grub/loader/powerpc/ieee1275/linux.c
hollisb 09f9923fbb 2005-07-12 Hollis Blanchard <hollis@penguinppc.org>
* disk/powerpc/ieee1275/ofdisk.c (grub_ofdisk_open): dprintf the
	device path and resulting ihandle.
	(grub_ofdisk_close): dprintf the ihandle being closed.
	(grub_ofdisk_read): dprintf function parameters.
	* kern/mm.c (grub_mm_init_region): Likewise.
	* loader/powerpc/ieee1275/linux.c: Remove extra whitespace.
	(grub_linux_boot): dprintf the Linux entry point, initrd address and
	size, and boot arguments.
	(grub_rescue_cmd_linux): dprintf each ELF segment's address and size
	before loading into memory.
	(grub_rescue_cmd_initrd): dprintf the initrd's address and size
	before loading into memory.
2005-07-12 22:36:43 +00:00

318 lines
7.3 KiB
C
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/* linux.c - boot Linux */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <grub/machine/loader.h>
#include <grub/machine/ieee1275.h>
#include <grub/elf.h>
#include <grub/loader.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/rescue.h>
#include <grub/misc.h>
static grub_dl_t my_mod;
static int loaded;
static int vmlinux;
static grub_addr_t initrd_addr;
static grub_size_t initrd_size;
static grub_addr_t linux_addr;
static grub_size_t linux_size;
static char *linux_args;
typedef void (*kernel_entry_t) (void *, unsigned long, intptr_t (void *),
unsigned long, unsigned long);
static grub_err_t
grub_linux_boot (void)
{
kernel_entry_t linuxmain;
grub_size_t actual;
/* Set the command line arguments. */
grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args,
grub_strlen (linux_args) + 1, &actual);
grub_dprintf ("loader", "Entry point: 0x%x\n", linux_addr);
grub_dprintf ("loader", "Initrd at: 0x%x, size 0x%x\n", initrd_addr,
initrd_size);
grub_dprintf ("loader", "Boot arguments: %s\n", linux_args);
grub_dprintf ("loader", "Jumping to Linux...\n");
/* Boot the kernel. */
linuxmain = (kernel_entry_t) linux_addr;
linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_linux_release_mem (void)
{
grub_free (linux_args);
linux_args = 0;
if (linux_addr && grub_ieee1275_release (linux_addr, linux_size))
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not release memory");
if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size))
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not release memory");
linux_addr = 0;
initrd_addr = 0;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_linux_unload (void)
{
grub_err_t err;
err = grub_linux_release_mem ();
grub_dl_unref (my_mod);
loaded = 0;
return err;
}
void
grub_rescue_cmd_linux (int argc, char *argv[])
{
grub_file_t file = 0;
Elf32_Ehdr ehdr;
Elf32_Phdr *phdrs = 0;
int i;
int offset = 0;
grub_addr_t entry;
int found_addr = 0;
int size;
grub_dl_ref (my_mod);
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
goto fail;
}
file = grub_file_open (argv[0]);
if (! file)
goto fail;
if (grub_file_read (file, (char *) &ehdr, sizeof (ehdr)) != sizeof (ehdr))
{
grub_error (GRUB_ERR_READ_ERROR, "cannot read the linux elf header");
goto fail;
}
if (grub_dl_check_header (&ehdr, sizeof(ehdr)))
{
grub_error (GRUB_ERR_UNKNOWN_OS, "No valid ELF header found");
goto fail;
}
if (ehdr.e_type != ET_EXEC)
{
grub_error (GRUB_ERR_UNKNOWN_OS,
"This ELF file is not of the right type\n");
goto fail;
}
/* Read the sections. */
entry = ehdr.e_entry;
if (entry == 0xc0000000)
{
entry = 0x01400000;
vmlinux = 1;
}
else
vmlinux = 0;
phdrs = (Elf32_Phdr *) grub_malloc (ehdr.e_phnum * ehdr.e_phentsize);
grub_file_read (file, (void *) phdrs, ehdr.e_phnum * ehdr.e_phentsize);
/* Release the previously used memory. */
grub_loader_unset ();
/* Determine the amount of memory that is required. */
linux_size = 0;
for (i = 0; i < ehdr.e_phnum; i++)
{
Elf32_Phdr *phdr = phdrs + i;
/* XXX: Is this calculation correct? */
linux_size += phdr->p_memsz + phdr->p_filesz;
}
/* Reserve memory for the kernel. */
linux_size += 0x100000;
/* For some vmlinux kernels the address set above won't work. Just
try some other addresses just like yaboot does. */
for (linux_addr = entry; linux_addr < entry + 200 * 0x100000; linux_addr += 0x100000)
{
found_addr = grub_claimmap (linux_addr, linux_size);
if (found_addr != -1)
break;
}
if (found_addr == -1)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not claim memory");
goto fail;
}
entry = linux_addr;
/* Load every loadable segment in memory. */
for (i = 0; i < ehdr.e_phnum; i++)
{
Elf32_Phdr *phdr = phdrs + i;
if (phdr->p_type == PT_LOAD)
{
void *segment_addr = ((char *) entry) + offset;
if (grub_file_seek (file, phdr->p_offset) == -1)
{
grub_error (GRUB_ERR_BAD_OS, "Invalid offset in program header");
goto fail;
}
grub_dprintf ("loader", "Loading segment %d at %p, size 0x%x\n", i,
segment_addr, phdr->p_filesz);
if (grub_file_read (file, segment_addr, phdr->p_filesz)
!= (grub_ssize_t) phdr->p_filesz)
goto fail;
if (phdr->p_filesz < phdr->p_memsz)
grub_memset ((char *) (((char *) entry) + offset) + phdr->p_filesz, 0,
phdr->p_memsz - phdr->p_filesz);
offset += phdr->p_filesz;
}
}
size = 0;
for (i = 0; i < argc; i++)
size += grub_strlen (argv[i]);
linux_args = grub_malloc (size + argc + 1);
if (!linux_args)
goto fail;
for (i = 1; i < argc; i++)
{
grub_strcat (linux_args, argv[i]);
grub_strcat (linux_args, " ");
}
fail:
if (file)
grub_file_close (file);
grub_free (phdrs);
if (grub_errno != GRUB_ERR_NONE)
{
grub_linux_release_mem ();
grub_dl_unref (my_mod);
loaded = 0;
}
else
{
grub_loader_set (grub_linux_boot, grub_linux_unload);
initrd_addr = 0;
loaded = 1;
}
return;
}
void
grub_rescue_cmd_initrd (int argc, char *argv[])
{
grub_file_t file = 0;
grub_ssize_t size;
grub_addr_t addr;
if (argc == 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified");
goto fail;
}
if (!loaded)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "You need to load the kernel first.");
goto fail;
}
file = grub_file_open (argv[0]);
if (! file)
goto fail;
addr = linux_addr + linux_size;
size = grub_file_size (file);
if (grub_claimmap (addr, size) == -1)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not claim memory");
goto fail;
}
grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size);
if (grub_file_read (file, (void *) addr, size) != size)
{
grub_ieee1275_release (addr, size);
grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
goto fail;
}
initrd_addr = addr;
initrd_size = size;
fail:
if (file)
grub_file_close (file);
}
GRUB_MOD_INIT
{
grub_rescue_register_command ("linux", grub_rescue_cmd_linux,
"load a linux kernel");
grub_rescue_register_command ("initrd", grub_rescue_cmd_initrd,
"load an initrd");
my_mod = mod;
}
GRUB_MOD_FINI
{
grub_rescue_unregister_command ("linux");
grub_rescue_unregister_command ("initrd");
}