/*  init.c -- Initialize GRUB on the newworld mac (PPC).  */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 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/kernel.h>
#include <grub/dl.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/partition.h>
#include <grub/normal.h>
#include <grub/fs.h>
#include <grub/setjmp.h>
#include <grub/env.h>
#include <grub/misc.h>
#include <grub/time.h>
#include <grub/ieee1275/console.h>
#include <grub/ieee1275/ofdisk.h>
#include <grub/ieee1275/ieee1275.h>
#include <grub/net.h>
#include <grub/offsets.h>
#include <grub/memory.h>
#include <grub/loader.h>
#ifdef __i386__
#include <grub/cpu/tsc.h>
#endif
#ifdef __sparc__
#include <grub/machine/kernel.h>
#endif

/* The minimal heap size we can live with. */
#define HEAP_MIN_SIZE		(unsigned long) (2 * 1024 * 1024)

/* The maximum heap size we're going to claim */
#ifdef __i386__
#define HEAP_MAX_SIZE		(unsigned long) (64 * 1024 * 1024)
#else
#define HEAP_MAX_SIZE		(unsigned long) (32 * 1024 * 1024)
#endif

/* If possible, we will avoid claiming heap above this address, because it
   seems to cause relocation problems with OSes that link at 4 MiB */
#ifdef __i386__
#define HEAP_MAX_ADDR		(unsigned long) (64 * 1024 * 1024)
#else
#define HEAP_MAX_ADDR		(unsigned long) (32 * 1024 * 1024)
#endif

extern char _start[];
extern char _end[];

#ifdef __sparc__
grub_addr_t grub_ieee1275_original_stack;
#endif

void
grub_exit (void)
{
  grub_ieee1275_exit ();
}

/* Translate an OF filesystem path (separated by backslashes), into a GRUB
   path (separated by forward slashes).  */
static void
grub_translate_ieee1275_path (char *filepath)
{
  char *backslash;

  backslash = grub_strchr (filepath, '\\');
  while (backslash != 0)
    {
      *backslash = '/';
      backslash = grub_strchr (filepath, '\\');
    }
}

void (*grub_ieee1275_net_config) (const char *dev, char **device, char **path,
                                  char *bootpath);
void
grub_machine_get_bootlocation (char **device, char **path)
{
  char *bootpath;
  char *filename;
  char *type;

  bootpath = grub_ieee1275_get_boot_dev ();
  if (! bootpath)
    return;

  /* Transform an OF device path to a GRUB path.  */

  type = grub_ieee1275_get_device_type (bootpath);
  if (type && grub_strcmp (type, "network") == 0)
    {
      char *dev, *canon;
      char *ptr;
      dev = grub_ieee1275_get_aliasdevname (bootpath);
      canon = grub_ieee1275_canonicalise_devname (dev);
      ptr = canon + grub_strlen (canon) - 1;
      while (ptr > canon && (*ptr == ',' || *ptr == ':'))
	ptr--;
      ptr++;
      *ptr = 0;

      if (grub_ieee1275_net_config)
	grub_ieee1275_net_config (canon, device, path, bootpath);
      grub_free (dev);
      grub_free (canon);
    }
  else
    *device = grub_ieee1275_encode_devname (bootpath);
  grub_free (type);

  filename = grub_ieee1275_get_filename (bootpath);
  if (filename)
    {
      char *lastslash = grub_strrchr (filename, '\\');

      /* Truncate at last directory.  */
      if (lastslash)
        {
	  *lastslash = '\0';
	  grub_translate_ieee1275_path (filename);

	  *path = filename;
	}
    }
  grub_free (bootpath);
}

/* Claim some available memory in the first /memory node. */
#ifdef __sparc__
static void 
grub_claim_heap (void)
{
  grub_mm_init_region ((void *) (grub_modules_get_end ()
				 + GRUB_KERNEL_MACHINE_STACK_SIZE), 0x200000);
}
#else
/* Helper for grub_claim_heap.  */
static int
heap_init (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
	   void *data)
{
  unsigned long *total = data;

  if (type != GRUB_MEMORY_AVAILABLE)
    return 0;

  if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM))
    {
      if (addr + len <= 0x180000)
	return 0;

      if (addr < 0x180000)
	{
	  len = addr + len - 0x180000;
	  addr = 0x180000;
	}
    }
  len -= 1; /* Required for some firmware.  */

  /* Never exceed HEAP_MAX_SIZE  */
  if (*total + len > HEAP_MAX_SIZE)
    len = HEAP_MAX_SIZE - *total;

  /* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
  if ((addr < HEAP_MAX_ADDR) &&				/* if it's too late, don't bother */
      (addr + len > HEAP_MAX_ADDR) &&				/* if it wasn't available anyway, don't bother */
      (*total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE))	/* only limit ourselves when we can afford to */
     len = HEAP_MAX_ADDR - addr;

  /* In theory, firmware should already prevent this from happening by not
     listing our own image in /memory/available.  The check below is intended
     as a safeguard in case that doesn't happen.  However, it doesn't protect
     us from corrupting our module area, which extends up to a
     yet-undetermined region above _end.  */
  if ((addr < (grub_addr_t) _end) && ((addr + len) > (grub_addr_t) _start))
    {
      grub_printf ("Warning: attempt to claim over our own code!\n");
      len = 0;
    }

  if (len)
    {
      grub_err_t err;
      /* Claim and use it.  */
      err = grub_claimmap (addr, len);
      if (err)
	return err;
      grub_mm_init_region ((void *) (grub_addr_t) addr, len);
    }

  *total += len;
  if (*total >= HEAP_MAX_SIZE)
    return 1;

  return 0;
}

static void 
grub_claim_heap (void)
{
  unsigned long total = 0;

  if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM))
    heap_init (GRUB_IEEE1275_STATIC_HEAP_START, GRUB_IEEE1275_STATIC_HEAP_LEN,
	       1, &total);
  else
    grub_machine_mmap_iterate (heap_init, &total);
}
#endif

static void
grub_parse_cmdline (void)
{
  grub_ssize_t actual;
  char args[256];

  if (grub_ieee1275_get_property (grub_ieee1275_chosen, "bootargs", &args,
				  sizeof args, &actual) == 0
      && actual > 1)
    {
      int i = 0;

      while (i < actual)
	{
	  char *command = &args[i];
	  char *end;
	  char *val;

	  end = grub_strchr (command, ';');
	  if (end == 0)
	    i = actual; /* No more commands after this one.  */
	  else
	    {
	      *end = '\0';
	      i += end - command + 1;
	      while (grub_isspace(args[i]))
		i++;
	    }

	  /* Process command.  */
	  val = grub_strchr (command, '=');
	  if (val)
	    {
	      *val = '\0';
	      grub_env_set (command, val + 1);
	    }
	}
    }
}

grub_addr_t grub_modbase;

void
grub_machine_init (void)
{
  grub_modbase = ALIGN_UP((grub_addr_t) _end 
			  + GRUB_KERNEL_MACHINE_MOD_GAP,
			  GRUB_KERNEL_MACHINE_MOD_ALIGN);
  grub_ieee1275_init ();

  grub_console_init_early ();
  grub_claim_heap ();
  grub_console_init_lately ();
  grub_ofdisk_init ();

  grub_parse_cmdline ();

#ifdef __i386__
  grub_tsc_init ();
#else
  grub_install_get_time_ms (grub_rtc_get_time_ms);
#endif
}

void
grub_machine_fini (int flags)
{
  if (flags & GRUB_LOADER_FLAG_NORETURN)
    {
      grub_ofdisk_fini ();
      grub_console_fini ();
    }
}

grub_uint64_t
grub_rtc_get_time_ms (void)
{
  grub_uint32_t msecs = 0;

  grub_ieee1275_milliseconds (&msecs);

  return msecs;
}