/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009  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/machine/memory.h>
#include <grub/memory.h>
#ifdef GRUB_MACHINE_PCBIOS
#include <grub/machine/biosnum.h>
#endif
#include <grub/multiboot.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/file.h>

/* The bits in the required part of flags field we don't support.  */
#define UNSUPPORTED_FLAGS			0x0000fff8

struct module
{
  struct module *next;
  grub_addr_t start;
  grub_size_t size;
  char *cmdline;
  int cmdline_size;
};

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 grub_uint32_t bootdev;
static int bootdev_set;

grub_err_t
grub_multiboot_load (grub_file_t file)
{
  char *buffer;
  grub_ssize_t len;
  struct multiboot_header *header;
  grub_err_t err;

  buffer = grub_malloc (MULTIBOOT_SEARCH);
  if (!buffer)
    return grub_errno;

  len = grub_file_read (file, buffer, MULTIBOOT_SEARCH);
  if (len < 32)
    {
      grub_free (buffer);
      return grub_error (GRUB_ERR_BAD_OS, "file too small");
    }

  /* 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 <= buffer + len - 12) || (header = 0);
       header = (struct multiboot_header *) ((char *) header + MULTIBOOT_HEADER_ALIGN))
    {
      if (header->magic == MULTIBOOT_HEADER_MAGIC
	  && !(header->magic + header->flags + header->checksum))
	break;
    }

  if (header == 0)
    {
      grub_free (buffer);
      return grub_error (GRUB_ERR_BAD_ARGUMENT, "no multiboot header found");
    }

  if (header->flags & UNSUPPORTED_FLAGS)
    {
      grub_free (buffer);
      return grub_error (GRUB_ERR_UNKNOWN_OS,
			 "unsupported flag: 0x%x", header->flags);
    }

  if (header->flags & MULTIBOOT_AOUT_KLUDGE)
    {
      int offset = ((char *) header - buffer -
		    (header->header_addr - header->load_addr));
      int load_size = ((header->load_end_addr == 0) ? file->size - offset :
		       header->load_end_addr - header->load_addr);
      grub_size_t code_size;

      if (header->bss_end_addr)
	code_size = (header->bss_end_addr - header->load_addr);
      else
	code_size = load_size;
      grub_multiboot_payload_dest = header->load_addr;

      grub_multiboot_pure_size += code_size;

      /* Allocate a bit more to avoid relocations in most cases.  */
      grub_multiboot_alloc_mbi = grub_multiboot_get_mbi_size () + 65536;
      grub_multiboot_payload_orig
	= grub_relocator32_alloc (grub_multiboot_pure_size + grub_multiboot_alloc_mbi);

      if (! grub_multiboot_payload_orig)
	{
	  grub_free (buffer);
	  return grub_errno;
	}

      if ((grub_file_seek (file, offset)) == (grub_off_t) -1)
	{
	  grub_free (buffer);
	  return grub_errno;
	}

      grub_file_read (file, (void *) grub_multiboot_payload_orig, load_size);
      if (grub_errno)
	{
	  grub_free (buffer);
	  return grub_errno;
	}

      if (header->bss_end_addr)
	grub_memset ((void *) (grub_multiboot_payload_orig + load_size), 0,
		     header->bss_end_addr - header->load_addr - load_size);

      grub_multiboot_payload_eip = header->entry_addr;

    }
  else
    {
      err = grub_multiboot_load_elf (file, buffer);
      if (err)
	{
	  grub_free (buffer);
	  return err;
	}
    }

  if (header->flags & MULTIBOOT_VIDEO_MODE)
    {
      switch (header->mode_type)
	{
	case 1:
	  err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT, 
					    GRUB_MULTIBOOT_CONSOLE_EGA_TEXT
					    | GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
					    0, 0, 0, 0);
	  break;
	case 0:
	  err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
					    GRUB_MULTIBOOT_CONSOLE_EGA_TEXT
					    | GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER,
					    header->width, header->height,
					    header->depth, 0);
	  break;
	default:
	  err = grub_error (GRUB_ERR_BAD_OS, 
			    "unsupported graphical mode type %d",
			    header->mode_type);
	  break;
	}
    }
  else
    err = grub_multiboot_set_console (GRUB_MULTIBOOT_CONSOLE_EGA_TEXT, 
				      GRUB_MULTIBOOT_CONSOLE_EGA_TEXT,
				      0, 0, 0, 0);
  return err;
}

grub_size_t
grub_multiboot_get_mbi_size (void)
{
  return sizeof (struct multiboot_info) + ALIGN_UP (cmdline_size, 4)
    + modcnt * sizeof (struct multiboot_mod_list) + total_modcmd
    + ALIGN_UP (sizeof(PACKAGE_STRING), 4) 
    + grub_get_multiboot_mmap_count () * sizeof (struct multiboot_mmap_entry)
    + 256 * sizeof (struct multiboot_color);
}

/* Fill previously allocated Multiboot mmap.  */
static void
grub_fill_multiboot_mmap (struct multiboot_mmap_entry *first_entry)
{
  struct multiboot_mmap_entry *mmap_entry = (struct multiboot_mmap_entry *) first_entry;

  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)
    {
      mmap_entry->addr = addr;
      mmap_entry->len = size;
      switch (type)
	{
	case GRUB_MACHINE_MEMORY_AVAILABLE:
 	  mmap_entry->type = MULTIBOOT_MEMORY_AVAILABLE;
 	  break;

#ifdef GRUB_MACHINE_MEMORY_ACPI_RECLAIMABLE
	case GRUB_MACHINE_MEMORY_ACPI_RECLAIMABLE:
 	  mmap_entry->type = MULTIBOOT_MEMORY_ACPI_RECLAIMABLE;
 	  break;
#endif

#ifdef GRUB_MACHINE_MEMORY_NVS
	case GRUB_MACHINE_MEMORY_NVS:
 	  mmap_entry->type = MULTIBOOT_MEMORY_NVS;
 	  break;
#endif	  
	  
 	default:
 	  mmap_entry->type = MULTIBOOT_MEMORY_RESERVED;
 	  break;
 	}
      mmap_entry->size = sizeof (struct multiboot_mmap_entry) - sizeof (mmap_entry->size);
      mmap_entry++;

      return 0;
    }

  grub_mmap_iterate (hook);
}

static grub_err_t
retrieve_video_parameters (struct multiboot_info *mbi,
			   grub_uint8_t *ptrorig, grub_uint32_t ptrdest)
{
  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];

  err = grub_multiboot_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 (driv_id == GRUB_VIDEO_DRIVER_NONE)
    return GRUB_ERR_NONE;

  err = grub_video_get_info_and_fini (&mode_info, &framebuffer);
  if (err)
    return err;

  mbi->framebuffer_addr = (grub_addr_t) framebuffer;
  mbi->framebuffer_pitch = mode_info.pitch;

  mbi->framebuffer_width = mode_info.width;
  mbi->framebuffer_height = mode_info.height;

  mbi->framebuffer_bpp = mode_info.bpp;
      
  if (mode_info.mode_type & GRUB_VIDEO_MODE_TYPE_INDEX_COLOR)
    {
      struct multiboot_color *mb_palette;
      unsigned i;
      mbi->framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED;
      mbi->framebuffer_palette_addr = ptrdest;
      mbi->framebuffer_palette_num_colors = mode_info.number_of_colors;
      if (mbi->framebuffer_palette_num_colors > ARRAY_SIZE (palette))
	mbi->framebuffer_palette_num_colors = ARRAY_SIZE (palette);
      mb_palette = (struct multiboot_color *) ptrorig;
      for (i = 0; i < mbi->framebuffer_palette_num_colors; i++)
	{
	  mb_palette[i].red = palette[i].r;
	  mb_palette[i].green = palette[i].g;
	  mb_palette[i].blue = palette[i].b;
	}
      ptrorig += mbi->framebuffer_palette_num_colors
	* sizeof (struct multiboot_color);
      ptrdest += mbi->framebuffer_palette_num_colors
	* sizeof (struct multiboot_color);
    }
  else
    {
      mbi->framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB;
      mbi->framebuffer_red_field_position = mode_info.green_field_pos;
      mbi->framebuffer_red_mask_size = mode_info.green_mask_size;
      mbi->framebuffer_green_field_position = mode_info.green_field_pos;
      mbi->framebuffer_green_mask_size = mode_info.green_mask_size;
      mbi->framebuffer_blue_field_position = mode_info.blue_field_pos;
      mbi->framebuffer_blue_mask_size = mode_info.blue_mask_size;
    }

  mbi->flags |= MULTIBOOT_INFO_FRAMEBUFFER_INFO;

  return GRUB_ERR_NONE;
}

grub_err_t
grub_multiboot_make_mbi (void *orig, grub_uint32_t dest, grub_off_t buf_off,
			 grub_size_t bufsize)
{
  grub_uint8_t *ptrorig = (grub_uint8_t *) orig + buf_off;
  grub_uint32_t ptrdest = dest + buf_off;
  struct multiboot_info *mbi;
  struct multiboot_mod_list *modlist;
  unsigned i;
  struct module *cur;
  grub_size_t mmap_size;
  grub_err_t err;

  if (bufsize < grub_multiboot_get_mbi_size ())
    return grub_error (GRUB_ERR_OUT_OF_MEMORY, "mbi buffer is too small");

  mbi = (struct multiboot_info *) ptrorig;
  ptrorig += sizeof (*mbi);
  ptrdest += sizeof (*mbi);
  grub_memset (mbi, 0, sizeof (*mbi));

  grub_memcpy (ptrorig, cmdline, cmdline_size);
  mbi->flags |= MULTIBOOT_INFO_CMDLINE;
  mbi->cmdline = ptrdest;
  ptrorig += ALIGN_UP (cmdline_size, 4);
  ptrdest += ALIGN_UP (cmdline_size, 4);

  grub_memcpy (ptrorig, PACKAGE_STRING, sizeof(PACKAGE_STRING));
  mbi->flags |= MULTIBOOT_INFO_BOOT_LOADER_NAME;
  mbi->boot_loader_name = ptrdest;
  ptrorig += ALIGN_UP (sizeof(PACKAGE_STRING), 4);
  ptrdest += ALIGN_UP (sizeof(PACKAGE_STRING), 4);

  if (modcnt)
    {
      mbi->flags |= MULTIBOOT_INFO_MODS;
      mbi->mods_addr = ptrdest;
      mbi->mods_count = modcnt;
      modlist = (struct multiboot_mod_list *) ptrorig;
      ptrorig += modcnt * sizeof (struct multiboot_mod_list);
      ptrdest += modcnt * sizeof (struct multiboot_mod_list);

      for (i = 0, cur = modules; i < modcnt; i++, cur = cur->next)
	{
	  modlist[i].mod_start = cur->start;
	  modlist[i].mod_end = modlist[i].mod_start + cur->size;
	  modlist[i].cmdline = ptrdest;
	  grub_memcpy (ptrorig, cur->cmdline, cur->cmdline_size);
	  ptrorig += ALIGN_UP (cur->cmdline_size, 4);
	  ptrdest += ALIGN_UP (cur->cmdline_size, 4);
	}
    }
  else
    {
      mbi->mods_addr = 0;
      mbi->mods_count = 0;
    }

  mmap_size = grub_get_multiboot_mmap_count () 
    * sizeof (struct multiboot_mmap_entry);
  grub_fill_multiboot_mmap ((struct multiboot_mmap_entry *) ptrorig);
  mbi->mmap_length = mmap_size;
  mbi->mmap_addr = ptrdest;
  mbi->flags |= MULTIBOOT_INFO_MEM_MAP;
  ptrorig += mmap_size;
  ptrdest += mmap_size;

  /* Convert from bytes to kilobytes.  */
  mbi->mem_lower = grub_mmap_get_lower () / 1024;
  mbi->mem_upper = grub_mmap_get_upper () / 1024;
  mbi->flags |= MULTIBOOT_INFO_MEMORY;

  if (bootdev_set)
    {
      mbi->boot_device = bootdev;
      mbi->flags |= MULTIBOOT_INFO_BOOTDEV;
    }

  err = retrieve_video_parameters (mbi, ptrorig, ptrdest);
  if (err)
    {
      grub_print_error ();
      grub_errno = GRUB_ERR_NONE;
    }

  return GRUB_ERR_NONE;
}

void
grub_multiboot_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_multiboot_init_mbi (int argc, char *argv[])
{
  grub_ssize_t len = 0;
  char *p;
  int i;

  grub_multiboot_free_mbi ();

  for (i = 0; i < argc; i++)
    len += grub_strlen (argv[i]) + 1;
  if (len == 0)
    len = 1;

  cmdline = p = grub_malloc (len);
  if (! cmdline)
    return grub_errno;
  cmdline_size = len;

  for (i = 0; i < argc; i++)
    {
      p = grub_stpcpy (p, argv[i]);
      *(p++) = ' ';
    }

  /* Remove the space after the last word.  */
  if (p != cmdline)
    p--;
  *p = '\0';

  return GRUB_ERR_NONE;
}

grub_err_t
grub_multiboot_add_module (grub_addr_t start, grub_size_t size,
			   int argc, char *argv[])
{
  struct module *newmod;
  char *p;
  grub_ssize_t len = 0;
  int i;

  newmod = grub_malloc (sizeof (*newmod));
  if (!newmod)
    return grub_errno;
  newmod->start = start;
  newmod->size = size;

  for (i = 0; i < argc; i++)
    len += grub_strlen (argv[i]) + 1;

  if (len == 0)
    len = 1;

  newmod->cmdline = p = grub_malloc (len);
  if (! newmod->cmdline)
    {
      grub_free (newmod);
      return grub_errno;
    }
  newmod->cmdline_size = len;
  total_modcmd += ALIGN_UP (len, 4);

  for (i = 0; i < argc; i++)
    {
      p = grub_stpcpy (p, argv[i]);
      *(p++) = ' ';
    }

  /* Remove the space after the last word.  */
  if (p != newmod->cmdline)
    p--;
  *p = '\0';

  if (modules_last)
    modules_last->next = newmod;
  else
    {
      modules = newmod;
      modules_last->next = NULL;
    }
  modules_last = newmod;

  modcnt++;

  return GRUB_ERR_NONE;
}

void
grub_multiboot_set_bootdev (void)
{
  grub_uint32_t biosdev, slice = ~0, part = ~0;
  grub_device_t dev;

#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 = ((biosdev & 0xff) << 24) | ((slice & 0xff) << 16) 
    | ((part & 0xff) << 8) | 0xff;
  bootdev_set = 1;
}