/* $NetBSD: bootxx.c,v 1.21 2020/01/23 17:23:03 uwe Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <powerpc/oea/bat.h>
#include <powerpc/oea/spr.h>
#include <sys/bootblock.h>
int (*openfirmware)(void *);
/*
* 32 KB of stack with 32 bytes overpad
* (see below)
*/
int32_t __attribute__((aligned(16))) stack[8192 + 8];
struct shared_bbinfo bbinfo = {
{ MACPPC_BBINFO_MAGIC },
0,
SHARED_BBINFO_MAXBLOCKS,
{ 0 }
};
#ifndef DEFAULT_ENTRY_POINT
#define DEFAULT_ENTRY_POINT 0xE00000
#endif
void (*entry_point)(int, int, void *) = (void *)DEFAULT_ENTRY_POINT;
__asm(
" .text \n"
" .align 2 \n"
" .globl _start \n"
"_start: \n"
" lis %r8,(_start)@ha \n"
" addi %r8,8,(_start)@l\n"
" li %r9,0x40 \n" /* loop 64 times (for 2048 bytes of bootxx) */
" mtctr %r9 \n"
" \n"
"1: dcbf 0,%r8 \n"
" icbi 0,%r8 \n"
" addi %r8,%r8,0x20 \n"
" bdnz 1b \n"
" sync \n"
" li %r0,0 \n"
" \n" /* test for 601 cpu */
" mfspr %r9,287 \n" /* mfpvbr %r9 PVR = 287 */
" srwi %r9,%r9,0x10 \n"
" cmplwi %r9,0x02 \n" /* 601 cpu == 0x0001 */
" blt 2f \n" /* skip over non-601 BAT setup */
" \n"
" mtdbatu 3,%r0 \n" /* non-601 BAT */
" mtibatu 3,%r0 \n"
" isync \n"
" li %r8,0x1ffe \n" /* map the lowest 256MB */
" li %r9,0x22 \n" /* BAT_I */
" mtdbatl 3,%r9 \n"
" mtdbatu 3,%r8 \n"
" mtibatl 3,%r9 \n"
" mtibatu 3,%r8 \n"
" isync \n"
" b 3f \n"
" \n"
"2: mfmsr %r8 \n" /* 601 BAT */
" mtmsr %r0 \n"
" isync \n"
" \n"
" mtibatu 0,%r0 \n"
" mtibatu 1,%r0 \n"
" mtibatu 2,%r0 \n"
" mtibatu 3,%r0 \n"
" \n"
" li %r9,0x7f \n"
" mtibatl 0,%r9 \n"
" li %r9,0x1a \n"
" mtibatu 0,%r9 \n"
" \n"
" lis %r9,0x80 \n"
" addi %r9,%r9,0x7f \n"
" mtibatl 1,%r9 \n"
" lis %r9,0x80 \n"
" addi %r9,%r9,0x1a \n"
" mtibatu 1,%r9 \n"
" \n"
" lis %r9,0x100 \n"
" addi %r9,%r9,0x7f \n"
" mtibatl 2,%r9 \n"
" lis %r9,0x100 \n"
" addi %r9,%r9,0x1a \n"
" mtibatu 2,%r9 \n"
" \n"
" lis %r9,0x180 \n"
" addi %r9,%r9,0x7f \n"
" mtibatl 3,%r9 \n"
" lis %r9,0x180 \n"
" addi %r9,%r9,0x1a \n"
" mtibatu 3,%r9 \n"
" \n"
" isync \n"
" \n"
" mtmsr %r8 \n"
" isync \n"
" \n"
/*
* setup 32 KB of stack with 32 bytes overpad (see above)
*/
"3: lis %r1,(stack+32768)@ha\n"
" addi %r1,%r1,(stack+32768)@l\n"
/*
* terminate the frame link chain,
* clear by bytes to avoid ppc601 alignment exceptions
*/
" stb %r0,0(%r1) \n"
" stb %r0,1(%r1) \n"
" stb %r0,2(%r1) \n"
" stb %r0,3(%r1) \n"
" b startup \n"
);
static inline int
OF_finddevice(char *name)
{
static struct {
char *name;
int nargs;
int nreturns;
char *device;
int phandle;
} args = {
"finddevice",
1,
1,
};
args.device = name;
openfirmware(&args);
return args.phandle;
}
static inline int
OF_getprop(int handle, char *prop, void *buf, int buflen)
{
static struct {
char *name;
int nargs;
int nreturns;
int phandle;
char *prop;
void *buf;
int buflen;
int size;
} args = {
"getprop",
4,
1,
};
args.phandle = handle;
args.prop = prop;
args.buf = buf;
args.buflen = buflen;
openfirmware(&args);
return args.size;
}
static inline int
OF_open(char *dname)
{
static struct {
char *name;
int nargs;
int nreturns;
char *dname;
int handle;
} args = {
"open",
1,
1,
};
args.dname = dname;
openfirmware(&args);
return args.handle;
}
static inline int
OF_read(int handle, void *addr, int len)
{
static struct {
char *name;
int nargs;
int nreturns;
int ihandle;
void *addr;
int len;
int actual;
} args = {
"read",
3,
1,
};
args.ihandle = handle;
args.addr = addr;
args.len = len;
openfirmware(&args);
return args.actual;
}
static inline int
OF_seek(int handle, u_quad_t pos)
{
static struct {
char *name;
int nargs;
int nreturns;
int handle;
int poshi;
int poslo;
int status;
} args = {
"seek",
3,
1,
};
args.handle = handle;
args.poshi = (int)(pos >> 32);
args.poslo = (int)pos;
openfirmware(&args);
return args.status;
}
static inline int
OF_write(int handle, const void *addr, int len)
{
static struct {
char *name;
int nargs;
int nreturns;
int ihandle;
const void *addr;
int len;
int actual;
} args = {
"write",
3,
1,
};
args.ihandle = handle;
args.addr = addr;
args.len = len;
openfirmware(&args);
return args.actual;
}
int stdout;
static void
putstrn(const char *s, size_t n)
{
OF_write(stdout, s, n);
}
#define putstr(x) putstrn((x),sizeof(x)-1)
#define putc(x) do { char __x = (x) ; putstrn(&__x, 1); } while (0)
void
startup(int arg1, int arg2, void *openfirm)
{
int fd, blk, chosen, options, j;
uint32_t cpuvers;
size_t i;
char *addr;
char bootpath[128];
__asm volatile ("mfpvr %0" : "=r"(cpuvers));
cpuvers >>= 16;
openfirmware = openfirm;
chosen = OF_finddevice("/chosen");
if (OF_getprop(chosen, "bootpath", bootpath, sizeof(bootpath)) == 1) {
/*
* buggy firmware doesn't set bootpath...
*/
options = OF_finddevice("/options");
OF_getprop(options, "boot-device", bootpath, sizeof(bootpath));
}
if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout))
!= sizeof(stdout))
stdout = -1;
/*
* "scsi/sd@0:0" --> "scsi/sd@0"
*/
for (i = 0; i < sizeof(bootpath); i++) {
if (bootpath[i] == ':')
bootpath[i] = 0;
if (bootpath[i] == 0)
break;
}
putstr("\r\nOF_open bootpath=");
putstrn(bootpath, i);
fd = OF_open(bootpath);
addr = (char *)entry_point;
putstr("\r\nread stage 2 blocks: ");
for (j = 0; j < bbinfo.bbi_block_count; j++) {
if ((blk = bbinfo.bbi_block_table[j]) == 0)
break;
putc('0' + j % 10);
OF_seek(fd, (u_quad_t)blk * 512);
OF_read(fd, addr, bbinfo.bbi_block_size);
addr += bbinfo.bbi_block_size;
}
putstr(". done!\r\nstarting stage 2...\r\n");
if (cpuvers != MPC601) {
/*
* enable D/I cache
*/
__asm(
"mtdbatu 3,%0\n\t"
"mtdbatl 3,%1\n\t"
"mtibatu 3,%0\n\t"
"mtibatl 3,%1\n\t"
"isync"
:: "r"(BATU(0, BAT_BL_256M, BAT_Vs)),
"r"(BATL(0, 0, BAT_PP_RW)));
}
entry_point(0, 0, openfirm);
for (;;); /* just in case */
}