/* multiboot.c - boot a multiboot OS image. */
/*
 *  VAS_EBOOT  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010  Free Software Foundation, Inc.
 *
 *  VAS_EBOOT 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.
 *
 *  VAS_EBOOT 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 VAS_EBOOT.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 *  FIXME: The following features from the Multiboot specification still
 *         need to be implemented:
 *  - drives table
 *  - ROM configuration table
 *  - SMBIOS tables
 *  - Networking information
 */

#include <VasEBoot/loader.h>
#include <VasEBoot/command.h>
#ifdef VAS_EBOOT_USE_MULTIBOOT2
#include <VasEBoot/multiboot2.h>
#define VAS_EBOOT_MULTIBOOT_CONSOLE_FRAMEBUFFER VAS_EBOOT_MULTIBOOT2_CONSOLE_FRAMEBUFFER
#define VAS_EBOOT_MULTIBOOT_CONSOLE_EGA_TEXT VAS_EBOOT_MULTIBOOT2_CONSOLE_EGA_TEXT
#define VAS_EBOOT_MULTIBOOT(x) VasEBoot_multiboot2_ ## x
#else
#include <VasEBoot/multiboot.h>
#define VAS_EBOOT_MULTIBOOT(x) VasEBoot_multiboot_ ## x
#endif
#include <VasEBoot/cpu/multiboot.h>
#include <VasEBoot/elf.h>
#include <VasEBoot/aout.h>
#include <VasEBoot/file.h>
#include <VasEBoot/err.h>
#include <VasEBoot/dl.h>
#include <VasEBoot/mm.h>
#include <VasEBoot/misc.h>
#include <VasEBoot/env.h>
#include <VasEBoot/cpu/relocator.h>
#include <VasEBoot/video.h>
#include <VasEBoot/memory.h>
#include <VasEBoot/i18n.h>

VAS_EBOOT_MOD_LICENSE ("GPLv3+");

#ifdef VAS_EBOOT_MACHINE_EFI
#include <VasEBoot/efi/efi.h>
#endif

struct VasEBoot_relocator *VAS_EBOOT_MULTIBOOT (relocator) = NULL;
VasEBoot_uint32_t VAS_EBOOT_MULTIBOOT (payload_eip);
#if defined (VAS_EBOOT_MACHINE_PCBIOS) || defined (VAS_EBOOT_MACHINE_MULTIBOOT) || defined (VAS_EBOOT_MACHINE_COREBOOT) || defined (VAS_EBOOT_MACHINE_QEMU)
#define DEFAULT_VIDEO_MODE "text"
#else
#define DEFAULT_VIDEO_MODE "auto"
#endif

static int accepts_video;
static int accepts_ega_text;
static int console_required;
static VasEBoot_dl_t my_mod;


/* Helper for VasEBoot_get_multiboot_mmap_count.  */
static int
count_hook (VasEBoot_uint64_t addr __attribute__ ((unused)),
	    VasEBoot_uint64_t size __attribute__ ((unused)),
	    VasEBoot_memory_type_t type __attribute__ ((unused)), void *data)
{
  VasEBoot_size_t *count = data;

  (*count)++;
  return 0;
}

/* Return the length of the Multiboot mmap that will be needed to allocate
   our platform's map.  */
VasEBoot_uint32_t
VAS_EBOOT_MULTIBOOT (get_mmap_count) (void)
{
  VasEBoot_size_t count = 0;

  VasEBoot_mmap_iterate (count_hook, &count);

  return count;
}

VasEBoot_err_t
VAS_EBOOT_MULTIBOOT (set_video_mode) (void)
{
  VasEBoot_err_t err;
  const char *modevar;

#if VAS_EBOOT_MACHINE_HAS_VGA_TEXT
  if (accepts_video)
#endif
    {
      modevar = VasEBoot_env_get ("gfxpayload");
      if (! modevar || *modevar == 0)
	err = VasEBoot_video_set_mode (DEFAULT_VIDEO_MODE, 0, 0);
      else
	{
	  char *tmp;
	  tmp = VasEBoot_xasprintf ("%s;" DEFAULT_VIDEO_MODE, modevar);
	  if (! tmp)
	    return VasEBoot_errno;
	  err = VasEBoot_video_set_mode (tmp, 0, 0);
	  VasEBoot_free (tmp);
	}
    }
#if VAS_EBOOT_MACHINE_HAS_VGA_TEXT
  else
    err = VasEBoot_video_set_mode ("text", 0, 0);
#endif

  return err;
}

#ifdef VAS_EBOOT_MACHINE_EFI
#ifdef __x86_64__
#define VasEBoot_relocator_efi_boot		VasEBoot_relocator64_efi_boot
#define VasEBoot_relocator_efi_state	VasEBoot_relocator64_efi_state
#endif
#endif

#ifdef VasEBoot_relocator_efi_boot
static void
efi_boot (struct VasEBoot_relocator *rel,
	  VasEBoot_uint32_t target)
{
#ifdef VAS_EBOOT_USE_MULTIBOOT2
  struct VasEBoot_relocator_efi_state state_efi = MULTIBOOT2_EFI_INITIAL_STATE;
#else
  struct VasEBoot_relocator_efi_state state_efi = MULTIBOOT_EFI_INITIAL_STATE;
#endif
  state_efi.MULTIBOOT_EFI_ENTRY_REGISTER = VAS_EBOOT_MULTIBOOT (payload_eip);
  state_efi.MULTIBOOT_EFI_MBI_REGISTER = target;

  VasEBoot_relocator_efi_boot (rel, state_efi);
}
#else
#define VasEBoot_efi_is_finished	1
static void
efi_boot (struct VasEBoot_relocator *rel __attribute__ ((unused)),
	  VasEBoot_uint32_t target __attribute__ ((unused)))
{
}
#endif

#if defined (__i386__) || defined (__x86_64__)
static void
normal_boot (struct VasEBoot_relocator *rel, struct VasEBoot_relocator32_state state)
{
  VasEBoot_relocator32_boot (rel, state, 0);
}
#else
static void
normal_boot (struct VasEBoot_relocator *rel, struct VasEBoot_relocator32_state state)
{
  VasEBoot_relocator32_boot (rel, state);
}
#endif

static VasEBoot_err_t
VasEBoot_multiboot_boot (void)
{
  VasEBoot_err_t err;

#ifdef VAS_EBOOT_USE_MULTIBOOT2
  struct VasEBoot_relocator32_state state = MULTIBOOT2_INITIAL_STATE;
#else
  struct VasEBoot_relocator32_state state = MULTIBOOT_INITIAL_STATE;
#endif
  state.MULTIBOOT_ENTRY_REGISTER = VAS_EBOOT_MULTIBOOT (payload_eip);

  err = VAS_EBOOT_MULTIBOOT (make_mbi) (&state.MULTIBOOT_MBI_REGISTER);

  if (err)
    return err;

  if (VasEBoot_efi_is_finished)
    normal_boot (VAS_EBOOT_MULTIBOOT (relocator), state);
  else
    efi_boot (VAS_EBOOT_MULTIBOOT (relocator), state.MULTIBOOT_MBI_REGISTER);

  /* Not reached.  */
  return VAS_EBOOT_ERR_NONE;
}

static VasEBoot_err_t
VasEBoot_multiboot_unload (void)
{
  VAS_EBOOT_MULTIBOOT (free_mbi) ();

  VasEBoot_relocator_unload (VAS_EBOOT_MULTIBOOT (relocator));
  VAS_EBOOT_MULTIBOOT (relocator) = NULL;

  VasEBoot_dl_unref (my_mod);

  return VAS_EBOOT_ERR_NONE;
}

static VasEBoot_uint64_t highest_load;

#define MULTIBOOT_LOAD_ELF64
#include "multiboot_elfxx.c"
#undef MULTIBOOT_LOAD_ELF64

#define MULTIBOOT_LOAD_ELF32
#include "multiboot_elfxx.c"
#undef MULTIBOOT_LOAD_ELF32

/* Load ELF32 or ELF64.  */
VasEBoot_err_t
VAS_EBOOT_MULTIBOOT (load_elf) (mbi_load_data_t *mld)
{
  if (VasEBoot_multiboot_is_elf32 (mld->buffer))
    return VasEBoot_multiboot_load_elf32 (mld);
  else if (VasEBoot_multiboot_is_elf64 (mld->buffer))
    return VasEBoot_multiboot_load_elf64 (mld);

  return VasEBoot_error (VAS_EBOOT_ERR_UNKNOWN_OS, N_("invalid arch-dependent ELF magic"));
}

VasEBoot_err_t
VAS_EBOOT_MULTIBOOT (set_console) (int console_type, int accepted_consoles,
			      int width, int height, int depth,
			      int console_req)
{
  console_required = console_req;
  if (!(accepted_consoles
	& (VAS_EBOOT_MULTIBOOT_CONSOLE_FRAMEBUFFER
	   | (VAS_EBOOT_MACHINE_HAS_VGA_TEXT ? VAS_EBOOT_MULTIBOOT_CONSOLE_EGA_TEXT : 0))))
    {
      if (console_required)
	return VasEBoot_error (VAS_EBOOT_ERR_BAD_OS,
			   "OS requires a console but none is available");
      VasEBoot_puts_ (N_("WARNING: no console will be available to OS"));
      accepts_video = 0;
      accepts_ega_text = 0;
      return VAS_EBOOT_ERR_NONE;
    }

  if (console_type == VAS_EBOOT_MULTIBOOT_CONSOLE_FRAMEBUFFER)
    {
      char *buf;
      if (depth && width && height)
	buf = VasEBoot_xasprintf ("%dx%dx%d,%dx%d,auto", width,
			      height, depth, width, height);
      else if (width && height)
	buf = VasEBoot_xasprintf ("%dx%d,auto", width, height);
      else
	buf = VasEBoot_strdup ("auto");

      if (!buf)
	return VasEBoot_errno;
      VasEBoot_env_set ("gfxpayload", buf);
      VasEBoot_free (buf);
    }
  else
    {
#if VAS_EBOOT_MACHINE_HAS_VGA_TEXT
      VasEBoot_env_set ("gfxpayload", "text");
#else
      /* Always use video if no VGA text is available.  */
      VasEBoot_env_set ("gfxpayload", "auto");
#endif
    }

  accepts_video = !!(accepted_consoles & VAS_EBOOT_MULTIBOOT_CONSOLE_FRAMEBUFFER);
  accepts_ega_text = !!(accepted_consoles & VAS_EBOOT_MULTIBOOT_CONSOLE_EGA_TEXT);
  return VAS_EBOOT_ERR_NONE;
}

static VasEBoot_err_t
VasEBoot_cmd_multiboot (VasEBoot_command_t cmd __attribute__ ((unused)),
		    int argc, char *argv[])
{
  VasEBoot_file_t file = 0;
  VasEBoot_err_t err;

  VasEBoot_loader_unset ();

  highest_load = 0;

#ifndef VAS_EBOOT_USE_MULTIBOOT2
  VasEBoot_multiboot_quirks = VAS_EBOOT_MULTIBOOT_QUIRKS_NONE;
  int option_found = 0;

  do
    {
      option_found = 0;
      if (argc != 0 && VasEBoot_strcmp (argv[0], "--quirk-bad-kludge") == 0)
	{
	  argc--;
	  argv++;
	  option_found = 1;
	  VasEBoot_multiboot_quirks |= VAS_EBOOT_MULTIBOOT_QUIRK_BAD_KLUDGE;
	}

      if (argc != 0 && VasEBoot_strcmp (argv[0], "--quirk-modules-after-kernel") == 0)
	{
	  argc--;
	  argv++;
	  option_found = 1;
	  VasEBoot_multiboot_quirks |= VAS_EBOOT_MULTIBOOT_QUIRK_MODULES_AFTER_KERNEL;
	}
    } while (option_found);
#endif

  if (argc == 0)
    return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("filename expected"));

  file = VasEBoot_file_open (argv[0], VAS_EBOOT_FILE_TYPE_MULTIBOOT_KERNEL);
  if (! file)
    return VasEBoot_errno;

  VasEBoot_dl_ref (my_mod);

  /* Skip filename.  */
  VAS_EBOOT_MULTIBOOT (init_mbi) (argc - 1, argv + 1);

  VasEBoot_relocator_unload (VAS_EBOOT_MULTIBOOT (relocator));
  VAS_EBOOT_MULTIBOOT (relocator) = VasEBoot_relocator_new ();

  if (!VAS_EBOOT_MULTIBOOT (relocator))
    goto fail;

  err = VAS_EBOOT_MULTIBOOT (load) (file, argv[0]);
  if (err)
    goto fail;

  VAS_EBOOT_MULTIBOOT (set_bootdev) ();

  VasEBoot_loader_set (VasEBoot_multiboot_boot, VasEBoot_multiboot_unload, 0);

 fail:
  if (file)
    VasEBoot_file_close (file);

  if (VasEBoot_errno != VAS_EBOOT_ERR_NONE)
    {
      VasEBoot_relocator_unload (VAS_EBOOT_MULTIBOOT (relocator));
      VAS_EBOOT_MULTIBOOT (relocator) = NULL;
      VasEBoot_dl_unref (my_mod);
    }

  return VasEBoot_errno;
}

static VasEBoot_err_t
VasEBoot_cmd_module (VasEBoot_command_t cmd __attribute__ ((unused)),
		 int argc, char *argv[])
{
  VasEBoot_file_t file = 0;
  VasEBoot_ssize_t size;
  void *module = NULL;
  VasEBoot_addr_t target;
  VasEBoot_err_t err;
  int nounzip = 0;
  VasEBoot_uint64_t lowest_addr = 0;

  if (argc == 0)
    return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("filename expected"));

  if (VasEBoot_strcmp (argv[0], "--nounzip") == 0)
    {
      argv++;
      argc--;
      nounzip = 1;
    }

  if (argc == 0)
    return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("filename expected"));

  if (!VAS_EBOOT_MULTIBOOT (relocator))
    return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT,
		       N_("you need to load the kernel first"));

  file = VasEBoot_file_open (argv[0], VAS_EBOOT_FILE_TYPE_MULTIBOOT_MODULE
			 | (nounzip ? VAS_EBOOT_FILE_TYPE_NO_DECOMPRESS : VAS_EBOOT_FILE_TYPE_NONE));
  if (! file)
    return VasEBoot_errno;

#ifndef VAS_EBOOT_USE_MULTIBOOT2
  lowest_addr = 0x100000;
  if (VasEBoot_multiboot_quirks & VAS_EBOOT_MULTIBOOT_QUIRK_MODULES_AFTER_KERNEL)
    lowest_addr = ALIGN_UP (highest_load + 1048576, 4096);
#endif

  size = VasEBoot_file_size (file);
  if (size)
  {
    VasEBoot_relocator_chunk_t ch;
    err = VasEBoot_relocator_alloc_chunk_align (VAS_EBOOT_MULTIBOOT (relocator), &ch,
					    lowest_addr, UP_TO_TOP32 (size),
					    size, MULTIBOOT_MOD_ALIGN,
					    VAS_EBOOT_RELOCATOR_PREFERENCE_NONE, 1);
    if (err)
      {
	VasEBoot_file_close (file);
	return err;
      }
    module = get_virtual_current_address (ch);
    target = get_physical_target_address (ch);
  }
  else
    {
      module = 0;
      target = 0;
    }

  if (size && VasEBoot_file_read (file, module, size) != size)
    {
      VasEBoot_file_close (file);
      if (!VasEBoot_errno)
	VasEBoot_error (VAS_EBOOT_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
		    argv[0]);
      return VasEBoot_errno;
    }

  VasEBoot_file_close (file);

  return VAS_EBOOT_MULTIBOOT (add_module) (target, size, argc - 1, argv + 1);
}

static VasEBoot_command_t cmd_multiboot, cmd_module;

VAS_EBOOT_MOD_INIT(multiboot)
{
  cmd_multiboot =
#ifdef VAS_EBOOT_USE_MULTIBOOT2
    VasEBoot_register_command ("multiboot2", VasEBoot_cmd_multiboot,
			   0, N_("Load a multiboot 2 kernel."));
  cmd_module =
    VasEBoot_register_command ("module2", VasEBoot_cmd_module,
			   0, N_("Load a multiboot 2 module."));
#else
    VasEBoot_register_command ("multiboot", VasEBoot_cmd_multiboot,
			   0, N_("Load a multiboot kernel."));
  cmd_module =
    VasEBoot_register_command ("module", VasEBoot_cmd_module,
			   0, N_("Load a multiboot module."));
#endif

  my_mod = mod;
}

VAS_EBOOT_MOD_FINI(multiboot)
{
  VasEBoot_unregister_command (cmd_multiboot);
  VasEBoot_unregister_command (cmd_module);
}