Adding upstream version 2.06.upstream/2.06upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1128 insertions, 0 deletions

diff --git a/grub-core/loader/multiboot_mbi2.c b/grub-core/loader/multiboot_mbi2.c
new file mode 100644
index 0000000..9a943d7
--- /dev/null
+++ b/grub-core/loader/multiboot_mbi2.c
@@ -0,0 +1,1128 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010,2011,2012,2013  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/memory.h>
+#ifdef GRUB_MACHINE_PCBIOS
+#include <grub/machine/biosnum.h>
+#include <grub/machine/apm.h>
+#include <grub/machine/memory.h>
+#endif
+#include <grub/multiboot2.h>
+#include <grub/cpu/multiboot.h>
+#include <grub/cpu/relocator.h>
+#include <grub/disk.h>
+#include <grub/device.h>
+#include <grub/partition.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/env.h>
+#include <grub/video.h>
+#include <grub/acpi.h>
+#include <grub/i18n.h>
+#include <grub/net.h>
+#include <grub/lib/cmdline.h>
+
+#if defined (GRUB_MACHINE_EFI)
+#include <grub/efi/efi.h>
+#endif
+
+#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_QEMU)
+#include <grub/i386/pc/vbe.h>
+#define HAS_VGA_TEXT 1
+#else
+#define HAS_VGA_TEXT 0
+#endif
+
+#if defined (__i386__) || defined (__x86_64__)
+#define MBI_MIN_ADDR 0x1000
+#else
+#define MBI_MIN_ADDR 0
+#endif
+
+struct module
+{
+  struct module *next;
+  grub_addr_t start;
+  grub_size_t size;
+  char *cmdline;
+  int cmdline_size;
+};
+
+static struct module *modules, *modules_last;
+static grub_size_t cmdline_size;
+static grub_size_t total_modcmd;
+static unsigned modcnt;
+static char *cmdline = NULL;
+static int bootdev_set;
+static grub_uint32_t biosdev, slice, part;
+static grub_size_t elf_sec_num, elf_sec_entsize;
+static unsigned elf_sec_shstrndx;
+static void *elf_sections;
+static int keep_bs = 0;
+static grub_uint32_t load_base_addr;
+
+void
+grub_multiboot2_add_elfsyms (grub_size_t num, grub_size_t entsize,
+			    unsigned shndx, void *data)
+{
+  elf_sec_num = num;
+  elf_sec_shstrndx = shndx;
+  elf_sec_entsize = entsize;
+  elf_sections = data;
+}
+
+static struct multiboot_header *
+find_header (grub_properly_aligned_t *buffer, grub_ssize_t len)
+{
+  struct multiboot_header *header;
+  /* Look for the multiboot header in the buffer.  The header should
+     be at least 12 bytes and aligned on a 4-byte boundary.  */
+  for (header = (struct multiboot_header *) buffer;
+       ((char *) header <= (char *) buffer + len - 12);
+       header = (struct multiboot_header *) ((grub_uint32_t *) header + MULTIBOOT_HEADER_ALIGN / 4))
+    {
+      if (header->magic == MULTIBOOT2_HEADER_MAGIC
+	  && !(header->magic + header->architecture
+	       + header->header_length + header->checksum)
+	  && header->architecture == MULTIBOOT2_ARCHITECTURE_CURRENT)
+	return header;
+    }
+  return NULL;
+}
+
+grub_err_t
+grub_multiboot2_load (grub_file_t file, const char *filename)
+{
+  grub_ssize_t len;
+  struct multiboot_header *header;
+  grub_err_t err;
+  struct multiboot_header_tag *tag;
+  struct multiboot_header_tag_address *addr_tag = NULL;
+  struct multiboot_header_tag_relocatable *rel_tag;
+  int entry_specified = 0, efi_entry_specified = 0;
+  grub_addr_t entry = 0, efi_entry = 0;
+  grub_uint32_t console_required = 0;
+  struct multiboot_header_tag_framebuffer *fbtag = NULL;
+  int accepted_consoles = GRUB_MULTIBOOT2_CONSOLE_EGA_TEXT;
+  mbi_load_data_t mld;
+
+  mld.mbi_ver = 2;
+  mld.relocatable = 0;
+
+  mld.buffer = grub_malloc (MULTIBOOT_SEARCH);
+  if (!mld.buffer)
+    return grub_errno;
+
+  len = grub_file_read (file, mld.buffer, MULTIBOOT_SEARCH);
+  if (len < 32)
+    {
+      grub_free (mld.buffer);
+      return grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), filename);
+    }
+
+  COMPILE_TIME_ASSERT (MULTIBOOT_HEADER_ALIGN % 4 == 0);
+
+  header = find_header (mld.buffer, len);
+
+  if (header == 0)
+    {
+      grub_free (mld.buffer);
+      return grub_error (GRUB_ERR_BAD_ARGUMENT, "no multiboot header found");
+    }
+
+  COMPILE_TIME_ASSERT (MULTIBOOT_TAG_ALIGN % 4 == 0);
+
+  keep_bs = 0;
+
+  for (tag = (struct multiboot_header_tag *) (header + 1);
+       tag->type != MULTIBOOT_TAG_TYPE_END;
+       tag = (struct multiboot_header_tag *) ((grub_uint32_t *) tag + ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN) / 4))
+    switch (tag->type)
+      {
+      case MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST:
+	{
+	  unsigned i;
+	  struct multiboot_header_tag_information_request *request_tag
+	    = (struct multiboot_header_tag_information_request *) tag;
+	  if (request_tag->flags & MULTIBOOT_HEADER_TAG_OPTIONAL)
+	    break;
+	  for (i = 0; i < (request_tag->size - sizeof (*request_tag))
+		 / sizeof (request_tag->requests[0]); i++)
+	    switch (request_tag->requests[i])
+	      {
+	      case MULTIBOOT_TAG_TYPE_END:
+	      case MULTIBOOT_TAG_TYPE_CMDLINE:
+	      case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
+	      case MULTIBOOT_TAG_TYPE_MODULE:
+	      case MULTIBOOT_TAG_TYPE_BASIC_MEMINFO:
+	      case MULTIBOOT_TAG_TYPE_BOOTDEV:
+	      case MULTIBOOT_TAG_TYPE_MMAP:
+	      case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
+	      case MULTIBOOT_TAG_TYPE_VBE:
+	      case MULTIBOOT_TAG_TYPE_ELF_SECTIONS:
+	      case MULTIBOOT_TAG_TYPE_APM:
+	      case MULTIBOOT_TAG_TYPE_EFI32:
+	      case MULTIBOOT_TAG_TYPE_EFI64:
+	      case MULTIBOOT_TAG_TYPE_ACPI_OLD:
+	      case MULTIBOOT_TAG_TYPE_ACPI_NEW:
+	      case MULTIBOOT_TAG_TYPE_NETWORK:
+	      case MULTIBOOT_TAG_TYPE_EFI_MMAP:
+	      case MULTIBOOT_TAG_TYPE_EFI_BS:
+	      case MULTIBOOT_TAG_TYPE_EFI32_IH:
+	      case MULTIBOOT_TAG_TYPE_EFI64_IH:
+	      case MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR:
+		break;
+
+	      default:
+		grub_free (mld.buffer);
+		return grub_error (GRUB_ERR_UNKNOWN_OS,
+				   "unsupported information tag: 0x%x",
+				   request_tag->requests[i]);
+	      }
+	  break;
+	}
+	       
+      case MULTIBOOT_HEADER_TAG_ADDRESS:
+	addr_tag = (struct multiboot_header_tag_address *) tag;
+	break;
+
+      case MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS:
+	entry_specified = 1;
+	entry = ((struct multiboot_header_tag_entry_address *) tag)->entry_addr;
+	break;
+
+      case MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64:
+#if defined (GRUB_MACHINE_EFI) && defined (__x86_64__)
+	efi_entry_specified = 1;
+	efi_entry = ((struct multiboot_header_tag_entry_address *) tag)->entry_addr;
+#endif
+	break;
+
+      case MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS:
+	if (!(((struct multiboot_header_tag_console_flags *) tag)->console_flags
+	    & MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED))
+	  accepted_consoles &= ~GRUB_MULTIBOOT2_CONSOLE_EGA_TEXT;
+	if (((struct multiboot_header_tag_console_flags *) tag)->console_flags
+	    & MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED)
+	  console_required = 1;
+	break;
+
+      case MULTIBOOT_HEADER_TAG_FRAMEBUFFER:
+	fbtag = (struct multiboot_header_tag_framebuffer *) tag;
+	accepted_consoles |= GRUB_MULTIBOOT2_CONSOLE_FRAMEBUFFER;
+	break;
+
+      case MULTIBOOT_HEADER_TAG_RELOCATABLE:
+	mld.relocatable = 1;
+	rel_tag = (struct multiboot_header_tag_relocatable *) tag;
+	mld.min_addr = rel_tag->min_addr;
+	mld.max_addr = rel_tag->max_addr;
+	mld.align = rel_tag->align;
+	switch (rel_tag->preference)
+	  {
+	  case MULTIBOOT_LOAD_PREFERENCE_LOW:
+	    mld.preference = GRUB_RELOCATOR_PREFERENCE_LOW;
+	    break;
+
+	  case MULTIBOOT_LOAD_PREFERENCE_HIGH:
+	    mld.preference = GRUB_RELOCATOR_PREFERENCE_HIGH;
+	    break;
+
+	  default:
+	    mld.preference = GRUB_RELOCATOR_PREFERENCE_NONE;
+	  }
+	break;
+
+	/* GRUB always page-aligns modules.  */
+      case MULTIBOOT_HEADER_TAG_MODULE_ALIGN:
+	break;
+
+      case MULTIBOOT_HEADER_TAG_EFI_BS:
+#ifdef GRUB_MACHINE_EFI
+	keep_bs = 1;
+#endif
+	break;
+
+      default:
+	if (! (tag->flags & MULTIBOOT_HEADER_TAG_OPTIONAL))
+	  {
+	    grub_free (mld.buffer);
+	    return grub_error (GRUB_ERR_UNKNOWN_OS,
+			       "unsupported tag: 0x%x", tag->type);
+	  }
+	break;
+      }
+
+  if (addr_tag && !entry_specified && !(keep_bs && efi_entry_specified))
+    {
+      grub_free (mld.buffer);
+      return grub_error (GRUB_ERR_UNKNOWN_OS,
+			 "load address tag without entry address tag");
+    }
+ 
+  if (addr_tag)
+    {
+      grub_uint64_t load_addr = (addr_tag->load_addr + 1)
+	? addr_tag->load_addr : (addr_tag->header_addr
+				 - ((char *) header - (char *) mld.buffer));
+      int offset = ((char *) header - (char *) mld.buffer -
+	   (addr_tag->header_addr - load_addr));
+      int load_size = ((addr_tag->load_end_addr == 0) ? file->size - offset :
+		       addr_tag->load_end_addr - addr_tag->load_addr);
+      grub_size_t code_size;
+      void *source;
+      grub_relocator_chunk_t ch;
+
+      if (addr_tag->bss_end_addr)
+	code_size = (addr_tag->bss_end_addr - load_addr);
+      else
+	code_size = load_size;
+
+      if (mld.relocatable)
+	{
+	  if (code_size > mld.max_addr || mld.min_addr > mld.max_addr - code_size)
+	    {
+	      grub_free (mld.buffer);
+	      return grub_error (GRUB_ERR_BAD_OS, "invalid min/max address and/or load size");
+	    }
+
+	  err = grub_relocator_alloc_chunk_align_safe (grub_multiboot2_relocator, &ch,
+						       mld.min_addr, mld.max_addr,
+						       code_size, mld.align ? mld.align : 1,
+						       mld.preference, keep_bs);
+	}
+      else
+	err = grub_relocator_alloc_chunk_addr (grub_multiboot2_relocator,
+					       &ch, load_addr, code_size);
+      if (err)
+	{
+	  grub_dprintf ("multiboot_loader", "Error loading aout kludge\n");
+	  grub_free (mld.buffer);
+	  return err;
+	}
+      mld.link_base_addr = load_addr;
+      mld.load_base_addr = get_physical_target_address (ch);
+      source = get_virtual_current_address (ch);
+
+      grub_dprintf ("multiboot_loader", "link_base_addr=0x%x, load_base_addr=0x%x, "
+		    "load_size=0x%lx, relocatable=%d\n", mld.link_base_addr,
+		    mld.load_base_addr, (long) code_size, mld.relocatable);
+
+      if (mld.relocatable)
+	grub_dprintf ("multiboot_loader", "align=0x%lx, preference=0x%x, avoid_efi_boot_services=%d\n",
+		      (long) mld.align, mld.preference, keep_bs);
+
+      if ((grub_file_seek (file, offset)) == (grub_off_t) -1)
+	{
+	  grub_free (mld.buffer);
+	  return grub_errno;
+	}
+
+      grub_file_read (file, source, load_size);
+      if (grub_errno)
+	{
+	  grub_free (mld.buffer);
+	  return grub_errno;
+	}
+
+      if (addr_tag->bss_end_addr)
+	grub_memset ((grub_uint8_t *) source + load_size, 0,
+		     addr_tag->bss_end_addr - load_addr - load_size);
+    }
+  else
+    {
+      mld.file = file;
+      mld.filename = filename;
+      mld.avoid_efi_boot_services = keep_bs;
+      err = grub_multiboot2_load_elf (&mld);
+      if (err)
+	{
+	  grub_free (mld.buffer);
+	  return err;
+	}
+    }
+
+  load_base_addr = mld.load_base_addr;
+
+  if (keep_bs && efi_entry_specified)
+    grub_multiboot2_payload_eip = efi_entry;
+  else if (entry_specified)
+    grub_multiboot2_payload_eip = entry;
+
+  if (mld.relocatable)
+    {
+      /*
+       * Both branches are mathematically equivalent. However, it looks
+       * that real life (C?) is more complicated. I am trying to avoid
+       * wrap around here if mld.load_base_addr < mld.link_base_addr.
+       * If you look at C operator precedence then everything should work.
+       * However, I am not 100% sure that a given compiler will not
+       * optimize/break this stuff. So, maybe we should use signed
+       * 64-bit int here.
+       */
+      if (mld.load_base_addr >= mld.link_base_addr)
+	grub_multiboot2_payload_eip += mld.load_base_addr - mld.link_base_addr;
+      else
+	grub_multiboot2_payload_eip -= mld.link_base_addr - mld.load_base_addr;
+    }
+
+  if (fbtag)
+    err = grub_multiboot2_set_console (GRUB_MULTIBOOT2_CONSOLE_FRAMEBUFFER,
+				       accepted_consoles,
+				       fbtag->width, fbtag->height,
+				       fbtag->depth, console_required);
+  else
+    err = grub_multiboot2_set_console (GRUB_MULTIBOOT2_CONSOLE_EGA_TEXT,
+				       accepted_consoles,
+				       0, 0, 0, console_required);
+  return err;
+}
+
+static grub_size_t
+acpiv2_size (void)
+{
+#if GRUB_MACHINE_HAS_ACPI
+  struct grub_acpi_rsdp_v20 *p = grub_acpi_get_rsdpv2 ();
+
+  if (!p)
+    return 0;
+
+  return ALIGN_UP (sizeof (struct multiboot_tag_old_acpi)
+		   + p->length, MULTIBOOT_TAG_ALIGN);
+#else
+  return 0;
+#endif
+}
+
+#ifdef GRUB_MACHINE_EFI
+
+static grub_efi_uintn_t efi_mmap_size = 0;
+
+#endif
+
+static grub_size_t
+net_size (void)
+{
+  struct grub_net_network_level_interface *net;
+  grub_size_t ret = 0;
+
+  FOR_NET_NETWORK_LEVEL_INTERFACES(net)
+    if (net->dhcp_ack)
+      ret += ALIGN_UP (sizeof (struct multiboot_tag_network) + net->dhcp_acklen,
+		       MULTIBOOT_TAG_ALIGN);
+  return ret;
+}
+
+static grub_size_t
+grub_multiboot2_get_mbi_size (void)
+{
+#ifdef GRUB_MACHINE_EFI
+  if (!keep_bs && !efi_mmap_size)
+    efi_mmap_size = grub_efi_find_mmap_size ();
+#endif
+  return 2 * sizeof (grub_uint32_t) + sizeof (struct multiboot_tag)
+    + sizeof (struct multiboot_tag)
+    + (sizeof (struct multiboot_tag_string)
+       + ALIGN_UP (cmdline_size, MULTIBOOT_TAG_ALIGN))
+    + (sizeof (struct multiboot_tag_string)
+       + ALIGN_UP (sizeof (PACKAGE_STRING), MULTIBOOT_TAG_ALIGN))
+    + (modcnt * sizeof (struct multiboot_tag_module) + total_modcmd)
+    + ALIGN_UP (sizeof (struct multiboot_tag_basic_meminfo),
+		MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_bootdev), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_elf_sections), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (elf_sec_entsize * elf_sec_num, MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP ((sizeof (struct multiboot_tag_mmap)
+		 + grub_multiboot2_get_mmap_count ()
+		 * sizeof (struct multiboot_mmap_entry)), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_framebuffer), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_old_acpi)
+		+ sizeof (struct grub_acpi_rsdp_v10), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_load_base_addr), MULTIBOOT_TAG_ALIGN)
+    + acpiv2_size ()
+    + net_size ()
+#ifdef GRUB_MACHINE_EFI
+    + ALIGN_UP (sizeof (struct multiboot_tag_efi32), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_efi32_ih), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_efi64), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_efi64_ih), MULTIBOOT_TAG_ALIGN)
+    + ALIGN_UP (sizeof (struct multiboot_tag_efi_mmap)
+		+ efi_mmap_size, MULTIBOOT_TAG_ALIGN)
+#endif
+    + sizeof (struct multiboot_tag_vbe) + MULTIBOOT_TAG_ALIGN - 1
+    + sizeof (struct multiboot_tag_apm) + MULTIBOOT_TAG_ALIGN - 1;
+}
+
+/* Helper for grub_fill_multiboot_mmap.  */
+static int
+grub_fill_multiboot_mmap_iter (grub_uint64_t addr, grub_uint64_t size,
+			       grub_memory_type_t type, void *data)
+{
+  struct multiboot_mmap_entry **mmap_entry = data;
+
+  (*mmap_entry)->addr = addr;
+  (*mmap_entry)->len = size;
+  (*mmap_entry)->type = type;
+  (*mmap_entry)->zero = 0;
+  (*mmap_entry)++;
+
+  return 0;
+}
+
+/* Fill previously allocated Multiboot mmap.  */
+static void
+grub_fill_multiboot_mmap (struct multiboot_tag_mmap *tag)
+{
+  struct multiboot_mmap_entry *mmap_entry = tag->entries;
+
+  tag->type = MULTIBOOT_TAG_TYPE_MMAP;
+  tag->size = sizeof (struct multiboot_tag_mmap)
+    + sizeof (struct multiboot_mmap_entry) * grub_multiboot2_get_mmap_count (); 
+  tag->entry_size = sizeof (struct multiboot_mmap_entry);
+  tag->entry_version = 0;
+
+  grub_mmap_iterate (grub_fill_multiboot_mmap_iter, &mmap_entry);
+}
+
+#if defined (GRUB_MACHINE_PCBIOS)
+static void
+fill_vbe_tag (struct multiboot_tag_vbe *tag)
+{
+  grub_vbe_status_t status;
+  void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+
+  tag->type = MULTIBOOT_TAG_TYPE_VBE;
+  tag->size = 0;
+    
+  status = grub_vbe_bios_get_controller_info (scratch);
+  if (status != GRUB_VBE_STATUS_OK)
+    return;
+  
+  grub_memcpy (&tag->vbe_control_info, scratch,
+	       sizeof (struct grub_vbe_info_block));
+  
+  status = grub_vbe_bios_get_mode (scratch);
+  tag->vbe_mode = *(grub_uint32_t *) scratch;
+  if (status != GRUB_VBE_STATUS_OK)
+    return;
+
+  /* get_mode_info isn't available for mode 3.  */
+  if (tag->vbe_mode == 3)
+    {
+      struct grub_vbe_mode_info_block *mode_info = (void *) &tag->vbe_mode_info;
+      grub_memset (mode_info, 0,
+		   sizeof (struct grub_vbe_mode_info_block));
+      mode_info->memory_model = GRUB_VBE_MEMORY_MODEL_TEXT;
+      mode_info->x_resolution = 80;
+      mode_info->y_resolution = 25;
+    }
+  else
+    {
+      status = grub_vbe_bios_get_mode_info (tag->vbe_mode, scratch);
+      if (status != GRUB_VBE_STATUS_OK)
+	return;
+      grub_memcpy (&tag->vbe_mode_info, scratch,
+		   sizeof (struct grub_vbe_mode_info_block));
+    }      
+  grub_vbe_bios_get_pm_interface (&tag->vbe_interface_seg,
+				  &tag->vbe_interface_off,
+				  &tag->vbe_interface_len);
+
+  tag->size = sizeof (*tag);
+}
+#endif
+
+static grub_err_t
+retrieve_video_parameters (grub_properly_aligned_t **ptrorig)
+{
+  grub_err_t err;
+  struct grub_video_mode_info mode_info;
+  void *framebuffer;
+  grub_video_driver_id_t driv_id;
+  struct grub_video_palette_data palette[256];
+  struct multiboot_tag_framebuffer *tag
+    = (struct multiboot_tag_framebuffer *) *ptrorig;
+
+  err = grub_multiboot2_set_video_mode ();
+  if (err)
+    {
+      grub_print_error ();
+      grub_errno = GRUB_ERR_NONE;
+    }
+
+  grub_video_get_palette (0, ARRAY_SIZE (palette), palette);
+
+  driv_id = grub_video_get_driver_id ();
+#if HAS_VGA_TEXT
+  if (driv_id == GRUB_VIDEO_DRIVER_NONE)
+    {
+      struct grub_vbe_mode_info_block vbe_mode_info;
+      grub_uint32_t vbe_mode;
+
+#if defined (GRUB_MACHINE_PCBIOS)
+      {
+	grub_vbe_status_t status;
+	void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+	status = grub_vbe_bios_get_mode (scratch);
+	vbe_mode = *(grub_uint32_t *) scratch;
+	if (status != GRUB_VBE_STATUS_OK)
+	  return GRUB_ERR_NONE;
+      }
+#else
+      vbe_mode = 3;
+#endif
+
+      /* get_mode_info isn't available for mode 3.  */
+      if (vbe_mode == 3)
+	{
+	  grub_memset (&vbe_mode_info, 0,
+		       sizeof (struct grub_vbe_mode_info_block));
+	  vbe_mode_info.memory_model = GRUB_VBE_MEMORY_MODEL_TEXT;
+	  vbe_mode_info.x_resolution = 80;
+	  vbe_mode_info.y_resolution = 25;
+	}
+#if defined (GRUB_MACHINE_PCBIOS)
+      else
+	{
+	  grub_vbe_status_t status;
+	  void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+	  status = grub_vbe_bios_get_mode_info (vbe_mode, scratch);
+	  if (status != GRUB_VBE_STATUS_OK)
+	    return GRUB_ERR_NONE;
+	  grub_memcpy (&vbe_mode_info, scratch,
+		       sizeof (struct grub_vbe_mode_info_block));
+	}
+#endif
+
+      if (vbe_mode_info.memory_model == GRUB_VBE_MEMORY_MODEL_TEXT)
+	{
+	  tag = (struct multiboot_tag_framebuffer *) *ptrorig;
+	  tag->common.type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER;
+	  tag->common.size = 0;
+
+	  tag->common.framebuffer_addr = 0xb8000;
+	  
+	  tag->common.framebuffer_pitch = 2 * vbe_mode_info.x_resolution;	
+	  tag->common.framebuffer_width = vbe_mode_info.x_resolution;
+	  tag->common.framebuffer_height = vbe_mode_info.y_resolution;
+
+	  tag->common.framebuffer_bpp = 16;
+	  
+	  tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT;
+	  tag->common.size = sizeof (tag->common);
+	  tag->common.reserved = 0;
+	  *ptrorig += ALIGN_UP (tag->common.size, MULTIBOOT_TAG_ALIGN)
+	    / sizeof (grub_properly_aligned_t);
+	}
+      return GRUB_ERR_NONE;
+    }
+#else
+  if (driv_id == GRUB_VIDEO_DRIVER_NONE)
+    return GRUB_ERR_NONE;
+#endif
+
+#if GRUB_MACHINE_HAS_VBE
+  {
+    struct multiboot_tag_vbe *tag_vbe = (struct multiboot_tag_vbe *) *ptrorig;
+
+    fill_vbe_tag (tag_vbe);
+
+    *ptrorig += ALIGN_UP (tag_vbe->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+#endif
+
+  err = grub_video_get_info_and_fini (&mode_info, &framebuffer);
+  if (err)
+    return err;
+
+  tag = (struct multiboot_tag_framebuffer *) *ptrorig;
+  tag->common.type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER;
+  tag->common.size = 0;
+
+  tag->common.framebuffer_addr = (grub_addr_t) framebuffer;
+  tag->common.framebuffer_pitch = mode_info.pitch;
+
+  tag->common.framebuffer_width = mode_info.width;
+  tag->common.framebuffer_height = mode_info.height;
+
+  tag->common.framebuffer_bpp = mode_info.bpp;
+
+  tag->common.reserved = 0;
+      
+  if (mode_info.mode_type & GRUB_VIDEO_MODE_TYPE_INDEX_COLOR)
+    {
+      unsigned i;
+      tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED;
+      tag->framebuffer_palette_num_colors = mode_info.number_of_colors;
+      if (tag->framebuffer_palette_num_colors > ARRAY_SIZE (palette))
+	tag->framebuffer_palette_num_colors = ARRAY_SIZE (palette);
+      tag->common.size = sizeof (struct multiboot_tag_framebuffer_common)
+	+ sizeof (multiboot_uint16_t) + tag->framebuffer_palette_num_colors
+	* sizeof (struct multiboot_color);
+      for (i = 0; i < tag->framebuffer_palette_num_colors; i++)
+	{
+	  tag->framebuffer_palette[i].red = palette[i].r;
+	  tag->framebuffer_palette[i].green = palette[i].g;
+	  tag->framebuffer_palette[i].blue = palette[i].b;
+	}
+    }
+  else
+    {
+      tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB;
+      tag->framebuffer_red_field_position = mode_info.red_field_pos;
+      tag->framebuffer_red_mask_size = mode_info.red_mask_size;
+      tag->framebuffer_green_field_position = mode_info.green_field_pos;
+      tag->framebuffer_green_mask_size = mode_info.green_mask_size;
+      tag->framebuffer_blue_field_position = mode_info.blue_field_pos;
+      tag->framebuffer_blue_mask_size = mode_info.blue_mask_size;
+
+      tag->common.size = sizeof (struct multiboot_tag_framebuffer_common) + 6;
+    }
+  *ptrorig += ALIGN_UP (tag->common.size, MULTIBOOT_TAG_ALIGN)
+    / sizeof (grub_properly_aligned_t);
+
+  return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_multiboot2_make_mbi (grub_uint32_t *target)
+{
+  grub_properly_aligned_t *ptrorig;
+  grub_properly_aligned_t *mbistart;
+  grub_err_t err;
+  grub_size_t bufsize;
+  grub_relocator_chunk_t ch;
+
+  bufsize = grub_multiboot2_get_mbi_size ();
+
+  COMPILE_TIME_ASSERT (MULTIBOOT_TAG_ALIGN % sizeof (grub_properly_aligned_t) == 0);
+
+  err = grub_relocator_alloc_chunk_align (grub_multiboot2_relocator, &ch,
+					  MBI_MIN_ADDR, UP_TO_TOP32 (bufsize),
+					  bufsize, MULTIBOOT_TAG_ALIGN,
+					  GRUB_RELOCATOR_PREFERENCE_NONE, 1);
+  if (err)
+    return err;
+
+  ptrorig = get_virtual_current_address (ch);
+#if defined (__i386__) || defined (__x86_64__)
+  *target = get_physical_target_address (ch);
+#elif defined (__mips)
+  *target = get_physical_target_address (ch) | 0x80000000;
+#else
+#error Please complete this
+#endif
+
+  mbistart = ptrorig;
+  COMPILE_TIME_ASSERT ((2 * sizeof (grub_uint32_t))
+		       % sizeof (grub_properly_aligned_t) == 0);
+  COMPILE_TIME_ASSERT (MULTIBOOT_TAG_ALIGN
+		       % sizeof (grub_properly_aligned_t) == 0);
+  ptrorig += (2 * sizeof (grub_uint32_t)) / sizeof (grub_properly_aligned_t);
+
+  {
+    struct multiboot_tag_load_base_addr *tag = (struct multiboot_tag_load_base_addr *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR;
+    tag->size = sizeof (struct multiboot_tag_load_base_addr);
+    tag->load_base_addr = load_base_addr;
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+       / sizeof (grub_properly_aligned_t);
+  }
+
+  {
+    struct multiboot_tag_string *tag = (struct multiboot_tag_string *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_CMDLINE;
+    tag->size = sizeof (struct multiboot_tag_string) + cmdline_size; 
+    grub_memcpy (tag->string, cmdline, cmdline_size);
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+       / sizeof (grub_properly_aligned_t);
+  }
+
+  {
+    struct multiboot_tag_string *tag = (struct multiboot_tag_string *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME;
+    tag->size = sizeof (struct multiboot_tag_string) + sizeof (PACKAGE_STRING); 
+    grub_memcpy (tag->string, PACKAGE_STRING, sizeof (PACKAGE_STRING));
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+
+#ifdef GRUB_MACHINE_PCBIOS
+  {
+    struct grub_apm_info info;
+    if (grub_apm_get_info (&info))
+      {
+	struct multiboot_tag_apm *tag = (struct multiboot_tag_apm *) ptrorig;
+
+	tag->type = MULTIBOOT_TAG_TYPE_APM;
+	tag->size = sizeof (struct multiboot_tag_apm); 
+
+	tag->cseg = info.cseg;
+	tag->offset = info.offset;
+	tag->cseg_16 = info.cseg_16;
+	tag->dseg = info.dseg;
+	tag->flags = info.flags;
+	tag->cseg_len = info.cseg_len;
+	tag->dseg_len = info.dseg_len;
+	tag->cseg_16_len = info.cseg_16_len;
+	tag->version = info.version;
+
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+  }
+#endif
+
+  {
+    unsigned i;
+    struct module *cur;
+
+    for (i = 0, cur = modules; i < modcnt; i++, cur = cur->next)
+      {
+	struct multiboot_tag_module *tag
+	  = (struct multiboot_tag_module *) ptrorig;
+	tag->type = MULTIBOOT_TAG_TYPE_MODULE;
+	tag->size = sizeof (struct multiboot_tag_module) + cur->cmdline_size;
+	tag->mod_start = cur->start;
+	tag->mod_end = tag->mod_start + cur->size;
+	grub_memcpy (tag->cmdline, cur->cmdline, cur->cmdline_size);
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+  }
+
+  if (!keep_bs)
+    {
+      struct multiboot_tag_mmap *tag = (struct multiboot_tag_mmap *) ptrorig;
+      grub_fill_multiboot_mmap (tag);
+      ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	/ sizeof (grub_properly_aligned_t);
+    }
+
+  {
+    struct multiboot_tag_elf_sections *tag
+      = (struct multiboot_tag_elf_sections *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_ELF_SECTIONS;
+    tag->size = sizeof (struct multiboot_tag_elf_sections)
+      + elf_sec_entsize * elf_sec_num;
+    grub_memcpy (tag->sections, elf_sections, elf_sec_entsize * elf_sec_num);
+    tag->num = elf_sec_num;
+    tag->entsize = elf_sec_entsize;
+    tag->shndx = elf_sec_shstrndx;
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+
+  if (!keep_bs)
+    {
+      struct multiboot_tag_basic_meminfo *tag
+	= (struct multiboot_tag_basic_meminfo *) ptrorig;
+      tag->type = MULTIBOOT_TAG_TYPE_BASIC_MEMINFO;
+      tag->size = sizeof (struct multiboot_tag_basic_meminfo);
+
+      /* Convert from bytes to kilobytes.  */
+      tag->mem_lower = grub_mmap_get_lower () / 1024;
+      tag->mem_upper = grub_mmap_get_upper () / 1024;
+      ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	/ sizeof (grub_properly_aligned_t);
+    }
+
+  {
+    struct grub_net_network_level_interface *net;
+
+    FOR_NET_NETWORK_LEVEL_INTERFACES(net)
+      if (net->dhcp_ack)
+	{
+	  struct multiboot_tag_network *tag
+	    = (struct multiboot_tag_network *) ptrorig;
+	  tag->type = MULTIBOOT_TAG_TYPE_NETWORK;
+	  tag->size = sizeof (struct multiboot_tag_network) + net->dhcp_acklen;
+	  grub_memcpy (tag->dhcpack, net->dhcp_ack, net->dhcp_acklen);
+	  ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	    / sizeof (grub_properly_aligned_t);
+	}
+  }
+
+  if (bootdev_set)
+    {
+      struct multiboot_tag_bootdev *tag
+	= (struct multiboot_tag_bootdev *) ptrorig;
+      tag->type = MULTIBOOT_TAG_TYPE_BOOTDEV;
+      tag->size = sizeof (struct multiboot_tag_bootdev); 
+
+      tag->biosdev = biosdev;
+      tag->slice = slice;
+      tag->part = part;
+      ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	/ sizeof (grub_properly_aligned_t);
+    }
+
+  {
+    err = retrieve_video_parameters (&ptrorig);
+    if (err)
+      {
+	grub_print_error ();
+	grub_errno = GRUB_ERR_NONE;
+      }
+  }
+
+#if defined (GRUB_MACHINE_EFI) && defined (__x86_64__)
+  {
+    struct multiboot_tag_efi64 *tag = (struct multiboot_tag_efi64 *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_EFI64;
+    tag->size = sizeof (*tag);
+    tag->pointer = (grub_addr_t) grub_efi_system_table;
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+#endif
+
+#if defined (GRUB_MACHINE_EFI) && defined (__i386__)
+  {
+    struct multiboot_tag_efi32 *tag = (struct multiboot_tag_efi32 *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_EFI32;
+    tag->size = sizeof (*tag);
+    tag->pointer = (grub_addr_t) grub_efi_system_table;
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+#endif
+
+#if GRUB_MACHINE_HAS_ACPI
+  {
+    struct multiboot_tag_old_acpi *tag = (struct multiboot_tag_old_acpi *)
+      ptrorig;
+    struct grub_acpi_rsdp_v10 *a = grub_acpi_get_rsdpv1 ();
+    if (a)
+      {
+	tag->type = MULTIBOOT_TAG_TYPE_ACPI_OLD;
+	tag->size = sizeof (*tag) + sizeof (*a);
+	grub_memcpy (tag->rsdp, a, sizeof (*a));
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+  }
+
+  {
+    struct multiboot_tag_new_acpi *tag = (struct multiboot_tag_new_acpi *)
+      ptrorig;
+    struct grub_acpi_rsdp_v20 *a = grub_acpi_get_rsdpv2 ();
+    if (a)
+      {
+	tag->type = MULTIBOOT_TAG_TYPE_ACPI_NEW;
+	tag->size = sizeof (*tag) + a->length;
+	grub_memcpy (tag->rsdp, a, a->length);
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+  }
+#endif
+
+#ifdef GRUB_MACHINE_EFI
+  {
+    struct multiboot_tag_efi_mmap *tag = (struct multiboot_tag_efi_mmap *) ptrorig;
+    grub_efi_uintn_t efi_desc_size;
+    grub_efi_uint32_t efi_desc_version;
+
+    if (!keep_bs)
+      {
+	tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
+	tag->size = sizeof (*tag) + efi_mmap_size;
+
+	err = grub_efi_finish_boot_services (&efi_mmap_size, tag->efi_mmap, NULL,
+					     &efi_desc_size, &efi_desc_version);
+
+	if (err)
+	  return err;
+
+	tag->descr_size = efi_desc_size;
+	tag->descr_vers = efi_desc_version;
+	tag->size = sizeof (*tag) + efi_mmap_size;
+
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+  }
+
+  if (keep_bs)
+    {
+      {
+	struct multiboot_tag *tag = (struct multiboot_tag *) ptrorig;
+	tag->type = MULTIBOOT_TAG_TYPE_EFI_BS;
+	tag->size = sizeof (struct multiboot_tag);
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+
+#ifdef __i386__
+      {
+	struct multiboot_tag_efi32_ih *tag = (struct multiboot_tag_efi32_ih *) ptrorig;
+	tag->type = MULTIBOOT_TAG_TYPE_EFI32_IH;
+	tag->size = sizeof (struct multiboot_tag_efi32_ih);
+	tag->pointer = (grub_addr_t) grub_efi_image_handle;
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+#endif
+
+#ifdef __x86_64__
+      {
+	struct multiboot_tag_efi64_ih *tag = (struct multiboot_tag_efi64_ih *) ptrorig;
+	tag->type = MULTIBOOT_TAG_TYPE_EFI64_IH;
+	tag->size = sizeof (struct multiboot_tag_efi64_ih);
+	tag->pointer = (grub_addr_t) grub_efi_image_handle;
+	ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+	  / sizeof (grub_properly_aligned_t);
+      }
+#endif
+    }
+#endif
+
+  {
+    struct multiboot_tag *tag = (struct multiboot_tag *) ptrorig;
+    tag->type = MULTIBOOT_TAG_TYPE_END;
+    tag->size = sizeof (struct multiboot_tag);
+    ptrorig += ALIGN_UP (tag->size, MULTIBOOT_TAG_ALIGN)
+      / sizeof (grub_properly_aligned_t);
+  }
+
+  ((grub_uint32_t *) mbistart)[0] = (char *) ptrorig - (char *) mbistart;
+  ((grub_uint32_t *) mbistart)[1] = 0;
+
+  return GRUB_ERR_NONE;
+}
+
+void
+grub_multiboot2_free_mbi (void)
+{
+  struct module *cur, *next;
+
+  cmdline_size = 0;
+  total_modcmd = 0;
+  modcnt = 0;
+  grub_free (cmdline);
+  cmdline = NULL;
+  bootdev_set = 0;
+
+  for (cur = modules; cur; cur = next)
+    {
+      next = cur->next;
+      grub_free (cur->cmdline);
+      grub_free (cur);
+    }
+  modules = NULL;
+  modules_last = NULL;
+}
+
+grub_err_t
+grub_multiboot2_init_mbi (int argc, char *argv[])
+{
+  grub_ssize_t len = 0;
+
+  grub_multiboot2_free_mbi ();
+
+  len = grub_loader_cmdline_size (argc, argv);
+
+  cmdline = grub_malloc (len);
+  if (! cmdline)
+    return grub_errno;
+  cmdline_size = len;
+
+  return grub_create_loader_cmdline (argc, argv, cmdline, cmdline_size,
+				     GRUB_VERIFY_KERNEL_CMDLINE);
+}
+
+grub_err_t
+grub_multiboot2_add_module (grub_addr_t start, grub_size_t size,
+			   int argc, char *argv[])
+{
+  struct module *newmod;
+  grub_size_t len = 0;
+  grub_err_t err;
+
+  newmod = grub_malloc (sizeof (*newmod));
+  if (!newmod)
+    return grub_errno;
+  newmod->start = start;
+  newmod->size = size;
+
+  len = grub_loader_cmdline_size (argc, argv);
+
+  newmod->cmdline = grub_malloc (len);
+  if (! newmod->cmdline)
+    {
+      grub_free (newmod);
+      return grub_errno;
+    }
+  newmod->cmdline_size = len;
+  total_modcmd += ALIGN_UP (len, MULTIBOOT_TAG_ALIGN);
+
+  err = grub_create_loader_cmdline (argc, argv, newmod->cmdline,
+				    newmod->cmdline_size, GRUB_VERIFY_MODULE_CMDLINE);
+  if (err)
+    {
+      grub_free (newmod->cmdline);
+      grub_free (newmod);
+      return err;
+    }
+
+  if (modules_last)
+    modules_last->next = newmod;
+  else
+    modules = newmod;
+  modules_last = newmod;
+
+  modcnt++;
+
+  return GRUB_ERR_NONE;
+}
+
+void
+grub_multiboot2_set_bootdev (void)
+{
+  grub_device_t dev;
+
+  slice = ~0;
+  part = ~0;
+
+#ifdef GRUB_MACHINE_PCBIOS
+  biosdev = grub_get_root_biosnumber ();
+#else
+  biosdev = 0xffffffff;
+#endif
+
+  if (biosdev == 0xffffffff)
+    return;
+
+  dev = grub_device_open (0);
+  if (dev && dev->disk && dev->disk->partition)
+    {
+      if (dev->disk->partition->parent)
+ 	{
+	  part = dev->disk->partition->number;
+	  slice = dev->disk->partition->parent->number;
+	}
+      else
+	slice = dev->disk->partition->number;
+    }
+  if (dev)
+    grub_device_close (dev);
+
+  bootdev_set = 1;
+}