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https://gitlab.com/qemu-project/openbios.git
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e11b806d1c
This patches copies all needed ppc files to qemu and modifies them. The generated OpenBIOS image must be loaded at adresse 0xfff00000 by Qemu. It is able to load Yaboot from disk and Yaboot is able to load Linux, but Linux hangs somewhere... of course it needs more work (but this cleans up my patch queue). Thank you to Blue Swirl and Aurelien Jarno for their help. Signed-off-by: Laurent Vivier <Laurent@lvivier.info> git-svn-id: svn://coreboot.org/openbios/openbios-devel@301 f158a5a8-5612-0410-a976-696ce0be7e32
147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
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* Creation Date: <2002/10/02 22:24:24 samuel>
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* Time-stamp: <2004/03/27 01:57:55 samuel>
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*
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* <main.c>
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*
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*
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*
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* Copyright (C) 2002, 2003, 2004 Samuel Rydh (samuel@ibrium.se)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation
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*
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*/
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#include "openbios/config.h"
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#include "openbios/bindings.h"
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#include "openbios/elfload.h"
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#include "openbios/nvram.h"
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#include "libc/diskio.h"
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#include "libc/vsprintf.h"
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#include "ofmem.h"
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//#define DEBUG_ELF
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#ifdef DEBUG_ELF
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#define ELF_DPRINTF(fmt, args...) \
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do { printk("ELF - %s: " fmt, __func__ , ##args); } while (0)
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#else
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#define ELF_DPRINTF(fmt, args...) do { } while (0)
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#endif
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static void
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transfer_control_to_elf( ulong entry )
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{
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extern void call_elf( ulong entry );
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ELF_DPRINTF("Starting ELF boot loader\n");
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call_elf( entry );
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fatal_error("call_elf returned unexpectedly\n");
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}
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static int
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load_elf_rom( ulong *elf_entry, int fd )
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{
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int i, lszz_offs, elf_offs;
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char buf[128], *addr;
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Elf_ehdr ehdr;
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Elf_phdr *phdr;
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size_t s;
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ELF_DPRINTF("Loading '%s' from '%s'\n", get_file_path(fd),
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get_volume_name(fd) );
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/* the ELF-image (usually) starts at offset 0x4000 */
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if( (elf_offs=find_elf(fd)) < 0 ) {
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ELF_DPRINTF("----> %s is not an ELF image\n", buf );
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exit(1);
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}
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if( !(phdr=elf_readhdrs(fd, elf_offs, &ehdr)) )
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fatal_error("elf_readhdrs failed\n");
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*elf_entry = ehdr.e_entry;
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/* load segments. Compressed ROM-image assumed to be located immediately
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* after the last segment */
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lszz_offs = elf_offs;
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for( i=0; i<ehdr.e_phnum; i++ ) {
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/* p_memsz, p_flags */
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s = MIN( phdr[i].p_filesz, phdr[i].p_memsz );
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seek_io( fd, elf_offs + phdr[i].p_offset );
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ELF_DPRINTF("filesz: %08lX memsz: %08lX p_offset: %08lX p_vaddr %08lX\n",
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phdr[i].p_filesz, phdr[i].p_memsz, phdr[i].p_offset,
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phdr[i].p_vaddr );
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if( phdr[i].p_vaddr != phdr[i].p_paddr )
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ELF_DPRINTF("WARNING: ELF segment virtual addr != physical addr\n");
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lszz_offs = MAX( lszz_offs, elf_offs + phdr[i].p_offset + phdr[i].p_filesz );
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if( !s )
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continue;
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if( ofmem_claim( phdr[i].p_vaddr, phdr[i].p_memsz, 0 ) == -1 )
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fatal_error("Claim failed!\n");
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addr = (char*)phdr[i].p_vaddr;
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if( read_io(fd, addr, s) != s )
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fatal_error("read failed\n");
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flush_icache_range( addr, addr+s );
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ELF_DPRINTF("ELF ROM-section loaded at %08lX (size %08lX)\n",
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(ulong)phdr[i].p_vaddr, (ulong)phdr[i].p_memsz );
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}
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free( phdr );
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return lszz_offs;
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}
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static void
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encode_bootpath( const char *spec, const char *args )
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{
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phandle_t chosen_ph = find_dev("/chosen");
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set_property( chosen_ph, "bootpath", spec, strlen(spec)+1 );
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set_property( chosen_ph, "bootargs", args, strlen(args)+1 );
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}
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/************************************************************************/
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/* qemu booting */
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/************************************************************************/
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static void
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yaboot_startup( void )
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{
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const char *paths[] = { "hd:2,\\ofclient", "hd:2,\\yaboot", NULL };
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const char *args[] = { "", "conf=hd:2,\\yaboot.conf", NULL };
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ulong elf_entry;
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int i, fd;
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for( i=0; paths[i]; i++ ) {
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if( (fd=open_io(paths[i])) == -1 )
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continue;
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(void) load_elf_rom( &elf_entry, fd );
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close_io( fd );
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encode_bootpath( paths[i], args[i] );
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update_nvram();
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ELF_DPRINTF("Transfering control to %s %s\n",
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paths[i], args[i]);
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transfer_control_to_elf( elf_entry );
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/* won't come here */
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}
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printk("*** Boot failure! No secondary bootloader specified ***\n");
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}
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/************************************************************************/
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/* entry */
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/************************************************************************/
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void
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boot( void )
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{
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fword("update-chosen");
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yaboot_startup();
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}
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