages generated exchanged with GDB.
config GDBSTUB_DEBUG_IO
bool "Debug GDB stub I/O"
depends on GDBSTUB_DEBUGGING
help
This option causes information to be displayed about GDB stub's
low-level I/O.
config GDBSTUB_DEBUG_BREAKPOINT
bool "Debug GDB stub breakpoint management"
depends on GDBSTUB_DEBUGGING
help
This option causes information to be displayed about GDB stub's
breakpoint management.
choice
prompt "GDB stub port"
default GDBSTUB_TTYSM0
depends on GDBSTUB
help
Select the serial port used for GDB-stub.
config GDBSTUB_ON_TTYSM0
bool "/dev/ttySM0 [SIF0]"
depends on MN10300_TTYSM0
select GDBSTUB_ON_TTYSMx
config GDBSTUB_ON_TTYSM1
bool "/dev/ttySM1 [SIF1]"
depends on MN10300_TTYSM1
select GDBSTUB_ON_TTYSMx
config GDBSTUB_ON_TTYSM2
bool "/dev/ttySM2 [SIF2]"
depends on MN10300_TTYSM2
select GDBSTUB_ON_TTYSMx
config GDBSTUB_ON_TTYS0
bool "/dev/ttyS0"
select GDBSTUB_ON_TTYSx
config GDBSTUB_ON_TTYS1
bool "/dev/ttyS1"
select GDBSTUB_ON_TTYSx
endchoice
config GDBSTUB_ON_TTYSMx
bool
depends on GDBSTUB_ON_TTYSM0 || GDBSTUB_ON_TTYSM1 || GDBSTUB_ON_TTYSM2
default y
config GDBSTUB_ON_TTYSx
bool
depends on GDBSTUB_ON_TTYS0 || GDBSTUB_ON_TTYS1
default y
endmenu
###############################################################################
#
# MN10300 Kernel makefile system specifications
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Modified by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
KBUILD_DEFCONFIG := asb2303_defconfig
CCSPECS := $(shell $(CC) -v 2>&1 | grep "^Reading specs from " | head -1 | cut -c20-)
CCDIR := $(strip $(patsubst %/specs,%,$(CCSPECS)))
KBUILD_CPPFLAGS += -nostdinc -I$(CCDIR)/include
LDFLAGS :=
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
#LDFLAGS_vmlinux := -Map linkmap.txt
CHECKFLAGS +=
PROCESSOR := unset
UNIT := unset
KBUILD_CFLAGS += -mam33 -mmem-funcs -DCPU=AM33
KBUILD_AFLAGS += -mam33 -DCPU=AM33
ifeq ($(CONFIG_MN10300_CURRENT_IN_E2),y)
KBUILD_CFLAGS += -ffixed-e2 -fcall-saved-e5
endif
ifeq ($(CONFIG_MN10300_PROC_MN103E010),y)
PROCESSOR := mn103e010
endif
ifeq ($(CONFIG_MN10300_UNIT_ASB2303),y)
UNIT := asb2303
endif
ifeq ($(CONFIG_MN10300_UNIT_ASB2305),y)
UNIT := asb2305
endif
head-y := arch/mn10300/kernel/head.o arch/mn10300/kernel/init_task.o
core-y += arch/mn10300/kernel/ arch/mn10300/mm/
ifneq ($(PROCESSOR),unset)
core-y += arch/mn10300/proc-$(PROCESSOR)/
endif
ifneq ($(UNIT),unset)
core-y += arch/mn10300/unit-$(UNIT)/
endif
libs-y += arch/mn10300/lib/
drivers-$(CONFIG_OPROFILE) += arch/mn10300/oprofile/
boot := arch/mn10300/boot
.PHONY: zImage
KBUILD_IMAGE := $(boot)/zImage
CLEAN_FILES += $(boot)/zImage
CLEAN_FILES += $(boot)/compressed/vmlinux
CLEAN_FILES += $(boot)/compressed/vmlinux.bin
CLEAN_FILES += $(boot)/compressed/vmlinux.bin.gz
zImage: vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
all: zImage
bootstrap:
$(Q)$(MAKEBOOT) bootstrap
archclean:
$(Q)$(MAKE) $(clean)=arch/mn10300/proc-mn103e010
$(Q)$(MAKE) $(clean)=arch/mn10300/unit-asb2303
$(Q)$(MAKE) $(clean)=arch/mn10300/unit-asb2305
define archhelp
echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
endef
# If you make sure the .S files get compiled with debug info,
# uncomment the following to disable optimisations
# that are unhelpful whilst debugging.
ifdef CONFIG_DEBUG_INFO
#KBUILD_CFLAGS += -O1
KBUILD_AFLAGS += -Wa,--gdwarf2
endif
###################################################################################################
#
# juggle some symlinks in the MN10300 asm include dir
#
# Update machine proc and unit symlinks if something which affects
# them changed. We use .proc / .unit to indicate when they were
# updated last, otherwise make uses the target directory mtime.
#
###################################################################################################
# processor specific definitions
include/asm-mn10300/.proc: $(wildcard include/config/proc/*.h) include/config/auto.conf
@echo ' SYMLINK include/asm-mn10300/proc -> include/asm-mn10300/proc-$(PROCESSOR)'
ifneq ($(KBUILD_SRC),)
$(Q)mkdir -p include/asm-mn10300
$(Q)ln -fsn $(srctree)/include/asm-mn10300/proc-$(PROCESSOR) include/asm-mn10300/proc
else
$(Q)ln -fsn proc-$(PROCESSOR) include/asm-mn10300/proc
endif
@touch $@
CLEAN_FILES += include/asm-mn10300/proc include/asm-mn10300/.proc
prepare: include/asm-mn10300/.proc
# unit specific definitions
include/asm-mn10300/.unit: $(wildcard include/config/unit/*.h) include/config/auto.conf
@echo ' SYMLINK include/asm-mn10300/unit -> include/asm-mn10300/unit-$(UNIT)'
ifneq ($(KBUILD_SRC),)
$(Q)mkdir -p include/asm-mn10300
$(Q)ln -fsn $(srctree)/include/asm-mn10300/unit-$(UNIT) include/asm-mn10300/unit
else
$(Q)ln -fsn unit-$(UNIT) include/asm-mn10300/unit
endif
@touch $@
CLEAN_FILES += include/asm-mn10300/unit include/asm-mn10300/.unit
prepare: include/asm-mn10300/.unit
# MN10300 kernel compressor and wrapper
#
# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
targets := vmlinux.bin zImage
subdir- := compressed
# ---------------------------------------------------------------------------
$(obj)/zImage: $(obj)/compressed/vmlinux FORCE
$(call if_changed,objcopy)
@echo 'Kernel: $@ is ready'
$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
$(call if_changed,objcopy)
$(obj)/compressed/vmlinux: FORCE
$(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@
#
# Create a compressed vmlinux image from the original vmlinux
#
targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o
LDFLAGS_vmlinux := -Ttext $(CONFIG_KERNEL_ZIMAGE_BASE_ADDRESS) -e startup_32
$(obj)/vmlinux: $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE
$(call if_changed,ld)
@:
$(obj)/vmlinux.bin: vmlinux FORCE
$(call if_changed,objcopy)
$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
$(call if_changed,gzip)
LDFLAGS_piggy.o := -r --format binary --oformat elf32-am33lin -T
$(obj)/piggy.o: $(obj)/vmlinux.lds $(obj)/vmlinux.bin.gz FORCE
$(call if_changed,ld)
/* Boot entry point for a compressed MN10300 kernel
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
.section .text
#define DEBUG
#include <linux/linkage.h>
#include <asm/cpu-regs.h>
.globl startup_32
startup_32:
# first save off parameters from bootloader
mov param_save_area,a0
mov d0,(a0)
mov d1,(4,a0)
mov d2,(8,a0)
mov sp,a3
mov decomp_stack+0x2000-4,a0
mov a0,sp
# invalidate and enable both of the caches
mov CHCTR,a0
clr d0
movhu d0,(a0) # turn off first
mov CHCTR_ICINV|CHCTR_DCINV,d0
movhu d0,(a0)
setlb
mov (a0),d0
btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy
lne
mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD,d0 # writethru dcache
movhu d0,(a0) # enable
# clear the BSS area
mov __bss_start,a0
mov _end,a1
clr d0
bssclear:
cmp a1,a0
bge bssclear_end
movbu d0,(a0)
inc a0
bra bssclear
bssclear_end:
# decompress the kernel
call decompress_kernel[],0
# disable caches again
mov CHCTR,a0
clr d0
movhu d0,(a0)
setlb
mov (a0),d0
btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy
lne
mov param_save_area,a0
mov (a0),d0
mov (4,a0),d1
mov (8,a0),d2
mov a3,sp
mov CONFIG_KERNEL_TEXT_ADDRESS,a0
jmp (a0)
.data
.align 4
param_save_area:
.rept 3
.word 0
.endr
.section .bss
.align 4
decomp_stack:
.space 0x2000
This diff is collapsed.
/* Internal definitions for the MN10300 kernel decompressor
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
extern int end;
/*
* vmlinux.lds
*/
extern char input_data[];
extern int input_len;
SECTIONS
{
.data : {
input_len = .;
LONG(input_data_end - input_data) input_data = .;
*(.data)
input_data_end = .;
}
}
#!/bin/sh
#
# arch/mn10300/boot/install -c.sh
#
# This file is subject to the terms and conditions of the GNU General Public
# Licence. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995 by Linus Torvalds
#
# Adapted from code in arch/i386/boot/Makefile by H. Peter Anvin
#
# "make install -c" script for i386 architecture
#
# Arguments:
# $1 - kernel version
# $2 - kernel image file
# $3 - kernel map file
# $4 - default install -c path (blank if root directory)
# $5 - boot rom file
#
# User may have a custom install -c script
rm -fr $4/../usr/include/linux $4/../usr/include/asm
install -c -m 0755 $2 $4/vmlinuz
install -c -m 0755 $5 $4/boot.rom
install -c -m 0755 -d $4/../usr/include/linux
cd $TOPDIR/include/linux
for i in `find . -maxdepth 1 -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux
done
install -c -m 0755 -d $4/../usr/include/linux/byteorder
cd $TOPDIR/include/linux/byteorder
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/byteorder
done
install -c -m 0755 -d $4/../usr/include/linux/lockd
cd $TOPDIR/include/linux/lockd
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/lockd
done
install -c -m 0755 -d $4/../usr/include/linux/netfilter_ipv4
cd $TOPDIR/include/linux/netfilter_ipv4
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/netfilter_ipv4
done
install -c -m 0755 -d $4/../usr/include/linux/nfsd
cd $TOPDIR/include/linux/nfsd
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/nfsd/$i
done
install -c -m 0755 -d $4/../usr/include/linux/raid
cd $TOPDIR/include/linux/raid
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/raid
done
install -c -m 0755 -d $4/../usr/include/linux/sunrpc
cd $TOPDIR/include/linux/sunrpc
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/linux/sunrpc
done
install -c -m 0755 -d $4/../usr/include/asm
cd $TOPDIR/include/asm
for i in `find . -name '*.h' -print`; do
install -c -m 0644 $i $4/../usr/include/asm
done
/*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1997 Martin Mares
*/
/*
* This file builds a disk-image from three different files:
*
* - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
* - setup: 8086 machine code, sets up system parm
* - system: 80386 code for actual system
*
* It does some checking that all files are of the correct type, and
* just writes the result to stdout, removing headers and padding to
* the right amount. It also writes some system data to stderr.
*/
/*
* Changes by tytso to allow root device specification
* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
* Cross compiling fixes by Gertjan van Wingerde, July 1996
* Rewritten by Martin Mares, April 1997
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <unistd.h>
#include <fcntl.h>
#include <asm/boot.h>
#define DEFAULT_MAJOR_ROOT 0
#define DEFAULT_MINOR_ROOT 0
/* Minimal number of setup sectors (see also bootsect.S) */
#define SETUP_SECTS 4
uint8_t buf[1024];
int fd;
int is_big_kernel;
__attribute__((noreturn))
void die(const char *str, ...)
{
va_list args;
va_start(args, str);
vfprintf(stderr, str, args);
fputc('\n', stderr);
exit(1);
}
void file_open(const char *name)
{
fd = open(name, O_RDONLY, 0);
if (fd < 0)
die("Unable to open `%s': %m", name);
}
__attribute__((noreturn))
void usage(void)
{
die("Usage: build [-b] bootsect setup system [rootdev] [> image]");
}
int main(int argc, char **argv)
{
unsigned int i, c, sz, setup_sectors;
uint32_t sys_size;
uint8_t major_root, minor_root;
struct stat sb;
if (argc > 2 && !strcmp(argv[1], "-b")) {
is_big_kernel = 1;
argc--, argv++;
}
if ((argc < 4) || (argc > 5))
usage();
if (argc > 4) {
if (!strcmp(argv[4], "CURRENT")) {
if (stat("/", &sb)) {
perror("/");
die("Couldn't stat /");
}
major_root = major(sb.st_dev);
minor_root = minor(sb.st_dev);
} else if (strcmp(argv[4], "FLOPPY")) {
if (stat(argv[4], &sb)) {
perror(argv[4]);
die("Couldn't stat root device.");
}
major_root = major(sb.st_rdev);
minor_root = minor(sb.st_rdev);
} else {
major_root = 0;
minor_root = 0;
}
} else {
major_root = DEFAULT_MAJOR_ROOT;
minor_root = DEFAULT_MINOR_ROOT;
}
fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
file_open(argv[1]);
i = read(fd, buf, sizeof(buf));
fprintf(stderr, "Boot sector %d bytes.\n", i);
if (i != 512)
die("Boot block must be exactly 512 bytes");
if (buf[510] != 0x55 || buf[511] != 0xaa)
die("Boot block hasn't got boot flag (0xAA55)");
buf[508] = minor_root;
buf[509] = major_root;
if (write(1, buf, 512) != 512)
die("Write call failed");
close(fd);
/* Copy the setup code */
file_open(argv[2]);
for (i = 0; (c = read(fd, buf, sizeof(buf))) > 0; i += c)
if (write(1, buf, c) != c)
die("Write call failed");
if (c != 0)
die("read-error on `setup'");
close(fd);
/* Pad unused space with zeros */
setup_sectors = (i + 511) / 512;
/* for compatibility with ancient versions of LILO. */
if (setup_sectors < SETUP_SECTS)
setup_sectors = SETUP_SECTS;
fprintf(stderr, "Setup is %d bytes.\n", i);
memset(buf, 0, sizeof(buf));
while (i < setup_sectors * 512) {
c = setup_sectors * 512 - i;
if (c > sizeof(buf))
c = sizeof(buf);
if (write(1, buf, c) != c)
die("Write call failed");
i += c;
}
file_open(argv[3]);
if (fstat(fd, &sb))
die("Unable to stat `%s': %m", argv[3]);
sz = sb.st_size;
fprintf(stderr, "System is %d kB\n", sz / 1024);
sys_size = (sz + 15) / 16;
/* 0x28000*16 = 2.5 MB, conservative estimate for the current maximum */
if (sys_size > (is_big_kernel ? 0x28000 : DEF_SYSSIZE))
die("System is too big. Try using %smodules.",
is_big_kernel ? "" : "bzImage or ");
if (sys_size > 0xffff)
fprintf(stderr,
"warning: kernel is too big for standalone boot "
"from floppy\n");
while (sz > 0) {
int l, n;
l = (sz > sizeof(buf)) ? sizeof(buf) : sz;
n = read(fd, buf, l);
if (n != l) {
if (n < 0)
die("Error reading %s: %m", argv[3]);
else
die("%s: Unexpected EOF", argv[3]);
}
if (write(1, buf, l) != l)
die("Write failed");
sz -= l;
}
close(fd);
/* Write sizes to the bootsector */
if (lseek(1, 497, SEEK_SET) != 497)
die("Output: seek failed");
buf[0] = setup_sectors;
if (write(1, buf, 1) != 1)
die("Write of setup sector count failed");
if (lseek(1, 500, SEEK_SET) != 500)
die("Output: seek failed");
buf[0] = (sys_size & 0xff);
buf[1] = ((sys_size >> 8) & 0xff);
if (write(1, buf, 2) != 2)
die("Write of image length failed");
return 0;
}
This diff is collapsed.
#
# Makefile for the MN10300-specific core kernel code
#
extra-y := head.o init_task.o vmlinux.lds
obj-y := process.o semaphore.o signal.o entry.o fpu.o traps.o irq.o \
ptrace.o setup.o time.o sys_mn10300.o io.o kthread.o \
switch_to.o mn10300_ksyms.o kernel_execve.o
obj-$(CONFIG_MN10300_WD_TIMER) += mn10300-watchdog.o mn10300-watchdog-low.o
obj-$(CONFIG_FPU) += fpu-low.o
obj-$(CONFIG_MN10300_TTYSM) += mn10300-serial.o mn10300-serial-low.o \
mn10300-debug.o
obj-$(CONFIG_GDBSTUB) += gdb-stub.o gdb-low.o
obj-$(CONFIG_GDBSTUB_ON_TTYSx) += gdb-io-serial.o gdb-io-serial-low.o
obj-$(CONFIG_GDBSTUB_ON_TTYSMx) += gdb-io-ttysm.o gdb-io-ttysm-low.o
ifneq ($(CONFIG_MN10300_CACHE_DISABLED),y)
obj-$(CONFIG_GDBSTUB) += gdb-cache.o
endif
obj-$(CONFIG_MN10300_RTC) += rtc.o
obj-$(CONFIG_PROFILE) += profile.o profile-low.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KPROBES) += kprobes.o
/*
* Generate definitions needed by assembly language modules.
* This code generates raw asm output which is post-processed
* to extract and format the required data.
*/
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/personality.h>
#include <asm/ucontext.h>
#include <asm/processor.h>
#include <asm/thread_info.h>
#include <asm/ptrace.h>
#include "sigframe.h"
#include "mn10300-serial.h"
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
#define BLANK() asm volatile("\n->")
#define OFFSET(sym, str, mem) \
DEFINE(sym, offsetof(struct str, mem));
void foo(void)
{
OFFSET(SIGCONTEXT_d0, sigcontext, d0);
OFFSET(SIGCONTEXT_d1, sigcontext, d1);
BLANK();
OFFSET(TI_task, thread_info, task);
OFFSET(TI_exec_domain, thread_info, exec_domain);
OFFSET(TI_flags, thread_info, flags);
OFFSET(TI_cpu, thread_info, cpu);
OFFSET(TI_preempt_count, thread_info, preempt_count);
OFFSET(TI_addr_limit, thread_info, addr_limit);
OFFSET(TI_restart_block, thread_info, restart_block);
BLANK();
OFFSET(REG_D0, pt_regs, d0);
OFFSET(REG_D1, pt_regs, d1);
OFFSET(REG_D2, pt_regs, d2);
OFFSET(REG_D3, pt_regs, d3);
OFFSET(REG_A0, pt_regs, a0);
OFFSET(REG_A1, pt_regs, a1);
OFFSET(REG_A2, pt_regs, a2);
OFFSET(REG_A3, pt_regs, a3);
OFFSET(REG_E0, pt_regs, e0);
OFFSET(REG_E1, pt_regs, e1);
OFFSET(REG_E2, pt_regs, e2);
OFFSET(REG_E3, pt_regs, e3);
OFFSET(REG_E4, pt_regs, e4);
OFFSET(REG_E5, pt_regs, e5);
OFFSET(REG_E6, pt_regs, e6);
OFFSET(REG_E7, pt_regs, e7);
OFFSET(REG_SP, pt_regs, sp);
OFFSET(REG_EPSW, pt_regs, epsw);
OFFSET(REG_PC, pt_regs, pc);
OFFSET(REG_LAR, pt_regs, lar);
OFFSET(REG_LIR, pt_regs, lir);
OFFSET(REG_MDR, pt_regs, mdr);
OFFSET(REG_MCVF, pt_regs, mcvf);
OFFSET(REG_MCRL, pt_regs, mcrl);
OFFSET(REG_MCRH, pt_regs, mcrh);
OFFSET(REG_MDRQ, pt_regs, mdrq);
OFFSET(REG_ORIG_D0, pt_regs, orig_d0);
OFFSET(REG_NEXT, pt_regs, next);
DEFINE(REG__END, sizeof(struct pt_regs));
BLANK();
OFFSET(THREAD_UREGS, thread_struct, uregs);
OFFSET(THREAD_PC, thread_struct, pc);
OFFSET(THREAD_SP, thread_struct, sp);
OFFSET(THREAD_A3, thread_struct, a3);
OFFSET(THREAD_USP, thread_struct, usp);
OFFSET(THREAD_FRAME, thread_struct, __frame);
BLANK();
DEFINE(CLONE_VM_asm, CLONE_VM);
DEFINE(CLONE_FS_asm, CLONE_FS);
DEFINE(CLONE_FILES_asm, CLONE_FILES);
DEFINE(CLONE_SIGHAND_asm, CLONE_SIGHAND);
DEFINE(CLONE_UNTRACED_asm, CLONE_UNTRACED);
DEFINE(SIGCHLD_asm, SIGCHLD);
BLANK();
OFFSET(EXEC_DOMAIN_handler, exec_domain, handler);
OFFSET(RT_SIGFRAME_sigcontext, rt_sigframe, uc.uc_mcontext);
DEFINE(PAGE_SIZE_asm, PAGE_SIZE);
OFFSET(__rx_buffer, mn10300_serial_port, rx_buffer);
OFFSET(__rx_inp, mn10300_serial_port, rx_inp);
OFFSET(__rx_outp, mn10300_serial_port, rx_outp);
OFFSET(__tx_info_buffer, mn10300_serial_port, uart.info);
OFFSET(__tx_xchar, mn10300_serial_port, tx_xchar);
OFFSET(__tx_break, mn10300_serial_port, tx_break);
OFFSET(__intr_flags, mn10300_serial_port, intr_flags);
OFFSET(__rx_icr, mn10300_serial_port, rx_icr);
OFFSET(__tx_icr, mn10300_serial_port, tx_icr);
OFFSET(__tm_icr, mn10300_serial_port, _tmicr);
OFFSET(__iobase, mn10300_serial_port, _iobase);
DEFINE(__UART_XMIT_SIZE, UART_XMIT_SIZE);
OFFSET(__xmit_buffer, uart_info, xmit.buf);
OFFSET(__xmit_head, uart_info, xmit.head);
OFFSET(__xmit_tail, uart_info, xmit.tail);
}
This diff is collapsed.
/* MN10300 Low level FPU management operations
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <asm/cpu-regs.h>
###############################################################################
#
# void fpu_init_state(void)
# - initialise the FPU
#
###############################################################################
.globl fpu_init_state
.type fpu_init_state,@function
fpu_init_state:
mov epsw,d0
or EPSW_FE,epsw
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
fmov 0,fs0
fmov fs0,fs1
fmov fs0,fs2
fmov fs0,fs3
fmov fs0,fs4
fmov fs0,fs5
fmov fs0,fs6
fmov fs0,fs7
fmov fs0,fs8
fmov fs0,fs9
fmov fs0,fs10
fmov fs0,fs11
fmov fs0,fs12
fmov fs0,fs13
fmov fs0,fs14
fmov fs0,fs15
fmov fs0,fs16
fmov fs0,fs17
fmov fs0,fs18
fmov fs0,fs19
fmov fs0,fs20
fmov fs0,fs21
fmov fs0,fs22
fmov fs0,fs23
fmov fs0,fs24
fmov fs0,fs25
fmov fs0,fs26
fmov fs0,fs27
fmov fs0,fs28
fmov fs0,fs29
fmov fs0,fs30
fmov fs0,fs31
fmov FPCR_INIT,fpcr
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
mov d0,epsw
ret [],0
.size fpu_init_state,.-fpu_init_state
###############################################################################
#
# void fpu_save(struct fpu_state_struct *)
# - save the fpu state
# - note that an FPU Operational exception might occur during this process
#
###############################################################################
.globl fpu_save
.type fpu_save,@function
fpu_save:
mov epsw,d1
or EPSW_FE,epsw /* enable the FPU so we can access it */
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
#endif
mov d0,a0
fmov fs0,(a0+)
fmov fs1,(a0+)
fmov fs2,(a0+)
fmov fs3,(a0+)
fmov fs4,(a0+)
fmov fs5,(a0+)
fmov fs6,(a0+)
fmov fs7,(a0+)
fmov fs8,(a0+)
fmov fs9,(a0+)
fmov fs10,(a0+)
fmov fs11,(a0+)
fmov fs12,(a0+)
fmov fs13,(a0+)
fmov fs14,(a0+)
fmov fs15,(a0+)
fmov fs16,(a0+)
fmov fs17,(a0+)
fmov fs18,(a0+)
fmov fs19,(a0+)
fmov fs20,(a0+)
fmov fs21,(a0+)
fmov fs22,(a0+)
fmov fs23,(a0+)
fmov fs24,(a0+)
fmov fs25,(a0+)
fmov fs26,(a0+)
fmov fs27,(a0+)
fmov fs28,(a0+)
fmov fs29,(a0+)
fmov fs30,(a0+)
fmov fs31,(a0+)
fmov fpcr,d0
mov d0,(a0)
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
#endif
mov d1,epsw
ret [],0
.size fpu_save,.-fpu_save
###############################################################################
#
# void fpu_restore(struct fpu_state_struct *)
# - restore the fpu state
# - note that an FPU Operational exception might occur during this process
#
###############################################################################
.globl fpu_restore
.type fpu_restore,@function
fpu_restore:
mov epsw,d1
or EPSW_FE,epsw /* enable the FPU so we can access it */
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
#endif
mov d0,a0
fmov (a0+),fs0
fmov (a0+),fs1
fmov (a0+),fs2
fmov (a0+),fs3
fmov (a0+),fs4
fmov (a0+),fs5
fmov (a0+),fs6
fmov (a0+),fs7
fmov (a0+),fs8
fmov (a0+),fs9
fmov (a0+),fs10
fmov (a0+),fs11
fmov (a0+),fs12
fmov (a0+),fs13
fmov (a0+),fs14
fmov (a0+),fs15
fmov (a0+),fs16
fmov (a0+),fs17
fmov (a0+),fs18
fmov (a0+),fs19
fmov (a0+),fs20
fmov (a0+),fs21
fmov (a0+),fs22
fmov (a0+),fs23
fmov (a0+),fs24
fmov (a0+),fs25
fmov (a0+),fs26
fmov (a0+),fs27
fmov (a0+),fs28
fmov (a0+),fs29
fmov (a0+),fs30
fmov (a0+),fs31
mov (a0),d0
fmov d0,fpcr
#ifdef CONFIG_MN10300_PROC_MN103E010
nop
nop
nop
#endif
mov d1,epsw
ret [],0
.size fpu_restore,.-fpu_restore
/* MN10300 FPU management
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <asm/uaccess.h>
#include <asm/fpu.h>
#include <asm/elf.h>
#include <asm/exceptions.h>
struct task_struct *fpu_state_owner;
/*
* handle an exception due to the FPU being disabled
*/
asmlinkage void fpu_disabled(struct pt_regs *regs, enum exception_code code)
{
struct task_struct *tsk = current;
if (!user_mode(regs))
die_if_no_fixup("An FPU Disabled exception happened in"
" kernel space\n",
regs, code);
#ifdef CONFIG_FPU
preempt_disable();
/* transfer the last process's FPU state to memory */
if (fpu_state_owner) {
fpu_save(&fpu_state_owner->thread.fpu_state);
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
}
/* the current process now owns the FPU state */
fpu_state_owner = tsk;
regs->epsw |= EPSW_FE;
/* load the FPU with the current process's FPU state or invent a new
* clean one if the process doesn't have one */
if (is_using_fpu(tsk)) {
fpu_restore(&tsk->thread.fpu_state);
} else {
fpu_init_state();
set_using_fpu(tsk);
}
preempt_enable();
#else
{
siginfo_t info;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void *) tsk->thread.uregs->pc;
info.si_code = FPE_FLTINV;
force_sig_info(SIGFPE, &info, tsk);
}
#endif /* CONFIG_FPU */
}
/*
* handle an FPU operational exception
* - there's a possibility that if the FPU is asynchronous, the signal might
* be meant for a process other than the current one
*/
asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code)
{
struct task_struct *tsk = fpu_state_owner;
siginfo_t info;
if (!user_mode(regs))
die_if_no_fixup("An FPU Operation exception happened in"
" kernel space\n",
regs, code);
if (!tsk)
die_if_no_fixup("An FPU Operation exception happened,"
" but the FPU is not in use",
regs, code);
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void *) tsk->thread.uregs->pc;
info.si_code = FPE_FLTINV;
#ifdef CONFIG_FPU
{
u32 fpcr;
/* get FPCR (we need to enable the FPU whilst we do this) */
asm volatile(" or %1,epsw \n"
#ifdef CONFIG_MN10300_PROC_MN103E010
" nop \n"
" nop \n"
" nop \n"
#endif
" fmov fpcr,%0 \n"
#ifdef CONFIG_MN10300_PROC_MN103E010
" nop \n"
" nop \n"
" nop \n"
#endif
" and %2,epsw \n"
: "=&d"(fpcr)
: "i"(EPSW_FE), "i"(~EPSW_FE)
);
if (fpcr & FPCR_EC_Z)
info.si_code = FPE_FLTDIV;
else if (fpcr & FPCR_EC_O)
info.si_code = FPE_FLTOVF;
else if (fpcr & FPCR_EC_U)
info.si_code = FPE_FLTUND;
else if (fpcr & FPCR_EC_I)
info.si_code = FPE_FLTRES;
}
#endif
force_sig_info(SIGFPE, &info, tsk);
}
/*
* save the FPU state to a signal context
*/
int fpu_setup_sigcontext(struct fpucontext *fpucontext)
{
#ifdef CONFIG_FPU
struct task_struct *tsk = current;
if (!is_using_fpu(tsk))
return 0;
/* transfer the current FPU state to memory and cause fpu_init() to be
* triggered by the next attempted FPU operation by the current
* process.
*/
preempt_disable();
if (fpu_state_owner == tsk) {
fpu_save(&tsk->thread.fpu_state);
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
fpu_state_owner = NULL;
}
preempt_enable();
/* we no longer have a valid current FPU state */
clear_using_fpu(tsk);
/* transfer the saved FPU state onto the userspace stack */
if (copy_to_user(fpucontext,
&tsk->thread.fpu_state,
min(sizeof(struct fpu_state_struct),
sizeof(struct fpucontext))))
return -1;
return 1;
#else
return 0;
#endif
}
/*
* kill a process's FPU state during restoration after signal handling
*/
void fpu_kill_state(struct task_struct *tsk)
{
#ifdef CONFIG_FPU
/* disown anything left in the FPU */
preempt_disable();
if (fpu_state_owner == tsk) {
fpu_state_owner->thread.uregs->epsw &= ~EPSW_FE;
fpu_state_owner = NULL;
}
preempt_enable();
#endif
/* we no longer have a valid current FPU state */
clear_using_fpu(tsk);
}
/*
* restore the FPU state from a signal context
*/
int fpu_restore_sigcontext(struct fpucontext *fpucontext)
{
struct task_struct *tsk = current;
int ret;
/* load up the old FPU state */
ret = copy_from_user(&tsk->thread.fpu_state,
fpucontext,
min(sizeof(struct fpu_state_struct),
sizeof(struct fpucontext)));
if (!ret)
set_using_fpu(tsk);
return ret;
}
/*
* fill in the FPU structure for a core dump
*/
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpreg)
{
struct task_struct *tsk = current;
int fpvalid;
fpvalid = is_using_fpu(tsk);
if (fpvalid) {
unlazy_fpu(tsk);
memcpy(fpreg, &tsk->thread.fpu_state, sizeof(*fpreg));
}
return fpvalid;
}
###############################################################################
#
# MN10300 Low-level cache purging routines for gdbstub
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/cache.h>
#include <asm/cpu-regs.h>
#include <asm/exceptions.h>
#include <asm/frame.inc>
#include <asm/serial-regs.h>
.text
###############################################################################
#
# GDB stub cache purge
#
###############################################################################
.type gdbstub_purge_cache,@function
ENTRY(gdbstub_purge_cache)
#######################################################################
# read the addresses tagged in the cache's tag RAM and attempt to flush
# those addresses specifically
# - we rely on the hardware to filter out invalid tag entry addresses
mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address
mov DCACHE_PURGE(0,0),a1 # dcache purge request address
mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
mn10300_dcache_flush_loop:
mov (a0),d0
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
or L1_CACHE_TAG_VALID,d0 # retain valid entries in the
# cache
mov d0,(a1) # conditional purge
mn10300_dcache_flush_skip:
add L1_CACHE_BYTES,a0
add L1_CACHE_BYTES,a1
add -1,d1
bne mn10300_dcache_flush_loop
;; # unconditionally flush and invalidate the dcache
;; mov DCACHE_PURGE(0,0),a1 # dcache purge request address
;; mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of
;; # entries
;;
;; gdbstub_purge_cache__dcache_loop:
;; mov (a1),d0 # unconditional purge
;;
;; add L1_CACHE_BYTES,a1
;; add -1,d1
;; bne gdbstub_purge_cache__dcache_loop
#######################################################################
# now invalidate the icache
mov CHCTR,a0
movhu (a0),a1
mov epsw,d1
and ~EPSW_IE,epsw
nop
nop
# disable the icache
and ~CHCTR_ICEN,d0
movhu d0,(a0)
# and wait for it to calm down
setlb
movhu (a0),d0
btst CHCTR_ICBUSY,d0
lne
# invalidate
or CHCTR_ICINV,d0
movhu d0,(a0)
# wait for the cache to finish
mov CHCTR,a0
setlb
movhu (a0),d0
btst CHCTR_ICBUSY,d0
lne
# and reenable it
movhu a1,(a0)
movhu (a0),d0 # read back to flush
# (SIGILLs all over without this)
mov d1,epsw
ret [],0
.size gdbstub_purge_cache,.-gdbstub_purge_cache
###############################################################################
#
# 16550 serial Rx interrupt handler for gdbstub I/O
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/cpu-regs.h>
#include <asm/thread_info.h>
#include <asm/frame.inc>
#include <asm/intctl-regs.h>
#include <asm/unit/serial.h>
.text
###############################################################################
#
# GDB stub serial receive interrupt entry point
# - intended to run at interrupt priority 0
#
###############################################################################
.globl gdbstub_io_rx_handler
.type gdbstub_io_rx_handler,@function
gdbstub_io_rx_handler:
movm [d2,d3,a2,a3],(sp)
#if 1
movbu (GDBPORT_SERIAL_IIR),d2
#endif
mov (gdbstub_rx_inp),a3
gdbstub_io_rx_more:
mov a3,a2
add 2,a3
and 0x00000fff,a3
mov (gdbstub_rx_outp),d3
cmp a3,d3
beq gdbstub_io_rx_overflow
movbu (GDBPORT_SERIAL_LSR),d3
btst UART_LSR_DR,d3
beq gdbstub_io_rx_done
movbu (GDBPORT_SERIAL_RX),d2
movbu d3,(gdbstub_rx_buffer+1,a2)
movbu d2,(gdbstub_rx_buffer,a2)
mov a3,(gdbstub_rx_inp)
bra gdbstub_io_rx_more
gdbstub_io_rx_done:
mov GxICR_DETECT,d2
movbu d2,(XIRQxICR(GDBPORT_SERIAL_IRQ)) # ACK the interrupt
movhu (XIRQxICR(GDBPORT_SERIAL_IRQ)),d2 # flush
movm (sp),[d2,d3,a2,a3]
bset 0x01,(gdbstub_busy)
beq gdbstub_io_rx_enter
rti
gdbstub_io_rx_overflow:
bset 0x01,(gdbstub_rx_overflow)
bra gdbstub_io_rx_done
gdbstub_io_rx_enter:
or EPSW_IE|EPSW_IM_1,epsw
add -4,sp
SAVE_ALL
mov 0xffffffff,d0
mov d0,(REG_ORIG_D0,fp)
mov 0x280,d1
mov fp,d0
call gdbstub_rx_irq[],0 # gdbstub_rx_irq(regs,excep)
and ~EPSW_IE,epsw
bclr 0x01,(gdbstub_busy)
.globl gdbstub_return
gdbstub_return:
RESTORE_ALL
.size gdbstub_io_rx_handler,.-gdbstub_io_rx_handler
/* 16550 serial driver for gdbstub I/O
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/nmi.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/gdb-stub.h>
#include <asm/exceptions.h>
#include <asm/serial-regs.h>
#include <asm/unit/serial.h>
/*
* initialise the GDB stub
*/
void gdbstub_io_init(void)
{
u16 tmp;
/* set up the serial port */
GDBPORT_SERIAL_LCR = UART_LCR_WLEN8; /* 1N8 */
GDBPORT_SERIAL_FCR = (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT);
FLOWCTL_CLEAR(DTR);
FLOWCTL_SET(RTS);
gdbstub_io_set_baud(115200);
/* we want to get serial receive interrupts */
XIRQxICR(GDBPORT_SERIAL_IRQ) = 0;
tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
IVAR0 = EXCEP_IRQ_LEVEL0;
set_intr_stub(EXCEP_IRQ_LEVEL0, gdbstub_io_rx_handler);
XIRQxICR(GDBPORT_SERIAL_IRQ) &= ~GxICR_REQUEST;
XIRQxICR(GDBPORT_SERIAL_IRQ) = GxICR_ENABLE | GxICR_LEVEL_0;
tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
GDBPORT_SERIAL_IER = UART_IER_RDI | UART_IER_RLSI;
/* permit level 0 IRQs to take place */
asm volatile(
" and %0,epsw \n"
" or %1,epsw \n"
:
: "i"(~EPSW_IM), "i"(EPSW_IE | EPSW_IM_1)
);
}
/*
* set up the GDB stub serial port baud rate timers
*/
void gdbstub_io_set_baud(unsigned baud)
{
unsigned value;
u8 lcr;
value = 18432000 / 16 / baud;
lcr = GDBPORT_SERIAL_LCR;
GDBPORT_SERIAL_LCR |= UART_LCR_DLAB;
GDBPORT_SERIAL_DLL = value & 0xff;
GDBPORT_SERIAL_DLM = (value >> 8) & 0xff;
GDBPORT_SERIAL_LCR = lcr;
}
/*
* wait for a character to come from the debugger
*/
int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
{
unsigned ix;
u8 ch, st;
*_ch = 0xff;
if (gdbstub_rx_unget) {
*_ch = gdbstub_rx_unget;
gdbstub_rx_unget = 0;
return 0;
}
try_again:
/* pull chars out of the buffer */
ix = gdbstub_rx_outp;
if (ix == gdbstub_rx_inp) {
if (nonblock)
return -EAGAIN;
#ifdef CONFIG_MN10300_WD_TIMER
watchdog_alert_counter = 0;
#endif /* CONFIG_MN10300_WD_TIMER */
goto try_again;
}
ch = gdbstub_rx_buffer[ix++];
st = gdbstub_rx_buffer[ix++];
gdbstub_rx_outp = ix & 0x00000fff;
if (st & UART_LSR_BI) {
gdbstub_proto("### GDB Rx Break Detected ###\n");
return -EINTR;
} else if (st & (UART_LSR_FE | UART_LSR_OE | UART_LSR_PE)) {
gdbstub_proto("### GDB Rx Error (st=%02x) ###\n", st);
return -EIO;
} else {
gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n", ch, st);
*_ch = ch & 0x7f;
return 0;
}
}
/*
* send a character to the debugger
*/
void gdbstub_io_tx_char(unsigned char ch)
{
FLOWCTL_SET(DTR);
LSR_WAIT_FOR(THRE);
/* FLOWCTL_WAIT_FOR(CTS); */
if (ch == 0x0a) {
GDBPORT_SERIAL_TX = 0x0d;
LSR_WAIT_FOR(THRE);
/* FLOWCTL_WAIT_FOR(CTS); */
}
GDBPORT_SERIAL_TX = ch;
FLOWCTL_CLEAR(DTR);
}
/*
* send a character to the debugger
*/
void gdbstub_io_tx_flush(void)
{
LSR_WAIT_FOR(TEMT);
LSR_WAIT_FOR(THRE);
FLOWCTL_CLEAR(DTR);
}
###############################################################################
#
# MN10300 On-chip serial Rx interrupt handler for GDB stub I/O
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/thread_info.h>
#include <asm/cpu-regs.h>
#include <asm/frame.inc>
#include <asm/intctl-regs.h>
#include <asm/unit/serial.h>
#include "mn10300-serial.h"
.text
###############################################################################
#
# GDB stub serial receive interrupt entry point
# - intended to run at interrupt priority 0
#
###############################################################################
.globl gdbstub_io_rx_handler
.type gdbstub_io_rx_handler,@function
gdbstub_io_rx_handler:
movm [d2,d3,a2,a3],(sp)
mov (gdbstub_rx_inp),a3
gdbstub_io_rx_more:
mov a3,a2
add 2,a3
and PAGE_SIZE_asm-1,a3
mov (gdbstub_rx_outp),d3
cmp a3,d3
beq gdbstub_io_rx_overflow
movbu (SCgSTR),d3
btst SC01STR_RBF,d3
beq gdbstub_io_rx_done
movbu (SCgRXB),d2
movbu d3,(gdbstub_rx_buffer+1,a2)
movbu d2,(gdbstub_rx_buffer,a2)
mov a3,(gdbstub_rx_inp)
bra gdbstub_io_rx_more
gdbstub_io_rx_done:
mov GxICR_DETECT,d2
movbu d2,(GxICR(SCgRXIRQ)) # ACK the interrupt
movhu (GxICR(SCgRXIRQ)),d2 # flush
movm (sp),[d2,d3,a2,a3]
bset 0x01,(gdbstub_busy)
beq gdbstub_io_rx_enter
rti
gdbstub_io_rx_overflow:
bset 0x01,(gdbstub_rx_overflow)
bra gdbstub_io_rx_done
###############################################################################
#
# debugging interrupt - enter the GDB stub proper
#
###############################################################################
gdbstub_io_rx_enter:
or EPSW_IE|EPSW_IM_1,epsw
add -4,sp
SAVE_ALL
mov 0xffffffff,d0
mov d0,(REG_ORIG_D0,fp)
mov 0x280,d1
mov fp,d0
call gdbstub_rx_irq[],0 # gdbstub_io_rx_irq(regs,excep)
and ~EPSW_IE,epsw
bclr 0x01,(gdbstub_busy)
.globl gdbstub_return
gdbstub_return:
RESTORE_ALL
.size gdbstub_io_rx_handler,.-gdbstub_io_rx_handler
/* MN10300 On-chip serial driver for gdbstub I/O
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/gdb-stub.h>
#include <asm/exceptions.h>
#include <asm/unit/clock.h>
#include "mn10300-serial.h"
#if defined(CONFIG_GDBSTUB_ON_TTYSM0)
struct mn10300_serial_port *const gdbstub_port = &mn10300_serial_port_sif0;
#elif defined(CONFIG_GDBSTUB_ON_TTYSM1)
struct mn10300_serial_port *const gdbstub_port = &mn10300_serial_port_sif1;
#else
struct mn10300_serial_port *const gdbstub_port = &mn10300_serial_port_sif2;
#endif
/*
* initialise the GDB stub I/O routines
*/
void __init gdbstub_io_init(void)
{
uint16_t scxctr;
int tmp;
switch (gdbstub_port->clock_src) {
case MNSCx_CLOCK_SRC_IOCLK:
gdbstub_port->ioclk = MN10300_IOCLK;
break;
#ifdef MN10300_IOBCLK
case MNSCx_CLOCK_SRC_IOBCLK:
gdbstub_port->ioclk = MN10300_IOBCLK;
break;
#endif
default:
BUG();
}
/* set up the serial port */
gdbstub_io_set_baud(115200);
/* we want to get serial receive interrupts */
set_intr_level(gdbstub_port->rx_irq, GxICR_LEVEL_0);
set_intr_level(gdbstub_port->tx_irq, GxICR_LEVEL_0);
set_intr_stub(EXCEP_IRQ_LEVEL0, gdbstub_io_rx_handler);
*gdbstub_port->rx_icr |= GxICR_ENABLE;
tmp = *gdbstub_port->rx_icr;
/* enable the device */
scxctr = SC01CTR_CLN_8BIT; /* 1N8 */
switch (gdbstub_port->div_timer) {
case MNSCx_DIV_TIMER_16BIT:
scxctr |= SC0CTR_CK_TM8UFLOW_8; /* == SC1CTR_CK_TM9UFLOW_8
== SC2CTR_CK_TM10UFLOW_8 */
break;
case MNSCx_DIV_TIMER_8BIT:
scxctr |= SC0CTR_CK_TM2UFLOW_8;
break;
}
scxctr |= SC01CTR_TXE | SC01CTR_RXE;
*gdbstub_port->_control = scxctr;
tmp = *gdbstub_port->_control;
/* permit level 0 IRQs only */
asm volatile(
" and %0,epsw \n"
" or %1,epsw \n"
:
: "i"(~EPSW_IM), "i"(EPSW_IE|EPSW_IM_1)
);
}
/*
* set up the GDB stub serial port baud rate timers
*/
void gdbstub_io_set_baud(unsigned baud)
{
const unsigned bits = 10; /* 1 [start] + 8 [data] + 0 [parity] +
* 1 [stop] */
unsigned long ioclk = gdbstub_port->ioclk;
unsigned xdiv, tmp;
uint16_t tmxbr;
uint8_t tmxmd;
if (!baud) {
baud = 9600;
} else if (baud == 134) {
baud = 269; /* 134 is really 134.5 */
xdiv = 2;
}
try_alternative:
xdiv = 1;
switch (gdbstub_port->div_timer) {
case MNSCx_DIV_TIMER_16BIT:
tmxmd = TM8MD_SRC_IOCLK;
tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 65535)
goto timer_okay;
tmxmd = TM8MD_SRC_IOCLK_8;
tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 65535)
goto timer_okay;
tmxmd = TM8MD_SRC_IOCLK_32;
tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 65535)
goto timer_okay;
break;
case MNSCx_DIV_TIMER_8BIT:
tmxmd = TM2MD_SRC_IOCLK;
tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 255)
goto timer_okay;
tmxmd = TM2MD_SRC_IOCLK_8;
tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 255)
goto timer_okay;
tmxmd = TM2MD_SRC_IOCLK_32;
tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
if (tmp > 0 && tmp <= 255)
goto timer_okay;
break;
}
/* as a last resort, if the quotient is zero, default to 9600 bps */
baud = 9600;
goto try_alternative;
timer_okay:
gdbstub_port->uart.timeout = (2 * bits * HZ) / baud;
gdbstub_port->uart.timeout += HZ / 50;
/* set the timer to produce the required baud rate */
switch (gdbstub_port->div_timer) {
case MNSCx_DIV_TIMER_16BIT:
*gdbstub_port->_tmxmd = 0;
*gdbstub_port->_tmxbr = tmxbr;
*gdbstub_port->_tmxmd = TM8MD_INIT_COUNTER;
*gdbstub_port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
break;
case MNSCx_DIV_TIMER_8BIT:
*gdbstub_port->_tmxmd = 0;
*(volatile u8 *) gdbstub_port->_tmxbr = (u8)tmxbr;
*gdbstub_port->_tmxmd = TM2MD_INIT_COUNTER;
*gdbstub_port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
break;
}
}
/*
* wait for a character to come from the debugger
*/
int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
{
unsigned ix;
u8 ch, st;
*_ch = 0xff;
if (gdbstub_rx_unget) {
*_ch = gdbstub_rx_unget;
gdbstub_rx_unget = 0;
return 0;
}
try_again:
/* pull chars out of the buffer */
ix = gdbstub_rx_outp;
if (ix == gdbstub_rx_inp) {
if (nonblock)
return -EAGAIN;
#ifdef CONFIG_MN10300_WD_TIMER
watchdog_alert_counter = 0;
#endif /* CONFIG_MN10300_WD_TIMER */
goto try_again;
}
ch = gdbstub_rx_buffer[ix++];
st = gdbstub_rx_buffer[ix++];
gdbstub_rx_outp = ix & (PAGE_SIZE - 1);
st &= SC01STR_RXF | SC01STR_RBF | SC01STR_FEF | SC01STR_PEF |
SC01STR_OEF;
/* deal with what we've got
* - note that the UART doesn't do BREAK-detection for us
*/
if (st & SC01STR_FEF && ch == 0) {
switch (gdbstub_port->rx_brk) {
case 0: gdbstub_port->rx_brk = 1; goto try_again;
case 1: gdbstub_port->rx_brk = 2; goto try_again;
case 2:
gdbstub_port->rx_brk = 3;
gdbstub_proto("### GDB MNSERIAL Rx Break Detected"
" ###\n");
return -EINTR;
default:
goto try_again;
}
} else if (st & SC01STR_FEF) {
if (gdbstub_port->rx_brk)
goto try_again;
gdbstub_proto("### GDB MNSERIAL Framing Error ###\n");
return -EIO;
} else if (st & SC01STR_OEF) {
if (gdbstub_port->rx_brk)
goto try_again;
gdbstub_proto("### GDB MNSERIAL Overrun Error ###\n");
return -EIO;
} else if (st & SC01STR_PEF) {
if (gdbstub_port->rx_brk)
goto try_again;
gdbstub_proto("### GDB MNSERIAL Parity Error ###\n");
return -EIO;
} else {
/* look for the tail-end char on a break run */
if (gdbstub_port->rx_brk == 3) {
switch (ch) {
case 0xFF:
case 0xFE:
case 0xFC:
case 0xF8:
case 0xF0:
case 0xE0:
case 0xC0:
case 0x80:
case 0x00:
gdbstub_port->rx_brk = 0;
goto try_again;
default:
break;
}
}
gdbstub_port->rx_brk = 0;
gdbstub_io("### GDB Rx %02x (st=%02x) ###\n", ch, st);
*_ch = ch & 0x7f;
return 0;
}
}
/*
* send a character to the debugger
*/
void gdbstub_io_tx_char(unsigned char ch)
{
while (*gdbstub_port->_status & SC01STR_TBF)
continue;
if (ch == 0x0a) {
*(u8 *) gdbstub_port->_txb = 0x0d;
while (*gdbstub_port->_status & SC01STR_TBF)
continue;
}
*(u8 *) gdbstub_port->_txb = ch;
}
/*
* flush the transmission buffers
*/
void gdbstub_io_tx_flush(void)
{
while (*gdbstub_port->_status & (SC01STR_TBF | SC01STR_TXF))
continue;
}
###############################################################################
#
# MN10300 Low-level gdbstub routines
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/cache.h>
#include <asm/cpu-regs.h>
#include <asm/exceptions.h>
#include <asm/frame.inc>
#include <asm/serial-regs.h>
.text
###############################################################################
#
# GDB stub read memory with guard
# - D0 holds the memory address to read
# - D1 holds the address to store the byte into
#
###############################################################################
.globl gdbstub_read_byte_guard
.globl gdbstub_read_byte_cont
ENTRY(gdbstub_read_byte)
mov d0,a0
mov d1,a1
clr d0
gdbstub_read_byte_guard:
movbu (a0),d1
gdbstub_read_byte_cont:
movbu d1,(a1)
ret [],0
.globl gdbstub_read_word_guard
.globl gdbstub_read_word_cont
ENTRY(gdbstub_read_word)
mov d0,a0
mov d1,a1
clr d0
gdbstub_read_word_guard:
movhu (a0),d1
gdbstub_read_word_cont:
movhu d1,(a1)
ret [],0
.globl gdbstub_read_dword_guard
.globl gdbstub_read_dword_cont
ENTRY(gdbstub_read_dword)
mov d0,a0
mov d1,a1
clr d0
gdbstub_read_dword_guard:
mov (a0),d1
gdbstub_read_dword_cont:
mov d1,(a1)
ret [],0
###############################################################################
#
# GDB stub write memory with guard
# - D0 holds the byte to store
# - D1 holds the memory address to write
#
###############################################################################
.globl gdbstub_write_byte_guard
.globl gdbstub_write_byte_cont
ENTRY(gdbstub_write_byte)
mov d0,a0
mov d1,a1
clr d0
gdbstub_write_byte_guard:
movbu a0,(a1)
gdbstub_write_byte_cont:
ret [],0
.globl gdbstub_write_word_guard
.globl gdbstub_write_word_cont
ENTRY(gdbstub_write_word)
mov d0,a0
mov d1,a1
clr d0
gdbstub_write_word_guard:
movhu a0,(a1)
gdbstub_write_word_cont:
ret [],0
.globl gdbstub_write_dword_guard
.globl gdbstub_write_dword_cont
ENTRY(gdbstub_write_dword)
mov d0,a0
mov d1,a1
clr d0
gdbstub_write_dword_guard:
mov a0,(a1)
gdbstub_write_dword_cont:
ret [],0
###############################################################################
#
# GDB stub BUG() trap
#
###############################################################################
ENTRY(__gdbstub_bug_trap)
.byte 0xF7,0xF7 # don't use 0xFF as the JTAG unit preempts that
ret [],0
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/* Boot entry point for MN10300 kernel
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/threads.h>
#include <linux/linkage.h>
#include <linux/serial_reg.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/frame.inc>
#include <asm/param.h>
#include <asm/unit/serial.h>
.section .text.head,"ax"
###############################################################################
#
# bootloader entry point
#
###############################################################################
.globl _start
.type _start,@function
_start:
# save commandline pointer
mov d0,a3
# preload the PGD pointer register
mov swapper_pg_dir,d0
mov d0,(PTBR)
# turn on the TLBs
mov MMUCTR_IIV|MMUCTR_DIV,d0
mov d0,(MMUCTR)
mov MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE,d0
mov d0,(MMUCTR)
# turn on AM33v2 exception handling mode and set the trap table base
movhu (CPUP),d0
or CPUP_EXM_AM33V2,d0
movhu d0,(CPUP)
mov CONFIG_INTERRUPT_VECTOR_BASE,d0
mov d0,(TBR)
# invalidate and enable both of the caches
mov CHCTR,a0
clr d0
movhu d0,(a0) # turn off first
mov CHCTR_ICINV|CHCTR_DCINV,d0
movhu d0,(a0)
setlb
mov (a0),d0
btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy
lne
#ifndef CONFIG_MN10300_CACHE_DISABLED
#ifdef CONFIG_MN10300_CACHE_WBACK
#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0
#else
mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK|CHCTR_DCALMD,d0
#endif /* CACHE_DISABLED */
#else
mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0
#endif /* WBACK */
movhu d0,(a0) # enable
#endif /* NOWRALLOC */
# turn on RTS on the debug serial port if applicable
#ifdef CONFIG_MN10300_UNIT_ASB2305
bset UART_MCR_RTS,(ASB2305_DEBUG_MCR)
#endif
# clear the BSS area
mov __bss_start,a0
mov __bss_stop,a1
clr d0
bssclear:
cmp a1,a0
bge bssclear_end
mov d0,(a0)
inc4 a0
bra bssclear
bssclear_end:
# retrieve the parameters (including command line) before we overwrite
# them
cmp 0xabadcafe,d1
bne __no_parameters
__copy_parameters:
mov redboot_command_line,a0
mov a0,a1
add COMMAND_LINE_SIZE,a1
1:
movbu (a3),d0
inc a3
movbu d0,(a0)
inc a0
cmp a1,a0
blt 1b
mov redboot_platform_name,a0
mov a0,a1
add COMMAND_LINE_SIZE,a1
mov d2,a3
1:
movbu (a3),d0
inc a3
movbu d0,(a0)
inc a0
cmp a1,a0
blt 1b
__no_parameters:
# set up the registers with recognisable rubbish in them
mov init_thread_union+THREAD_SIZE-12,sp
mov 0xea01eaea,d0
mov d0,(4,sp) # EPSW save area
mov 0xea02eaea,d0
mov d0,(8,sp) # PC save area
mov 0xeb0060ed,d0
mov d0,mdr
mov 0xeb0061ed,d0
mov d0,mdrq
mov 0xeb0062ed,d0
mov d0,mcrh
mov 0xeb0063ed,d0
mov d0,mcrl
mov 0xeb0064ed,d0
mov d0,mcvf
mov 0xed0065ed,a3
mov a3,usp
mov 0xed00e0ed,e0
mov 0xed00e1ed,e1
mov 0xed00e2ed,e2
mov 0xed00e3ed,e3
mov 0xed00e4ed,e4
mov 0xed00e5ed,e5
mov 0xed00e6ed,e6
mov 0xed00e7ed,e7
mov 0xed00d0ed,d0
mov 0xed00d1ed,d1
mov 0xed00d2ed,d2
mov 0xed00d3ed,d3
mov 0xed00a0ed,a0
mov 0xed00a1ed,a1
mov 0xed00a2ed,a2
mov 0,a3
# set up the initial kernel stack
SAVE_ALL
mov 0xffffffff,d0
mov d0,(REG_ORIG_D0,fp)
# put different recognisable rubbish in the regs
mov 0xfb0060ed,d0
mov d0,mdr
mov 0xfb0061ed,d0
mov d0,mdrq
mov 0xfb0062ed,d0
mov d0,mcrh
mov 0xfb0063ed,d0
mov d0,mcrl
mov 0xfb0064ed,d0
mov d0,mcvf
mov 0xfd0065ed,a0
mov a0,usp
mov 0xfd00e0ed,e0
mov 0xfd00e1ed,e1
mov 0xfd00e2ed,e2
mov 0xfd00e3ed,e3
mov 0xfd00e4ed,e4
mov 0xfd00e5ed,e5
mov 0xfd00e6ed,e6
mov 0xfd00e7ed,e7
mov 0xfd00d0ed,d0
mov 0xfd00d1ed,d1
mov 0xfd00d2ed,d2
mov 0xfd00d3ed,d3
mov 0xfd00a0ed,a0
mov 0xfd00a1ed,a1
mov 0xfd00a2ed,a2
# we may be holding current in E2
#ifdef CONFIG_MN10300_CURRENT_IN_E2
mov init_task,e2
#endif
# initialise the processor and the unit
call processor_init[],0
call unit_init[],0
#ifdef CONFIG_GDBSTUB
call gdbstub_init[],0
#ifdef CONFIG_GDBSTUB_IMMEDIATE
.globl __gdbstub_pause
__gdbstub_pause:
bra __gdbstub_pause
#endif
#endif
jmp start_kernel
.size _start, _start-.
ENTRY(__head_end)
/*
* This is initialized to disallow all access to the low 2G region
* - the high 2G region is managed directly by the MMU
* - range 0x70000000-0x7C000000 are initialised for use by VMALLOC
*/
.section .bss
.balign PAGE_SIZE
ENTRY(swapper_pg_dir)
.space PTRS_PER_PGD*4
/*
* The page tables are initialized to only 8MB here - the final page
* tables are set up later depending on memory size.
*/
.balign PAGE_SIZE
ENTRY(empty_zero_page)
.space PAGE_SIZE
.balign PAGE_SIZE
ENTRY(empty_bad_page)
.space PAGE_SIZE
.balign PAGE_SIZE
ENTRY(empty_bad_pte_table)
.space PAGE_SIZE
.balign PAGE_SIZE
ENTRY(large_page_table)
.space PAGE_SIZE
.balign PAGE_SIZE
ENTRY(kernel_vmalloc_ptes)
.space ((VMALLOC_END-VMALLOC_START)/PAGE_SIZE)*4
/* MN10300 Initial task definitions
*
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/init_task.h>
#include <linux/fs.h>
#include <linux/mqueue.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
static struct fs_struct init_fs = INIT_FS;
static struct files_struct init_files = INIT_FILES;
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
struct mm_struct init_mm = INIT_MM(init_mm);
EXPORT_SYMBOL(init_mm);
/*
* Initial thread structure.
*
* We need to make sure that this is THREAD_SIZE aligned due to the
* way process stacks are handled. This is done by having a special
* "init_task" linker map entry..
*/
union thread_union init_thread_union
__attribute__((__section__(".data.init_task"))) =
{ INIT_THREAD_INFO(init_task) };
/*
* Initial task structure.
*
* All other task structs will be allocated on slabs in fork.c
*/
struct task_struct init_task = INIT_TASK(init_task);
EXPORT_SYMBOL(init_task);
/* Internal definitions for the arch part of the core kernel
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
/*
* kthread.S
*/
extern int kernel_thread_helper(int);
/*
* entry.S
*/
extern void ret_from_fork(struct task_struct *) __attribute__((noreturn));
/* MN10300 Misaligned multibyte-word I/O
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <asm/io.h>
/*
* output data from a potentially misaligned buffer
*/
void __outsl(unsigned long addr, const void *buffer, int count)
{
const unsigned char *buf = buffer;
unsigned long val;
while (count--) {
memcpy(&val, buf, 4);
outl(val, addr);
buf += 4;
}
}
EXPORT_SYMBOL(__outsl);
/* MN10300 Arch-specific interrupt handling
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <asm/setup.h>
unsigned long __mn10300_irq_enabled_epsw = EPSW_IE | EPSW_IM_7;
EXPORT_SYMBOL(__mn10300_irq_enabled_epsw);
atomic_t irq_err_count;
/*
* MN10300 INTC controller operations
*/
static void mn10300_cpupic_disable(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_DETECT;
tmp = GxICR(irq);
}
static void mn10300_cpupic_enable(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE;
tmp = GxICR(irq);
}
static void mn10300_cpupic_ack(unsigned int irq)
{
u16 tmp;
*(volatile u8 *) &GxICR(irq) = GxICR_DETECT;
tmp = GxICR(irq);
}
static void mn10300_cpupic_mask(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL);
tmp = GxICR(irq);
}
static void mn10300_cpupic_mask_ack(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_DETECT;
tmp = GxICR(irq);
}
static void mn10300_cpupic_unmask(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE | GxICR_DETECT;
tmp = GxICR(irq);
}
static void mn10300_cpupic_end(unsigned int irq)
{
u16 tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE;
tmp = GxICR(irq);
}
static struct irq_chip mn10300_cpu_pic = {
.name = "cpu",
.disable = mn10300_cpupic_disable,
.enable = mn10300_cpupic_enable,
.ack = mn10300_cpupic_ack,
.mask = mn10300_cpupic_mask,
.mask_ack = mn10300_cpupic_mask_ack,
.unmask = mn10300_cpupic_unmask,
.end = mn10300_cpupic_end,
};
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
*/
void ack_bad_irq(int irq)
{
printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq);
}
/*
* change the level at which an IRQ executes
* - must not be called whilst interrupts are being processed!
*/
void set_intr_level(int irq, u16 level)
{
u16 tmp;
if (in_interrupt())
BUG();
tmp = GxICR(irq);
GxICR(irq) = (tmp & GxICR_ENABLE) | level;
tmp = GxICR(irq);
}
/*
* mark an interrupt to be ACK'd after interrupt handlers have been run rather
* than before
* - see Documentation/mn10300/features.txt
*/
void set_intr_postackable(int irq)
{
set_irq_handler(irq, handle_level_irq);
}
/*
* initialise the interrupt system
*/
void __init init_IRQ(void)
{
int irq;
for (irq = 0; irq < NR_IRQS; irq++)
if (irq_desc[irq].chip == &no_irq_type)
set_irq_chip_and_handler(irq, &mn10300_cpu_pic,
handle_edge_irq);
unit_init_IRQ();
}
/*
* handle normal device IRQs
*/
asmlinkage void do_IRQ(void)
{
unsigned long sp, epsw, irq_disabled_epsw, old_irq_enabled_epsw;
int irq;
sp = current_stack_pointer();
if (sp - (sp & ~(THREAD_SIZE - 1)) < STACK_WARN)
BUG();
/* make sure local_irq_enable() doesn't muck up the interrupt priority
* setting in EPSW */
old_irq_enabled_epsw = __mn10300_irq_enabled_epsw;
local_save_flags(epsw);
__mn10300_irq_enabled_epsw = EPSW_IE | (EPSW_IM & epsw);
irq_disabled_epsw = EPSW_IE | MN10300_CLI_LEVEL;
__IRQ_STAT(smp_processor_id(), __irq_count)++;
irq_enter();
for (;;) {
/* ask the interrupt controller for the next IRQ to process
* - the result we get depends on EPSW.IM
*/
irq = IAGR & IAGR_GN;
if (!irq)
break;
local_irq_restore(irq_disabled_epsw);
generic_handle_irq(irq >> 2);
/* restore IRQ controls for IAGR access */
local_irq_restore(epsw);
}
__mn10300_irq_enabled_epsw = old_irq_enabled_epsw;
irq_exit();
}
/*
* Display interrupt management information through /proc/interrupts
*/
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j, cpu;
struct irqaction *action;
unsigned long flags;
switch (i) {
/* display column title bar naming CPUs */
case 0:
seq_printf(p, " ");
for (j = 0; j < NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "CPU%d ", j);
seq_putc(p, '\n');
break;
/* display information rows, one per active CPU */
case 1 ... NR_IRQS - 1:
spin_lock_irqsave(&irq_desc[i].lock, flags);
action = irq_desc[i].action;
if (action) {
seq_printf(p, "%3d: ", i);
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
seq_printf(p, " %14s.%u", irq_desc[i].chip->name,
(GxICR(i) & GxICR_LEVEL) >>
GxICR_LEVEL_SHIFT);
seq_printf(p, " %s", action->name);
for (action = action->next;
action;
action = action->next)
seq_printf(p, ", %s", action->name);
seq_putc(p, '\n');
}
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
break;
/* polish off with NMI and error counters */
case NR_IRQS:
seq_printf(p, "NMI: ");
for (j = 0; j < NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "%10u ", nmi_count(j));
seq_putc(p, '\n');
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
break;
}
return 0;
}
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