[1823] 2008-08-21 Robert Millan <[email protected]>
Robert Millan <[email protected]>
| Newsgroups | gmane.comp.boot-loaders.grub.cvs |
|---|---|
| Message-ID | <[email protected]> |
Revision: 1823
http://svn.sv.gnu.org/viewvc/?view=rev&root=grub&revision=1823
Author: robertmh
Date: 2008-08-21 13:18:07 +0000 (Thu, 21 Aug 2008)
Log Message:
-----------
2008-08-21 Robert Millan <[email protected]>
* loader/i386/linux.c: New file. Implements generic 32-bit Linux
loader.
* conf/i386-coreboot.rmk (_linux_mod_SOURCES): Replace
`loader/i386/pc/linux.c' with `loader/i386/linux.c'.
Modified Paths:
--------------
trunk/grub2/ChangeLog
trunk/grub2/DISTLIST
trunk/grub2/conf/i386-coreboot.mk
trunk/grub2/conf/i386-coreboot.rmk
Added Paths:
-----------
trunk/grub2/loader/i386/linux.c
Modified: trunk/grub2/ChangeLog
===================================================================
--- trunk/grub2/ChangeLog 2008-08-20 10:07:56 UTC (rev 1822)
+++ trunk/grub2/ChangeLog 2008-08-21 13:18:07 UTC (rev 1823)
@@ -1,3 +1,10 @@
+2008-08-21 Robert Millan <[email protected]>
+
+ * loader/i386/linux.c: New file. Implements generic 32-bit Linux
+ loader.
+ * conf/i386-coreboot.rmk (_linux_mod_SOURCES): Replace
+ `loader/i386/pc/linux.c' with `loader/i386/linux.c'.
+
2008-08-20 Carles Pina i Estany <[email protected]>
* menu/normal.c (run_menu): Replace hardcoded numbers with macros
Modified: trunk/grub2/DISTLIST
===================================================================
--- trunk/grub2/DISTLIST 2008-08-20 10:07:56 UTC (rev 1822)
+++ trunk/grub2/DISTLIST 2008-08-21 13:18:07 UTC (rev 1823)
@@ -353,6 +353,7 @@
loader/efi/chainloader_normal.c
loader/i386/bsd.c
loader/i386/bsd_normal.c
+loader/i386/linux.c
loader/i386/efi/linux.c
loader/i386/ieee1275/linux.c
loader/i386/pc/chainloader.c
Modified: trunk/grub2/conf/i386-coreboot.mk
===================================================================
--- trunk/grub2/conf/i386-coreboot.mk 2008-08-20 10:07:56 UTC (rev 1822)
+++ trunk/grub2/conf/i386-coreboot.mk 2008-08-21 13:18:07 UTC (rev 1823)
@@ -561,13 +561,13 @@
halt.mod datetime.mod date.mod datehook.mod
# For _linux.mod.
-_linux_mod_SOURCES = loader/i386/pc/linux.c
-CLEANFILES += _linux.mod mod-_linux.o mod-_linux.c pre-_linux.o _linux_mod-loader_i386_pc_linux.o und-_linux.lst
+_linux_mod_SOURCES = loader/i386/linux.c
+CLEANFILES += _linux.mod mod-_linux.o mod-_linux.c pre-_linux.o _linux_mod-loader_i386_linux.o und-_linux.lst
ifneq ($(_linux_mod_EXPORTS),no)
CLEANFILES += def-_linux.lst
DEFSYMFILES += def-_linux.lst
endif
-MOSTLYCLEANFILES += _linux_mod-loader_i386_pc_linux.d
+MOSTLYCLEANFILES += _linux_mod-loader_i386_linux.d
UNDSYMFILES += und-_linux.lst
_linux.mod: pre-_linux.o mod-_linux.o $(TARGET_OBJ2ELF)
@@ -576,9 +576,9 @@
if test ! -z $(TARGET_OBJ2ELF); then ./$(TARGET_OBJ2ELF) $@ || (rm -f $@; exit 1); fi
$(STRIP) --strip-unneeded -K grub_mod_init -K grub_mod_fini -K _grub_mod_init -K _grub_mod_fini -R .note -R .comment $@
-pre-_linux.o: $(_linux_mod_DEPENDENCIES) _linux_mod-loader_i386_pc_linux.o
+pre-_linux.o: $(_linux_mod_DEPENDENCIES) _linux_mod-loader_i386_linux.o
-rm -f $@
- $(TARGET_CC) $(_linux_mod_LDFLAGS) $(TARGET_LDFLAGS) -Wl,-r,-d -o $@ _linux_mod-loader_i386_pc_linux.o
+ $(TARGET_CC) $(_linux_mod_LDFLAGS) $(TARGET_LDFLAGS) -Wl,-r,-d -o $@ _linux_mod-loader_i386_linux.o
mod-_linux.o: mod-_linux.c
$(TARGET_CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -c -o $@ $<
@@ -595,23 +595,23 @@
echo '_linux' > $@
$(NM) -u -P -p $< | cut -f1 -d' ' >> $@
-_linux_mod-loader_i386_pc_linux.o: loader/i386/pc/linux.c $(loader/i386/pc/linux.c_DEPENDENCIES)
- $(TARGET_CC) -Iloader/i386/pc -I$(srcdir)/loader/i386/pc $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -MD -c -o $@ $<
--include _linux_mod-loader_i386_pc_linux.d
+_linux_mod-loader_i386_linux.o: loader/i386/linux.c $(loader/i386/linux.c_DEPENDENCIES)
+ $(TARGET_CC) -Iloader/i386 -I$(srcdir)/loader/i386 $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -MD -c -o $@ $<
+-include _linux_mod-loader_i386_linux.d
-CLEANFILES += cmd-_linux_mod-loader_i386_pc_linux.lst fs-_linux_mod-loader_i386_pc_linux.lst partmap-_linux_mod-loader_i386_pc_linux.lst
-COMMANDFILES += cmd-_linux_mod-loader_i386_pc_linux.lst
-FSFILES += fs-_linux_mod-loader_i386_pc_linux.lst
-PARTMAPFILES += partmap-_linux_mod-loader_i386_pc_linux.lst
+CLEANFILES += cmd-_linux_mod-loader_i386_linux.lst fs-_linux_mod-loader_i386_linux.lst partmap-_linux_mod-loader_i386_linux.lst
+COMMANDFILES += cmd-_linux_mod-loader_i386_linux.lst
+FSFILES += fs-_linux_mod-loader_i386_linux.lst
+PARTMAPFILES += partmap-_linux_mod-loader_i386_linux.lst
-cmd-_linux_mod-loader_i386_pc_linux.lst: loader/i386/pc/linux.c $(loader/i386/pc/linux.c_DEPENDENCIES) gencmdlist.sh
- set -e; $(TARGET_CC) -Iloader/i386/pc -I$(srcdir)/loader/i386/pc $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/gencmdlist.sh _linux > $@ || (rm -f $@; exit 1)
+cmd-_linux_mod-loader_i386_linux.lst: loader/i386/linux.c $(loader/i386/linux.c_DEPENDENCIES) gencmdlist.sh
+ set -e; $(TARGET_CC) -Iloader/i386 -I$(srcdir)/loader/i386 $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/gencmdlist.sh _linux > $@ || (rm -f $@; exit 1)
-fs-_linux_mod-loader_i386_pc_linux.lst: loader/i386/pc/linux.c $(loader/i386/pc/linux.c_DEPENDENCIES) genfslist.sh
- set -e; $(TARGET_CC) -Iloader/i386/pc -I$(srcdir)/loader/i386/pc $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/genfslist.sh _linux > $@ || (rm -f $@; exit 1)
+fs-_linux_mod-loader_i386_linux.lst: loader/i386/linux.c $(loader/i386/linux.c_DEPENDENCIES) genfslist.sh
+ set -e; $(TARGET_CC) -Iloader/i386 -I$(srcdir)/loader/i386 $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/genfslist.sh _linux > $@ || (rm -f $@; exit 1)
-partmap-_linux_mod-loader_i386_pc_linux.lst: loader/i386/pc/linux.c $(loader/i386/pc/linux.c_DEPENDENCIES) genpartmaplist.sh
- set -e; $(TARGET_CC) -Iloader/i386/pc -I$(srcdir)/loader/i386/pc $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/genpartmaplist.sh _linux > $@ || (rm -f $@; exit 1)
+partmap-_linux_mod-loader_i386_linux.lst: loader/i386/linux.c $(loader/i386/linux.c_DEPENDENCIES) genpartmaplist.sh
+ set -e; $(TARGET_CC) -Iloader/i386 -I$(srcdir)/loader/i386 $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(_linux_mod_CFLAGS) -E $< | sh $(srcdir)/genpartmaplist.sh _linux > $@ || (rm -f $@; exit 1)
_linux_mod_CFLAGS = $(COMMON_CFLAGS)
Modified: trunk/grub2/conf/i386-coreboot.rmk
===================================================================
--- trunk/grub2/conf/i386-coreboot.rmk 2008-08-20 10:07:56 UTC (rev 1822)
+++ trunk/grub2/conf/i386-coreboot.rmk 2008-08-21 13:18:07 UTC (rev 1823)
@@ -98,7 +98,7 @@
halt.mod datetime.mod date.mod datehook.mod
# For _linux.mod.
-_linux_mod_SOURCES = loader/i386/pc/linux.c
+_linux_mod_SOURCES = loader/i386/linux.c
_linux_mod_CFLAGS = $(COMMON_CFLAGS)
_linux_mod_LDFLAGS = $(COMMON_LDFLAGS)
Copied: trunk/grub2/loader/i386/linux.c (from rev 1822, trunk/grub2/loader/i386/efi/linux.c)
===================================================================
--- trunk/grub2/loader/i386/linux.c (rev 0)
+++ trunk/grub2/loader/i386/linux.c 2008-08-21 13:18:07 UTC (rev 1823)
@@ -0,0 +1,570 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2006,2007,2008 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/loader.h>
+#include <grub/machine/memory.h>
+#include <grub/machine/loader.h>
+#include <grub/file.h>
+#include <grub/disk.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/types.h>
+#include <grub/rescue.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/term.h>
+#include <grub/cpu/linux.h>
+
+#define GRUB_LINUX_CL_OFFSET 0x1000
+#define GRUB_LINUX_CL_END_OFFSET 0x2000
+
+static grub_dl_t my_mod;
+
+static grub_size_t linux_mem_size;
+static int loaded;
+static void *real_mode_mem;
+static void *prot_mode_mem;
+static void *initrd_mem;
+static grub_uint32_t real_mode_pages;
+static grub_uint32_t prot_mode_pages;
+static grub_uint32_t initrd_pages;
+
+static grub_uint8_t gdt[] __attribute__ ((aligned(16))) =
+ {
+ /* NULL. */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* Reserved. */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ /* Code segment. */
+ 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9A, 0xCF, 0x00,
+ /* Data segment. */
+ 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x92, 0xCF, 0x00
+ };
+
+struct gdt_descriptor
+{
+ grub_uint16_t limit;
+ void *base;
+} __attribute__ ((packed));
+
+static struct gdt_descriptor gdt_desc =
+ {
+ sizeof (gdt) - 1,
+ gdt
+ };
+
+struct idt_descriptor
+{
+ grub_uint16_t limit;
+ void *base;
+} __attribute__ ((packed));
+
+static struct idt_descriptor idt_desc =
+ {
+ 0,
+ 0
+ };
+
+static inline grub_size_t
+page_align (grub_size_t size)
+{
+ return (size + (1 << 12) - 1) & (~((1 << 12) - 1));
+}
+
+/* Find the optimal number of pages for the memory map. */
+static grub_size_t
+find_mmap_size (void)
+{
+ grub_size_t count = 0, mmap_size;
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr __attribute__ ((unused)),
+ grub_uint64_t size __attribute__ ((unused)),
+ grub_uint32_t type __attribute__ ((unused)))
+ {
+ count++;
+ return 0;
+ }
+
+ grub_machine_mmap_iterate (hook);
+
+ mmap_size = count * sizeof (struct grub_e820_mmap);
+
+ /* Increase the size a bit for safety, because GRUB allocates more on
+ later. */
+ mmap_size += (1 << 12);
+
+ return page_align (mmap_size);
+}
+
+static void
+free_pages (void)
+{
+ real_mode_mem = prot_mode_mem = initrd_mem = 0;
+}
+
+/* Allocate pages for the real mode code and the protected mode code
+ for linux as well as a memory map buffer. */
+static int
+allocate_pages (grub_size_t prot_size)
+{
+ grub_size_t real_size, mmap_size;
+
+ /* Make sure that each size is aligned to a page boundary. */
+ real_size = GRUB_LINUX_CL_END_OFFSET;
+ prot_size = page_align (prot_size);
+ mmap_size = find_mmap_size ();
+
+ grub_dprintf ("linux", "real_size = %x, prot_size = %x, mmap_size = %x\n",
+ (unsigned) real_size, (unsigned) prot_size, (unsigned) mmap_size);
+
+ /* Calculate the number of pages; Combine the real mode code with
+ the memory map buffer for simplicity. */
+ real_mode_pages = ((real_size + mmap_size) >> 12);
+ prot_mode_pages = (prot_size >> 12);
+
+ /* Initialize the memory pointers with NULL for convenience. */
+ real_mode_mem = 0;
+ prot_mode_mem = 0;
+
+ real_mode_mem = grub_malloc (real_mode_pages << 12);
+
+ if (! real_mode_mem)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate real mode pages");
+ goto fail;
+ }
+
+ /* Next, find free pages for the protected mode code. */
+ /* XXX what happens if anything is using this address? */
+ prot_mode_mem = (void *) 0x100000;
+ if (! prot_mode_mem)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "cannot allocate protected mode pages");
+ goto fail;
+ }
+
+ grub_dprintf ("linux", "real_mode_mem = %lx, real_mode_pages = %x, "
+ "prot_mode_mem = %lx, prot_mode_pages = %x\n",
+ (unsigned long) real_mode_mem, (unsigned) real_mode_pages,
+ (unsigned long) prot_mode_mem, (unsigned) prot_mode_pages);
+
+ return 1;
+
+ fail:
+ free_pages ();
+ return 0;
+}
+
+static void
+grub_e820_add_region (struct grub_e820_mmap *e820_map, int *e820_num,
+ grub_uint64_t start, grub_uint64_t size,
+ grub_uint32_t type)
+{
+ int n = *e820_num;
+
+ if (n >= GRUB_E820_MAX_ENTRY)
+ grub_fatal ("Too many e820 memory map entries");
+
+ if ((n > 0) && (e820_map[n - 1].addr + e820_map[n - 1].size == start) &&
+ (e820_map[n - 1].type == type))
+ e820_map[n - 1].size += size;
+ else
+ {
+ e820_map[n].addr = start;
+ e820_map[n].size = size;
+ e820_map[n].type = type;
+ (*e820_num)++;
+ }
+}
+
+#ifdef __x86_64__
+struct
+{
+ grub_uint32_t kernel_entry;
+ grub_uint32_t kernel_cs;
+} jumpvector;
+#endif
+
+static grub_err_t
+grub_linux32_boot (void)
+{
+ struct linux_kernel_params *params;
+ int e820_num;
+
+ params = real_mode_mem;
+
+ grub_dprintf ("linux", "code32_start = %x, idt_desc = %lx, gdt_desc = %lx\n",
+ (unsigned) params->code32_start,
+ (unsigned long) &(idt_desc.limit),
+ (unsigned long) &(gdt_desc.limit));
+ grub_dprintf ("linux", "idt = %x:%lx, gdt = %x:%lx\n",
+ (unsigned) idt_desc.limit, (unsigned long) idt_desc.base,
+ (unsigned) gdt_desc.limit, (unsigned long) gdt_desc.base);
+
+ auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
+ int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
+ {
+ switch (type)
+ {
+ case GRUB_MACHINE_MEMORY_AVAILABLE:
+ grub_e820_add_region (params->e820_map, &e820_num,
+ addr, size, GRUB_E820_RAM);
+ break;
+
+ default:
+ grub_e820_add_region (params->e820_map, &e820_num,
+ addr, size, GRUB_E820_RESERVED);
+ }
+ return 0;
+ }
+
+ e820_num = 0;
+ grub_machine_mmap_iterate (hook);
+ params->mmap_size = e820_num;
+
+ /* Hardware interrupts are not safe any longer. */
+ asm volatile ("cli" : : );
+
+ /* Load the IDT and the GDT for the bootstrap. */
+ asm volatile ("lidt %0" : : "m" (idt_desc));
+ asm volatile ("lgdt %0" : : "m" (gdt_desc));
+
+#ifdef __x86_64__
+
+ jumpvector.kernel_entry = (grub_uint64_t) grub_linux_real_boot;
+ jumpvector.kernel_cs = 0x10;
+
+ asm volatile ( "mov %0, %%rbx" : : "m" (params->code32_start));
+ asm volatile ( "mov %0, %%rsi" : : "m" (real_mode_mem));
+
+ asm volatile ( "ljmp *%0" : : "m" (jumpvector));
+
+#else
+
+ /* Pass parameters. */
+ asm volatile ("movl %0, %%ecx" : : "m" (params->code32_start));
+ asm volatile ("movl %0, %%esi" : : "m" (real_mode_mem));
+
+ asm volatile ("xorl %%ebx, %%ebx" : : );
+
+ /* Enter Linux. */
+ asm volatile ("jmp *%%ecx" : : );
+
+#endif
+
+ /* Never reach here. */
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_linux_unload (void)
+{
+ free_pages ();
+ grub_dl_unref (my_mod);
+ loaded = 0;
+ return GRUB_ERR_NONE;
+}
+
+void
+grub_rescue_cmd_linux (int argc, char *argv[])
+{
+ grub_file_t file = 0;
+ struct linux_kernel_header lh;
+ struct linux_kernel_params *params;
+ grub_uint8_t setup_sects;
+ grub_size_t real_size, prot_size;
+ grub_ssize_t len;
+ int i;
+ char *dest;
+ int video_type;
+
+ 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 *) &lh, sizeof (lh)) != sizeof (lh))
+ {
+ grub_error (GRUB_ERR_READ_ERROR, "cannot read the linux header");
+ goto fail;
+ }
+
+ if (lh.boot_flag != grub_cpu_to_le16 (0xaa55))
+ {
+ grub_error (GRUB_ERR_BAD_OS, "invalid magic number");
+ goto fail;
+ }
+
+ if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
+ {
+ grub_error (GRUB_ERR_BAD_OS, "too many setup sectors");
+ goto fail;
+ }
+
+ /* FIXME: Is 2.02 recent enough for 32-bit boot? */
+ if (lh.header != grub_cpu_to_le32 (GRUB_LINUX_MAGIC_SIGNATURE)
+ || grub_le_to_cpu16 (lh.version) < 0x0203)
+ {
+ grub_error (GRUB_ERR_BAD_OS, "too old version");
+ goto fail;
+ }
+
+ /* zImage doesn't support 32-bit boot. */
+ if (! (lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL))
+ {
+ grub_error (GRUB_ERR_BAD_OS, "zImage is not supported");
+ goto fail;
+ }
+
+ setup_sects = lh.setup_sects;
+
+ /* If SETUP_SECTS is not set, set it to the default (4). */
+ if (! setup_sects)
+ setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
+
+ real_size = setup_sects << GRUB_DISK_SECTOR_BITS;
+ prot_size = grub_file_size (file) - real_size - GRUB_DISK_SECTOR_SIZE;
+
+ if (! allocate_pages (prot_size))
+ goto fail;
+
+ params = (struct linux_kernel_params *) real_mode_mem;
+ grub_memset (params, 0, GRUB_LINUX_CL_END_OFFSET);
+ grub_memcpy (¶ms->setup_sects, &lh.setup_sects, sizeof (lh) - 0x1F1);
+
+ params->ps_mouse = params->padding10 = 0;
+
+ len = 0x400 - sizeof (lh);
+ if (grub_file_read (file, (char *) real_mode_mem + sizeof (lh), len) != len)
+ {
+ grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
+ goto fail;
+ }
+
+ params->type_of_loader = (LINUX_LOADER_ID_GRUB << 4);
+
+ params->cl_magic = GRUB_LINUX_CL_MAGIC;
+ params->cl_offset = 0x1000;
+ params->cmd_line_ptr = (unsigned long) real_mode_mem + 0x1000;
+ params->ramdisk_image = 0;
+ params->ramdisk_size = 0;
+
+ params->heap_end_ptr = GRUB_LINUX_HEAP_END_OFFSET;
+ params->loadflags |= GRUB_LINUX_FLAG_CAN_USE_HEAP;
+
+ /* These are not needed to be precise, because Linux uses these values
+ only to raise an error when the decompression code cannot find good
+ space. */
+ params->ext_mem = ((32 * 0x100000) >> 10);
+ params->alt_mem = ((32 * 0x100000) >> 10);
+
+ params->video_cursor_x = grub_getxy () >> 8;
+ params->video_cursor_y = grub_getxy () & 0xff;
+ params->video_page = 0; /* ??? */
+ params->video_mode = 0;
+ params->video_width = (grub_getwh () >> 8);
+ params->video_ega_bx = 0;
+ params->video_height = (grub_getwh () & 0xff);
+ params->have_vga = 0;
+ params->font_size = 16; /* XXX */
+
+ /* The other parameters are filled when booting. */
+
+ grub_file_seek (file, real_size + GRUB_DISK_SECTOR_SIZE);
+
+ grub_printf (" [Linux-bzImage, setup=0x%x, size=0x%x]\n",
+ (unsigned) real_size, (unsigned) prot_size);
+
+ /* Detect explicitly specified memory size, if any. */
+ linux_mem_size = 0;
+ video_type = 0;
+ for (i = 1; i < argc; i++)
+ if (grub_memcmp (argv[i], "mem=", 4) == 0)
+ {
+ char *val = argv[i] + 4;
+
+ linux_mem_size = grub_strtoul (val, &val, 0);
+
+ if (grub_errno)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ linux_mem_size = 0;
+ }
+ else
+ {
+ int shift = 0;
+
+ switch (grub_tolower (val[0]))
+ {
+ case 'g':
+ shift += 10;
+ case 'm':
+ shift += 10;
+ case 'k':
+ shift += 10;
+ default:
+ break;
+ }
+
+ /* Check an overflow. */
+ if (linux_mem_size > (~0UL >> shift))
+ linux_mem_size = 0;
+ else
+ linux_mem_size <<= shift;
+ }
+ }
+
+ /* Specify the boot file. */
+ dest = grub_stpcpy ((char *) real_mode_mem + GRUB_LINUX_CL_OFFSET,
+ "BOOT_IMAGE=");
+ dest = grub_stpcpy (dest, argv[0]);
+
+ /* Copy kernel parameters. */
+ for (i = 1;
+ i < argc
+ && dest + grub_strlen (argv[i]) + 1 < ((char *) real_mode_mem
+ + GRUB_LINUX_CL_END_OFFSET);
+ i++)
+ {
+ *dest++ = ' ';
+ dest = grub_stpcpy (dest, argv[i]);
+ }
+
+ len = prot_size;
+ if (grub_file_read (file, (char *) GRUB_LINUX_BZIMAGE_ADDR, len) != len)
+ grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
+
+ if (grub_errno == GRUB_ERR_NONE)
+ {
+ grub_loader_set (grub_linux32_boot, grub_linux_unload, 1);
+ loaded = 1;
+ }
+
+ fail:
+
+ if (file)
+ grub_file_close (file);
+
+ if (grub_errno != GRUB_ERR_NONE)
+ {
+ grub_dl_unref (my_mod);
+ loaded = 0;
+ }
+}
+
+void
+grub_rescue_cmd_initrd (int argc, char *argv[])
+{
+ grub_file_t file = 0;
+ grub_ssize_t size;
+ grub_addr_t addr_min, addr_max;
+ grub_addr_t addr;
+ struct linux_kernel_header *lh;
+
+ if (argc == 0)
+ {
+ grub_error (GRUB_ERR_BAD_ARGUMENT, "No module 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;
+
+ size = grub_file_size (file);
+ initrd_pages = (page_align (size) >> 12);
+
+ lh = (struct linux_kernel_header *) real_mode_mem;
+
+ addr_max = (grub_cpu_to_le32 (lh->initrd_addr_max) << 10);
+ if (linux_mem_size != 0 && linux_mem_size < addr_max)
+ addr_max = linux_mem_size;
+
+ /* Linux 2.3.xx has a bug in the memory range check, so avoid
+ the last page.
+ Linux 2.2.xx has a bug in the memory range check, which is
+ worse than that of Linux 2.3.xx, so avoid the last 64kb. */
+ addr_max -= 0x10000;
+
+ /* Usually, the compression ratio is about 50%. */
+ addr_min = (grub_addr_t) prot_mode_mem + ((prot_mode_pages * 3) << 12)
+ + page_align (size);
+
+ /* FIXME: This doesn't take addr_max & addr_min into account. */
+ addr = (grub_addr_t) grub_malloc (page_align (size));
+
+ if (addr == 0)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, "no free pages available");
+ goto fail;
+ }
+
+ initrd_mem = (void *) addr;
+ if (! initrd_mem)
+ grub_fatal ("cannot allocate pages");
+
+ if (grub_file_read (file, initrd_mem, size) != size)
+ {
+ grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file");
+ goto fail;
+ }
+
+ grub_printf (" [Initrd, addr=0x%x, size=0x%x]\n",
+ (unsigned) addr, (unsigned) size);
+
+ lh->ramdisk_image = addr;
+ lh->ramdisk_size = size;
+ lh->root_dev = 0x0100; /* XXX */
+
+ fail:
+ if (file)
+ grub_file_close (file);
+}
+
+
+GRUB_MOD_INIT(linux)
+{
+ grub_rescue_register_command ("linux",
+ grub_rescue_cmd_linux,
+ "load linux");
+ grub_rescue_register_command ("initrd",
+ grub_rescue_cmd_initrd,
+ "load initrd");
+ my_mod = mod;
+}
+
+GRUB_MOD_FINI(linux)
+{
+ grub_rescue_unregister_command ("linux");
+ grub_rescue_unregister_command ("initrd");
+}