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/*
* Copyright (c) 1997 Paul Mackerras <paulus@cs.anu.edu.au>
* Initial Power Macintosh COFF version.
* Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
* Modifications for an ELF-based IBM evaluation board version.
*
* Module name: main.c
*
* Description:
* This module does most of the real work for the boot loader. It
* checks the variables holding the absolute start address and size
* of the Linux kernel "image" and initial RAM disk "initrd" sections
* and if they are present, moves them to their "proper" locations.
*
* For the Linux kernel, "proper" is physical address 0x00000000.
* For the RAM disk, "proper" is the image's size below the top
* of physical memory. The Linux kernel may be in either raw
* binary form or compressed with GNU zip (aka gzip).
*
* 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 <asm/board.h>
#include "../coffboot/nonstdio.h"
#include "../coffboot/zlib.h"
#include "irSect.h"
/* Preprocessor Defines */
/*
* Location of the IBM boot ROM function pointer address for retrieving
* the board information structure.
*/
#define BOARD_INFO_VECTOR 0xFFFE0B50
#define RAM_SIZE (4 * 1024 * 1024)
#define RAM_PBASE 0x00000000
#define RAM_PEND (RAM_PBASE + RAM_SIZE)
#define RAM_VBASE 0xC0000000
#define RAM_VEND (RAM_VBASE + RAM_SIZE)
#define RAM_START RAM_PBASE
#define RAM_END RAM_PEND
#define RAM_FREE (imageSect_start + imageSect_size + initrdSect_size)
#define PROG_START RAM_START
/* Function Macros */
#define ALIGN_UP(x, align) (((x) + ((align) - 1)) & ~((align) - 1))
/* Global Variables */
/* Needed by zalloc and zfree for allocating memory */
char *avail_ram; /* Indicates start of RAM available for heap */
char *end_avail; /* Indicates end of RAM available for heap */
bd_t board_info;
/*
* XXX - Until either the IBM boot ROM provides a way of passing arguments to
* the program it launches or until I/O is working in the boot loader,
* this is a good spot to pass in command line arguments to the kernel
* (e.g. console=tty0).
*/
static char *cmdline = "";
/* Function Prototypes */
void *zalloc(void *x, unsigned items, unsigned size);
void zfree(void *x, void *addr, unsigned nb);
void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp);
void printf () {}
void pause () {}
void exit () {}
void start(void)
{
void *options;
int ns, oh, i;
unsigned long sa, len;
void *dst;
unsigned char *im;
unsigned long initrd_start, initrd_size;
bd_t *(*get_board_info)(void) =
(bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
bd_t *bip = NULL;
if ((bip = get_board_info()) != NULL)
memcpy(&board_info, bip, sizeof(bd_t));
/* setup_bats(RAM_START); */
/* Init RAM disk (initrd) section */
if (initrdSect_start != 0 && (initrd_size = initrdSect_size) != 0) {
initrd_start = (RAM_END - initrd_size) & ~0xFFF;
printf("Initial RAM disk at 0x%08x (%u bytes)\n",
initrd_start, initrd_size);
memcpy((char *)initrd_start,
(char *)(initrdSect_start),
initrdSect_size);
end_avail = (char *)initrd_start;
} else {
initrd_start = initrd_size = 0;
end_avail = (char *)RAM_END;
}
/* Linux kernel image section */
im = (unsigned char *)(imageSect_start);
len = imageSect_size;
dst = (void *)PROG_START;
/* Check for the gzip archive magic numbers */
if (im[0] == 0x1f && im[1] == 0x8b) {
/* The gunzip routine needs everything nice and aligned */
void *cp = (void *)ALIGN_UP(RAM_FREE, 8);
avail_ram = (void *)(cp + ALIGN_UP(len, 8));
memcpy(cp, im, len);
/* I'm not sure what the 0x200000 parameter is for, but it works. */
gunzip(dst, 0x200000, cp, (int *)&len);
} else {
memmove(dst, im, len);
}
flush_cache(dst, len);
sa = (unsigned long)dst;
(*(void (*)())sa)(&board_info,
initrd_start,
initrd_start + initrd_size,
cmdline,
cmdline + strlen(cmdline));
pause();
}
void *zalloc(void *x, unsigned items, unsigned size)
{
void *p = avail_ram;
size *= items;
size = ALIGN_UP(size, 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();
}
printf("done 1\n");
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;
printf("doing inflate\n");
r = inflate(&s, Z_FINISH);
printf("done inflate\n");
if (r != Z_OK && r != Z_STREAM_END) {
printf("inflate returned %d\n", r);
exit();
}
*lenp = s.next_out - (unsigned char *) dst;
printf("doing end\n");
inflateEnd(&s);
}
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