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/*
* Creation Date: <2004/08/28 18:38:22 greg>
* Time-stamp: <2004/08/28 18:38:22 greg>
*
* <main.c>
*
* Copyright (C) 2004 Greg Watson
*
* Based on MOL specific code which is
* Copyright (C) 2002, 2003, 2004 Samuel Rydh (samuel@ibrium.se)
*
* 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
*
*/
#include "openbios/config.h"
#include "openbios/bindings.h"
#include "openbios/elfload.h"
#include "openbios/nvram.h"
#include "libc/diskio.h"
#include "libc/vsprintf.h"
#include "pearpc/pearpc.h"
#include "ofmem.h"
static void
transfer_control_to_elf( ulong entry )
{
extern void call_elf( ulong entry );
printk("Starting ELF image at 0x%08lX\n", entry);
call_elf( 0x400000 );
//call_elf( entry );
fatal_error("call_elf returned unexpectedly\n");
}
static int
load_elf_rom( ulong *entry, int fd )
{
int i, lszz_offs, elf_offs;
char buf[128], *addr;
Elf_ehdr ehdr;
Elf_phdr *phdr;
size_t s;
printk("Loading '%s'\n", get_file_path(fd));
/* the ELF-image (usually) starts at offset 0x4000 */
if( (elf_offs=find_elf(fd)) < 0 ) {
printk("----> %s is not an ELF image\n", buf );
exit(1);
}
if( !(phdr=elf_readhdrs(fd, elf_offs, &ehdr)) )
fatal_error("elf_readhdrs failed\n");
*entry = ehdr.e_entry;
/* load segments. Compressed ROM-image assumed to be located immediately
* after the last segment */
lszz_offs = elf_offs;
for( i=0; i<ehdr.e_phnum; i++ ) {
/* p_memsz, p_flags */
s = MIN( phdr[i].p_filesz, phdr[i].p_memsz );
seek_io( fd, elf_offs + phdr[i].p_offset );
/* printk("filesz: %08lX memsz: %08lX p_offset: %08lX p_vaddr %08lX\n",
phdr[i].p_filesz, phdr[i].p_memsz, phdr[i].p_offset,
phdr[i].p_vaddr ); */
if( phdr[i].p_vaddr != phdr[i].p_paddr )
printk("WARNING: ELF segment virtual addr != physical addr\n");
lszz_offs = MAX( lszz_offs, elf_offs + phdr[i].p_offset + phdr[i].p_filesz );
if( !s )
continue;
if( ofmem_claim( phdr[i].p_vaddr, phdr[i].p_memsz, 0 ) == -1 )
fatal_error("Claim failed!\n");
addr = (char*)phdr[i].p_vaddr;
if( read_io(fd, addr, s) != s )
fatal_error("read failed\n");
#if 0
/* patch CODE segment */
if( *entry >= phdr[i].p_vaddr && *entry < phdr[i].p_vaddr + s ) {
patch_newworld_rom( (char*)phdr[i].p_vaddr, s );
newworld_timer_hack( (char*)phdr[i].p_vaddr, s );
}
#endif
flush_icache_range( addr, addr+s );
/*printk("ELF ROM-section loaded at %08lX (size %08lX)\n",
(ulong)phdr[i].p_vaddr, (ulong)phdr[i].p_memsz );*/
}
free( phdr );
return lszz_offs;
}
static void
encode_bootpath( const char *spec, const char *args )
{
phandle_t chosen_ph = find_dev("/chosen");
set_property( chosen_ph, "bootpath", spec, strlen(spec)+1 );
set_property( chosen_ph, "bootargs", args, strlen(args)+1 );
}
/************************************************************************/
/* pearpc booting */
/************************************************************************/
static void
pearpc_startup( void )
{
const char *paths[] = { "hd:0,\\zImage.chrp", NULL };
const char *args[] = { "root=/dev/hda2 console=ttyS0,115200", NULL };
ulong entry;
int i, fd;
for( i=0; paths[i]; i++ ) {
if( (fd=open_io(paths[i])) == -1 )
continue;
(void) load_elf_rom( &entry, fd );
close_io( fd );
encode_bootpath( paths[i], args[i] );
update_nvram();
transfer_control_to_elf( entry );
/* won't come here */
}
printk("*** Boot failure! No secondary bootloader specified ***\n");
}
/************************************************************************/
/* entry */
/************************************************************************/
void
boot( void )
{
fword("update-chosen");
pearpc_startup();
}
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