527 lines
13 KiB
C
527 lines
13 KiB
C
/* linux.c - boot Linux */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/fdt.h>
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#include <grub/file.h>
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#include <grub/loader.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/command.h>
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#include <grub/cache.h>
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#include <grub/cpu/linux.h>
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#include <grub/lib/cmdline.h>
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#include <grub/linux.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_dl_t my_mod;
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static grub_addr_t initrd_start;
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static grub_addr_t initrd_end;
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static grub_addr_t linux_addr;
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static grub_size_t linux_size;
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static char *linux_args;
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static grub_uint32_t machine_type;
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static void *fdt_addr;
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typedef void (*kernel_entry_t) (int, unsigned long, void *);
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#define LINUX_ZIMAGE_OFFSET 0x24
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#define LINUX_ZIMAGE_MAGIC 0x016f2818
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#define LINUX_PHYS_OFFSET (0x00008000)
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#define LINUX_INITRD_PHYS_OFFSET (LINUX_PHYS_OFFSET + 0x02000000)
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#define LINUX_FDT_PHYS_OFFSET (LINUX_INITRD_PHYS_OFFSET - 0x10000)
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static grub_size_t
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get_atag_size (grub_uint32_t *atag)
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{
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grub_uint32_t *atag0 = atag;
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while (atag[0] && atag[1])
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atag += atag[0];
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return atag - atag0;
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}
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/*
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* linux_prepare_fdt():
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* Prepares a loaded FDT for being passed to Linux.
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* Merges in command line parameters and sets up initrd addresses.
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*/
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static grub_err_t
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linux_prepare_atag (void)
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{
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grub_uint32_t *atag_orig = (grub_uint32_t *) fdt_addr;
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grub_uint32_t *tmp_atag, *from, *to;
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grub_size_t tmp_size;
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grub_size_t arg_size = grub_strlen (linux_args);
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char *cmdline_orig = NULL;
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grub_size_t cmdline_orig_len = 0;
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/* some place for cmdline, initrd and terminator. */
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tmp_size = get_atag_size (atag_orig) + 20 + (arg_size) / 4;
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tmp_atag = grub_malloc (tmp_size * sizeof (grub_uint32_t));
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if (!tmp_atag)
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return grub_errno;
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for (from = atag_orig, to = tmp_atag; from[0] && from[1];
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from += from[0])
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switch (from[1])
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{
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case 0x54410004:
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case 0x54410005:
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case 0x54420005:
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break;
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case 0x54410009:
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if (*(char *) (from + 2))
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{
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cmdline_orig = (char *) (from + 2);
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cmdline_orig_len = grub_strlen (cmdline_orig) + 1;
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}
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break;
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default:
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grub_memcpy (to, from, sizeof (grub_uint32_t) * from[0]);
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to += from[0];
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break;
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}
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grub_dprintf ("linux", "linux inherited args: '%s'\n",
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cmdline_orig ? : "");
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grub_dprintf ("linux", "linux_args: '%s'\n", linux_args);
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/* Generate and set command line */
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to[0] = 3 + (arg_size + cmdline_orig_len) / 4;
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to[1] = 0x54410009;
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if (cmdline_orig)
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{
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grub_memcpy ((char *) to + 8, cmdline_orig, cmdline_orig_len - 1);
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*((char *) to + 8 + cmdline_orig_len - 1) = ' ';
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}
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grub_memcpy ((char *) to + 8 + cmdline_orig_len, linux_args, arg_size);
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grub_memset ((char *) to + 8 + cmdline_orig_len + arg_size, 0,
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4 - ((arg_size + cmdline_orig_len) & 3));
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to += to[0];
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if (initrd_start && initrd_end)
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{
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/*
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* We're using physical addresses, so even if we have LPAE, we're
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* restricted to a 32-bit address space.
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*/
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grub_dprintf ("loader", "Initrd @ 0x%08x-0x%08x\n",
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initrd_start, initrd_end);
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to[0] = 4;
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to[1] = 0x54420005;
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to[2] = initrd_start;
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to[3] = initrd_end - initrd_start;
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to += 4;
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}
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to[0] = 0;
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to[1] = 0;
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to += 2;
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/* Copy updated FDT to its launch location */
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grub_memcpy (atag_orig, tmp_atag, sizeof (grub_uint32_t) * (to - tmp_atag));
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grub_free (tmp_atag);
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grub_dprintf ("loader", "ATAG updated for Linux boot\n");
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return GRUB_ERR_NONE;
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}
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/*
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* linux_prepare_fdt():
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* Prepares a loaded FDT for being passed to Linux.
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* Merges in command line parameters and sets up initrd addresses.
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*/
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static grub_err_t
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linux_prepare_fdt (void)
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{
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int node;
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int retval;
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int tmp_size;
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void *tmp_fdt;
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tmp_size = grub_fdt_get_totalsize (fdt_addr) + 0x100 + grub_strlen (linux_args);
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tmp_fdt = grub_malloc (tmp_size);
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if (!tmp_fdt)
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return grub_errno;
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grub_memcpy (tmp_fdt, fdt_addr, grub_fdt_get_totalsize (fdt_addr));
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grub_fdt_set_totalsize (tmp_fdt, tmp_size);
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/* Find or create '/chosen' node */
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node = grub_fdt_find_subnode (tmp_fdt, 0, "chosen");
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if (node < 0)
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{
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grub_dprintf ("linux", "No 'chosen' node in FDT - creating.\n");
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node = grub_fdt_add_subnode (tmp_fdt, 0, "chosen");
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if (node < 0)
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goto failure;
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}
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grub_dprintf ("linux", "linux_args: '%s'\n", linux_args);
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/* Generate and set command line */
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retval = grub_fdt_set_prop (tmp_fdt, node, "bootargs", linux_args,
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grub_strlen (linux_args) + 1);
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if (retval)
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goto failure;
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if (initrd_start && initrd_end)
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{
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/*
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* We're using physical addresses, so even if we have LPAE, we're
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* restricted to a 32-bit address space.
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*/
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grub_dprintf ("loader", "Initrd @ 0x%08x-0x%08x\n",
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initrd_start, initrd_end);
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retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-start",
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initrd_start);
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if (retval)
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goto failure;
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retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-end",
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initrd_end);
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if (retval)
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goto failure;
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}
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/* Copy updated FDT to its launch location */
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grub_memcpy (fdt_addr, tmp_fdt, tmp_size);
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grub_free (tmp_fdt);
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grub_dprintf ("loader", "FDT updated for Linux boot\n");
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return GRUB_ERR_NONE;
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failure:
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grub_free (tmp_fdt);
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unable to prepare FDT");
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}
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static grub_err_t
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linux_boot (void)
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{
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kernel_entry_t linuxmain;
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int fdt_valid, atag_valid;
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fdt_valid = (fdt_addr && grub_fdt_check_header_nosize (fdt_addr) == 0);
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atag_valid = ((((grub_uint16_t *) fdt_addr)[3] & ~3) == 0x5440
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&& *((grub_uint32_t *) fdt_addr));
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grub_dprintf ("loader", "atag: %p, %x, %x, %s, %s\n",
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fdt_addr,
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((grub_uint16_t *) fdt_addr)[3],
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*((grub_uint32_t *) fdt_addr),
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(char *) fdt_addr,
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(char *) fdt_addr + 1);
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if (!fdt_valid && machine_type == GRUB_ARM_MACHINE_TYPE_FDT)
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return grub_error (GRUB_ERR_FILE_NOT_FOUND,
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N_("device tree must be supplied (see `devicetree' command)"));
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grub_arch_sync_caches ((void *) linux_addr, linux_size);
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grub_dprintf ("loader", "Kernel at: 0x%x\n", linux_addr);
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if (fdt_valid)
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{
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grub_err_t err;
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err = linux_prepare_fdt ();
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if (err)
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return err;
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grub_dprintf ("loader", "FDT @ 0x%p\n", fdt_addr);
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}
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else if (atag_valid)
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{
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grub_err_t err;
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err = linux_prepare_atag ();
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if (err)
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return err;
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grub_dprintf ("loader", "ATAG @ 0x%p\n", fdt_addr);
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}
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grub_dprintf ("loader", "Jumping to Linux...\n");
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/* Boot the kernel.
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* Arguments to kernel:
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* r0 - 0
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* r1 - machine type
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* r2 - address of DTB
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*/
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linuxmain = (kernel_entry_t) linux_addr;
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#ifdef GRUB_MACHINE_EFI
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{
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grub_err_t err;
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err = grub_efi_prepare_platform();
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if (err != GRUB_ERR_NONE)
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return err;
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}
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#endif
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linuxmain (0, machine_type, fdt_addr);
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return grub_error (GRUB_ERR_BAD_OS, "Linux call returned");
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}
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/*
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* Only support zImage, so no relocations necessary
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*/
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static grub_err_t
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linux_load (const char *filename, grub_file_t file)
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{
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int size;
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size = grub_file_size (file);
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#ifdef GRUB_MACHINE_EFI
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linux_addr = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_PHYS_OFFSET, size);
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if (!linux_addr)
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return grub_errno;
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#else
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linux_addr = LINUX_ADDRESS;
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#endif
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grub_dprintf ("loader", "Loading Linux to 0x%08x\n",
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(grub_addr_t) linux_addr);
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if (grub_file_read (file, (void *) linux_addr, size) != size)
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{
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if (!grub_errno)
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grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
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filename);
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return grub_errno;
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}
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if (size > LINUX_ZIMAGE_OFFSET + 4
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&& *(grub_uint32_t *) (linux_addr + LINUX_ZIMAGE_OFFSET)
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== LINUX_ZIMAGE_MAGIC)
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;
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else if (size > 0x8000 && *(grub_uint32_t *) (linux_addr) == 0xea000006
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&& machine_type == GRUB_ARM_MACHINE_TYPE_RASPBERRY_PI)
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grub_memmove ((void *) linux_addr, (void *) (linux_addr + 0x8000),
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size - 0x8000);
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else
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid zImage"));
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linux_size = size;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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linux_unload (void)
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{
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grub_dl_unref (my_mod);
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grub_free (linux_args);
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linux_args = NULL;
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initrd_start = initrd_end = 0;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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int size;
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grub_err_t err;
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grub_file_t file;
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grub_dl_ref (my_mod);
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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file = grub_file_open (argv[0]);
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if (!file)
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goto fail;
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err = linux_load (argv[0], file);
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grub_file_close (file);
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if (err)
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goto fail;
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grub_loader_set (linux_boot, linux_unload, 0);
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size = grub_loader_cmdline_size (argc, argv);
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linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
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if (!linux_args)
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{
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grub_loader_unset();
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goto fail;
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}
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/* Create kernel command line. */
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grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
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grub_create_loader_cmdline (argc, argv,
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linux_args + sizeof (LINUX_IMAGE) - 1, size);
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return GRUB_ERR_NONE;
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fail:
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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static grub_err_t
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grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file;
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grub_size_t size = 0;
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struct grub_linux_initrd_context initrd_ctx;
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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file = grub_file_open (argv[0]);
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if (!file)
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return grub_errno;
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if (grub_initrd_init (argc, argv, &initrd_ctx))
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goto fail;
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size = grub_get_initrd_size (&initrd_ctx);
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#ifdef GRUB_MACHINE_EFI
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if (initrd_start)
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grub_efi_free_pages (initrd_start,
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(initrd_end - initrd_start + 0xfff) >> 12);
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initrd_start = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_INITRD_PHYS_OFFSET, size);
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if (!initrd_start)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
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goto fail;
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}
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#else
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initrd_start = LINUX_INITRD_ADDRESS;
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#endif
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grub_dprintf ("loader", "Loading initrd to 0x%08x\n",
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(grub_addr_t) initrd_start);
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if (grub_initrd_load (&initrd_ctx, argv, (void *) initrd_start))
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goto fail;
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initrd_end = initrd_start + size;
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return GRUB_ERR_NONE;
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fail:
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grub_file_close (file);
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return grub_errno;
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}
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static grub_err_t
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load_dtb (grub_file_t dtb, int size)
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{
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if ((grub_file_read (dtb, fdt_addr, size) != size)
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|| (grub_fdt_check_header (fdt_addr, size) != 0))
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
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grub_fdt_set_totalsize (fdt_addr, size);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t dtb;
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int size;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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dtb = grub_file_open (argv[0]);
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if (!dtb)
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goto out;
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size = grub_file_size (dtb);
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if (size == 0)
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{
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grub_error (GRUB_ERR_BAD_OS, "empty file");
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goto out;
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}
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#ifdef GRUB_MACHINE_EFI
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fdt_addr = grub_efi_allocate_loader_memory (LINUX_FDT_PHYS_OFFSET, size);
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if (!fdt_addr)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
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goto out;
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}
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#else
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fdt_addr = (void *) LINUX_FDT_ADDRESS;
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#endif
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grub_dprintf ("loader", "Loading device tree to 0x%08x\n",
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(grub_addr_t) fdt_addr);
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load_dtb (dtb, size);
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if (grub_errno != GRUB_ERR_NONE)
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{
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fdt_addr = NULL;
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goto out;
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}
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/*
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* We've successfully loaded an FDT, so any machine type passed
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* from firmware is now obsolete.
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*/
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machine_type = GRUB_ARM_MACHINE_TYPE_FDT;
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out:
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grub_file_close (dtb);
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return grub_errno;
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}
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static grub_command_t cmd_linux, cmd_initrd, cmd_devicetree;
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GRUB_MOD_INIT (linux)
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{
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cmd_linux = grub_register_command ("linux", grub_cmd_linux,
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0, N_("Load Linux."));
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cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
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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 *) grub_arm_firmware_get_boot_data ();
|
|
machine_type = grub_arm_firmware_get_machine_type ();
|
|
}
|
|
|
|
GRUB_MOD_FINI (linux)
|
|
{
|
|
grub_unregister_command (cmd_linux);
|
|
grub_unregister_command (cmd_initrd);
|
|
grub_unregister_command (cmd_devicetree);
|
|
}
|