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/*
* Copyright (C) Paul Mackerras 1997.
*
* 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 "nonstdio.h"
#include "rs6000.h"
#include "zlib.h"
extern void *finddevice(const char *);
extern int getprop(void *, const char *, void *, int);
void gunzip(void *, int, unsigned char *, int *);
#define get_16be(x) (*(unsigned short *)(x))
#define get_32be(x) (*(unsigned *)(x))
#define RAM_START 0xc0000000
#define RAM_END 0xc0800000 /* only 8M mapped with BATs */
#define RAM_FREE 0xc0540000 /* after image of coffboot */
char *avail_ram;
char *end_avail;
coffboot(int a1, int a2, void *prom)
{
void *options;
unsigned loadbase;
struct external_filehdr *eh;
struct external_scnhdr *sp;
struct external_scnhdr *isect, *rsect;
int ns, oh, i;
unsigned sa, len;
void *dst;
unsigned char *im;
unsigned initrd_start, initrd_size;
printf("coffboot starting\n");
options = finddevice("/options");
if (options == (void *) -1)
exit();
if (getprop(options, "load-base", &loadbase, sizeof(loadbase))
!= sizeof(loadbase)) {
printf("error getting load-base\n");
exit();
}
setup_bats();
eh = (struct external_filehdr *) loadbase;
ns = get_16be(eh->f_nscns);
oh = get_16be(eh->f_opthdr);
sp = (struct external_scnhdr *) (loadbase + sizeof(struct external_filehdr) + oh);
isect = rsect = NULL;
for (i = 0; i < ns; ++i, ++sp) {
if (strcmp(sp->s_name, "image") == 0)
isect = sp;
else if (strcmp(sp->s_name, "initrd") == 0)
rsect = sp;
}
if (isect == NULL) {
printf("image section not found\n");
exit();
}
if (rsect != NULL && (initrd_size = get_32be(rsect->s_size)) != 0) {
initrd_start = (RAM_END - initrd_size) & ~0xFFF;
a1 = initrd_start;
a2 = initrd_size;
printf("initial ramdisk at %x (%u bytes)\n",
initrd_start, initrd_size);
memcpy((char *) initrd_start,
(char *) (loadbase + get_32be(rsect->s_scnptr)),
initrd_size);
end_avail = (char *) initrd_start;
} else {
end_avail = (char *) RAM_END;
}
im = (unsigned char *)(loadbase + get_32be(isect->s_scnptr));
len = get_32be(isect->s_size);
dst = (void *) RAM_START;
if (im[0] == 0x1f && im[1] == 0x8b) {
void *cp = (void *) RAM_FREE;
avail_ram = (void *) (RAM_FREE + ((len + 7) & -8));
memcpy(cp, im, len);
printf("gunzipping... ");
gunzip(dst, 0x400000, cp, &len);
printf("done\n");
} else {
memmove(dst, im, len);
}
flush_cache(dst, len);
sa = *(unsigned *)dst + RAM_START;
printf("start address = 0x%x\n", sa);
#if 0
pause();
#endif
(*(void (*)())sa)(a1, a2, prom);
printf("returned?\n");
pause();
}
void *zalloc(void *x, unsigned items, unsigned size)
{
void *p = avail_ram;
size *= items;
size = (size + 7) & -8;
avail_ram += size;
if (avail_ram > end_avail) {
printf("oops... out of memory\n");
pause();
}
return p;
}
void zfree(void *x, void *addr, unsigned nb)
{
}
#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");
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");
exit();
}
s.zalloc = zalloc;
s.zfree = zfree;
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf("inflateInit2 returned %d\n", 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\n", r);
exit();
}
*lenp = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
}
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