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/*
* kexec-elf-ppc.c - kexec Elf loader for the PowerPC
* Copyright (C) 2004 Albert Herranz
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <elf.h>
#include <boot/elf_boot.h>
#include <ip_checksum.h>
#include "../../kexec.h"
#include "../../kexec-elf.h"
#include "kexec-ppc.h"
#include <arch/options.h>
#include "config.h"
static const int probe_debug = 0;
#define MAX_COMMAND_LINE 256
#define UPSZ(X) ((sizeof(X) + 3) & ~3)
static struct boot_notes {
Elf_Bhdr hdr;
Elf_Nhdr bl_hdr;
unsigned char bl_desc[UPSZ(BOOTLOADER)];
Elf_Nhdr blv_hdr;
unsigned char blv_desc[UPSZ(BOOTLOADER_VERSION)];
Elf_Nhdr cmd_hdr;
unsigned char command_line[0];
} elf_boot_notes = {
.hdr = {
.b_signature = 0x0E1FB007,
.b_size = sizeof(elf_boot_notes),
.b_checksum = 0,
.b_records = 3,
},
.bl_hdr = {
.n_namesz = 0,
.n_descsz = sizeof(BOOTLOADER),
.n_type = EBN_BOOTLOADER_NAME,
},
.bl_desc = BOOTLOADER,
.blv_hdr = {
.n_namesz = 0,
.n_descsz = sizeof(BOOTLOADER_VERSION),
.n_type = EBN_BOOTLOADER_VERSION,
},
.blv_desc = BOOTLOADER_VERSION,
.cmd_hdr = {
.n_namesz = 0,
.n_descsz = 0,
.n_type = EBN_COMMAND_LINE,
},
};
int elf_ppc_probe(const char *buf, off_t len)
{
struct mem_ehdr ehdr;
int result;
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0) {
goto out;
}
/* Verify the architecuture specific bits */
if (ehdr.e_machine != EM_PPC) {
/* for a different architecture */
if (probe_debug) {
fprintf(stderr, "Not for this architecture.\n");
}
result = -1;
goto out;
}
result = 0;
out:
free_elf_info(&ehdr);
return result;
}
void elf_ppc_usage(void)
{
printf
(
" --command-line=STRING Set the kernel command line to STRING.\n"
" --append=STRING Set the kernel command line to STRING.\n"
" --gamecube=1|0 Enable/disable support for ELFs with changed\n"
" addresses suitable for the GameCube.\n");
}
static void gamecube_hack_addresses(struct mem_ehdr *ehdr)
{
struct mem_phdr *phdr, *phdr_end;
phdr_end = ehdr->e_phdr + ehdr->e_phnum;
for(phdr = ehdr->e_phdr; phdr != phdr_end; phdr++) {
/*
* GameCube ELF kernel is linked with memory mapped
* this way (to easily transform it into a DOL
* suitable for being loaded with psoload):
*
* 80000000 - 817fffff 24MB RAM, cached
* c0000000 - c17fffff 24MB RAM, not cached
*
* kexec, instead, needs physical memory layout, so
* we clear the upper bits of the address.
* (2 bits should be enough, indeed)
*/
phdr->p_paddr &= ~0xf0000000; /* clear bits 0-3, ibm syntax */
}
}
int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
char *arg_buf;
size_t arg_bytes;
unsigned long arg_base;
struct boot_notes *notes;
size_t note_bytes;
const char *command_line;
int command_line_len;
unsigned char *setup_start;
uint32_t setup_size;
int result;
#ifdef WITH_GAMECUBE
int target_is_gamecube = 1;
#else
int target_is_gamecube = 0;
#endif
int opt;
#define OPT_APPEND (OPT_ARCH_MAX+0)
#define OPT_GAMECUBE (OPT_ARCH_MAX+1)
static const struct option options[] = {
KEXEC_ARCH_OPTIONS
{"command-line", 1, 0, OPT_APPEND},
{"append", 1, 0, OPT_APPEND},
{"gamecube", 1, 0, OPT_GAMECUBE},
{0, 0, 0, 0},
};
static const char short_options[] = KEXEC_ARCH_OPT_STR "d";
command_line = 0;
while ((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
switch (opt) {
default:
/* Ignore core options */
if (opt < OPT_ARCH_MAX) {
break;
}
case '?':
usage();
return -1;
case OPT_APPEND:
command_line = optarg;
break;
case OPT_GAMECUBE:
target_is_gamecube = atoi(optarg);
break;
}
}
command_line_len = 0;
if (command_line) {
command_line_len = strlen(command_line) + 1;
}
/* Parse the Elf file */
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0) {
free_elf_info(&ehdr);
return result;
}
if (target_is_gamecube) {
gamecube_hack_addresses(&ehdr);
}
/* Load the Elf data */
result = elf_exec_load(&ehdr, info);
if (result < 0) {
free_elf_info(&ehdr);
return result;
}
if (target_is_gamecube) {
setup_start = setup_dol_start;
setup_size = setup_dol_size;
setup_dol_regs.spr8 = ehdr.e_entry; /* Link Register */
} else {
setup_start = setup_simple_start;
setup_size = setup_simple_size;
setup_simple_regs.spr8 = ehdr.e_entry; /* Link Register */
}
note_bytes = sizeof(elf_boot_notes) + ((command_line_len + 3) & ~3);
arg_bytes = note_bytes + ((setup_size + 3) & ~3);
arg_buf = xmalloc(arg_bytes);
arg_base = add_buffer(info,
arg_buf, arg_bytes, arg_bytes, 4, 0, elf_max_addr(&ehdr), 1);
notes = (struct boot_notes *)(arg_buf + ((setup_size + 3) & ~3));
memcpy(arg_buf, setup_start, setup_size);
memcpy(notes, &elf_boot_notes, sizeof(elf_boot_notes));
memcpy(notes->command_line, command_line, command_line_len);
notes->hdr.b_size = note_bytes;
notes->cmd_hdr.n_descsz = command_line_len;
notes->hdr.b_checksum = compute_ip_checksum(notes, note_bytes);
info->entry = (void *)arg_base;
return 0;
}
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