blob: 2af3f2f4916a2281a09aebb3013c2557d2f896b3 [file] [log] [blame]
/*
* Copyright (C) Paul Mackerras 1997.
*
* Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
*
* 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.
*/
#define __KERNEL__
#include "ppc32-types.h"
#include "zlib.h"
#include <linux/elf.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/bootinfo.h>
void memmove(void *dst, void *im, int len);
void *memcpy(void *dest, const void *src, size_t n);
size_t strlen(const char *s);
extern void *finddevice(const char *);
extern int getprop(void *, const char *, void *, int);
extern void printk(char *fmt, ...);
extern void printf(const char *fmt, ...);
extern int sprintf(char *buf, const char *fmt, ...);
void gunzip(void *, int, unsigned char *, int *);
void *claim(unsigned int, unsigned int, unsigned int);
void flush_cache(void *, unsigned long);
void pause(void);
extern void exit(void);
static struct bi_record *make_bi_recs(unsigned long);
#define RAM_START 0x00000000
#define RAM_END (64<<20)
/* Value picked to match that used by yaboot */
#define PROG_START 0x01400000
char *avail_ram;
char *begin_avail, *end_avail;
char *avail_high;
unsigned int heap_use;
unsigned int heap_max;
extern char _end[];
extern char _vmlinux_start[];
extern char _vmlinux_end[];
extern char _sysmap_start[];
extern char _sysmap_end[];
extern char _initrd_start[];
extern char _initrd_end[];
extern void *_vmlinux_filesize;
extern void *_vmlinux_memsize;
struct addr_range {
unsigned long addr;
unsigned long size;
unsigned long memsize;
};
struct addr_range vmlinux = {0, 0, 0};
struct addr_range vmlinuz = {0, 0, 0};
struct addr_range sysmap = {0, 0, 0};
struct addr_range initrd = {0, 0, 0};
static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
typedef void (*kernel_entry_t)( unsigned long,
unsigned long,
void *,
struct bi_record *);
int (*prom)(void *);
void *chosen_handle;
void *stdin;
void *stdout;
void *stderr;
void
start(unsigned long a1, unsigned long a2, void *promptr)
{
unsigned long i, claim_addr, claim_size;
unsigned long vmlinux_filesize;
extern char _start;
struct bi_record *bi_recs;
kernel_entry_t kernel_entry;
Elf64_Ehdr *elf64;
Elf64_Phdr *elf64ph;
prom = (int (*)(void *)) promptr;
chosen_handle = finddevice("/chosen");
if (chosen_handle == (void *) -1)
exit();
if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
exit();
stderr = stdout;
if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
exit();
printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)&_start);
initrd.size = (unsigned long)(_initrd_end - _initrd_start);
initrd.memsize = initrd.size;
if ( initrd.size > 0 ) {
initrd.addr = (RAM_END - initrd.size) & ~0xFFF;
a1 = a2 = 0;
claim(initrd.addr, RAM_END - initrd.addr, 0);
printf("initial ramdisk moving 0x%lx <- 0x%lx (%lx bytes)\n\r",
initrd.addr, (unsigned long)_initrd_start, initrd.size);
memcpy((void *)initrd.addr, (void *)_initrd_start, initrd.size);
}
vmlinuz.addr = (unsigned long)_vmlinux_start;
vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
vmlinux.addr = (unsigned long)(void *)-1;
vmlinux_filesize = (unsigned long)&_vmlinux_filesize;
vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
vmlinux.memsize = (unsigned long)&_vmlinux_memsize;
claim_size = vmlinux.memsize /* PPPBBB: + fudge for bi_recs */;
for(claim_addr = PROG_START;
claim_addr <= PROG_START * 8;
claim_addr += 0x100000) {
printf(" trying: 0x%08lx\n\r", claim_addr);
vmlinux.addr = (unsigned long)claim(claim_addr, claim_size, 0);
if ((void *)vmlinux.addr != (void *)-1) break;
}
if ((void *)vmlinux.addr == (void *)-1) {
printf("claim error, can't allocate kernel memory\n\r");
exit();
}
/* PPPBBB: should kernel always be gziped? */
if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
avail_ram = scratch;
begin_avail = avail_high = avail_ram;
end_avail = scratch + sizeof(scratch);
printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
gunzip((void *)vmlinux.addr, vmlinux.size,
(unsigned char *)vmlinuz.addr, (int *)&vmlinuz.size);
printf("done %lu bytes\n\r", vmlinuz.size);
printf("%u bytes of heap consumed, max in use %u\n\r",
(unsigned)(avail_high - begin_avail), heap_max);
} else {
memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
}
/* Skip over the ELF header */
elf64 = (Elf64_Ehdr *)vmlinux.addr;
if ( elf64->e_ident[EI_MAG0] != ELFMAG0 ||
elf64->e_ident[EI_MAG1] != ELFMAG1 ||
elf64->e_ident[EI_MAG2] != ELFMAG2 ||
elf64->e_ident[EI_MAG3] != ELFMAG3 ||
elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
elf64->e_type != ET_EXEC ||
elf64->e_machine != EM_PPC64 )
{
printf("Error: not a valid PPC64 ELF file!\n\r");
exit();
}
elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
(unsigned long)elf64->e_phoff);
for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
break;
}
printf("... skipping 0x%lx bytes of ELF header\n\r",
(unsigned long)elf64ph->p_offset);
vmlinux.addr += (unsigned long)elf64ph->p_offset;
vmlinux.size -= (unsigned long)elf64ph->p_offset;
flush_cache((void *)vmlinux.addr, vmlinux.memsize);
bi_recs = make_bi_recs(vmlinux.addr + vmlinux.memsize);
kernel_entry = (kernel_entry_t)vmlinux.addr;
printf( "kernel:\n\r"
" entry addr = 0x%lx\n\r"
" a1 = 0x%lx,\n\r"
" a2 = 0x%lx,\n\r"
" prom = 0x%lx,\n\r"
" bi_recs = 0x%lx,\n\r",
(unsigned long)kernel_entry, a1, a2,
(unsigned long)prom, (unsigned long)bi_recs);
kernel_entry( a1, a2, prom, bi_recs );
printf("Error: Linux kernel returned to zImage bootloader!\n\r");
exit();
}
static struct bi_record *
make_bi_recs(unsigned long addr)
{
struct bi_record *bi_recs;
struct bi_record *rec;
bi_recs = rec = bi_rec_init(addr);
rec = bi_rec_alloc(rec, 2);
rec->tag = BI_FIRST;
/* rec->data[0] = ...; # Written below before return */
/* rec->data[1] = ...; # Written below before return */
rec = bi_rec_alloc_bytes(rec, strlen("chrpboot")+1);
rec->tag = BI_BOOTLOADER_ID;
sprintf( (char *)rec->data, "chrpboot");
rec = bi_rec_alloc(rec, 2);
rec->tag = BI_MACHTYPE;
rec->data[0] = PLATFORM_PSERIES;
rec->data[1] = 1;
if ( initrd.size > 0 ) {
rec = bi_rec_alloc(rec, 2);
rec->tag = BI_INITRD;
rec->data[0] = initrd.addr;
rec->data[1] = initrd.size;
}
if ( sysmap.size > 0 ) {
rec = bi_rec_alloc(rec, 2);
rec->tag = BI_SYSMAP;
rec->data[0] = (unsigned long)sysmap.addr;
rec->data[1] = (unsigned long)sysmap.size;
}
rec = bi_rec_alloc(rec, 1);
rec->tag = BI_LAST;
rec->data[0] = (bi_rec_field)bi_recs;
/* Save the _end_ address of the bi_rec's in the first bi_rec
* data field for easy access by the kernel.
*/
bi_recs->data[0] = (bi_rec_field)rec;
bi_recs->data[1] = (bi_rec_field)rec + rec->size - (bi_rec_field)bi_recs;
return bi_recs;
}
struct memchunk {
unsigned int size;
unsigned int pad;
struct memchunk *next;
};
static struct memchunk *freechunks;
void *zalloc(void *x, unsigned items, unsigned size)
{
void *p;
struct memchunk **mpp, *mp;
size *= items;
size = _ALIGN(size, sizeof(struct memchunk));
heap_use += size;
if (heap_use > heap_max)
heap_max = heap_use;
for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
if (mp->size == size) {
*mpp = mp->next;
return mp;
}
}
p = avail_ram;
avail_ram += size;
if (avail_ram > avail_high)
avail_high = avail_ram;
if (avail_ram > end_avail) {
printf("oops... out of memory\n\r");
pause();
}
return p;
}
void zfree(void *x, void *addr, unsigned nb)
{
struct memchunk *mp = addr;
nb = _ALIGN(nb, sizeof(struct memchunk));
heap_use -= nb;
if (avail_ram == addr + nb) {
avail_ram = addr;
return;
}
mp->size = nb;
mp->next = freechunks;
freechunks = mp;
}
#define HEAD_CRC 2
#define EXTRA_FIELD 4
#define ORIG_NAME 8
#define COMMENT 0x10
#define RESERVED 0xe0
#define DEFLATED 8
void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
{
z_stream s;
int r, i, flags;
/* skip header */
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
printf("bad gzipped data\n\r");
exit();
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= *lenp) {
printf("gunzip: ran out of data in header\n\r");
exit();
}
s.zalloc = zalloc;
s.zfree = zfree;
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf("inflateInit2 returned %d\n\r", r);
exit();
}
s.next_in = src + i;
s.avail_in = *lenp - i;
s.next_out = dst;
s.avail_out = dstlen;
r = inflate(&s, Z_FINISH);
if (r != Z_OK && r != Z_STREAM_END) {
printf("inflate returned %d msg: %s\n\r", r, s.msg);
exit();
}
*lenp = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
}