[PATCH] FRV: Fujitsu FR-V CPU arch implementation part 3

The attached patches provides part 3 of an architecture implementation
for the Fujitsu FR-V CPU series, configurably as Linux or uClinux.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/frv/kernel/frv_ksyms.c

+#include <linux/module.h>
+#include <linux/linkage.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/user.h>
+#include <linux/elfcore.h>
+#include <linux/in6.h>
+#include <linux/interrupt.h>
+#include <linux/config.h>
+
+#include <asm/setup.h>
+#include <asm/pgalloc.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/semaphore.h>
+#include <asm/checksum.h>
+#include <asm/hardirq.h>
+#include <asm/current.h>
+
+extern void dump_thread(struct pt_regs *, struct user *);
+extern long __memcpy_user(void *dst, const void *src, size_t count);
+
+/* platform dependent support */
+
+EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(iounmap);
+
+EXPORT_SYMBOL(dump_thread);
+EXPORT_SYMBOL(strnlen);
+EXPORT_SYMBOL(strrchr);
+EXPORT_SYMBOL(strstr);
+EXPORT_SYMBOL(strchr);
+EXPORT_SYMBOL(strcat);
+EXPORT_SYMBOL(strlen);
+EXPORT_SYMBOL(strcmp);
+EXPORT_SYMBOL(strncmp);
+EXPORT_SYMBOL(strncpy);
+
+EXPORT_SYMBOL(ip_fast_csum);
+
+#if 0
+EXPORT_SYMBOL(local_irq_count);
+EXPORT_SYMBOL(local_bh_count);
+#endif
+EXPORT_SYMBOL(kernel_thread);
+
+EXPORT_SYMBOL(enable_irq);
+EXPORT_SYMBOL(disable_irq);
+EXPORT_SYMBOL(__res_bus_clock_speed_HZ);
+EXPORT_SYMBOL(__page_offset);
+EXPORT_SYMBOL(__memcpy_user);
+EXPORT_SYMBOL(flush_dcache_page);
+
+#ifndef CONFIG_MMU
+EXPORT_SYMBOL(memory_start);
+EXPORT_SYMBOL(memory_end);
+#endif
+
+EXPORT_SYMBOL(__debug_bug_trap);
+
+/* Networking helper routines. */
+EXPORT_SYMBOL(csum_partial_copy);
+
+/* The following are special because they're not called
+   explicitly (the C compiler generates them).  Fortunately,
+   their interface isn't gonna change any time soon now, so
+   it's OK to leave it out of version control.  */
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcmp);
+EXPORT_SYMBOL(memscan);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(strtok);
+
+EXPORT_SYMBOL(get_wchan);
+
+#ifdef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
+EXPORT_SYMBOL(atomic_test_and_ANDNOT_mask);
+EXPORT_SYMBOL(atomic_test_and_OR_mask);
+EXPORT_SYMBOL(atomic_test_and_XOR_mask);
+EXPORT_SYMBOL(atomic_add_return);
+EXPORT_SYMBOL(atomic_sub_return);
+EXPORT_SYMBOL(__xchg_8);
+EXPORT_SYMBOL(__xchg_16);
+EXPORT_SYMBOL(__xchg_32);
+EXPORT_SYMBOL(__cmpxchg_8);
+EXPORT_SYMBOL(__cmpxchg_16);
+EXPORT_SYMBOL(__cmpxchg_32);
+#endif
+
+/*
+ * libgcc functions - functions that are used internally by the
+ * compiler...  (prototypes are not correct though, but that
+ * doesn't really matter since they're not versioned).
+ */
+extern void __gcc_bcmp(void);
+extern void __ashldi3(void);
+extern void __ashrdi3(void);
+extern void __cmpdi2(void);
+extern void __divdi3(void);
+extern void __lshrdi3(void);
+extern void __moddi3(void);
+extern void __muldi3(void);
+extern void __negdi2(void);
+extern void __ucmpdi2(void);
+extern void __udivdi3(void);
+extern void __udivmoddi4(void);
+extern void __umoddi3(void);
+
+        /* gcc lib functions */
+//EXPORT_SYMBOL(__gcc_bcmp);
+EXPORT_SYMBOL(__ashldi3);
+EXPORT_SYMBOL(__ashrdi3);
+//EXPORT_SYMBOL(__cmpdi2);
+//EXPORT_SYMBOL(__divdi3);
+EXPORT_SYMBOL(__lshrdi3);
+//EXPORT_SYMBOL(__moddi3);
+EXPORT_SYMBOL(__muldi3);
+EXPORT_SYMBOL(__negdi2);
+//EXPORT_SYMBOL(__ucmpdi2);
+//EXPORT_SYMBOL(__udivdi3);
+//EXPORT_SYMBOL(__udivmoddi4);
+//EXPORT_SYMBOL(__umoddi3);

arch/frv/kernel/gdb-io.c

+/* gdb-io.c: FR403 GDB stub I/O
+ *
+ * Copyright (C) 2003 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, 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/serial_reg.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/irc-regs.h>
+#include <asm/timer-regs.h>
+#include <asm/gdb-stub.h>
+#include "gdb-io.h"
+
+#ifdef CONFIG_GDBSTUB_UART0
+#define __UART(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X)))
+#define __UART_IRR_NMI 0xff0f0000
+#else /* CONFIG_GDBSTUB_UART1 */
+#define __UART(X) (*(volatile uint8_t *)(UART1_BASE + (UART_##X)))
+#define __UART_IRR_NMI 0xfff00000
+#endif
+
+#define LSR_WAIT_FOR(STATE)			\
+do {						\
+	gdbstub_do_rx();			\
+} while (!(__UART(LSR) & UART_LSR_##STATE))
+
+#define FLOWCTL_QUERY(LINE)	({ __UART(MSR) & UART_MSR_##LINE; })
+#define FLOWCTL_CLEAR(LINE)	do { __UART(MCR) &= ~UART_MCR_##LINE; mb(); } while (0)
+#define FLOWCTL_SET(LINE)	do { __UART(MCR) |= UART_MCR_##LINE;  mb(); } while (0)
+
+#define FLOWCTL_WAIT_FOR(LINE)			\
+do {						\
+	gdbstub_do_rx();			\
+} while(!FLOWCTL_QUERY(LINE))
+
+/*****************************************************************************/
+/*
+ * initialise the GDB stub
+ * - called with PSR.ET==0, so can't incur external interrupts
+ */
+void gdbstub_io_init(void)
+{
+	/* set up the serial port */
+	__UART(LCR) = UART_LCR_WLEN8; /* 1N8 */
+	__UART(FCR) =
+		UART_FCR_ENABLE_FIFO |
+		UART_FCR_CLEAR_RCVR |
+		UART_FCR_CLEAR_XMIT |
+		UART_FCR_TRIGGER_1;
+
+	FLOWCTL_CLEAR(DTR);
+	FLOWCTL_SET(RTS);
+
+//	gdbstub_set_baud(115200);
+
+	/* we want to get serial receive interrupts */
+	__UART(IER) = UART_IER_RDI | UART_IER_RLSI;
+	mb();
+
+	__set_IRR(6, __UART_IRR_NMI);	/* map ERRs and UARTx to NMI */
+
+} /* end gdbstub_io_init() */
+
+/*****************************************************************************/
+/*
+ * set up the GDB stub serial port baud rate timers
+ */
+void gdbstub_set_baud(unsigned baud)
+{
+	unsigned value, high, low;
+	u8 lcr;
+
+	/* work out the divisor to give us the nearest higher baud rate */
+	value = __serial_clock_speed_HZ / 16 / baud;
+
+	/* determine the baud rate range */
+	high = __serial_clock_speed_HZ / 16 / value;
+	low = __serial_clock_speed_HZ / 16 / (value + 1);
+
+	/* pick the nearest bound */
+	if (low + (high - low) / 2 > baud)
+		value++;
+
+	lcr = __UART(LCR);
+	__UART(LCR) |= UART_LCR_DLAB;
+	mb();
+	__UART(DLL) = value & 0xff;
+	__UART(DLM) = (value >> 8) & 0xff;
+	mb();
+	__UART(LCR) = lcr;
+	mb();
+
+} /* end gdbstub_set_baud() */
+
+/*****************************************************************************/
+/*
+ * receive characters into the receive FIFO
+ */
+void gdbstub_do_rx(void)
+{
+	unsigned ix, nix;
+
+	ix = gdbstub_rx_inp;
+
+	while (__UART(LSR) & UART_LSR_DR) {
+		nix = (ix + 2) & 0xfff;
+		if (nix == gdbstub_rx_outp)
+			break;
+
+		gdbstub_rx_buffer[ix++] = __UART(LSR);
+		gdbstub_rx_buffer[ix++] = __UART(RX);
+		ix = nix;
+	}
+
+	gdbstub_rx_inp = ix;
+
+	__clr_RC(15);
+	__clr_IRL();
+
+} /* end gdbstub_do_rx() */
+
+/*****************************************************************************/
+/*
+ * wait for a character to come from the debugger
+ */
+int gdbstub_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:
+	gdbstub_do_rx();
+
+	/* pull chars out of the buffer */
+	ix = gdbstub_rx_outp;
+	if (ix == gdbstub_rx_inp) {
+		if (nonblock)
+			return -EAGAIN;
+		//watchdog_alert_counter = 0;
+		goto try_again;
+	}
+
+	st = gdbstub_rx_buffer[ix++];
+	ch = 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;
+	}
+
+} /* end gdbstub_rx_char() */
+
+/*****************************************************************************/
+/*
+ * send a character to the debugger
+ */
+void gdbstub_tx_char(unsigned char ch)
+{
+	FLOWCTL_SET(DTR);
+	LSR_WAIT_FOR(THRE);
+//	FLOWCTL_WAIT_FOR(CTS);
+
+	if (ch == 0x0a) {
+		__UART(TX) = 0x0d;
+		mb();
+		LSR_WAIT_FOR(THRE);
+//		FLOWCTL_WAIT_FOR(CTS);
+	}
+	__UART(TX) = ch;
+	mb();
+
+	FLOWCTL_CLEAR(DTR);
+} /* end gdbstub_tx_char() */
+
+/*****************************************************************************/
+/*
+ * send a character to the debugger
+ */
+void gdbstub_tx_flush(void)
+{
+	LSR_WAIT_FOR(TEMT);
+	LSR_WAIT_FOR(THRE);
+	FLOWCTL_CLEAR(DTR);
+} /* end gdbstub_tx_flush() */

arch/frv/kernel/gdb-io.h

+/* gdb-io.h: FR403 GDB I/O port defs
+ *
+ * Copyright (C) 2003 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _GDB_IO_H
+#define _GDB_IO_H
+
+#include <asm/serial-regs.h>
+
+#undef UART_RX
+#undef UART_TX
+#undef UART_DLL
+#undef UART_DLM
+#undef UART_IER
+#undef UART_IIR
+#undef UART_FCR
+#undef UART_LCR
+#undef UART_MCR
+#undef UART_LSR
+#undef UART_MSR
+#undef UART_SCR
+
+#define UART_RX		0*8	/* In:  Receive buffer (DLAB=0) */
+#define UART_TX		0*8	/* Out: Transmit buffer (DLAB=0) */
+#define UART_DLL	0*8	/* Out: Divisor Latch Low (DLAB=1) */
+#define UART_DLM	1*8	/* Out: Divisor Latch High (DLAB=1) */
+#define UART_IER	1*8	/* Out: Interrupt Enable Register */
+#define UART_IIR	2*8	/* In:  Interrupt ID Register */
+#define UART_FCR	2*8	/* Out: FIFO Control Register */
+#define UART_LCR	3*8	/* Out: Line Control Register */
+#define UART_MCR	4*8	/* Out: Modem Control Register */
+#define UART_LSR	5*8	/* In:  Line Status Register */
+#define UART_MSR	6*8	/* In:  Modem Status Register */
+#define UART_SCR	7*8	/* I/O: Scratch Register */
+
+#define UART_LCR_DLAB	0x80	/* Divisor latch access bit */
+#define UART_LCR_SBC	0x40	/* Set break control */
+#define UART_LCR_SPAR	0x20	/* Stick parity (?) */
+#define UART_LCR_EPAR	0x10	/* Even parity select */
+#define UART_LCR_PARITY	0x08	/* Parity Enable */
+#define UART_LCR_STOP	0x04	/* Stop bits: 0=1 stop bit, 1= 2 stop bits */
+#define UART_LCR_WLEN5  0x00	/* Wordlength: 5 bits */
+#define UART_LCR_WLEN6  0x01	/* Wordlength: 6 bits */
+#define UART_LCR_WLEN7  0x02	/* Wordlength: 7 bits */
+#define UART_LCR_WLEN8  0x03	/* Wordlength: 8 bits */
+
+
+#endif /* _GDB_IO_H */

arch/frv/kernel/head.inc

+/* head.inc: head common definitions -*- asm -*-
+ *
+ * Copyright (C) 2004 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+
+#if defined(CONFIG_MB93090_MB00)
+#define LED_ADDR (0x21200000+4)
+
+.macro LEDS val
+	sethi.p		%hi(0xFFC00030),gr3
+	setlo		%lo(0xFFC00030),gr3
+	lduh		@(gr3,gr0),gr3
+	andicc		gr3,#0x100,gr0,icc0
+	bne		icc0,0,999f
+
+	setlos		#~\val,gr3
+	st		gr3,@(gr30,gr0)
+	membar
+	dcf		@(gr30,gr0)
+    999:
+.endm
+
+#elif defined(CONFIG_MB93093_PDK)
+#define LED_ADDR (0x20000023)
+
+.macro LEDS val
+	setlos		#\val,gr3
+	stb		gr3,@(gr30,gr0)
+	membar
+.endm
+
+#else
+#define LED_ADDR 0
+
+.macro LEDS val
+.endm
+#endif
+
+#ifdef CONFIG_MMU
+__sdram_base = 0x00000000		/* base address to which SDRAM relocated */
+#else
+__sdram_base = 0xc0000000		/* base address to which SDRAM relocated */
+#endif