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Commit c3973682 authored by H. Peter Anvin's avatar H. Peter Anvin Committed by Linus Torvalds
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Remove old i386 setup code 

This removes the old i386 setup code.  This is done as a separate patch
to avoid breaking git bisect as some of the i386 code was also used by
the old x86-64 code.
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 91a6c462
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arch/i386/boot/bootsect.S deleted 100644 → 0
View file @ 91a6c462
/*
* bootsect.S Copyright (C) 1991, 1992 Linus Torvalds
*
* modified by Drew Eckhardt
* modified by Bruce Evans (bde)
* modified by Chris Noe (May 1999) (as86 -> gas)
* gutted by H. Peter Anvin (Jan 2003)
*
* BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
* addresses must be multiplied by 16 to obtain their respective linear
* addresses. To avoid confusion, linear addresses are written using leading
* hex while segment addresses are written as segment:offset.
*
*/
#include <asm/boot.h>
SETUPSECTS = 4 /* default nr of setup-sectors */
BOOTSEG = 0x07C0 /* original address of boot-sector */
INITSEG = DEF_INITSEG /* we move boot here - out of the way */
SETUPSEG = DEF_SETUPSEG /* setup starts here */
SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
/* to be loaded */
ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */
#ifndef SVGA_MODE
#define SVGA_MODE ASK_VGA
#endif
#ifndef RAMDISK
#define RAMDISK 0
#endif
#ifndef ROOT_RDONLY
#define ROOT_RDONLY 1
#endif
.code16
.text
.global _start
_start:
# Normalize the start address
jmpl $BOOTSEG, $start2
start2:
movw %cs, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movw $0x7c00, %sp
sti
cld
movw $bugger_off_msg, %si
msg_loop:
lodsb
andb %al, %al
jz die
movb $0xe, %ah
movw $7, %bx
int $0x10
jmp msg_loop
die:
# Allow the user to press a key, then reboot
xorw %ax, %ax
int $0x16
int $0x19
# int 0x19 should never return. In case it does anyway,
# invoke the BIOS reset code...
ljmp $0xf000,$0xfff0
bugger_off_msg:
.ascii "Direct booting from floppy is no longer supported.\r\n"
.ascii "Please use a boot loader program instead.\r\n"
.ascii "\n"
.ascii "Remove disk and press any key to reboot . . .\r\n"
.byte 0
# Kernel attributes; used by setup
.org 497
setup_sects: .byte SETUPSECTS
root_flags: .word ROOT_RDONLY
syssize: .word SYSSIZE
swap_dev: .word SWAP_DEV
ram_size: .word RAMDISK
vid_mode: .word SVGA_MODE
root_dev: .word ROOT_DEV
boot_flag: .word 0xAA55
arch/i386/boot/edd.S deleted 100644 → 0
View file @ 91a6c462
/*
* BIOS Enhanced Disk Drive support
* Copyright (C) 2002, 2003, 2004 Dell, Inc.
* by Matt Domsch <Matt_Domsch@dell.com> October 2002
* conformant to T13 Committee www.t13.org
* projects 1572D, 1484D, 1386D, 1226DT
* disk signature read by Matt Domsch <Matt_Domsch@dell.com>
* and Andrew Wilks <Andrew_Wilks@dell.com> September 2003, June 2004
* legacy CHS retrieval by Patrick J. LoPresti <patl@users.sourceforge.net>
* March 2004
* Command line option parsing, Matt Domsch, November 2004
*/
#include <linux/edd.h>
#include <asm/setup.h>
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
# It is assumed that %ds == INITSEG here
movb $0, (EDD_MBR_SIG_NR_BUF)
movb $0, (EDDNR)
# Check the command line for options:
# edd=of disables EDD completely (edd=off)
# edd=sk skips the MBR test (edd=skipmbr)
# edd=on re-enables EDD (edd=on)
pushl %esi
movw $edd_mbr_sig_start, %di # Default to edd=on
movl %cs:(cmd_line_ptr), %esi
andl %esi, %esi
jz old_cl # Old boot protocol?
# Convert to a real-mode pointer in fs:si
movl %esi, %eax
shrl $4, %eax
movw %ax, %fs
andw $0xf, %si
jmp have_cl_pointer
# Old-style boot protocol?
old_cl:
push %ds # aka INITSEG
pop %fs
cmpw $0xa33f, (0x20)
jne done_cl # No command line at all?
movw (0x22), %si # Pointer relative to INITSEG
# fs:si has the pointer to the command line now
have_cl_pointer:
# Loop through kernel command line one byte at a time. Just in
# case the loader is buggy and failed to null-terminate the command line
# terminate if we get close enough to the end of the segment that we
# cannot fit "edd=XX"...
cl_atspace:
cmpw $-5, %si # Watch for segment wraparound
jae done_cl
movl %fs:(%si), %eax
andb %al, %al # End of line?
jz done_cl
cmpl $EDD_CL_EQUALS, %eax
jz found_edd_equals
cmpb $0x20, %al # <= space consider whitespace
ja cl_skipword
incw %si
jmp cl_atspace
cl_skipword:
cmpw $-5, %si # Watch for segment wraparound
jae done_cl
movb %fs:(%si), %al # End of string?
andb %al, %al
jz done_cl
cmpb $0x20, %al
jbe cl_atspace
incw %si
jmp cl_skipword
found_edd_equals:
# only looking at first two characters after equals
# late overrides early on the command line, so keep going after finding something
movw %fs:4(%si), %ax
cmpw $EDD_CL_OFF, %ax # edd=of
je do_edd_off
cmpw $EDD_CL_SKIP, %ax # edd=sk
je do_edd_skipmbr
cmpw $EDD_CL_ON, %ax # edd=on
je do_edd_on
jmp cl_skipword
do_edd_skipmbr:
movw $edd_start, %di
jmp cl_skipword
do_edd_off:
movw $edd_done, %di
jmp cl_skipword
do_edd_on:
movw $edd_mbr_sig_start, %di
jmp cl_skipword
done_cl:
popl %esi
jmpw *%di
# Read the first sector of each BIOS disk device and store the 4-byte signature
edd_mbr_sig_start:
movb $0x80, %dl # from device 80
movw $EDD_MBR_SIG_BUF, %bx # store buffer ptr in bx
edd_mbr_sig_read:
movl $0xFFFFFFFF, %eax
movl %eax, (%bx) # assume failure
pushw %bx
movb $READ_SECTORS, %ah
movb $1, %al # read 1 sector
movb $0, %dh # at head 0
movw $1, %cx # cylinder 0, sector 0
pushw %es
pushw %ds
popw %es
movw $EDDBUF, %bx # disk's data goes into EDDBUF
pushw %dx # work around buggy BIOSes
stc # work around buggy BIOSes
int $0x13
sti # work around buggy BIOSes
popw %dx
popw %es
popw %bx
jc edd_mbr_sig_done # on failure, we're done.
cmpb $0, %ah # some BIOSes do not set CF
jne edd_mbr_sig_done # on failure, we're done.
movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
movl %eax, (%bx) # store success
incb (EDD_MBR_SIG_NR_BUF) # note that we stored something
incb %dl # increment to next device
addw $4, %bx # increment sig buffer ptr
cmpb $EDD_MBR_SIG_MAX, (EDD_MBR_SIG_NR_BUF) # Out of space?
jb edd_mbr_sig_read # keep looping
edd_mbr_sig_done:
# Do the BIOS Enhanced Disk Drive calls
# This consists of two calls:
# int 13h ah=41h "Check Extensions Present"
# int 13h ah=48h "Get Device Parameters"
# int 13h ah=08h "Legacy Get Device Parameters"
#
# A buffer of size EDDMAXNR*(EDDEXTSIZE+EDDPARMSIZE) is reserved for our use
# in the boot_params at EDDBUF. The first four bytes of which are
# used to store the device number, interface support map and version
# results from fn41. The next four bytes are used to store the legacy
# cylinders, heads, and sectors from fn08. The following 74 bytes are used to
# store the results from fn48. Starting from device 80h, fn41, then fn48
# are called and their results stored in EDDBUF+n*(EDDEXTSIZE+EDDPARMIZE).
# Then the pointer is incremented to store the data for the next call.
# This repeats until either a device doesn't exist, or until EDDMAXNR
# devices have been stored.
# The one tricky part is that ds:si always points EDDEXTSIZE bytes into
# the structure, and the fn41 and fn08 results are stored at offsets
# from there. This removes the need to increment the pointer for
# every store, and leaves it ready for the fn48 call.
# A second one-byte buffer, EDDNR, in the boot_params stores
# the number of BIOS devices which exist, up to EDDMAXNR.
# In setup.c, copy_edd() stores both boot_params buffers away
# for later use, as they would get overwritten otherwise.
# This code is sensitive to the size of the structs in edd.h
edd_start:
# %ds points to the bootsector
# result buffer for fn48
movw $EDDBUF+EDDEXTSIZE, %si # in ds:si, fn41 results
# kept just before that
movb $0x80, %dl # BIOS device 0x80
edd_check_ext:
movb $CHECKEXTENSIONSPRESENT, %ah # Function 41
movw $EDDMAGIC1, %bx # magic
int $0x13 # make the call
jc edd_done # no more BIOS devices
cmpw $EDDMAGIC2, %bx # is magic right?
jne edd_next # nope, next...
movb %dl, %ds:-8(%si) # store device number
movb %ah, %ds:-7(%si) # store version
movw %cx, %ds:-6(%si) # store extensions
incb (EDDNR) # note that we stored something
edd_get_device_params:
movw $EDDPARMSIZE, %ds:(%si) # put size
movw $0x0, %ds:2(%si) # work around buggy BIOSes
movb $GETDEVICEPARAMETERS, %ah # Function 48
int $0x13 # make the call
# Don't check for fail return
# it doesn't matter.
edd_get_legacy_chs:
xorw %ax, %ax
movw %ax, %ds:-4(%si)
movw %ax, %ds:-2(%si)
# Ralf Brown's Interrupt List says to set ES:DI to
# 0000h:0000h "to guard against BIOS bugs"
pushw %es
movw %ax, %es
movw %ax, %di
pushw %dx # legacy call clobbers %dl
movb $LEGACYGETDEVICEPARAMETERS, %ah # Function 08
int $0x13 # make the call
jc edd_legacy_done # failed
movb %cl, %al # Low 6 bits are max
andb $0x3F, %al # sector number
movb %al, %ds:-1(%si) # Record max sect
movb %dh, %ds:-2(%si) # Record max head number
movb %ch, %al # Low 8 bits of max cyl
shr $6, %cl
movb %cl, %ah # High 2 bits of max cyl
movw %ax, %ds:-4(%si)
edd_legacy_done:
popw %dx
popw %es
movw %si, %ax # increment si
addw $EDDPARMSIZE+EDDEXTSIZE, %ax
movw %ax, %si
edd_next:
incb %dl # increment to next device
cmpb $EDDMAXNR, (EDDNR) # Out of space?
jb edd_check_ext # keep looping
edd_done:
#endif
arch/i386/boot/setup.S deleted 100644 → 0
View file @ 91a6c462
/*
* setup.S Copyright (C) 1991, 1992 Linus Torvalds
*
* setup.s is responsible for getting the system data from the BIOS,
* and putting them into the appropriate places in system memory.
* both setup.s and system has been loaded by the bootblock.
*
* This code asks the bios for memory/disk/other parameters, and
* puts them in a "safe" place: 0x90000-0x901FF, ie where the
* boot-block used to be. It is then up to the protected mode
* system to read them from there before the area is overwritten
* for buffer-blocks.
*
* Move PS/2 aux init code to psaux.c
* (troyer@saifr00.cfsat.Honeywell.COM) 03Oct92
*
* some changes and additional features by Christoph Niemann,
* March 1993/June 1994 (Christoph.Niemann@linux.org)
*
* add APM BIOS checking by Stephen Rothwell, May 1994
* (sfr@canb.auug.org.au)
*
* High load stuff, initrd support and position independency
* by Hans Lermen & Werner Almesberger, February 1996
* <lermen@elserv.ffm.fgan.de>, <almesber@lrc.epfl.ch>
*
* Video handling moved to video.S by Martin Mares, March 1996
* <mj@k332.feld.cvut.cz>
*
* Extended memory detection scheme retwiddled by orc@pell.chi.il.us (david
* parsons) to avoid loadlin confusion, July 1997
*
* Transcribed from Intel (as86) -> AT&T (gas) by Chris Noe, May 1999.
* <stiker@northlink.com>
*
* Fix to work around buggy BIOSes which don't use carry bit correctly
* and/or report extended memory in CX/DX for e801h memory size detection
* call. As a result the kernel got wrong figures. The int15/e801h docs
* from Ralf Brown interrupt list seem to indicate AX/BX should be used
* anyway. So to avoid breaking many machines (presumably there was a reason
* to orginally use CX/DX instead of AX/BX), we do a kludge to see
* if CX/DX have been changed in the e801 call and if so use AX/BX .
* Michael Miller, April 2001 <michaelm@mjmm.org>
*
* New A20 code ported from SYSLINUX by H. Peter Anvin. AMD Elan bugfixes
* by Robert Schwebel, December 2001 <robert@schwebel.de>
*/
#include <asm/segment.h>
#include <linux/utsrelease.h>
#include <linux/compile.h>
#include <asm/boot.h>
#include <asm/e820.h>
#include <asm/page.h>
#include <asm/setup.h>
/* Signature words to ensure LILO loaded us right */
#define SIG1 0xAA55
#define SIG2 0x5A5A
INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
# ... and the former contents of CS
DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020
.code16
.globl begtext, begdata, begbss, endtext, enddata, endbss
.text
begtext:
.data
begdata:
.bss
begbss:
.text
start:
jmp trampoline
# This is the setup header, and it must start at %cs:2 (old 0x9020:2)
.ascii "HdrS" # header signature
.word 0x0206 # header version number (>= 0x0105)
# or else old loadlin-1.5 will fail)
realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
start_sys_seg: .word SYSSEG
.word kernel_version # pointing to kernel version string
# above section of header is compatible
# with loadlin-1.5 (header v1.5). Don't
# change it.
type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin,
# Bootlin, SYSLX, bootsect...)
# See Documentation/i386/boot.txt for
# assigned ids
# flags, unused bits must be zero (RFU) bit within loadflags
loadflags:
LOADED_HIGH = 1 # If set, the kernel is loaded high
CAN_USE_HEAP = 0x80 # If set, the loader also has set
# heap_end_ptr to tell how much
# space behind setup.S can be used for
# heap purposes.
# Only the loader knows what is free
#ifndef __BIG_KERNEL__
.byte 0
#else
.byte LOADED_HIGH
#endif
setup_move_size: .word 0x8000 # size to move, when setup is not
# loaded at 0x90000. We will move setup
# to 0x90000 then just before jumping
# into the kernel. However, only the
# loader knows how much data behind
# us also needs to be loaded.
code32_start: # here loaders can put a different
# start address for 32-bit code.
#ifndef __BIG_KERNEL__
.long 0x1000 # 0x1000 = default for zImage
#else
.long 0x100000 # 0x100000 = default for big kernel
#endif
ramdisk_image: .long 0 # address of loaded ramdisk image
# Here the loader puts the 32-bit
# address where it loaded the image.
# This only will be read by the kernel.
ramdisk_size: .long 0 # its size in bytes
bootsect_kludge:
.long 0 # obsolete
heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later)
# space from here (exclusive) down to
# end of setup code can be used by setup
# for local heap purposes.
pad1: .word 0
cmd_line_ptr: .long 0 # (Header version 0x0202 or later)
# If nonzero, a 32-bit pointer
# to the kernel command line.
# The command line should be
# located between the start of
# setup and the end of low
# memory (0xa0000), or it may
# get overwritten before it
# gets read. If this field is
# used, there is no longer
# anything magical about the
# 0x90000 segment; the setup
# can be located anywhere in
# low memory 0x10000 or higher.
ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff
# (Header version 0x0203 or later)
# The highest safe address for
# the contents of an initrd
kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment
#required for protected mode
#kernel
#ifdef CONFIG_RELOCATABLE
relocatable_kernel: .byte 1
#else
relocatable_kernel: .byte 0
#endif
pad2: .byte 0
pad3: .word 0
cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
#added with boot protocol
#version 2.06
trampoline: call start_of_setup
.align 16
# The offset at this point is 0x240
.space (0xeff-0x240+1) # E820 & EDD space (ending at 0xeff)
# End of setup header #####################################################
start_of_setup:
# Bootlin depends on this being done early
movw $0x01500, %ax
movb $0x81, %dl
int $0x13
#ifdef SAFE_RESET_DISK_CONTROLLER
# Reset the disk controller.
movw $0x0000, %ax
movb $0x80, %dl
int $0x13
#endif
# Set %ds = %cs, we know that SETUPSEG = %cs at this point
movw %cs, %ax # aka SETUPSEG
movw %ax, %ds
# Check signature at end of setup
cmpw $SIG1, setup_sig1
jne bad_sig
cmpw $SIG2, setup_sig2
jne bad_sig
jmp good_sig1
# Routine to print asciiz string at ds:si
prtstr:
lodsb
andb %al, %al
jz fin
call prtchr
jmp prtstr
fin: ret
# Space printing
prtsp2: call prtspc # Print double space
prtspc: movb $0x20, %al # Print single space (note: fall-thru)
# Part of above routine, this one just prints ascii al
prtchr: pushw %ax
pushw %cx
movw $7,%bx
movw $0x01, %cx
movb $0x0e, %ah
int $0x10
popw %cx
popw %ax
ret
beep: movb $0x07, %al
jmp prtchr
no_sig_mess: .string "No setup signature found ..."
good_sig1:
jmp good_sig
# We now have to find the rest of the setup code/data
bad_sig:
movw %cs, %ax # SETUPSEG
subw $DELTA_INITSEG, %ax # INITSEG
movw %ax, %ds
xorb %bh, %bh
movb (497), %bl # get setup sect from bootsect
subw $4, %bx # LILO loads 4 sectors of setup
shlw $8, %bx # convert to words (1sect=2^8 words)
movw %bx, %cx
shrw $3, %bx # convert to segment
addw $SYSSEG, %bx
movw %bx, %cs:start_sys_seg
# Move rest of setup code/data to here
movw $2048, %di # four sectors loaded by LILO
subw %si, %si
pushw %cs
popw %es
movw $SYSSEG, %ax
movw %ax, %ds
rep
movsw
movw %cs, %ax # aka SETUPSEG
movw %ax, %ds
cmpw $SIG1, setup_sig1
jne no_sig
cmpw $SIG2, setup_sig2
jne no_sig
jmp good_sig
no_sig:
lea no_sig_mess, %si
call prtstr
no_sig_loop:
hlt
jmp no_sig_loop
good_sig:
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %ds
# Check if an old loader tries to load a big-kernel
testb $LOADED_HIGH, %cs:loadflags # Do we have a big kernel?
jz loader_ok # No, no danger for old loaders.
cmpb $0, %cs:type_of_loader # Do we have a loader that
# can deal with us?
jnz loader_ok # Yes, continue.
pushw %cs # No, we have an old loader,
popw %ds # die.
lea loader_panic_mess, %si
call prtstr
jmp no_sig_loop
loader_panic_mess: .string "Wrong loader, giving up..."
# check minimum cpuid
# we do this here because it is the last place we can actually
# show a user visible error message. Later the video modus
# might be already messed up.
loader_ok:
call verify_cpu
testl %eax,%eax
jz cpu_ok
movw %cs,%ax # aka SETUPSEG
movw %ax,%ds
lea cpu_panic_mess,%si
call prtstr
1: jmp 1b
cpu_panic_mess:
.asciz "PANIC: CPU too old for this kernel."
#include "../kernel/verify_cpu.S"
cpu_ok:
# Get memory size (extended mem, kB)
xorl %eax, %eax
movl %eax, (0x1e0)
#ifndef STANDARD_MEMORY_BIOS_CALL
movb %al, (E820NR)
# Try three different memory detection schemes. First, try
# e820h, which lets us assemble a memory map, then try e801h,
# which returns a 32-bit memory size, and finally 88h, which
# returns 0-64m
# method E820H:
# the memory map from hell. e820h returns memory classified into
# a whole bunch of different types, and allows memory holes and
# everything. We scan through this memory map and build a list
# of the first 32 memory areas, which we return at [E820MAP].
# This is documented at http://www.acpi.info/, in the ACPI 2.0 specification.
#define SMAP 0x534d4150
meme820:
xorl %ebx, %ebx # continuation counter
movw $E820MAP, %di # point into the whitelist
# so we can have the bios
# directly write into it.
jmpe820:
movl $0x0000e820, %eax # e820, upper word zeroed
movl $SMAP, %edx # ascii 'SMAP'
movl $20, %ecx # size of the e820rec
pushw %ds # data record.
popw %es
int $0x15 # make the call
jc bail820 # fall to e801 if it fails
cmpl $SMAP, %eax # check the return is `SMAP'
jne bail820 # fall to e801 if it fails
# cmpl $1, 16(%di) # is this usable memory?
# jne again820
# If this is usable memory, we save it by simply advancing %di by
# sizeof(e820rec).
#
good820:
movb (E820NR), %al # up to 128 entries
cmpb $E820MAX, %al
jae bail820
incb (E820NR)
movw %di, %ax
addw $20, %ax
movw %ax, %di
again820:
cmpl $0, %ebx # check to see if
jne jmpe820 # %ebx is set to EOF
bail820:
# method E801H:
# memory size is in 1k chunksizes, to avoid confusing loadlin.
# we store the 0xe801 memory size in a completely different place,
# because it will most likely be longer than 16 bits.
# (use 1e0 because that's what Larry Augustine uses in his
# alternative new memory detection scheme, and it's sensible
# to write everything into the same place.)
meme801:
stc # fix to work around buggy
xorw %cx,%cx # BIOSes which don't clear/set
xorw %dx,%dx # carry on pass/error of
# e801h memory size call
# or merely pass cx,dx though
# without changing them.
movw $0xe801, %ax
int $0x15
jc mem88
cmpw $0x0, %cx # Kludge to handle BIOSes
jne e801usecxdx # which report their extended
cmpw $0x0, %dx # memory in AX/BX rather than
jne e801usecxdx # CX/DX. The spec I have read
movw %ax, %cx # seems to indicate AX/BX
movw %bx, %dx # are more reasonable anyway...
e801usecxdx:
andl $0xffff, %edx # clear sign extend
shll $6, %edx # and go from 64k to 1k chunks
movl %edx, (0x1e0) # store extended memory size
andl $0xffff, %ecx # clear sign extend
addl %ecx, (0x1e0) # and add lower memory into
# total size.
# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or
# 64mb, depending on the bios) in ax.
mem88:
#endif
movb $0x88, %ah
int $0x15
movw %ax, (2)
# Set the keyboard repeat rate to the max
movw $0x0305, %ax
xorw %bx, %bx
int $0x16
# Check for video adapter and its parameters and allow the
# user to browse video modes.
call video # NOTE: we need %ds pointing
# to bootsector
# Get hd0 data...
xorw %ax, %ax
movw %ax, %ds
ldsw (4 * 0x41), %si
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
pushw %ax
movw %ax, %es
movw $0x0080, %di
movw $0x10, %cx
pushw %cx
cld
rep
movsb
# Get hd1 data...
xorw %ax, %ax
movw %ax, %ds
ldsw (4 * 0x46), %si
popw %cx
popw %es
movw $0x0090, %di
rep
movsb
# Check that there IS a hd1 :-)
movw $0x01500, %ax
movb $0x81, %dl
int $0x13
jc no_disk1
cmpb $3, %ah
je is_disk1
no_disk1:
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %es
movw $0x0090, %di
movw $0x10, %cx
xorw %ax, %ax
cld
rep
stosb
is_disk1:
# check for Micro Channel (MCA) bus
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %ds
xorw %ax, %ax
movw %ax, (0xa0) # set table length to 0
movb $0xc0, %ah
stc
int $0x15 # moves feature table to es:bx
jc no_mca
pushw %ds
movw %es, %ax
movw %ax, %ds
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %es
movw %bx, %si
movw $0xa0, %di
movw (%si), %cx
addw $2, %cx # table length is a short
cmpw $0x10, %cx
jc sysdesc_ok
movw $0x10, %cx # we keep only first 16 bytes
sysdesc_ok:
rep
movsb
popw %ds
no_mca:
#ifdef CONFIG_X86_VOYAGER
movb $0xff, 0x40 # flag on config found
movb $0xc0, %al
mov $0xff, %ah
int $0x15 # put voyager config info at es:di
jc no_voyager
movw $0x40, %si # place voyager info in apm table
cld
movw $7, %cx
voyager_rep:
movb %es:(%di), %al
movb %al,(%si)
incw %di
incw %si
decw %cx
jnz voyager_rep
no_voyager:
#endif
# Check for PS/2 pointing device
movw %cs, %ax # aka SETUPSEG
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ax, %ds
movb $0, (0x1ff) # default is no pointing device
int $0x11 # int 0x11: equipment list
testb $0x04, %al # check if mouse installed
jz no_psmouse
movb $0xAA, (0x1ff) # device present
no_psmouse:
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
movl $0x0000E980, %eax # IST Support
movl $0x47534943, %edx # Request value
int $0x15
movl %eax, (96)
movl %ebx, (100)
movl %ecx, (104)
movl %edx, (108)
#endif
#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
# Then check for an APM BIOS...
# %ds points to the bootsector
movw $0, 0x40 # version = 0 means no APM BIOS
movw $0x05300, %ax # APM BIOS installation check
xorw %bx, %bx
int $0x15
jc done_apm_bios # Nope, no APM BIOS
cmpw $0x0504d, %bx # Check for "PM" signature
jne done_apm_bios # No signature, no APM BIOS
andw $0x02, %cx # Is 32 bit supported?
je done_apm_bios # No 32-bit, no (good) APM BIOS
movw $0x05304, %ax # Disconnect first just in case
xorw %bx, %bx
int $0x15 # ignore return code
movw $0x05303, %ax # 32 bit connect
xorl %ebx, %ebx
xorw %cx, %cx # paranoia :-)
xorw %dx, %dx # ...
xorl %esi, %esi # ...
xorw %di, %di # ...
int $0x15
jc no_32_apm_bios # Ack, error.
movw %ax, (66) # BIOS code segment
movl %ebx, (68) # BIOS entry point offset
movw %cx, (72) # BIOS 16 bit code segment
movw %dx, (74) # BIOS data segment
movl %esi, (78) # BIOS code segment lengths
movw %di, (82) # BIOS data segment length
# Redo the installation check as the 32 bit connect
# modifies the flags returned on some BIOSs
movw $0x05300, %ax # APM BIOS installation check
xorw %bx, %bx
xorw %cx, %cx # paranoia
int $0x15
jc apm_disconnect # error -> shouldn't happen
cmpw $0x0504d, %bx # check for "PM" signature
jne apm_disconnect # no sig -> shouldn't happen
movw %ax, (64) # record the APM BIOS version
movw %cx, (76) # and flags
jmp done_apm_bios
apm_disconnect: # Tidy up
movw $0x05304, %ax # Disconnect
xorw %bx, %bx
int $0x15 # ignore return code
jmp done_apm_bios
no_32_apm_bios:
andw $0xfffd, (76) # remove 32 bit support bit
done_apm_bios:
#endif
#include "edd.S"
# Now we want to move to protected mode ...
cmpw $0, %cs:realmode_swtch
jz rmodeswtch_normal
lcall *%cs:realmode_swtch
jmp rmodeswtch_end
rmodeswtch_normal:
pushw %cs
call default_switch
rmodeswtch_end:
# Now we move the system to its rightful place ... but we check if we have a
# big-kernel. In that case we *must* not move it ...
testb $LOADED_HIGH, %cs:loadflags
jz do_move0 # .. then we have a normal low
# loaded zImage
# .. or else we have a high
# loaded bzImage
jmp end_move # ... and we skip moving
do_move0:
movw $0x100, %ax # start of destination segment
movw %cs, %bp # aka SETUPSEG
subw $DELTA_INITSEG, %bp # aka INITSEG
movw %cs:start_sys_seg, %bx # start of source segment
cld
do_move:
movw %ax, %es # destination segment
incb %ah # instead of add ax,#0x100
movw %bx, %ds # source segment
addw $0x100, %bx
subw %di, %di
subw %si, %si
movw $0x800, %cx
rep
movsw
cmpw %bp, %bx # assume start_sys_seg > 0x200,
# so we will perhaps read one
# page more than needed, but
# never overwrite INITSEG
# because destination is a
# minimum one page below source
jb do_move
end_move:
# then we load the segment descriptors
movw %cs, %ax # aka SETUPSEG
movw %ax, %ds
# Check whether we need to be downward compatible with version <=201
cmpl $0, cmd_line_ptr
jne end_move_self # loader uses version >=202 features
cmpb $0x20, type_of_loader
je end_move_self # bootsect loader, we know of it
# Boot loader doesnt support boot protocol version 2.02.
# If we have our code not at 0x90000, we need to move it there now.
# We also then need to move the params behind it (commandline)
# Because we would overwrite the code on the current IP, we move
# it in two steps, jumping high after the first one.
movw %cs, %ax
cmpw $SETUPSEG, %ax
je end_move_self
cli # make sure we really have
# interrupts disabled !
# because after this the stack
# should not be used
subw $DELTA_INITSEG, %ax # aka INITSEG
movw %ss, %dx
cmpw %ax, %dx
jb move_self_1
addw $INITSEG, %dx
subw %ax, %dx # this will go into %ss after
# the move
move_self_1:
movw %ax, %ds
movw $INITSEG, %ax # real INITSEG
movw %ax, %es
movw %cs:setup_move_size, %cx
std # we have to move up, so we use
# direction down because the
# areas may overlap
movw %cx, %di
decw %di
movw %di, %si
subw $move_self_here+0x200, %cx
rep
movsb
ljmp $SETUPSEG, $move_self_here
move_self_here:
movw $move_self_here+0x200, %cx
rep
movsb
movw $SETUPSEG, %ax
movw %ax, %ds
movw %dx, %ss
end_move_self: # now we are at the right place
#
# Enable A20. This is at the very best an annoying procedure.
# A20 code ported from SYSLINUX 1.52-1.63 by H. Peter Anvin.
# AMD Elan bug fix by Robert Schwebel.
#
#if defined(CONFIG_X86_ELAN)
movb $0x02, %al # alternate A20 gate
outb %al, $0x92 # this works on SC410/SC520
a20_elan_wait:
call a20_test
jz a20_elan_wait
jmp a20_done
#endif
A20_TEST_LOOPS = 32 # Iterations per wait
A20_ENABLE_LOOPS = 255 # Total loops to try
#ifndef CONFIG_X86_VOYAGER
a20_try_loop:
# First, see if we are on a system with no A20 gate.
a20_none:
call a20_test
jnz a20_done
# Next, try the BIOS (INT 0x15, AX=0x2401)
a20_bios:
movw $0x2401, %ax
pushfl # Be paranoid about flags
int $0x15
popfl
call a20_test
jnz a20_done
# Try enabling A20 through the keyboard controller
#endif /* CONFIG_X86_VOYAGER */
a20_kbc:
call empty_8042
#ifndef CONFIG_X86_VOYAGER
call a20_test # Just in case the BIOS worked
jnz a20_done # but had a delayed reaction.
#endif
movb $0xD1, %al # command write
outb %al, $0x64
call empty_8042
movb $0xDF, %al # A20 on
outb %al, $0x60
call empty_8042
#ifndef CONFIG_X86_VOYAGER
# Wait until a20 really *is* enabled; it can take a fair amount of
# time on certain systems; Toshiba Tecras are known to have this
# problem.
a20_kbc_wait:
xorw %cx, %cx
a20_kbc_wait_loop:
call a20_test
jnz a20_done
loop a20_kbc_wait_loop
# Final attempt: use "configuration port A"
a20_fast:
inb $0x92, %al # Configuration Port A
orb $0x02, %al # "fast A20" version
andb $0xFE, %al # don't accidentally reset
outb %al, $0x92
# Wait for configuration port A to take effect
a20_fast_wait:
xorw %cx, %cx
a20_fast_wait_loop:
call a20_test
jnz a20_done
loop a20_fast_wait_loop
# A20 is still not responding. Try frobbing it again.
#
decb (a20_tries)
jnz a20_try_loop
movw $a20_err_msg, %si
call prtstr
a20_die:
hlt
jmp a20_die
a20_tries:
.byte A20_ENABLE_LOOPS
a20_err_msg:
.ascii "linux: fatal error: A20 gate not responding!"
.byte 13, 10, 0
# If we get here, all is good
a20_done:
#endif /* CONFIG_X86_VOYAGER */
# set up gdt and idt and 32bit start address
lidt idt_48 # load idt with 0,0
xorl %eax, %eax # Compute gdt_base
movw %ds, %ax # (Convert %ds:gdt to a linear ptr)
shll $4, %eax
addl %eax, code32
addl $gdt, %eax
movl %eax, (gdt_48+2)
lgdt gdt_48 # load gdt with whatever is
# appropriate
# make sure any possible coprocessor is properly reset..
xorw %ax, %ax
outb %al, $0xf0
call delay
outb %al, $0xf1
call delay
# well, that went ok, I hope. Now we mask all interrupts - the rest
# is done in init_IRQ().
movb $0xFF, %al # mask all interrupts for now
outb %al, $0xA1
call delay
movb $0xFB, %al # mask all irq's but irq2 which
outb %al, $0x21 # is cascaded
# Well, that certainly wasn't fun :-(. Hopefully it works, and we don't
# need no steenking BIOS anyway (except for the initial loading :-).
# The BIOS-routine wants lots of unnecessary data, and it's less
# "interesting" anyway. This is how REAL programmers do it.
#
# Well, now's the time to actually move into protected mode. To make
# things as simple as possible, we do no register set-up or anything,
# we let the gnu-compiled 32-bit programs do that. We just jump to
# absolute address 0x1000 (or the loader supplied one),
# in 32-bit protected mode.
#
# Note that the short jump isn't strictly needed, although there are
# reasons why it might be a good idea. It won't hurt in any case.
movw $1, %ax # protected mode (PE) bit
lmsw %ax # This is it!
jmp flush_instr
flush_instr:
xorw %bx, %bx # Flag to indicate a boot
xorl %esi, %esi # Pointer to real-mode code
movw %cs, %si
subw $DELTA_INITSEG, %si
shll $4, %esi # Convert to 32-bit pointer
# jump to startup_32 in arch/i386/boot/compressed/head.S
#
# NOTE: For high loaded big kernels we need a
# jmpi 0x100000,__BOOT_CS
#
# but we yet haven't reloaded the CS register, so the default size
# of the target offset still is 16 bit.
# However, using an operand prefix (0x66), the CPU will properly
# take our 48 bit far pointer. (INTeL 80386 Programmer's Reference
# Manual, Mixing 16-bit and 32-bit code, page 16-6)
.byte 0x66, 0xea # prefix + jmpi-opcode
code32: .long startup_32 # will be set to %cs+startup_32
.word __BOOT_CS
.code32
startup_32:
movl $(__BOOT_DS), %eax
movl %eax, %ds
movl %eax, %es
movl %eax, %fs
movl %eax, %gs
movl %eax, %ss
xorl %eax, %eax
1: incl %eax # check that A20 really IS enabled
movl %eax, 0x00000000 # loop forever if it isn't
cmpl %eax, 0x00100000
je 1b
# Jump to the 32bit entry point
jmpl *(code32_start - start + (DELTA_INITSEG << 4))(%esi)
.code16
# Here's a bunch of information about your current kernel..
kernel_version: .ascii UTS_RELEASE
.ascii " ("
.ascii LINUX_COMPILE_BY
.ascii "@"
.ascii LINUX_COMPILE_HOST
.ascii ") "
.ascii UTS_VERSION
.byte 0
# This is the default real mode switch routine.
# to be called just before protected mode transition
default_switch:
cli # no interrupts allowed !
movb $0x80, %al # disable NMI for bootup
# sequence
outb %al, $0x70
lret
#ifndef CONFIG_X86_VOYAGER
# This routine tests whether or not A20 is enabled. If so, it
# exits with zf = 0.
#
# The memory address used, 0x200, is the int $0x80 vector, which
# should be safe.
A20_TEST_ADDR = 4*0x80
a20_test:
pushw %cx
pushw %ax
xorw %cx, %cx
movw %cx, %fs # Low memory
decw %cx
movw %cx, %gs # High memory area
movw $A20_TEST_LOOPS, %cx
movw %fs:(A20_TEST_ADDR), %ax
pushw %ax
a20_test_wait:
incw %ax
movw %ax, %fs:(A20_TEST_ADDR)
call delay # Serialize and make delay constant
cmpw %gs:(A20_TEST_ADDR+0x10), %ax
loope a20_test_wait
popw %fs:(A20_TEST_ADDR)
popw %ax
popw %cx
ret
#endif /* CONFIG_X86_VOYAGER */
# This routine checks that the keyboard command queue is empty
# (after emptying the output buffers)
#
# Some machines have delusions that the keyboard buffer is always full
# with no keyboard attached...
#
# If there is no keyboard controller, we will usually get 0xff
# to all the reads. With each IO taking a microsecond and
# a timeout of 100,000 iterations, this can take about half a
# second ("delay" == outb to port 0x80). That should be ok,
# and should also be plenty of time for a real keyboard controller
# to empty.
#
empty_8042:
pushl %ecx
movl $100000, %ecx
empty_8042_loop:
decl %ecx
jz empty_8042_end_loop
call delay
inb $0x64, %al # 8042 status port
testb $1, %al # output buffer?
jz no_output
call delay
inb $0x60, %al # read it
jmp empty_8042_loop
no_output:
testb $2, %al # is input buffer full?
jnz empty_8042_loop # yes - loop
empty_8042_end_loop:
popl %ecx
ret
# Read the cmos clock. Return the seconds in al
gettime:
pushw %cx
movb $0x02, %ah
int $0x1a
movb %dh, %al # %dh contains the seconds
andb $0x0f, %al
movb %dh, %ah
movb $0x04, %cl
shrb %cl, %ah
aad
popw %cx
ret
# Delay is needed after doing I/O
delay:
outb %al,$0x80
ret
# Descriptor tables
#
# NOTE: The intel manual says gdt should be sixteen bytes aligned for
# efficiency reasons. However, there are machines which are known not
# to boot with misaligned GDTs, so alter this at your peril! If you alter
# GDT_ENTRY_BOOT_CS (in asm/segment.h) remember to leave at least two
# empty GDT entries (one for NULL and one reserved).
#
# NOTE: On some CPUs, the GDT must be 8 byte aligned. This is
# true for the Voyager Quad CPU card which will not boot without
# This directive. 16 byte aligment is recommended by intel.
#
.align 16
gdt:
.fill GDT_ENTRY_BOOT_CS,8,0
.word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
.word 0 # base address = 0
.word 0x9A00 # code read/exec
.word 0x00CF # granularity = 4096, 386
# (+5th nibble of limit)
.word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
.word 0 # base address = 0
.word 0x9200 # data read/write
.word 0x00CF # granularity = 4096, 386
# (+5th nibble of limit)
gdt_end:
.align 4
.word 0 # alignment byte
idt_48:
.word 0 # idt limit = 0
.word 0, 0 # idt base = 0L
.word 0 # alignment byte
gdt_48:
.word gdt_end - gdt - 1 # gdt limit
.word 0, 0 # gdt base (filled in later)
# Include video setup & detection code
#include "video.S"
# Setup signature -- must be last
setup_sig1: .word SIG1
setup_sig2: .word SIG2
# After this point, there is some free space which is used by the video mode
# handling code to store the temporary mode table (not used by the kernel).
modelist:
.text
endtext:
.data
enddata:
.bss
endbss:
arch/i386/boot/video.S deleted 100644 → 0
View file @ 91a6c462
/* video.S
*
* Display adapter & video mode setup, version 2.13 (14-May-99)
*
* Copyright (C) 1995 -- 1998 Martin Mares <mj@ucw.cz>
* Based on the original setup.S code (C) Linus Torvalds and Mats Anderson
*
* Rewritten to use GNU 'as' by Chris Noe <stiker@northlink.com> May 1999
*
* For further information, look at Documentation/svga.txt.
*
*/
/* Enable autodetection of SVGA adapters and modes. */
#undef CONFIG_VIDEO_SVGA
/* Enable autodetection of VESA modes */
#define CONFIG_VIDEO_VESA
/* Enable compacting of mode table */
#define CONFIG_VIDEO_COMPACT
/* Retain screen contents when switching modes */
#define CONFIG_VIDEO_RETAIN
/* Enable local mode list */
#undef CONFIG_VIDEO_LOCAL
/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
#undef CONFIG_VIDEO_400_HACK
/* Hack that lets you force specific BIOS mode ID and specific dimensions */
#undef CONFIG_VIDEO_GFX_HACK
#define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */
#define VIDEO_GFX_BIOS_BX 0x0102
#define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */
/* This code uses an extended set of video mode numbers. These include:
* Aliases for standard modes
* NORMAL_VGA (-1)
* EXTENDED_VGA (-2)
* ASK_VGA (-3)
* Video modes numbered by menu position -- NOT RECOMMENDED because of lack
* of compatibility when extending the table. These are between 0x00 and 0xff.
*/
#define VIDEO_FIRST_MENU 0x0000
/* Standard BIOS video modes (BIOS number + 0x0100) */
#define VIDEO_FIRST_BIOS 0x0100
/* VESA BIOS video modes (VESA number + 0x0200) */
#define VIDEO_FIRST_VESA 0x0200
/* Video7 special modes (BIOS number + 0x0900) */
#define VIDEO_FIRST_V7 0x0900
/* Special video modes */
#define VIDEO_FIRST_SPECIAL 0x0f00
#define VIDEO_80x25 0x0f00
#define VIDEO_8POINT 0x0f01
#define VIDEO_80x43 0x0f02
#define VIDEO_80x28 0x0f03
#define VIDEO_CURRENT_MODE 0x0f04
#define VIDEO_80x30 0x0f05
#define VIDEO_80x34 0x0f06
#define VIDEO_80x60 0x0f07
#define VIDEO_GFX_HACK 0x0f08
#define VIDEO_LAST_SPECIAL 0x0f09
/* Video modes given by resolution */
#define VIDEO_FIRST_RESOLUTION 0x1000
/* The "recalculate timings" flag */
#define VIDEO_RECALC 0x8000
/* Positions of various video parameters passed to the kernel */
/* (see also include/linux/tty.h) */
#define PARAM_CURSOR_POS 0x00
#define PARAM_VIDEO_PAGE 0x04
#define PARAM_VIDEO_MODE 0x06
#define PARAM_VIDEO_COLS 0x07
#define PARAM_VIDEO_EGA_BX 0x0a
#define PARAM_VIDEO_LINES 0x0e
#define PARAM_HAVE_VGA 0x0f
#define PARAM_FONT_POINTS 0x10
#define PARAM_LFB_WIDTH 0x12
#define PARAM_LFB_HEIGHT 0x14
#define PARAM_LFB_DEPTH 0x16
#define PARAM_LFB_BASE 0x18
#define PARAM_LFB_SIZE 0x1c
#define PARAM_LFB_LINELENGTH 0x24
#define PARAM_LFB_COLORS 0x26
#define PARAM_VESAPM_SEG 0x2e
#define PARAM_VESAPM_OFF 0x30
#define PARAM_LFB_PAGES 0x32
#define PARAM_VESA_ATTRIB 0x34
#define PARAM_CAPABILITIES 0x36
/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
#ifdef CONFIG_VIDEO_RETAIN
#define DO_STORE call store_screen
#else
#define DO_STORE
#endif /* CONFIG_VIDEO_RETAIN */
# This is the main entry point called by setup.S
# %ds *must* be pointing to the bootsector
video: pushw %ds # We use different segments
pushw %ds # FS contains original DS
popw %fs
pushw %cs # DS is equal to CS
popw %ds
pushw %cs # ES is equal to CS
popw %es
xorw %ax, %ax
movw %ax, %gs # GS is zero
cld
call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
#ifdef CONFIG_VIDEO_SELECT
movw %fs:(0x01fa), %ax # User selected video mode
cmpw $ASK_VGA, %ax # Bring up the menu
jz vid2
call mode_set # Set the mode
jc vid1
leaw badmdt, %si # Invalid mode ID
call prtstr
vid2: call mode_menu
vid1:
#ifdef CONFIG_VIDEO_RETAIN
call restore_screen # Restore screen contents
#endif /* CONFIG_VIDEO_RETAIN */
call store_edid
#endif /* CONFIG_VIDEO_SELECT */
call mode_params # Store mode parameters
popw %ds # Restore original DS
ret
# Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
basic_detect:
movb $0, %fs:(PARAM_HAVE_VGA)
movb $0x12, %ah # Check EGA/VGA
movb $0x10, %bl
int $0x10
movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel
cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card.
je basret
incb adapter
movw $0x1a00, %ax # Check EGA or VGA?
int $0x10
cmpb $0x1a, %al # 1a means VGA...
jne basret # anything else is EGA.
incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA
incb adapter
basret: ret
# Store the video mode parameters for later usage by the kernel.
# This is done by asking the BIOS except for the rows/columns
# parameters in the default 80x25 mode -- these are set directly,
# because some very obscure BIOSes supply insane values.
mode_params:
#ifdef CONFIG_VIDEO_SELECT
cmpb $0, graphic_mode
jnz mopar_gr
#endif
movb $0x03, %ah # Read cursor position
xorb %bh, %bh
int $0x10
movw %dx, %fs:(PARAM_CURSOR_POS)
movb $0x0f, %ah # Read page/mode/width
int $0x10
movw %bx, %fs:(PARAM_VIDEO_PAGE)
movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width
cmpb $0x7, %al # MDA/HGA => segment differs
jnz mopar0
movw $0xb000, video_segment
mopar0: movw %gs:(0x485), %ax # Font size
movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
movw force_size, %ax # Forced size?
orw %ax, %ax
jz mopar1
movb %ah, %fs:(PARAM_VIDEO_COLS)
movb %al, %fs:(PARAM_VIDEO_LINES)
ret
mopar1: movb $25, %al
cmpb $0, adapter # If we are on CGA/MDA/HGA, the
jz mopar2 # screen must have 25 lines.
movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
incb %al # location of max lines.
mopar2: movb %al, %fs:(PARAM_VIDEO_LINES)
ret
#ifdef CONFIG_VIDEO_SELECT
# Fetching of VESA frame buffer parameters
mopar_gr:
leaw modelist+1024, %di
movb $0x23, %fs:(PARAM_HAVE_VGA)
movw 16(%di), %ax
movw %ax, %fs:(PARAM_LFB_LINELENGTH)
movw 18(%di), %ax
movw %ax, %fs:(PARAM_LFB_WIDTH)
movw 20(%di), %ax
movw %ax, %fs:(PARAM_LFB_HEIGHT)
movb 25(%di), %al
movb $0, %ah
movw %ax, %fs:(PARAM_LFB_DEPTH)
movb 29(%di), %al
movb $0, %ah
movw %ax, %fs:(PARAM_LFB_PAGES)
movl 40(%di), %eax
movl %eax, %fs:(PARAM_LFB_BASE)
movl 31(%di), %eax
movl %eax, %fs:(PARAM_LFB_COLORS)
movl 35(%di), %eax
movl %eax, %fs:(PARAM_LFB_COLORS+4)
movw 0(%di), %ax
movw %ax, %fs:(PARAM_VESA_ATTRIB)
# get video mem size
leaw modelist+1024, %di
movw $0x4f00, %ax
int $0x10
xorl %eax, %eax
movw 18(%di), %ax
movl %eax, %fs:(PARAM_LFB_SIZE)
# store mode capabilities
movl 10(%di), %eax
movl %eax, %fs:(PARAM_CAPABILITIES)
# switching the DAC to 8-bit is for <= 8 bpp only
movw %fs:(PARAM_LFB_DEPTH), %ax
cmpw $8, %ax
jg dac_done
# get DAC switching capability
xorl %eax, %eax
movb 10(%di), %al
testb $1, %al
jz dac_set
# attempt to switch DAC to 8-bit
movw $0x4f08, %ax
movw $0x0800, %bx
int $0x10
cmpw $0x004f, %ax
jne dac_set
movb %bh, dac_size # store actual DAC size
dac_set:
# set color size to DAC size
movb dac_size, %al
movb %al, %fs:(PARAM_LFB_COLORS+0)
movb %al, %fs:(PARAM_LFB_COLORS+2)
movb %al, %fs:(PARAM_LFB_COLORS+4)
movb %al, %fs:(PARAM_LFB_COLORS+6)
# set color offsets to 0
movb $0, %fs:(PARAM_LFB_COLORS+1)
movb $0, %fs:(PARAM_LFB_COLORS+3)
movb $0, %fs:(PARAM_LFB_COLORS+5)
movb $0, %fs:(PARAM_LFB_COLORS+7)
dac_done:
# get protected mode interface informations
movw $0x4f0a, %ax
xorw %bx, %bx
xorw %di, %di
int $0x10
cmp $0x004f, %ax
jnz no_pm
movw %es, %fs:(PARAM_VESAPM_SEG)
movw %di, %fs:(PARAM_VESAPM_OFF)
no_pm: ret
# The video mode menu
mode_menu:
leaw keymsg, %si # "Return/Space/Timeout" message
call prtstr
call flush
nokey: call getkt
cmpb $0x0d, %al # ENTER ?
je listm # yes - manual mode selection
cmpb $0x20, %al # SPACE ?
je defmd1 # no - repeat
call beep
jmp nokey
defmd1: ret # No mode chosen? Default 80x25
listm: call mode_table # List mode table
listm0: leaw name_bann, %si # Print adapter name
call prtstr
movw card_name, %si
orw %si, %si
jnz an2
movb adapter, %al
leaw old_name, %si
orb %al, %al
jz an1
leaw ega_name, %si
decb %al
jz an1
leaw vga_name, %si
jmp an1
an2: call prtstr
leaw svga_name, %si
an1: call prtstr
leaw listhdr, %si # Table header
call prtstr
movb $0x30, %dl # DL holds mode number
leaw modelist, %si
lm1: cmpw $ASK_VGA, (%si) # End?
jz lm2
movb %dl, %al # Menu selection number
call prtchr
call prtsp2
lodsw
call prthw # Mode ID
call prtsp2
movb 0x1(%si), %al
call prtdec # Rows
movb $0x78, %al # the letter 'x'
call prtchr
lodsw
call prtdec # Columns
movb $0x0d, %al # New line
call prtchr
movb $0x0a, %al
call prtchr
incb %dl # Next character
cmpb $0x3a, %dl
jnz lm1
movb $0x61, %dl
jmp lm1
lm2: leaw prompt, %si # Mode prompt
call prtstr
leaw edit_buf, %di # Editor buffer
lm3: call getkey
cmpb $0x0d, %al # Enter?
jz lment
cmpb $0x08, %al # Backspace?
jz lmbs
cmpb $0x20, %al # Printable?
jc lm3
cmpw $edit_buf+4, %di # Enough space?
jz lm3
stosb
call prtchr
jmp lm3
lmbs: cmpw $edit_buf, %di # Backspace
jz lm3
decw %di
movb $0x08, %al
call prtchr
call prtspc
movb $0x08, %al
call prtchr
jmp lm3
lment: movb $0, (%di)
leaw crlft, %si
call prtstr
leaw edit_buf, %si
cmpb $0, (%si) # Empty string = default mode
jz lmdef
cmpb $0, 1(%si) # One character = menu selection
jz mnusel
cmpw $0x6373, (%si) # "scan" => mode scanning
jnz lmhx
cmpw $0x6e61, 2(%si)
jz lmscan
lmhx: xorw %bx, %bx # Else => mode ID in hex
lmhex: lodsb
orb %al, %al
jz lmuse1
subb $0x30, %al
jc lmbad
cmpb $10, %al
jc lmhx1
subb $7, %al
andb $0xdf, %al
cmpb $10, %al
jc lmbad
cmpb $16, %al
jnc lmbad
lmhx1: shlw $4, %bx
orb %al, %bl
jmp lmhex
lmuse1: movw %bx, %ax
jmp lmuse
mnusel: lodsb # Menu selection
xorb %ah, %ah
subb $0x30, %al
jc lmbad
cmpb $10, %al
jc lmuse
cmpb $0x61-0x30, %al
jc lmbad
subb $0x61-0x30-10, %al
cmpb $36, %al
jnc lmbad
lmuse: call mode_set
jc lmdef
lmbad: leaw unknt, %si
call prtstr
jmp lm2
lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
jz lmbad
movw $0, mt_end # Scanning of modes is
movb $1, scanning # done as new autodetection.
call mode_table
jmp listm0
lmdef: ret
# Additional parts of mode_set... (relative jumps, you know)
setv7: # Video7 extended modes
DO_STORE
subb $VIDEO_FIRST_V7>>8, %bh
movw $0x6f05, %ax
int $0x10
stc
ret
_setrec: jmp setrec # Ugly...
_set_80x25: jmp set_80x25
# Aliases for backward compatibility.
setalias:
movw $VIDEO_80x25, %ax
incw %bx
jz mode_set
movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
incw %bx
jnz setbad # Fall-through!
# Setting of user mode (AX=mode ID) => CF=success
mode_set:
movw %ax, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S
movw %ax, %bx
cmpb $0xff, %ah
jz setalias
testb $VIDEO_RECALC>>8, %ah
jnz _setrec
cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
jnc setres
cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
jz setspc
cmpb $VIDEO_FIRST_V7>>8, %ah
jz setv7
cmpb $VIDEO_FIRST_VESA>>8, %ah
jnc check_vesa
orb %ah, %ah
jz setmenu
decb %ah
jz setbios
setbad: clc
movb $0, do_restore # The screen needn't be restored
ret
setvesa:
DO_STORE
subb $VIDEO_FIRST_VESA>>8, %bh
movw $0x4f02, %ax # VESA BIOS mode set call
int $0x10
cmpw $0x004f, %ax # AL=4f if implemented
jnz setbad # AH=0 if OK
stc
ret
setbios:
DO_STORE
int $0x10 # Standard BIOS mode set call
pushw %bx
movb $0x0f, %ah # Check if really set
int $0x10
popw %bx
cmpb %bl, %al
jnz setbad
stc
ret
setspc: xorb %bh, %bh # Set special mode
cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
jnc setbad
addw %bx, %bx
jmp *spec_inits(%bx)
setmenu:
orb %al, %al # 80x25 is an exception
jz _set_80x25
pushw %bx # Set mode chosen from menu
call mode_table # Build the mode table
popw %ax
shlw $2, %ax
addw %ax, %si
cmpw %di, %si
jnc setbad
movw (%si), %ax # Fetch mode ID
_m_s: jmp mode_set
setres: pushw %bx # Set mode chosen by resolution
call mode_table
popw %bx
xchgb %bl, %bh
setr1: lodsw
cmpw $ASK_VGA, %ax # End of the list?
jz setbad
lodsw
cmpw %bx, %ax
jnz setr1
movw -4(%si), %ax # Fetch mode ID
jmp _m_s
check_vesa:
#ifdef CONFIG_FIRMWARE_EDID
leaw modelist+1024, %di
movw $0x4f00, %ax
int $0x10
cmpw $0x004f, %ax
jnz setbad
movw 4(%di), %ax
movw %ax, vbe_version
#endif
leaw modelist+1024, %di
subb $VIDEO_FIRST_VESA>>8, %bh
movw %bx, %cx # Get mode information structure
movw $0x4f01, %ax
int $0x10
addb $VIDEO_FIRST_VESA>>8, %bh
cmpw $0x004f, %ax
jnz setbad
movb (%di), %al # Check capabilities.
andb $0x19, %al
cmpb $0x09, %al
jz setvesa # This is a text mode
movb (%di), %al # Check capabilities.
andb $0x99, %al
cmpb $0x99, %al
jnz _setbad # Doh! No linear frame buffer.
subb $VIDEO_FIRST_VESA>>8, %bh
orw $0x4000, %bx # Use linear frame buffer
movw $0x4f02, %ax # VESA BIOS mode set call
int $0x10
cmpw $0x004f, %ax # AL=4f if implemented
jnz _setbad # AH=0 if OK
movb $1, graphic_mode # flag graphic mode
movb $0, do_restore # no screen restore
stc
ret
_setbad: jmp setbad # Ugly...
# Recalculate vertical display end registers -- this fixes various
# inconsistencies of extended modes on many adapters. Called when
# the VIDEO_RECALC flag is set in the mode ID.
setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
call mode_set
jnc rct3
movw %gs:(0x485), %ax # Font size in pixels
movb %gs:(0x484), %bl # Number of rows
incb %bl
mulb %bl # Number of visible
decw %ax # scan lines - 1
movw $0x3d4, %dx
movw %ax, %bx
movb $0x12, %al # Lower 8 bits
movb %bl, %ah
outw %ax, %dx
movb $0x07, %al # Bits 8 and 9 in the overflow register
call inidx
xchgb %al, %ah
andb $0xbd, %ah
shrb %bh
jnc rct1
orb $0x02, %ah
rct1: shrb %bh
jnc rct2
orb $0x40, %ah
rct2: movb $0x07, %al
outw %ax, %dx
stc
rct3: ret
# Table of routines for setting of the special modes.
spec_inits:
.word set_80x25
.word set_8pixel
.word set_80x43
.word set_80x28
.word set_current
.word set_80x30
.word set_80x34
.word set_80x60
.word set_gfx
# Set the 80x25 mode. If already set, do nothing.
set_80x25:
movw $0x5019, force_size # Override possibly broken BIOS
use_80x25:
#ifdef CONFIG_VIDEO_400_HACK
movw $0x1202, %ax # Force 400 scan lines
movb $0x30, %bl
int $0x10
#else
movb $0x0f, %ah # Get current mode ID
int $0x10
cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
jz st80 # on CGA/MDA/HGA and is also available on EGAM
cmpw $0x5003, %ax # Unknown mode, force 80x25 color
jnz force3
st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
jz set80
movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
orb %al, %al # Some buggy BIOS'es set 0 rows
jz set80
cmpb $24, %al # It's hopefully correct
jz set80
#endif /* CONFIG_VIDEO_400_HACK */
force3: DO_STORE
movw $0x0003, %ax # Forced set
int $0x10
set80: stc
ret
# Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
set_8pixel:
DO_STORE
call use_80x25 # The base is 80x25
set_8pt:
movw $0x1112, %ax # Use 8x8 font
xorb %bl, %bl
int $0x10
movw $0x1200, %ax # Use alternate print screen
movb $0x20, %bl
int $0x10
movw $0x1201, %ax # Turn off cursor emulation
movb $0x34, %bl
int $0x10
movb $0x01, %ah # Define cursor scan lines 6-7
movw $0x0607, %cx
int $0x10
set_current:
stc
ret
# Set the 80x28 mode. This mode works on all VGA's, because it's a standard
# 80x25 mode with 14-point fonts instead of 16-point.
set_80x28:
DO_STORE
call use_80x25 # The base is 80x25
set14: movw $0x1111, %ax # Use 9x14 font
xorb %bl, %bl
int $0x10
movb $0x01, %ah # Define cursor scan lines 11-12
movw $0x0b0c, %cx
int $0x10
stc
ret
# Set the 80x43 mode. This mode is works on all VGA's.
# It's a 350-scanline mode with 8-pixel font.
set_80x43:
DO_STORE
movw $0x1201, %ax # Set 350 scans
movb $0x30, %bl
int $0x10
movw $0x0003, %ax # Reset video mode
int $0x10
jmp set_8pt # Use 8-pixel font
# Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
set_80x30:
call use_80x25 # Start with real 80x25
DO_STORE
movw $0x3cc, %dx # Get CRTC port
inb %dx, %al
movb $0xd4, %dl
rorb %al # Mono or color?
jc set48a
movb $0xb4, %dl
set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
call outidx
movw $0x0b06, %ax # Vertical total
call outidx
movw $0x3e07, %ax # (Vertical) overflow
call outidx
movw $0xea10, %ax # Vertical sync start
call outidx
movw $0xdf12, %ax # Vertical display end
call outidx
movw $0xe715, %ax # Vertical blank start
call outidx
movw $0x0416, %ax # Vertical blank end
call outidx
pushw %dx
movb $0xcc, %dl # Misc output register (read)
inb %dx, %al
movb $0xc2, %dl # (write)
andb $0x0d, %al # Preserve clock select bits and color bit
orb $0xe2, %al # Set correct sync polarity
outb %al, %dx
popw %dx
movw $0x501e, force_size
stc # That's all.
ret
# Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
set_80x34:
call set_80x30 # Set 480 scans
call set14 # And 14-pt font
movw $0xdb12, %ax # VGA vertical display end
movw $0x5022, force_size
setvde: call outidx
stc
ret
# Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
set_80x60:
call set_80x30 # Set 480 scans
call set_8pt # And 8-pt font
movw $0xdf12, %ax # VGA vertical display end
movw $0x503c, force_size
jmp setvde
# Special hack for ThinkPad graphics
set_gfx:
#ifdef CONFIG_VIDEO_GFX_HACK
movw $VIDEO_GFX_BIOS_AX, %ax
movw $VIDEO_GFX_BIOS_BX, %bx
int $0x10
movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size
stc
#endif
ret
#ifdef CONFIG_VIDEO_RETAIN
# Store screen contents to temporary buffer.
store_screen:
cmpb $0, do_restore # Already stored?
jnz stsr
testb $CAN_USE_HEAP, loadflags # Have we space for storing?
jz stsr
pushw %ax
pushw %bx
pushw force_size # Don't force specific size
movw $0, force_size
call mode_params # Obtain params of current mode
popw force_size
movb %fs:(PARAM_VIDEO_LINES), %ah
movb %fs:(PARAM_VIDEO_COLS), %al
movw %ax, %bx # BX=dimensions
mulb %ah
movw %ax, %cx # CX=number of characters
addw %ax, %ax # Calculate image size
addw $modelist+1024+4, %ax
cmpw heap_end_ptr, %ax
jnc sts1 # Unfortunately, out of memory
movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
leaw modelist+1024, %di
stosw
movw %bx, %ax
stosw
pushw %ds # Store the screen
movw video_segment, %ds
xorw %si, %si
rep
movsw
popw %ds
incb do_restore # Screen will be restored later
sts1: popw %bx
popw %ax
stsr: ret
# Restore screen contents from temporary buffer.
restore_screen:
cmpb $0, do_restore # Has the screen been stored?
jz res1
call mode_params # Get parameters of current mode
movb %fs:(PARAM_VIDEO_LINES), %cl
movb %fs:(PARAM_VIDEO_COLS), %ch
leaw modelist+1024, %si # Screen buffer
lodsw # Set cursor position
movw %ax, %dx
cmpb %cl, %dh
jc res2
movb %cl, %dh
decb %dh
res2: cmpb %ch, %dl
jc res3
movb %ch, %dl
decb %dl
res3: movb $0x02, %ah
movb $0x00, %bh
int $0x10
lodsw # Display size
movb %ah, %dl # DL=number of lines
movb $0, %ah # BX=phys. length of orig. line
movw %ax, %bx
cmpb %cl, %dl # Too many?
jc res4
pushw %ax
movb %dl, %al
subb %cl, %al
mulb %bl
addw %ax, %si
addw %ax, %si
popw %ax
movb %cl, %dl
res4: cmpb %ch, %al # Too wide?
jc res5
movb %ch, %al # AX=width of src. line
res5: movb $0, %cl
xchgb %ch, %cl
movw %cx, %bp # BP=width of dest. line
pushw %es
movw video_segment, %es
xorw %di, %di # Move the data
addw %bx, %bx # Convert BX and BP to _bytes_
addw %bp, %bp
res6: pushw %si
pushw %di
movw %ax, %cx
rep
movsw
popw %di
popw %si
addw %bp, %di
addw %bx, %si
decb %dl
jnz res6
popw %es # Done
res1: ret
#endif /* CONFIG_VIDEO_RETAIN */
# Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
outidx: outb %al, %dx
pushw %ax
movb %ah, %al
incw %dx
outb %al, %dx
decw %dx
popw %ax
ret
# Build the table of video modes (stored after the setup.S code at the
# `modelist' label. Each video mode record looks like:
# .word MODE-ID (our special mode ID (see above))
# .byte rows (number of rows)
# .byte columns (number of columns)
# Returns address of the end of the table in DI, the end is marked
# with a ASK_VGA ID.
mode_table:
movw mt_end, %di # Already filled?
orw %di, %di
jnz mtab1x
leaw modelist, %di # Store standard modes:
movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
stosl
movb adapter, %al # CGA/MDA/HGA -- no more modes
orb %al, %al
jz mtabe
decb %al
jnz mtabv
movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
stosl
jmp mtabe
mtab1x: jmp mtab1
mtabv: leaw vga_modes, %si # All modes for std VGA
movw $vga_modes_end-vga_modes, %cx
rep # I'm unable to use movsw as I don't know how to store a half
movsb # of the expression above to cx without using explicit shr.
cmpb $0, scanning # Mode scan requested?
jz mscan1
call mode_scan
mscan1:
#ifdef CONFIG_VIDEO_LOCAL
call local_modes
#endif /* CONFIG_VIDEO_LOCAL */
#ifdef CONFIG_VIDEO_VESA
call vesa_modes # Detect VESA VGA modes
#endif /* CONFIG_VIDEO_VESA */
#ifdef CONFIG_VIDEO_SVGA
cmpb $0, scanning # Bypass when scanning
jnz mscan2
call svga_modes # Detect SVGA cards & modes
mscan2:
#endif /* CONFIG_VIDEO_SVGA */
mtabe:
#ifdef CONFIG_VIDEO_COMPACT
leaw modelist, %si
movw %di, %dx
movw %si, %di
cmt1: cmpw %dx, %si # Scan all modes
jz cmt2
leaw modelist, %bx # Find in previous entries
movw 2(%si), %cx
cmt3: cmpw %bx, %si
jz cmt4
cmpw 2(%bx), %cx # Found => don't copy this entry
jz cmt5
addw $4, %bx
jmp cmt3
cmt4: movsl # Copy entry
jmp cmt1
cmt5: addw $4, %si # Skip entry
jmp cmt1
cmt2:
#endif /* CONFIG_VIDEO_COMPACT */
movw $ASK_VGA, (%di) # End marker
movw %di, mt_end
mtab1: leaw modelist, %si # SI=mode list, DI=list end
ret0: ret
# Modes usable on all standard VGAs
vga_modes:
.word VIDEO_8POINT
.word 0x5032 # 80x50
.word VIDEO_80x43
.word 0x502b # 80x43
.word VIDEO_80x28
.word 0x501c # 80x28
.word VIDEO_80x30
.word 0x501e # 80x30
.word VIDEO_80x34
.word 0x5022 # 80x34
.word VIDEO_80x60
.word 0x503c # 80x60
#ifdef CONFIG_VIDEO_GFX_HACK
.word VIDEO_GFX_HACK
.word VIDEO_GFX_DUMMY_RESOLUTION
#endif
vga_modes_end:
# Detect VESA modes.
#ifdef CONFIG_VIDEO_VESA
vesa_modes:
cmpb $2, adapter # VGA only
jnz ret0
movw %di, %bp # BP=original mode table end
addw $0x200, %di # Buffer space
movw $0x4f00, %ax # VESA Get card info call
int $0x10
movw %bp, %di
cmpw $0x004f, %ax # Successful?
jnz ret0
cmpw $0x4556, 0x200(%di)
jnz ret0
cmpw $0x4153, 0x202(%di)
jnz ret0
movw $vesa_name, card_name # Set name to "VESA VGA"
pushw %gs
lgsw 0x20e(%di), %si # GS:SI=mode list
movw $128, %cx # Iteration limit
vesa1:
# gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
# XXX: lodsw %gs:(%si), %ax # Get next mode in the list
gs; lodsw
cmpw $0xffff, %ax # End of the table?
jz vesar
cmpw $0x0080, %ax # Check validity of mode ID
jc vesa2
orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
jz vesan # Certain BIOSes report 0x80-0xff!
cmpw $0x0800, %ax
jnc vesae
vesa2: pushw %cx
movw %ax, %cx # Get mode information structure
movw $0x4f01, %ax
int $0x10
movw %cx, %bx # BX=mode number
addb $VIDEO_FIRST_VESA>>8, %bh
popw %cx
cmpw $0x004f, %ax
jnz vesan # Don't report errors (buggy BIOSES)
movb (%di), %al # Check capabilities. We require
andb $0x19, %al # a color text mode.
cmpb $0x09, %al
jnz vesan
cmpw $0xb800, 8(%di) # Standard video memory address required
jnz vesan
testb $2, (%di) # Mode characteristics supplied?
movw %bx, (%di) # Store mode number
jz vesa3
xorw %dx, %dx
movw 0x12(%di), %bx # Width
orb %bh, %bh
jnz vesan
movb %bl, 0x3(%di)
movw 0x14(%di), %ax # Height
orb %ah, %ah
jnz vesan
movb %al, 2(%di)
mulb %bl
cmpw $8193, %ax # Small enough for Linux console driver?
jnc vesan
jmp vesaok
vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
jc vesan # so it must be a standard VESA mode.
cmpw $5, %bx
jnc vesan
movw vesa_text_mode_table(%bx), %ax
movw %ax, 2(%di)
vesaok: addw $4, %di # The mode is valid. Store it.
vesan: loop vesa1 # Next mode. Limit exceeded => error
vesae: leaw vesaer, %si
call prtstr
movw %bp, %di # Discard already found modes.
vesar: popw %gs
ret
# Dimensions of standard VESA text modes
vesa_text_mode_table:
.byte 60, 80 # 0108
.byte 25, 132 # 0109
.byte 43, 132 # 010A
.byte 50, 132 # 010B
.byte 60, 132 # 010C
#endif /* CONFIG_VIDEO_VESA */
# Scan for video modes. A bit dirty, but should work.
mode_scan:
movw $0x0100, %cx # Start with mode 0
scm1: movb $0, %ah # Test the mode
movb %cl, %al
int $0x10
movb $0x0f, %ah
int $0x10
cmpb %cl, %al
jnz scm2 # Mode not set
movw $0x3c0, %dx # Test if it's a text mode
movb $0x10, %al # Mode bits
call inidx
andb $0x03, %al
jnz scm2
movb $0xce, %dl # Another set of mode bits
movb $0x06, %al
call inidx
shrb %al
jc scm2
movb $0xd4, %dl # Cursor location
movb $0x0f, %al
call inidx
orb %al, %al
jnz scm2
movw %cx, %ax # Ok, store the mode
stosw
movb %gs:(0x484), %al # Number of rows
incb %al
stosb
movw %gs:(0x44a), %ax # Number of columns
stosb
scm2: incb %cl
jns scm1
movw $0x0003, %ax # Return back to mode 3
int $0x10
ret
tstidx: outw %ax, %dx # OUT DX,AX and inidx
inidx: outb %al, %dx # Read from indexed VGA register
incw %dx # AL=index, DX=index reg port -> AL=data
inb %dx, %al
decw %dx
ret
# Try to detect type of SVGA card and supply (usually approximate) video
# mode table for it.
#ifdef CONFIG_VIDEO_SVGA
svga_modes:
leaw svga_table, %si # Test all known SVGA adapters
dosvga: lodsw
movw %ax, %bp # Default mode table
orw %ax, %ax
jz didsv1
lodsw # Pointer to test routine
pushw %si
pushw %di
pushw %es
movw $0xc000, %bx
movw %bx, %es
call *%ax # Call test routine
popw %es
popw %di
popw %si
orw %bp, %bp
jz dosvga
movw %bp, %si # Found, copy the modes
movb svga_prefix, %ah
cpsvga: lodsb
orb %al, %al
jz didsv
stosw
movsw
jmp cpsvga
didsv: movw %si, card_name # Store pointer to card name
didsv1: ret
# Table of all known SVGA cards. For each card, we store a pointer to
# a table of video modes supported by the card and a pointer to a routine
# used for testing of presence of the card. The video mode table is always
# followed by the name of the card or the chipset.
svga_table:
.word ati_md, ati_test
.word oak_md, oak_test
.word paradise_md, paradise_test
.word realtek_md, realtek_test
.word s3_md, s3_test
.word chips_md, chips_test
.word video7_md, video7_test
.word cirrus5_md, cirrus5_test
.word cirrus6_md, cirrus6_test
.word cirrus1_md, cirrus1_test
.word ahead_md, ahead_test
.word everex_md, everex_test
.word genoa_md, genoa_test
.word trident_md, trident_test
.word tseng_md, tseng_test
.word 0
# Test routines and mode tables:
# S3 - The test algorithm was taken from the SuperProbe package
# for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
s3_test:
movw $0x0f35, %cx # we store some constants in cl/ch
movw $0x03d4, %dx
movb $0x38, %al
call inidx
movb %al, %bh # store current CRT-register 0x38
movw $0x0038, %ax
call outidx # disable writing to special regs
movb %cl, %al # check whether we can write special reg 0x35
call inidx
movb %al, %bl # save the current value of CRT reg 0x35
andb $0xf0, %al # clear bits 0-3
movb %al, %ah
movb %cl, %al # and write it to CRT reg 0x35
call outidx
call inidx # now read it back
andb %ch, %al # clear the upper 4 bits
jz s3_2 # the first test failed. But we have a
movb %bl, %ah # second chance
movb %cl, %al
call outidx
jmp s3_1 # do the other tests
s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
orb %bl, %ah # set the upper 4 bits of ah with the orig value
call outidx # write ...
call inidx # ... and reread
andb %cl, %al # turn off the upper 4 bits
pushw %ax
movb %bl, %ah # restore old value in register 0x35
movb %cl, %al
call outidx
popw %ax
cmpb %ch, %al # setting lower 4 bits was successful => bad
je no_s3 # writing is allowed => this is not an S3
s3_1: movw $0x4838, %ax # allow writing to special regs by putting
call outidx # magic number into CRT-register 0x38
movb %cl, %al # check whether we can write special reg 0x35
call inidx
movb %al, %bl
andb $0xf0, %al
movb %al, %ah
movb %cl, %al
call outidx
call inidx
andb %ch, %al
jnz no_s3 # no, we can't write => no S3
movw %cx, %ax
orb %bl, %ah
call outidx
call inidx
andb %ch, %al
pushw %ax
movb %bl, %ah # restore old value in register 0x35
movb %cl, %al
call outidx
popw %ax
cmpb %ch, %al
jne no_s31 # writing not possible => no S3
movb $0x30, %al
call inidx # now get the S3 id ...
leaw idS3, %di
movw $0x10, %cx
repne
scasb
je no_s31
movb %bh, %ah
movb $0x38, %al
jmp s3rest
no_s3: movb $0x35, %al # restore CRT register 0x35
movb %bl, %ah
call outidx
no_s31: xorw %bp, %bp # Detection failed
s3rest: movb %bh, %ah
movb $0x38, %al # restore old value of CRT register 0x38
jmp outidx
idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
.byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
s3_md: .byte 0x54, 0x2b, 0x84
.byte 0x55, 0x19, 0x84
.byte 0
.ascii "S3"
.byte 0
# ATI cards.
ati_test:
leaw idati, %si
movw $0x31, %di
movw $0x09, %cx
repe
cmpsb
je atiok
xorw %bp, %bp
atiok: ret
idati: .ascii "761295520"
ati_md: .byte 0x23, 0x19, 0x84
.byte 0x33, 0x2c, 0x84
.byte 0x22, 0x1e, 0x64
.byte 0x21, 0x19, 0x64
.byte 0x58, 0x21, 0x50
.byte 0x5b, 0x1e, 0x50
.byte 0
.ascii "ATI"
.byte 0
# AHEAD
ahead_test:
movw $0x200f, %ax
movw $0x3ce, %dx
outw %ax, %dx
incw %dx
inb %dx, %al
cmpb $0x20, %al
je isahed
cmpb $0x21, %al
je isahed
xorw %bp, %bp
isahed: ret
ahead_md:
.byte 0x22, 0x2c, 0x84
.byte 0x23, 0x19, 0x84
.byte 0x24, 0x1c, 0x84
.byte 0x2f, 0x32, 0xa0
.byte 0x32, 0x22, 0x50
.byte 0x34, 0x42, 0x50
.byte 0
.ascii "Ahead"
.byte 0
# Chips & Tech.
chips_test:
movw $0x3c3, %dx
inb %dx, %al
orb $0x10, %al
outb %al, %dx
movw $0x104, %dx
inb %dx, %al
movb %al, %bl
movw $0x3c3, %dx
inb %dx, %al
andb $0xef, %al
outb %al, %dx
cmpb $0xa5, %bl
je cantok
xorw %bp, %bp
cantok: ret
chips_md:
.byte 0x60, 0x19, 0x84
.byte 0x61, 0x32, 0x84
.byte 0
.ascii "Chips & Technologies"
.byte 0
# Cirrus Logic 5X0
cirrus1_test:
movw $0x3d4, %dx
movb $0x0c, %al
outb %al, %dx
incw %dx
inb %dx, %al
movb %al, %bl
xorb %al, %al
outb %al, %dx
decw %dx
movb $0x1f, %al
outb %al, %dx
incw %dx
inb %dx, %al
movb %al, %bh
xorb %ah, %ah
shlb $4, %al
movw %ax, %cx
movb %bh, %al
shrb $4, %al
addw %ax, %cx
shlw $8, %cx
addw $6, %cx
movw %cx, %ax
movw $0x3c4, %dx
outw %ax, %dx
incw %dx
inb %dx, %al
andb %al, %al
jnz nocirr
movb %bh, %al
outb %al, %dx
inb %dx, %al
cmpb $0x01, %al
je iscirr
nocirr: xorw %bp, %bp
iscirr: movw $0x3d4, %dx
movb %bl, %al
xorb %ah, %ah
shlw $8, %ax
addw $0x0c, %ax
outw %ax, %dx
ret
cirrus1_md:
.byte 0x1f, 0x19, 0x84
.byte 0x20, 0x2c, 0x84
.byte 0x22, 0x1e, 0x84
.byte 0x31, 0x25, 0x64
.byte 0
.ascii "Cirrus Logic 5X0"
.byte 0
# Cirrus Logic 54XX
cirrus5_test:
movw $0x3c4, %dx
movb $6, %al
call inidx
movb %al, %bl # BL=backup
movw $6, %ax
call tstidx
cmpb $0x0f, %al
jne c5fail
movw $0x1206, %ax
call tstidx
cmpb $0x12, %al
jne c5fail
movb $0x1e, %al
call inidx
movb %al, %bh
movb %bh, %ah
andb $0xc0, %ah
movb $0x1e, %al
call tstidx
andb $0x3f, %al
jne c5xx
movb $0x1e, %al
movb %bh, %ah
orb $0x3f, %ah
call tstidx
xorb $0x3f, %al
andb $0x3f, %al
c5xx: pushf
movb $0x1e, %al
movb %bh, %ah
outw %ax, %dx
popf
je c5done
c5fail: xorw %bp, %bp
c5done: movb $6, %al
movb %bl, %ah
outw %ax, %dx
ret
cirrus5_md:
.byte 0x14, 0x19, 0x84
.byte 0x54, 0x2b, 0x84
.byte 0
.ascii "Cirrus Logic 54XX"
.byte 0
# Cirrus Logic 64XX -- no known extra modes, but must be identified, because
# it's misidentified by the Ahead test.
cirrus6_test:
movw $0x3ce, %dx
movb $0x0a, %al
call inidx
movb %al, %bl # BL=backup
movw $0xce0a, %ax
call tstidx
orb %al, %al
jne c2fail
movw $0xec0a, %ax
call tstidx
cmpb $0x01, %al
jne c2fail
movb $0xaa, %al
call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
shrb $4, %al
subb $4, %al
jz c6done
decb %al
jz c6done
subb $2, %al
jz c6done
decb %al
jz c6done
c2fail: xorw %bp, %bp
c6done: movb $0x0a, %al
movb %bl, %ah
outw %ax, %dx
ret
cirrus6_md:
.byte 0
.ascii "Cirrus Logic 64XX"
.byte 0
# Everex / Trident
everex_test:
movw $0x7000, %ax
xorw %bx, %bx
int $0x10
cmpb $0x70, %al
jne noevrx
shrw $4, %dx
cmpw $0x678, %dx
je evtrid
cmpw $0x236, %dx
jne evrxok
evtrid: leaw trident_md, %bp
evrxok: ret
noevrx: xorw %bp, %bp
ret
everex_md:
.byte 0x03, 0x22, 0x50
.byte 0x04, 0x3c, 0x50
.byte 0x07, 0x2b, 0x64
.byte 0x08, 0x4b, 0x64
.byte 0x0a, 0x19, 0x84
.byte 0x0b, 0x2c, 0x84
.byte 0x16, 0x1e, 0x50
.byte 0x18, 0x1b, 0x64
.byte 0x21, 0x40, 0xa0
.byte 0x40, 0x1e, 0x84
.byte 0
.ascii "Everex/Trident"
.byte 0
# Genoa.
genoa_test:
leaw idgenoa, %si # Check Genoa 'clues'
xorw %ax, %ax
movb %es:(0x37), %al
movw %ax, %di
movw $0x04, %cx
decw %si
decw %di
l1: incw %si
incw %di
movb (%si), %al
testb %al, %al
jz l2
cmpb %es:(%di), %al
l2: loope l1
orw %cx, %cx
je isgen
xorw %bp, %bp
isgen: ret
idgenoa: .byte 0x77, 0x00, 0x99, 0x66
genoa_md:
.byte 0x58, 0x20, 0x50
.byte 0x5a, 0x2a, 0x64
.byte 0x60, 0x19, 0x84
.byte 0x61, 0x1d, 0x84
.byte 0x62, 0x20, 0x84
.byte 0x63, 0x2c, 0x84
.byte 0x64, 0x3c, 0x84
.byte 0x6b, 0x4f, 0x64
.byte 0x72, 0x3c, 0x50
.byte 0x74, 0x42, 0x50
.byte 0x78, 0x4b, 0x64
.byte 0
.ascii "Genoa"
.byte 0
# OAK
oak_test:
leaw idoakvga, %si
movw $0x08, %di
movw $0x08, %cx
repe
cmpsb
je isoak
xorw %bp, %bp
isoak: ret
idoakvga: .ascii "OAK VGA "
oak_md: .byte 0x4e, 0x3c, 0x50
.byte 0x4f, 0x3c, 0x84
.byte 0x50, 0x19, 0x84
.byte 0x51, 0x2b, 0x84
.byte 0
.ascii "OAK"
.byte 0
# WD Paradise.
paradise_test:
leaw idparadise, %si
movw $0x7d, %di
movw $0x04, %cx
repe
cmpsb
je ispara
xorw %bp, %bp
ispara: ret
idparadise: .ascii "VGA="
paradise_md:
.byte 0x41, 0x22, 0x50
.byte 0x47, 0x1c, 0x84
.byte 0x55, 0x19, 0x84
.byte 0x54, 0x2c, 0x84
.byte 0
.ascii "Paradise"
.byte 0
# Trident.
trident_test:
movw $0x3c4, %dx
movb $0x0e, %al
outb %al, %dx
incw %dx
inb %dx, %al
xchgb %al, %ah
xorb %al, %al
outb %al, %dx
inb %dx, %al
xchgb %ah, %al
movb %al, %bl # Strange thing ... in the book this wasn't
andb $0x02, %bl # necessary but it worked on my card which
jz setb2 # is a trident. Without it the screen goes
# blurred ...
andb $0xfd, %al
jmp clrb2
setb2: orb $0x02, %al
clrb2: outb %al, %dx
andb $0x0f, %ah
cmpb $0x02, %ah
je istrid
xorw %bp, %bp
istrid: ret
trident_md:
.byte 0x50, 0x1e, 0x50
.byte 0x51, 0x2b, 0x50
.byte 0x52, 0x3c, 0x50
.byte 0x57, 0x19, 0x84
.byte 0x58, 0x1e, 0x84
.byte 0x59, 0x2b, 0x84
.byte 0x5a, 0x3c, 0x84
.byte 0
.ascii "Trident"
.byte 0
# Tseng.
tseng_test:
movw $0x3cd, %dx
inb %dx, %al # Could things be this simple ! :-)
movb %al, %bl
movb $0x55, %al
outb %al, %dx
inb %dx, %al
movb %al, %ah
movb %bl, %al
outb %al, %dx
cmpb $0x55, %ah
je istsen
isnot: xorw %bp, %bp
istsen: ret
tseng_md:
.byte 0x26, 0x3c, 0x50
.byte 0x2a, 0x28, 0x64
.byte 0x23, 0x19, 0x84
.byte 0x24, 0x1c, 0x84
.byte 0x22, 0x2c, 0x84
.byte 0x21, 0x3c, 0x84
.byte 0
.ascii "Tseng"
.byte 0
# Video7.
video7_test:
movw $0x3cc, %dx
inb %dx, %al
movw $0x3b4, %dx
andb $0x01, %al
jz even7
movw $0x3d4, %dx
even7: movb $0x0c, %al
outb %al, %dx
incw %dx
inb %dx, %al
movb %al, %bl
movb $0x55, %al
outb %al, %dx
inb %dx, %al
decw %dx
movb $0x1f, %al
outb %al, %dx
incw %dx
inb %dx, %al
movb %al, %bh
decw %dx
movb $0x0c, %al
outb %al, %dx
incw %dx
movb %bl, %al
outb %al, %dx
movb $0x55, %al
xorb $0xea, %al
cmpb %bh, %al
jne isnot
movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
ret
video7_md:
.byte 0x40, 0x2b, 0x50
.byte 0x43, 0x3c, 0x50
.byte 0x44, 0x3c, 0x64
.byte 0x41, 0x19, 0x84
.byte 0x42, 0x2c, 0x84
.byte 0x45, 0x1c, 0x84
.byte 0
.ascii "Video 7"
.byte 0
# Realtek VGA
realtek_test:
leaw idrtvga, %si
movw $0x45, %di
movw $0x0b, %cx
repe
cmpsb
je isrt
xorw %bp, %bp
isrt: ret
idrtvga: .ascii "REALTEK VGA"
realtek_md:
.byte 0x1a, 0x3c, 0x50
.byte 0x1b, 0x19, 0x84
.byte 0x1c, 0x1e, 0x84
.byte 0x1d, 0x2b, 0x84
.byte 0x1e, 0x3c, 0x84
.byte 0
.ascii "REALTEK"
.byte 0
#endif /* CONFIG_VIDEO_SVGA */
# User-defined local mode table (VGA only)
#ifdef CONFIG_VIDEO_LOCAL
local_modes:
leaw local_mode_table, %si
locm1: lodsw
orw %ax, %ax
jz locm2
stosw
movsw
jmp locm1
locm2: ret
# This is the table of local video modes which can be supplied manually
# by the user. Each entry consists of mode ID (word) and dimensions
# (byte for column count and another byte for row count). These modes
# are placed before all SVGA and VESA modes and override them if table
# compacting is enabled. The table must end with a zero word followed
# by NUL-terminated video adapter name.
local_mode_table:
.word 0x0100 # Example: 40x25
.byte 25,40
.word 0
.ascii "Local"
.byte 0
#endif /* CONFIG_VIDEO_LOCAL */
# Read a key and return the ASCII code in al, scan code in ah
getkey: xorb %ah, %ah
int $0x16
ret
# Read a key with a timeout of 30 seconds.
# The hardware clock is used to get the time.
getkt: call gettime
addb $30, %al # Wait 30 seconds
cmpb $60, %al
jl lminute
subb $60, %al
lminute:
movb %al, %cl
again: movb $0x01, %ah
int $0x16
jnz getkey # key pressed, so get it
call gettime
cmpb %cl, %al
jne again
movb $0x20, %al # timeout, return `space'
ret
# Flush the keyboard buffer
flush: movb $0x01, %ah
int $0x16
jz empty
xorb %ah, %ah
int $0x16
jmp flush
empty: ret
# Print hexadecimal number.
prthw: pushw %ax
movb %ah, %al
call prthb
popw %ax
prthb: pushw %ax
shrb $4, %al
call prthn
popw %ax
andb $0x0f, %al
prthn: cmpb $0x0a, %al
jc prth1
addb $0x07, %al
prth1: addb $0x30, %al
jmp prtchr
# Print decimal number in al
prtdec: pushw %ax
pushw %cx
xorb %ah, %ah
movb $0x0a, %cl
idivb %cl
cmpb $0x09, %al
jbe lt100
call prtdec
jmp skip10
lt100: addb $0x30, %al
call prtchr
skip10: movb %ah, %al
addb $0x30, %al
call prtchr
popw %cx
popw %ax
ret
store_edid:
#ifdef CONFIG_FIRMWARE_EDID
pushw %es # just save all registers
pushw %ax
pushw %bx
pushw %cx
pushw %dx
pushw %di
pushw %fs
popw %es
movl $0x13131313, %eax # memset block with 0x13
movw $32, %cx
movw $0x140, %di
cld
rep
stosl
cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
jl no_edid
pushw %es # save ES
xorw %di, %di # Report Capability
pushw %di
popw %es # ES:DI must be 0:0
movw $0x4f15, %ax
xorw %bx, %bx
xorw %cx, %cx
int $0x10
popw %es # restore ES
cmpb $0x00, %ah # call successful
jne no_edid
cmpb $0x4f, %al # function supported
jne no_edid
movw $0x4f15, %ax # do VBE/DDC
movw $0x01, %bx
movw $0x00, %cx
movw $0x00, %dx
movw $0x140, %di
int $0x10
no_edid:
popw %di # restore all registers
popw %dx
popw %cx
popw %bx
popw %ax
popw %es
#endif
ret
# VIDEO_SELECT-only variables
mt_end: .word 0 # End of video mode table if built
edit_buf: .space 6 # Line editor buffer
card_name: .word 0 # Pointer to adapter name
scanning: .byte 0 # Performing mode scan
do_restore: .byte 0 # Screen contents altered during mode change
svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
dac_size: .byte 6 # DAC bit depth
vbe_version: .word 0 # VBE bios version
# Status messages
keymsg: .ascii "Press <RETURN> to see video modes available, "
.ascii "<SPACE> to continue or wait 30 secs"
.byte 0x0d, 0x0a, 0
listhdr: .byte 0x0d, 0x0a
.ascii "Mode: COLSxROWS:"
crlft: .byte 0x0d, 0x0a, 0
prompt: .byte 0x0d, 0x0a
.asciz "Enter mode number or `scan': "
unknt: .asciz "Unknown mode ID. Try again."
badmdt: .ascii "You passed an undefined mode number."
.byte 0x0d, 0x0a, 0
vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
.ascii "report to <mj@ucw.cz>."
.byte 0x0d, 0x0a, 0
old_name: .asciz "CGA/MDA/HGA"
ega_name: .asciz "EGA"
svga_name: .ascii " "
vga_name: .asciz "VGA"
vesa_name: .asciz "VESA"
name_bann: .asciz "Video adapter: "
#endif /* CONFIG_VIDEO_SELECT */
# Other variables:
adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
video_segment: .word 0xb800 # Video memory segment
force_size: .word 0 # Use this size instead of the one in BIOS vars
arch/i386/kernel/verify_cpu.S deleted 100644 → 0
View file @ 91a6c462
/* Check if CPU has some minimum CPUID bits
This runs in 16bit mode so that the caller can still use the BIOS
to output errors on the screen */
#include <asm/cpufeature.h>
#include <asm/msr.h>
verify_cpu:
pushfl # Save caller passed flags
pushl $0 # Kill any dangerous flags
popfl
#if CONFIG_X86_MINIMUM_CPU_FAMILY >= 4
pushfl
pop %eax
orl $(1<<18),%eax # try setting AC
push %eax
popfl
pushfl
popl %eax
testl $(1<<18),%eax
jz bad
#endif
#if REQUIRED_MASK0 != 0
pushfl # standard way to check for cpuid
popl %eax
movl %eax,%ebx
xorl $0x200000,%eax
pushl %eax
popfl
pushfl
popl %eax
cmpl %eax,%ebx
pushfl # standard way to check for cpuid
popl %eax
movl %eax,%ebx
xorl $0x200000,%eax
pushl %eax
popfl
pushfl
popl %eax
cmpl %eax,%ebx
jz bad # REQUIRED_MASK0 != 0 requires CPUID
movl $0x0,%eax # See if cpuid 1 is implemented
cpuid
cmpl $0x1,%eax
jb bad # no cpuid 1
#if REQUIRED_MASK0 & NEED_CMPXCHG64
/* Some VIA C3s need magic MSRs to enable CX64. Do this here */
cmpl $0x746e6543,%ebx # Cent
jne 1f
cmpl $0x48727561,%edx # aurH
jne 1f
cmpl $0x736c7561,%ecx # auls
jne 1f
movl $1,%eax # check model
cpuid
movl %eax,%ebx
shr $8,%ebx
andl $0xf,%ebx
cmp $6,%ebx # check family == 6
jne 1f
shr $4,%eax
andl $0xf,%eax
cmpl $6,%eax # check model >= 6
jb 1f
# assume models >= 6 all support this MSR
movl $MSR_VIA_FCR,%ecx
rdmsr
orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
wrmsr
1:
#endif
movl $0x1,%eax # Does the cpu have what it takes
cpuid
#if CONFIG_X86_MINIMUM_CPU_FAMILY > 4
#error add proper model checking here
#endif
andl $REQUIRED_MASK0,%edx
xorl $REQUIRED_MASK0,%edx
jnz bad
#endif /* REQUIRED_MASK0 */
popfl
xor %eax,%eax
ret
bad:
popfl
movl $1,%eax
ret
include/linux/edd.h
View file @ c3973682
......@@ -49,10 +49,6 @@
#define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
#define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
in boot_params - treat this as 1 byte */
#define EDD_CL_EQUALS 0x3d646465 /* "edd=" */
#define EDD_CL_OFF 0x666f /* "of" for off */
#define EDD_CL_SKIP 0x6b73 /* "sk" for skipmbr */
#define EDD_CL_ON 0x6e6f /* "on" for on */
#ifndef __ASSEMBLY__
......
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