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grub/grub-core/loader/arm/linux.c

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/* linux.c - boot Linux */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/fdt.h>
#include <grub/file.h>
#include <grub/loader.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/command.h>
#include <grub/cache.h>
#include <grub/cpu/linux.h>
#include <grub/lib/cmdline.h>
#include <grub/linux.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
static grub_addr_t initrd_start;
static grub_addr_t initrd_end;
static grub_addr_t linux_addr;
static grub_size_t linux_size;
static char *linux_args;
static grub_uint32_t machine_type;
static void *fdt_addr;
#define LINUX_ZIMAGE_OFFSET 0x24
#define LINUX_ZIMAGE_MAGIC 0x016f2818
#define ARM_FDT_MACHINE_TYPE 0xFFFFFFFF
#define LINUX_PHYS_OFFSET (0x00008000)
#define LINUX_INITRD_PHYS_OFFSET (LINUX_PHYS_OFFSET + 0x02000000)
#define LINUX_FDT_PHYS_OFFSET (LINUX_INITRD_PHYS_OFFSET - 0x10000)
/*
* linux_prepare_fdt():
* Prepares a loaded FDT for being passed to Linux.
* Merges in command line parameters and sets up initrd addresses.
*/
static grub_err_t
linux_prepare_fdt (void)
{
int node;
int retval;
int tmp_size;
void *tmp_fdt;
tmp_size = grub_fdt_get_totalsize (fdt_addr) + 0x100 + grub_strlen (linux_args);
tmp_fdt = grub_malloc (tmp_size);
if (!tmp_fdt)
return grub_errno;
grub_memcpy (tmp_fdt, fdt_addr, grub_fdt_get_totalsize (fdt_addr));
grub_fdt_set_totalsize (tmp_fdt, tmp_size);
/* Find or create '/chosen' node */
node = grub_fdt_find_subnode (tmp_fdt, 0, "chosen");
if (node < 0)
{
grub_dprintf ("linux", "No 'chosen' node in FDT - creating.\n");
node = grub_fdt_add_subnode (tmp_fdt, 0, "chosen");
if (node < 0)
goto failure;
}
grub_dprintf ("linux", "linux_args: '%s'\n", linux_args);
/* Generate and set command line */
retval = grub_fdt_set_prop (tmp_fdt, node, "bootargs", linux_args,
grub_strlen (linux_args) + 1);
if (retval)
goto failure;
if (initrd_start && initrd_end)
{
/*
* We're using physical addresses, so even if we have LPAE, we're
* restricted to a 32-bit address space.
*/
grub_dprintf ("loader", "Initrd @ 0x%08x-0x%08x\n",
initrd_start, initrd_end);
retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-start",
initrd_start);
if (retval)
goto failure;
retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-end",
initrd_end);
if (retval)
goto failure;
}
/* Copy updated FDT to its launch location */
grub_memcpy (fdt_addr, tmp_fdt, tmp_size);
grub_free (tmp_fdt);
grub_dprintf ("loader", "FDT updated for Linux boot\n");
return GRUB_ERR_NONE;
failure:
grub_free (tmp_fdt);
return grub_error (GRUB_ERR_BAD_ARGUMENT, "unable to prepare FDT");
}
static grub_err_t
linux_boot (void)
{
kernel_entry_t linuxmain;
grub_err_t err;
if (!fdt_addr && machine_type == ARM_FDT_MACHINE_TYPE)
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
N_("device tree must be supplied (see `devicetree' command)"));
grub_arch_sync_caches ((void *) linux_addr, linux_size);
grub_dprintf ("loader", "Kernel at: 0x%x\n", linux_addr);
err = linux_prepare_fdt ();
if (err)
return err;
grub_dprintf ("loader", "FDT @ 0x%p\n", fdt_addr);
grub_dprintf ("loader", "Jumping to Linux...\n");
/* Boot the kernel.
* Arguments to kernel:
* r0 - 0
* r1 - machine type
* r2 - address of DTB
*/
linuxmain = (kernel_entry_t) linux_addr;
#ifdef GRUB_MACHINE_EFI
err = grub_efi_prepare_platform();
if (err != GRUB_ERR_NONE)
return err;
#endif
linuxmain (0, machine_type, fdt_addr);
return err;
}
/*
* Only support zImage, so no relocations necessary
*/
static grub_err_t
linux_load (const char *filename, grub_file_t file)
{
int size;
size = grub_file_size (file);
if (size == 0)
return grub_error (GRUB_ERR_BAD_OS, "empty kernel");
#ifdef GRUB_MACHINE_EFI
linux_addr = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_PHYS_OFFSET, size);
if (!linux_addr)
return grub_errno;
#else
linux_addr = LINUX_ADDRESS;
#endif
grub_dprintf ("loader", "Loading Linux to 0x%08x\n",
(grub_addr_t) linux_addr);
if (grub_file_read (file, (void *) linux_addr, size) != size)
{
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
filename);
return grub_errno;
}
if (*(grub_uint32_t *) (linux_addr + LINUX_ZIMAGE_OFFSET)
!= LINUX_ZIMAGE_MAGIC)
{
return grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid zImage"));
}
linux_size = size;
return GRUB_ERR_NONE;
}
static grub_err_t
linux_unload (void)
{
grub_dl_unref (my_mod);
grub_free (linux_args);
linux_args = NULL;
initrd_start = initrd_end = 0;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
int size;
grub_err_t err;
grub_file_t file;
grub_dl_ref (my_mod);
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
file = grub_file_open (argv[0]);
if (!file)
goto fail;
err = linux_load (argv[0], file);
grub_file_close (file);
if (err)
goto fail;
grub_loader_set (linux_boot, linux_unload, 0);
size = grub_loader_cmdline_size (argc, argv);
linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
if (!linux_args)
{
grub_loader_unset();
goto fail;
}
/* Create kernel command line. */
grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
grub_create_loader_cmdline (argc, argv,
linux_args + sizeof (LINUX_IMAGE) - 1, size);
return GRUB_ERR_NONE;
fail:
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_err_t
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t file;
grub_size_t size = 0;
struct grub_linux_initrd_context initrd_ctx;
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
file = grub_file_open (argv[0]);
if (!file)
return grub_errno;
if (grub_initrd_init (argc, argv, &initrd_ctx))
goto fail;
size = grub_get_initrd_size (&initrd_ctx);
if (initrd_start)
grub_free ((void *) initrd_start);
#ifdef GRUB_MACHINE_EFI
initrd_start = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_INITRD_PHYS_OFFSET, size);
if (!initrd_start)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
goto fail;
}
#else
initrd_start = LINUX_INITRD_ADDRESS;
#endif
grub_dprintf ("loader", "Loading initrd to 0x%08x\n",
(grub_addr_t) initrd_start);
if (grub_initrd_load (&initrd_ctx, argv, (void *) initrd_start))
goto fail;
initrd_end = initrd_start + size;
return GRUB_ERR_NONE;
fail:
grub_file_close (file);
return grub_errno;
}
static grub_err_t
load_dtb (grub_file_t dtb, int size)
{
if ((grub_file_read (dtb, fdt_addr, size) != size)
|| (grub_fdt_check_header (fdt_addr, size) != 0))
return grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
grub_fdt_set_totalsize (fdt_addr, size);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t dtb;
int size;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
dtb = grub_file_open (argv[0]);
if (!dtb)
goto out;
size = grub_file_size (dtb);
if (size == 0)
{
grub_error (GRUB_ERR_BAD_OS, "empty file");
goto out;
}
#ifdef GRUB_MACHINE_EFI
fdt_addr = grub_efi_allocate_loader_memory (LINUX_FDT_PHYS_OFFSET, size);
if (!fdt_addr)
{
grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
goto out;
}
#else
fdt_addr = (void *) LINUX_FDT_ADDRESS;
#endif
grub_dprintf ("loader", "Loading device tree to 0x%08x\n",
(grub_addr_t) fdt_addr);
load_dtb (dtb, size);
if (grub_errno != GRUB_ERR_NONE)
{
fdt_addr = NULL;
goto out;
}
/*
* We've successfully loaded an FDT, so any machine type passed
* from firmware is now obsolete.
*/
machine_type = ARM_FDT_MACHINE_TYPE;
out:
grub_file_close (dtb);
return grub_errno;
}
static grub_command_t cmd_linux, cmd_initrd, cmd_devicetree;
GRUB_MOD_INIT (linux)
{
cmd_linux = grub_register_command ("linux", grub_cmd_linux,
0, N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
0, N_("Load initrd."));
cmd_devicetree = grub_register_command ("devicetree", grub_cmd_devicetree,
/* TRANSLATORS: DTB stands for device tree blob. */
0, N_("Load DTB file."));
my_mod = mod;
fdt_addr = (void *) firmware_get_boot_data ();
machine_type = firmware_get_machine_type ();
}
GRUB_MOD_FINI (linux)
{
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
grub_unregister_command (cmd_devicetree);
}
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