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Patches by Scott McNutt, 24 Aug 2004:

Browse Source 
- Add support for Altera Nios-II processors.
- Add support for Psyent PCI-5441 board.
- Add support for Psyent PK1C20 board.
This commit is contained in:
wdenk
2004-10-10 21:27:30 +00:00
parent 03f5c55021
commit 5c952cf024
65 changed files with 3860 additions and 171 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
cpu/mpc85xx/pci.c
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@@ -114,7 +114,6 @@ pci_mpc85xx_init(struct pci_controller *hose)
PCI_HEADER_TYPE,
&header_type);
}
#endif
hose->last_busno = pci_hose_scan(hose);

44
cpu/nios2/Makefile Normal file
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@@ -0,0 +1,44 @@
#
# (C) Copyright 2000
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
include $(TOPDIR)/config.mk
LIB = lib$(CPU).a
START = start.o
AOBJS = exceptions.o
OBJS = cpu.o interrupts.o serial.o traps.o
all: .depend $(START) $(LIB)
$(LIB): $(OBJS) $(AOBJS)
$(AR) crv $@ $(OBJS) $(AOBJS)
#########################################################################
.depend: Makefile $(START:.o=.S) $(OBJS:.o=.c) $(AOBJS:.o=.S)
$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) $(AOBJS:.o=.S) > $@
sinclude .depend
#########################################################################

24
cpu/nios2/config.mk Normal file
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@@ -0,0 +1,24 @@
#
# (C) Copyright 2000
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
PLATFORM_RELFLAGS +=

62
cpu/nios2/cpu.c Normal file
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@@ -0,0 +1,62 @@
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <nios2.h>
#include <nios2-io.h>
#if defined (CFG_NIOS_SYSID_BASE)
#include <linux/time.h>
static void check_sysid (void)
{
struct nios_sysid_t *sysid =
(struct nios_sysid_t *)CACHE_BYPASS(CFG_NIOS_SYSID_BASE);
struct tm t;
char asc[32];
localtime_r ((time_t *)&sysid->timestamp, &t);
asctime_r (&t, asc);
printf ("SYSID : %08x, %s", sysid->id, asc);
}
#endif /* CFG_NIOS_SYSID_BASE */
int checkcpu (void)
{
printf ("CPU : Nios-II\n");
#if !defined(CFG_NIOS_SYSID_BASE)
printf ("SYSID : <unknown>\n");
#else
check_sysid ();
#endif
return (0);
}
int do_reset (void)
{
void (*rst)(void) = (void(*)(void))CFG_RESET_ADDR;
disable_interrupts ();
rst();
return(0);
}

152
cpu/nios2/exceptions.S Normal file
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@@ -0,0 +1,152 @@
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <asm/opcodes.h>
.text
.align 4
.global _exception
_exception:
/* SAVE ALL REGS -- this allows trap and unimplemented
* instruction handlers to be coded conveniently in C
*/
addi sp, sp, -(33*4)
stw r0, 0(sp)
stw r1, 4(sp)
stw r2, 8(sp)
stw r3, 12(sp)
stw r4, 16(sp)
stw r5, 20(sp)
stw r6, 24(sp)
stw r7, 28(sp)
stw r8, 32(sp)
stw r9, 36(sp)
stw r10, 40(sp)
stw r11, 44(sp)
stw r12, 48(sp)
stw r13, 52(sp)
stw r14, 56(sp)
stw r15, 60(sp)
stw r16, 64(sp)
stw r17, 68(sp)
stw r19, 72(sp)
stw r19, 76(sp)
stw r20, 80(sp)
stw r21, 84(sp)
stw r22, 88(sp)
stw r23, 92(sp)
stw r24, 96(sp)
stw r25, 100(sp)
stw r26, 104(sp)
stw r27, 108(sp)
stw r28, 112(sp)
stw r29, 116(sp)
stw r30, 120(sp)
stw r31, 124(sp)
rdctl et, estatus
stw et, 128(sp)
/* If interrupts are disabled -- software interrupt */
rdctl et, estatus
andi et, et, 1
beq et, r0, 0f
/* If no interrupts are pending -- software interrupt */
rdctl et, ipending
beq et, r0, 0f
/* HARDWARE INTERRUPT: Call interrupt handler */
movhi r3, %hi(external_interrupt)
ori r3, r3, %lo(external_interrupt)
mov r4, sp /* ptr to regs */
callr r3
/* Return address fixup: execution resumes by re-issue of
* interrupted instruction at ea-4 (ea == r29). Here we do
* simple fixup to allow common exception return.
*/
ldw r3, 116(sp)
addi r3, r3, -4
stw r3, 116(sp)
br _exception_return
0:
/* TRAP EXCEPTION */
movhi r3, %hi(OPC_TRAP)
ori r3, r3, %lo(OPC_TRAP)
addi r1, ea, -4
ldw r1, 0(r1)
bne r1, r3, 1f
movhi r3, %hi(trap_handler)
ori r3, r3, %lo(trap_handler)
mov r4, sp /* ptr to regs */
callr r3
br _exception_return
1:
/* UNIMPLEMENTED INSTRUCTION EXCEPTION */
movhi r3, %hi(soft_emulation)
ori r3, r3, %lo(soft_emulation)
mov r4, sp /* ptr to regs */
callr r3
/* Restore regsisters and return from exception*/
_exception_return:
ldw r1, 4(sp)
ldw r2, 8(sp)
ldw r3, 12(sp)
ldw r4, 16(sp)
ldw r5, 20(sp)
ldw r6, 24(sp)
ldw r7, 28(sp)
ldw r8, 32(sp)
ldw r9, 36(sp)
ldw r10, 40(sp)
ldw r11, 44(sp)
ldw r12, 48(sp)
ldw r13, 52(sp)
ldw r14, 56(sp)
ldw r15, 60(sp)
ldw r16, 64(sp)
ldw r17, 68(sp)
ldw r19, 72(sp)
ldw r19, 76(sp)
ldw r20, 80(sp)
ldw r21, 84(sp)
ldw r22, 88(sp)
ldw r23, 92(sp)
ldw r24, 96(sp)
ldw r25, 100(sp)
ldw r26, 104(sp)
ldw r27, 108(sp)
ldw r28, 112(sp)
ldw r29, 116(sp)
ldw r30, 120(sp)
ldw r31, 124(sp)
addi sp, sp, (33*4)
eret
/*-------------------------------------------------------------*/

229
cpu/nios2/interrupts.c Normal file
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@@ -0,0 +1,229 @@
/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <nios2.h>
#include <nios2-io.h>
#include <asm/ptrace.h>
#include <common.h>
#include <command.h>
#include <watchdog.h>
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#endif
#if defined(CFG_NIOS_TMRBASE) && !defined(CFG_NIOS_TMRIRQ)
#error CFG_NIOS_TMRIRQ not defined (see documentation)
#endif
/****************************************************************************/
struct irq_action {
interrupt_handler_t *handler;
void *arg;
int count;
};
static struct irq_action vecs[32];
/*************************************************************************/
volatile ulong timestamp = 0;
void reset_timer (void)
{
timestamp = 0;
}
ulong get_timer (ulong base)
{
WATCHDOG_RESET ();
return (timestamp - base);
}
void set_timer (ulong t)
{
timestamp = t;
}
/* The board must handle this interrupt if a timer is not
* provided.
*/
#if defined(CFG_NIOS_TMRBASE)
void tmr_isr (void *arg)
{
nios_timer_t *tmr = (nios_timer_t *)arg;
/* Interrupt is cleared by writing anything to the
* status register.
*/
tmr->status = 0;
timestamp += CFG_NIOS_TMRMS;
#ifdef CONFIG_STATUS_LED
status_led_tick(timestamp);
#endif
}
static void tmr_init (void)
{
nios_timer_t *tmr =(nios_timer_t *)CACHE_BYPASS(CFG_NIOS_TMRBASE);
tmr->control &= ~(NIOS_TIMER_START | NIOS_TIMER_ITO);
tmr->control |= NIOS_TIMER_STOP;
#if defined(CFG_NIOS_TMRCNT)
tmr->periodl = CFG_NIOS_TMRCNT & 0xffff;
tmr->periodh = (CFG_NIOS_TMRCNT >> 16) & 0xffff;
#endif
tmr->control |= ( NIOS_TIMER_ITO |
NIOS_TIMER_CONT |
NIOS_TIMER_START );
irq_install_handler (CFG_NIOS_TMRIRQ, tmr_isr, (void *)tmr);
}
#endif /* CFG_NIOS_TMRBASE */
/*************************************************************************/
int disable_interrupts (void)
{
int val = rdctl (CTL_STATUS);
wrctl (CTL_STATUS, val & ~STATUS_IE);
return (val & STATUS_IE);
}
void enable_interrupts( void )
{
int val = rdctl (CTL_STATUS);
wrctl (CTL_STATUS, val | STATUS_IE);
}
void external_interrupt (struct pt_regs *regs)
{
unsigned irqs;
struct irq_action *act;
/* Evaluate only irqs that are both enabled AND pending */
irqs = rdctl (CTL_IENABLE) & rdctl (CTL_IPENDING);
act = vecs;
/* Assume (as does the Nios2 HAL) that bit 0 is highest
* priority. NOTE: There is ALWAYS a handler assigned
* (the default if no other).
*/
while (irqs) {
if (irqs & 1) {
act->handler (act->arg);
act->count++;
}
irqs >>=1;
act++;
}
}
static void def_hdlr (void *arg)
{
unsigned irqs = rdctl (CTL_IENABLE);
/* Disable the individual interrupt -- with gratuitous
* warning.
*/
irqs &= ~(1 << (int)arg);
wrctl (CTL_IENABLE, irqs);
printf ("WARNING: Disabling unhandled interrupt: %d\n",
(int)arg);
}
/*************************************************************************/
void irq_install_handler (int irq, interrupt_handler_t *hdlr, void *arg)
{
int flag;
struct irq_action *act;
unsigned ena = rdctl (CTL_IENABLE);
if ((irq < 0) || (irq > 31))
return;
act = &vecs[irq];
flag = disable_interrupts ();
if (hdlr) {
act->handler = hdlr;
act->arg = arg;
ena |= (1 << irq); /* enable */
} else {
act->handler = def_hdlr;
act->arg = (void *)irq;
ena &= ~(1 << irq); /* disable */
}
wrctl (CTL_IENABLE, ena);
if (flag) enable_interrupts ();
}
int interrupt_init (void)
{
int i;
/* Assign the default handler to all */
for (i = 0; i < 32; i++) {
vecs[i].handler = def_hdlr;
vecs[i].arg = (void *)i;
vecs[i].count = 0;
}
#if defined(CFG_NIOS_TMRBASE)
tmr_init ();
#endif
enable_interrupts ();
return (0);
}
/*************************************************************************/
#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
int i;
struct irq_action *act = vecs;
printf ("\nInterrupt-Information:\n\n");
printf ("Nr Routine Arg Count\n");
printf ("-----------------------------\n");
for (i=0; i<32; i++) {
if (act->handler != def_hdlr) {
printf ("%02d %08lx %08lx %d\n",
i,
(ulong)act->handler,
(ulong)act->arg,
act->count);
}
act++;
}
printf ("\n");
return (0);
}
#endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */

144
cpu/nios2/serial.c Normal file
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@@ -0,0 +1,144 @@
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <watchdog.h>
#include <nios2.h>
#include <nios2-io.h>
/*------------------------------------------------------------------
* JTAG acts as the serial port
*-----------------------------------------------------------------*/
#if defined(CONFIG_CONSOLE_JTAG)
static nios_jtag_t *jtag =
(nios_jtag_t *)CACHE_BYPASS(CFG_NIOS_CONSOLE);
void serial_setbrg( void ){ return; }
int serial_init( void ) { return(0);}
void serial_putc (char c)
{
unsigned val;
while (NIOS_JTAG_WSPACE (jtag->control) == 0)
WATCHDOG_RESET ();
jtag->data = (unsigned char)c;
}
void serial_puts (const char *s)
{
while (*s != 0)
serial_putc (*s++);
}
int serial_tstc (void)
{
return (jtag->control & NIOS_JTAG_RRDY);
}
int serial_getc (void)
{
int c;
unsigned val;
while (1) {
WATCHDOG_RESET ();
val = jtag->data;
if (val & NIOS_JTAG_RVALID)
break;
}
c = val & 0x0ff;
return (c);
}
/*------------------------------------------------------------------
* UART the serial port
*-----------------------------------------------------------------*/
#else
static nios_uart_t *uart = (nios_uart_t *)
CACHE_BYPASS(CFG_NIOS_CONSOLE);
#if defined(CFG_NIOS_FIXEDBAUD)
/* Everything's already setup for fixed-baud PTF
* assignment
*/
void serial_setbrg (void){ return; }
int serial_init (void) { return (0);}
#else
void serial_setbrg (void)
{
DECLARE_GLOBAL_DATA_PTR;
unsigned div;
div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
uart->divisor = div;
return;
}
int serial_init (void)
{
serial_setbrg ();
return (0);
}
#endif /* CFG_NIOS_FIXEDBAUD */
/*-----------------------------------------------------------------------
* UART CONSOLE
*---------------------------------------------------------------------*/
void serial_putc (char c)
{
if (c == '\n')
serial_putc ('\r');
while ((uart->status & NIOS_UART_TRDY) == 0)
WATCHDOG_RESET ();
uart->txdata = (unsigned char)c;
}
void serial_puts (const char *s)
{
while (*s != 0) {
serial_putc (*s++);
}
}
int serial_tstc (void)
{
return (uart->status & NIOS_UART_RRDY);
}
int serial_getc (void)
{
while (serial_tstc () == 0)
WATCHDOG_RESET ();
return( uart->rxdata & 0x00ff );
}
#endif /* CONFIG_JTAG_CONSOLE */

211
cpu/nios2/start.S Normal file
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@@ -0,0 +1,211 @@
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <version.h>
/*************************************************************************
* RESTART
************************************************************************/
.text
.global _start
_start:
/* ICACHE INIT -- only the icache line at the reset address
* is invalidated at reset. So the init must stay within
* the cache line size (8 words). If GERMS is used, we'll
* just be invalidating the cache a second time. If cache
* is not implemented initi behaves as nop.
*/
movhi r4, %hi(CFG_ICACHELINE_SIZE)
ori r4, r4, %lo(CFG_ICACHELINE_SIZE)
movhi r5, %hi(CFG_ICACHE_SIZE)
ori r5, r5, %lo(CFG_ICACHE_SIZE)
mov r6, r0
0: initi r6
add r6, r6, r4
bltu r6, r5, 0b
/* INTERRUPTS -- for now, all interrupts masked and globally
* disabled.
*/
wrctl status, r0 /* Disable interrupts */
wrctl ienable, r0 /* All disabled */
/* DCACHE INIT -- if dcache not implemented, initd behaves as
* nop.
*/
movhi r4, %hi(CFG_DCACHELINE_SIZE)
ori r4, r4, %lo(CFG_DCACHELINE_SIZE)
movhi r5, %hi(CFG_DCACHE_SIZE)
ori r5, r5, %lo(CFG_DCACHE_SIZE)
mov r6, r0
1: initd 0(r6)
add r6, r6, r4
bltu r6, r5, 1b
/* RELOCATE CODE, DATA & COMMAND TABLE -- the following code
* assumes code, data and the command table are all
* contiguous. This lets us relocate everything as a single
* block. Make sure the linker script matches this ;-)
*/
nextpc r4
_cur: movhi r5, %hi(_cur - _start)
ori r5, r5, %lo(_cur - _start)
sub r4, r4, r5 /* r4 <- cur _start */
mov r8, r4
movhi r5, %hi(_start)
ori r5, r5, %lo(_start) /* r5 <- linked _start */
beq r4, r5, 3f
movhi r6, %hi(_edata)
ori r6, r6, %lo(_edata)
2: ldwio r7, 0(r4)
addi r4, r4, 4
stwio r7, 0(r5)
addi r5, r5, 4
bne r5, r6, 2b
3:
/* ZERO BSS/SBSS -- bss and sbss are assumed to be adjacent
* and between __bss_start and _end.
*/
movhi r5, %hi(__bss_start)
ori r5, r5, %lo(__bss_start)
movhi r6, %hi(_end)
ori r6, r6, %lo(_end)
beq r5, r6, 5f
4: stwio r0, 0(r5)
addi r5, r5, 4
bne r5, r6, 4b
5:
/* GLOBAL POINTER -- the global pointer is used to reference
* "small data" (see -G switch). The linker script must
* provide the gp address.
*/
movhi gp, %hi(_gp)
ori gp, gp, %lo(_gp)
/* JUMP TO RELOC ADDR */
movhi r4, %hi(_reloc)
ori r4, r4, %lo(_reloc)
jmp r4
_reloc:
/* COPY EXCEPTION TRAMPOLINE -- copy the tramp to the
* exception address.
*/
#if !defined(CONFIG_ROM_STUBS)
movhi r4, %hi(_except_start)
ori r4, r4, %lo(_except_start)
movhi r5, %hi(_except_end)
ori r5, r5, %lo(_except_end)
movhi r6, %hi(CFG_EXCEPTION_ADDR)
ori r6, r6, %lo(CFG_EXCEPTION_ADDR)
6: ldwio r7, 0(r4)
stwio r7, 0(r6)
addi r4, r4, 4
addi r6, r6, 4
bne r4, r5, 6b
#endif
/* STACK INIT -- zero top two words for call back chain.
*/
movhi sp, %hi(CFG_INIT_SP)
ori sp, sp, %lo(CFG_INIT_SP)
addi sp, sp, -8
stw r0, 0(sp)
stw r0, 4(sp)
mov fp, sp
/*
* Call board_init -- never returns
*/
movhi r4, %hi(board_init@h)
ori r4, r4, %lo(board_init@h)
callr r4
/* NEVER RETURNS -- but branch to the _start just
* in case ;-)
*/
br _start
/* EXCEPTION TRAMPOLINE -- the following gets copied
* to the exception address.
*/
_except_start:
movhi et, %hi(_exception)
ori et, et, %lo(_exception)
jmp et
_except_end:
/*
* dly_clks -- Nios2 (like Nios1) doesn't have a timebase in
* the core. For simple delay loops, we do our best by counting
* instruction cycles.
*
* Instruction performance varies based on the core. For cores
* with icache and static/dynamic branch prediction (II/f, II/s):
*
* Normal ALU (e.g. add, cmp, etc): 1 cycle
* Branch (correctly predicted, taken): 2 cycles
* Negative offset is predicted (II/s).
*
* For cores without icache and no branch prediction (II/e):
*
* Normal ALU (e.g. add, cmp, etc): 6 cycles
* Branch (no prediction): 6 cycles
*
* For simplicity, if an instruction cache is implemented we
* assume II/f or II/s. Otherwise, we use the II/e.
*
*/
.globl dly_clks
dly_clks:
#if (CFG_ICACHE_SIZE > 0)
subi r4, r4, 3 /* 3 clocks/loop */
#else
subi r4, r4, 12 /* 12 clocks/loop */
#endif
bge r4, r0, dly_clks
ret
#if !defined(CONFIG_IDENT_STRING)
#define CONFIG_IDENT_STRING ""
#endif
.data
.globl version_string
version_string:
.ascii U_BOOT_VERSION
.ascii " (", __DATE__, " - ", __TIME__, ")"
.ascii CONFIG_IDENT_STRING, "\0"

42
cpu/nios2/traps.c Normal file
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@@ -0,0 +1,42 @@
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm/ptrace.h>
#include <common.h>
void trap_handler (struct pt_regs *regs)
{
/* Just issue warning */
printf ("\n\n*** WARNING: unimplemented trap @ %08x\n\n",
regs->reg[29] - 4);
}
void soft_emulation (struct pt_regs *regs)
{
/* TODO: Software emulation of mul/div etc. Until this is
* implemented, generate warning and hang.
*/
printf ("\n\n*** ERROR: unimplemented instruction @ %08x\n",
regs->reg[29] - 4);
hang ();
}