/*
** bootstrap.c -- This program loads the Linux/68k kernel into an Amiga
** and and launches it.
**
** Copyright 1993,1994 by Hamish Macdonald, Greg Harp
**
** Modified 11-May-94 by Geert Uytterhoeven
** (Geert.Uytterhoeven@cs.kuleuven.ac.be)
** - A3640 MapROM check
** Modified 31-May-94 by Geert Uytterhoeven
** - Memory thrash problem solved
** Modified 07-March-95 by Geert Uytterhoeven
** - Memory block sizes are rounded to a multiple of 256K instead of 1M
** This _requires_ >0.9pl5 to work!
** (unless all block sizes are multiples of 1M :-)
**
** This file is subject to the terms and conditions of the GNU General Public
** License. See the file COPYING in the main directory of this archive
** for more details.
**
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/file.h>
#include <sys/types.h>
#include <unistd.h>
/* Amiga bootstrap include file */
#include "bootstrap.h"
/* required Linux/68k include files */
#include <linux/a.out.h>
#include <asm/bootinfo.h>
/* temporary stack size */
#define TEMP_STACKSIZE 256
/* Exec Base */
extern struct ExecBase *SysBase;
extern char *optarg;
struct exec kexec;
char *memptr;
u_long start_mem;
u_long mem_size;
u_long rd_size;
struct ExpansionBase *ExpansionBase;
struct GfxBase *GfxBase;
struct bootinfo bi;
u_long bi_size = sizeof bi;
caddr_t CustomBase = (caddr_t)CUSTOM_PHYSADDR;
void usage(void)
{
fprintf (stderr, "Usage:\n"
"\tbootstrap [-d] [-k kernel_executable] [-r ramdisk_file]"
" [option...]\n");
exit (EXIT_FAILURE);
}
/*
* This assembler code is copied to chip ram, and
* then executed.
* It copies the kernel (and ramdisk) to their
* final resting place.
*/
#ifndef __GNUC__
#error GNU CC is required to compile the bootstrap program
#endif
asm("
.text
.globl _copyall, _copyallend
_copyall:
| /* put variables in registers because they may */
lea _kexec,a3 | /* be overwritten by kernel/ramdisk copy!! - G.U. */
movel _memptr,a4
movel _start_mem,a5
movel _mem_size,d0
movel _rd_size,d1
movel _bi_size,d5
movel a3@(4),d2 | kexec.a_text
movel a3@(8),d3 | kexec.a_data
movel a3@(12),d4 | kexec.a_bss
| /* copy kernel text and data */
movel a4,a0 | src = (u_long *)memptr;
movel a0,a2 | limit = (u_long *)(memptr + kexec.a_text + kexec.a_data);
addl d2,a2
addl d3,a2
movel a5,a1 | dest = (u_long *)start_mem;
1: cmpl a0,a2
beqs 2f | while (src < limit)
moveb a0@+,a1@+ | *dest++ = *src++;
bras 1b
2:
| /* clear kernel bss */
movel a1,a0 | dest = (u_long *)(start_mem + kexec.a_text + kexec.a_data);
movel a1,a2 | limit = dest + kexec.a_bss / sizeof(u_long);
addl d4,a2
1: cmpl a0,a2
beqs 2f | while (dest < limit)
clrb a0@+ | *dest++ = 0;
bras 1b
2:
| /* copy bootinfo to end of bss */
movel a4,a1 | src = (u long *)memptr + kexec.a_text + kexec.a_data);
addl d2,a1
addl d3,a1 | dest = end of bss (already in a0)
movel d5,d7 | count = sizeof bi
subql #1,d7
1: moveb a1@+,a0@+ | while (--count > -1)
dbra d7,1b | *dest++ = *src++
| /* copy the ramdisk to the top of memory (from back to front) */
movel a5,a1 | dest = (u_long *)(start_mem + mem_size);
addl d0,a1
movel a4,a2 | limit = (u_long *)(memptr + kexec.a_text + kexec.a_data + sizeof bi);
addl d2,a2
addl d3,a2
addl d5,a2
movel a2,a0 | src = (u_long *)((u_long)limit + rd_size);
addl d1,a0
1: cmpl a0,a2
beqs 2f | while (src > limit)
moveb a0@-,a1@- | *--dest = *--src;
bras 1b
2:
| /* jump to start of kernel */
movel a5,a0 | jump_to (START_MEM);
jsr a0@
_copyallend:
");
asm("
.text
.globl _maprommed
_maprommed:
oriw #0x0700,sr
moveml #0x3f20,sp@-
/* Save cache settings */
.long 0x4e7a1002 /* movec cacr,d1 */
/* Save MMU settings */
.long 0x4e7a2003 /* movec tc,d2 */
.long 0x4e7a3004 /* movec itt0,d3 */
.long 0x4e7a4005 /* movec itt1,d4 */
.long 0x4e7a5006 /* movec dtt0,d5 */
.long 0x4e7a6007 /* movec dtt1,d6 */
moveq #0,d0
movel d0,a2
/* Disable caches */
.long 0x4e7b0002 /* movec d0,cacr */
/* Disable MMU */
.long 0x4e7b0003 /* movec d0,tc */
.long 0x4e7b0004 /* movec d0,itt0 */
.long 0x4e7b0005 /* movec d0,itt1 */
.long 0x4e7b0006 /* movec d0,dtt0 */
.long 0x4e7b0007 /* movec d0,dtt1 */
lea 0x07f80000,a0
lea 0x00f80000,a1
movel a0@,d7
cmpl a1@,d7
jnes 1f
movel d7,d0
notl d0
movel d0,a0@
nop
cmpl a1@,d0
jnes 1f
/* MapROMmed A3640 present */
moveq #-1,d0
movel d0,a2
1: movel d7,a0@
/* Restore MMU settings */
.long 0x4e7b2003 /* movec d2,tc */
.long 0x4e7b3004 /* movec d3,itt0 */
.long 0x4e7b4005 /* movec d4,itt1 */
.long 0x4e7b5006 /* movec d5,dtt0 */
.long 0x4e7b6007 /* movec d6,dtt1 */
/* Restore cache settings */
.long 0x4e7b1002 /* movec d1,cacr */
movel a2,d0
moveml sp@+,#0x04fc
rte
");
extern unsigned long maprommed();
extern char copyall, copyallend;
int main(int argc, char *argv[])
{
int ch, debugflag = 0, kfd, rfd = -1, i;
long fast_total = 0; /* total Fast RAM in system */
struct MemHeader *mnp;
struct ConfigDev *cdp = NULL;
char *kernel_name = "vmlinux";
char *ramdisk_name = NULL;
char *memfile = NULL;
u_long memreq;
void (*startfunc)(void);
long startcodesize;
u_long *stack, text_offset;
unsigned char *rb3_reg = NULL, *piccolo_reg = NULL, *sd64_reg = NULL;
/* print the greet message */
puts(" Linux/68k Amiga Bootstrap version 1.11");
puts("Copyright 1993,1994 by Hamish Macdonald and Greg Harp\n");
/* machine is Amiga */
bi.machtype = MACH_AMIGA;
/* check arguments */
while ((ch = getopt(argc, argv, "dk:r:m:")) != EOF)
switch (ch) {
case 'd':
debugflag = 1;
break;
case 'k':
kernel_name = optarg;
break;
case 'r':
ramdisk_name = optarg;
break;
case 'm':
memfile = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
SysBase = *(struct ExecBase **)4;
/* Memory & AutoConfig based on 'unix_boot.c' by C= */
/* open Expansion Library */
ExpansionBase = (struct ExpansionBase *)OpenLibrary("expansion.library", 36);
if (!ExpansionBase) {
puts("Unable to open expansion.library V36 or greater! Aborting...");
exit(EXIT_FAILURE);
}
/* find all of the autoconfig boards in the system */
cdp = (struct ConfigDev *)FindConfigDev(cdp, -1, -1);
for (i=0; (i < NUM_AUTO) && cdp; i++) {
/* copy the contents of each structure into our boot info */
memcpy(&bi.bi_amiga.autocon[i], cdp, sizeof(struct ConfigDev));
/* count this device */
bi.bi_amiga.num_autocon++;
/* get next device */
cdp = (struct ConfigDev *)FindConfigDev(cdp, -1, -1);
}
/* find out the memory in the system */
for (mnp = (struct MemHeader *)SysBase->MemList.l_head;
(bi.num_memory < NUM_MEMINFO) && mnp->mh_Node.ln_Succ;
mnp = (struct MemHeader *)mnp->mh_Node.ln_Succ)
{
struct MemHeader mh;
/* copy the information */
mh = *mnp;
/* if we suspect that Kickstart is shadowed in an A3000,
modify the entry to show 512K more at the top of RAM
Check first for a MapROMmed A3640 board: overwriting the
Kickstart image causes an infinite lock-up on reboot! */
if (mh.mh_Upper == (void *)0x07f80000)
if ((SysBase->AttnFlags & AFF_68040) && Supervisor(maprommed))
printf("A3640 MapROM detected.\n");
else {
mh.mh_Upper = (void *)0x08000000;
printf("A3000 shadowed Kickstart detected.\n");
}
/* if we suspect that Kickstart is zkicked,
modify the entry to show 512K more at the bottom of RAM */
if (mh.mh_Lower == (void *)0x00280020) {
mh.mh_Lower = (void *)0x00200000;
printf("ZKick detected.\n");
}
/*
* If this machine has "LOCAL" memory between 0x07000000
* and 0x080000000, then we'll call it an A3000.
*/
if (mh.mh_Lower >= (void *)0x07000000 &&
mh.mh_Lower < (void *)0x08000000 &&
(mh.mh_Attributes & MEMF_LOCAL))
bi.bi_amiga.model = AMI_3000;
/* mask the memory limit values */
mh.mh_Upper = (void *)((u_long)mh.mh_Upper & 0xfffff000);
mh.mh_Lower = (void *)((u_long)mh.mh_Lower & 0xfffff000);
/* if fast memory */
if (mh.mh_Attributes & MEMF_FAST) {
unsigned long size;
/* record the start */
bi.memory[bi.num_memory].addr = (u_long)mh.mh_Lower;
/* set the size value to the size of this block */
size = (u_long)mh.mh_Upper - (u_long)mh.mh_Lower;
/* mask off to a 256K increment */
size &= 0xfffc0000;
fast_total += size;
if (size > 0)
/* count this block */
bi.memory[bi.num_memory++].size = size;
} else if (mh.mh_Attributes & MEMF_CHIP) {
/* if CHIP memory, record the size */
bi.bi_amiga.chip_size =
(u_long)mh.mh_Upper; /* - (u_long)mh.mh_Lower; */
}
}
CloseLibrary((struct Library *)ExpansionBase);
/*
* if we have a memory file, read the memory information from it
*/
if (memfile) {
FILE *fp;
int i;
if ((fp = fopen (memfile, "r")) == NULL) {
perror ("open memory file");
fprintf (stderr, "Cannot open memory file %s\n", memfile);
exit (EXIT_FAILURE);
}
if (fscanf (fp, "%lu", &bi.bi_amiga.chip_size) != 1) {
fprintf (stderr, "memory file does not contain chip memory size\n");
fclose (fp);
exit (EXIT_FAILURE);
}
for (i = 0; i < NUM_MEMINFO; i++) {
if (fscanf (fp, "%lx %lu", &bi.memory[i].addr,
&bi.memory[i].size) != 2)
break;
}
fclose (fp);
if (i != bi.num_memory && i > 0)
bi.num_memory = i;
}
/* get info from ExecBase */
bi.bi_amiga.vblank = SysBase->VBlankFrequency;
bi.bi_amiga.psfreq = SysBase->PowerSupplyFrequency;
bi.bi_amiga.eclock = SysBase->EClockFrequency;
/* open graphics library */
GfxBase = (struct GfxBase *)OpenLibrary ("graphics.library", 0);
/* determine chipset */
bi.bi_amiga.chipset = CS_STONEAGE;
if(GfxBase)
{
if(GfxBase->ChipRevBits0 & GFXG_AGA)
{
bi.bi_amiga.chipset = CS_AGA;
/*
* we considered this machine to be an A3000 because of its
* local memory just beneath $8000000; now if it has AGA, it
* must be an A4000
* except the case no RAM is installed on the motherboard but
* on an additional card like FastLane Z3 or on the processor
* board itself. Gotta check this out.
*/
bi.bi_amiga.model =
(bi.bi_amiga.model == AMI_3000) ? AMI_4000 : AMI_1200;
}
else if(GfxBase->ChipRevBits0 & GFXG_ECS)
bi.bi_amiga.chipset = CS_ECS;
else if(GfxBase->ChipRevBits0 & GFXG_OCS)
bi.bi_amiga.chipset = CS_OCS;
}
/* Display amiga model */
switch (bi.bi_amiga.model) {
case AMI_UNKNOWN:
break;
case AMI_500:
printf ("Amiga 500 ");
break;
case AMI_2000:
printf ("Amiga 2000 ");
break;
case AMI_3000:
printf ("Amiga 3000 ");
break;
case AMI_4000:
printf ("Amiga 4000 ");
break;
case AMI_1200: /* this implies an upgraded model */
printf ("Amiga 1200 "); /* equipped with at least 68030 !!! */
break;
}
/* display and set the CPU <type */
printf("CPU: ");
if (SysBase->AttnFlags & AFF_68040) {
printf("68040");
bi.cputype = CPU_68040;
if (SysBase->AttnFlags & AFF_FPU40) {
printf(" with internal FPU");
bi.cputype |= FPU_68040;
} else
printf(" without FPU");
} else {
if (SysBase->AttnFlags & AFF_68030) {
printf("68030");
bi.cputype = CPU_68030;
} else if (SysBase->AttnFlags & AFF_68020) {
printf("68020 (Do you have an MMU?)");
bi.cputype = CPU_68020;
} else {
puts("Insufficient for Linux. Aborting...");
printf("SysBase->AttnFlags = %#x\n", SysBase->AttnFlags);
exit (EXIT_FAILURE);
}
if (SysBase->AttnFlags & AFF_68882) {
printf(" with 68882 FPU");
bi.cputype |= FPU_68882;
} else if (SysBase->AttnFlags & AFF_68881) {
printf(" with 68881 FPU");
bi.cputype |= FPU_68881;
} else
printf(" without FPU");
}
switch(bi.bi_amiga.chipset)
{
case CS_STONEAGE:
printf(", old or unknown chipset");
break;
case CS_OCS:
printf(", OCS");
break;
case CS_ECS:
printf(", ECS");
break;
case CS_AGA:
printf(", AGA chipset");
break;
}
putchar ('\n');
putchar ('\n');
/*
* Copy command line options into the kernel command line.
*/
i = 0;
while (argc--) {
if ((i+strlen(*argv)+1) < CL_SIZE) {
i += strlen(*argv) + 1;
if (bi.command_line[0])
strcat (bi.command_line, " ");
strcat (bi.command_line, *argv++);
}
}
printf ("Command line is '%s'\n", bi.command_line);
/* display the clock statistics */
printf("Vertical Blank Frequency: %dHz\nPower Supply Frequency: %dHz\n",
bi.bi_amiga.vblank, bi.bi_amiga.psfreq);
printf("EClock Frequency: %7.5fKHz\n\n",
(float)bi.bi_amiga.eclock / 1000);
/* display autoconfig devices */
if (bi.bi_amiga.num_autocon) {
printf("Found %d AutoConfig Device%s", bi.bi_amiga.num_autocon,
(bi.bi_amiga.num_autocon > 1)?"s\n":"\n");
for (i=0; i<bi.bi_amiga.num_autocon; i++)
{
printf("Device %d: addr = %08lx\n", i,
(u_long)bi.bi_amiga.autocon[i].cd_BoardAddr);
/* check for a Rainbow 3 and prepare to reset it if there is one */
if ( (bi.bi_amiga.autocon[i].cd_Rom.er_Manufacturer == MANUF_HELFRICH1) &&
(bi.bi_amiga.autocon[i].cd_Rom.er_Product == PROD_RAINBOW3) )
{
printf("(Found a Rainbow 3 board - will reset it at kernel boot time)\n");
rb3_reg = (unsigned char *)(bi.bi_amiga.autocon[i].cd_BoardAddr + 0x01002000);
}
/* check for a Piccolo and prepare to reset it if there is one */
if ( (bi.bi_amiga.autocon[i].cd_Rom.er_Manufacturer == MANUF_HELFRICH2) &&
(bi.bi_amiga.autocon[i].cd_Rom.er_Product == PROD_PICCOLO_REG) )
{
printf("(Found a Piccolo board - will reset it at kernel boot time)\n");
piccolo_reg = (unsigned char *)(bi.bi_amiga.autocon[i].cd_BoardAddr + 0x8000);
}
/* check for a SD64 and prepare to reset it if there is one */
if ( (bi.bi_amiga.autocon[i].cd_Rom.er_Manufacturer == MANUF_HELFRICH2) &&
(bi.bi_amiga.autocon[i].cd_Rom.er_Product == PROD_SD64_REG) )
{
printf("(Found a SD64 board - will reset it at kernel boot time)\n");
sd64_reg = (unsigned char *)(bi.bi_amiga.autocon[i].cd_BoardAddr + 0x8000);
}
/* what this code lacks - what if there are several boards of */
/* the same brand ? In that case I should reset them one after */
/* the other, which is currently not done - a rare case...FN */
/* ok, MY amiga currently hosts all three of the above boards ;-) */
}
} else
puts("No AutoConfig Devices Found");
/* display memory */
if (bi.num_memory) {
printf("\n%d Block%sof Memory Found\n", bi.num_memory,
(bi.num_memory > 1)?"s ":" ");
for (i=0; i<bi.num_memory; i++) {
printf("Block %d: %08lx to %08lx (%ldKB)\n",
i, bi.memory[i].addr,
bi.memory[i].addr + bi.memory[i].size,
bi.memory[i].size >> 10);
}
} else {
puts("No memory found?! Aborting...");
exit(10);
}
/* display chip memory size */
printf ("%ldK of CHIP memory\n", bi.bi_amiga.chip_size >> 10);
start_mem = bi.memory[0].addr;
mem_size = bi.memory[0].size;
/* tell us where the kernel will go */
printf("\nThe kernel will be located at %08lx\n", start_mem);
/* verify that there is enough Chip RAM */
if (bi.bi_amiga.chip_size < 512*1024) {
puts("\nNot enough Chip RAM in this system. Aborting...");
exit(10);
}
/* verify that there is enough Fast RAM */
if (fast_total < 2*1024*1024) {
puts("\nNot enough Fast RAM in this system. Aborting...");
exit(10);
}
/* open kernel executable and read exec header */
if ((kfd = open (kernel_name, O_RDONLY)) == -1) {
fprintf (stderr, "Unable to open kernel file %s\n", kernel_name);
exit (EXIT_FAILURE);
}
if (read (kfd, (void *)&kexec, sizeof(kexec)) != sizeof(kexec)) {
fprintf (stderr, "Unable to read exec header from %s\n",
kernel_name);
exit (EXIT_FAILURE);
}
switch (N_MAGIC(kexec)) {
case ZMAGIC:
text_offset = N_TXTOFF(kexec);
break;
case QMAGIC:
text_offset = sizeof(kexec);
/* the text size includes the exec header; remove this */
kexec.a_text -= sizeof(kexec);
break;
default:
fprintf (stderr, "Wrong magic number %lo in kernel header\n",
N_MAGIC(kexec));
exit (EXIT_FAILURE);
}
/* Load the kernel at one page after start of mem */
start_mem += PAGE_SIZE;
mem_size -= PAGE_SIZE;
/* Align bss size to multiple of four */
kexec.a_bss = (kexec.a_bss + 3) & ~3;
if (ramdisk_name) {
if ((rfd = open (ramdisk_name, O_RDONLY)) == -1) {
fprintf (stderr, "Unable to open ramdisk file %s\n",
ramdisk_name);
exit (EXIT_FAILURE);
}
/* record ramdisk size */
bi.ramdisk_size = (lseek (rfd, 0, L_XTND) + 1023) >> 10;
} else
bi.ramdisk_size = 0;
rd_size = bi.ramdisk_size << 10;
bi.ramdisk_addr = (u_long)start_mem + mem_size - rd_size;
memreq = kexec.a_text + kexec.a_data + sizeof(bi) + rd_size;
if (!(memptr = (char *)AllocMem (memreq, MEMF_FAST | MEMF_CLEAR))) {
fprintf (stderr, "Unable to allocate memory\n");
exit (EXIT_FAILURE);
}
if (lseek (kfd, text_offset, L_SET) == -1) {
fprintf (stderr, "Failed to seek to text\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
if (read (kfd, memptr, kexec.a_text) != kexec.a_text) {
fprintf (stderr, "Failed to read text\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
/* data follows immediately after text */
if (read (kfd, memptr + kexec.a_text, kexec.a_data) != kexec.a_data) {
fprintf (stderr, "Failed to read data\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
close (kfd);
/* copy the boot_info struct to the end of the kernel image */
memcpy ((void *)(memptr + kexec.a_text + kexec.a_data), &bi,
sizeof(bi));
if (rfd != -1) {
if (lseek (rfd, 0, L_SET) == -1) {
fprintf (stderr, "Failed to seek to beginning of ramdisk file\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
if (read (rfd, memptr + kexec.a_text + kexec.a_data
+ sizeof(bi), rd_size) != rd_size) {
fprintf (stderr, "Failed to read ramdisk file\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
close (rfd);
}
/* allocate temporary chip ram stack */
stack = (u_long *)AllocMem( TEMP_STACKSIZE, MEMF_CHIP|MEMF_CLEAR);
if (!stack) {
fprintf (stderr, "Unable to allocate memory for stack\n");
FreeMem ((void *)memptr, memreq);
exit (EXIT_FAILURE);
}
/* allocate chip ram for copy of startup code */
startcodesize = ©allend - ©all;
startfunc = (void (*)(void))AllocMem( startcodesize, MEMF_CHIP);
if (!startfunc) {
fprintf (stderr, "Unable to allocate memory for code\n");
FreeMem ((void *)memptr, memreq);
FreeMem ((void *)stack, TEMP_STACKSIZE);
exit (EXIT_FAILURE);
}
/* copy startup code to CHIP RAM */
memcpy (startfunc, ©all, startcodesize);
if (debugflag) {
if (bi.ramdisk_size)
printf ("RAM disk at %#lx, size is %ldK\n",
(u_long)memptr + kexec.a_text + kexec.a_data,
bi.ramdisk_size);
printf ("\nKernel text at %#lx, code size %x\n",
start_mem, kexec.a_text);
printf ("Kernel data at %#lx, data size %x\n",
start_mem + kexec.a_text, kexec.a_data );
printf ("Kernel bss at %#lx, bss size %x\n",
start_mem + kexec.a_text + kexec.a_data,
kexec.a_bss );
printf ("boot info at %#lx\n", start_mem + kexec.a_text
+ kexec.a_data + kexec.a_bss);
printf ("\nKernel entry is %#x\n", kexec.a_entry );
printf ("ramdisk dest top is %#lx\n", start_mem + mem_size);
printf ("ramdisk lower limit is %#lx\n",
(u_long)(memptr + kexec.a_text + kexec.a_data));
printf ("ramdisk src top is %#lx\n",
(u_long)(memptr + kexec.a_text + kexec.a_data)
+ rd_size);
printf ("Type a key to continue the Linux boot...");
fflush (stdout);
getchar();
}
/* wait for things to settle down */
sleep(2);
/* FN: If a Rainbow III board is present, reset it to disable */
/* its (possibly activated) vertical blank interrupts as the */
/* kernel is not yet prepared to handle them (level 6). */
if (rb3_reg != NULL)
{
/* set RESET bit in special function register */
*rb3_reg = 0x01;
/* actually, only a few cycles delay are required... */
sleep(1);
/* clear reset bit */
*rb3_reg = 0x00;
}
/* the same stuff as above, for the Piccolo board. */
/* this also has the side effect of resetting the board's */
/* output selection logic to use the Amiga's display in single */
/* monitor systems - which is currently what we want. */
if (piccolo_reg != NULL)
{
/* set RESET bit in special function register */
*piccolo_reg = 0x01;
/* actually, only a few cycles delay are required... */
sleep(1);
/* clear reset bit */
*piccolo_reg = 0x51;
}
/* the same stuff as above, for the SD64 board. */
/* just as on the Piccolo, this also resets the monitor switch */
if (sd64_reg != NULL)
{
/* set RESET bit in special function register */
*sd64_reg = 0x1f;
/* actually, only a few cycles delay are required... */
sleep(1);
/* clear reset bit AND switch monitor bit (0x20) */
*sd64_reg = 0x4f;
}
if (GfxBase) {
/* set graphics mode to a nice normal one */
LoadView (NULL);
CloseLibrary ((struct Library *)GfxBase);
}
Disable();
/* Turn off all DMA */
custom.dmacon = DMAF_ALL | DMAF_MASTER;
/* turn off caches */
CacheControl (0L, ~0L);
/* Go into supervisor state */
SuperState ();
/* setup stack */
change_stack ((char *) stack + TEMP_STACKSIZE);
/* turn off any mmu translation */
disable_mmu ();
/* execute the copy-and-go code (from CHIP RAM) */
startfunc();
/* NOTREACHED */
}
