Adding upstream version 2.06.upstream/2.06upstream

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

4 files changed, 764 insertions, 0 deletions

diff --git a/grub-core/kern/i386/pc/acpi.c b/grub-core/kern/i386/pc/acpi.c
new file mode 100644
index 0000000..297f5d0
--- /dev/null
+++ b/grub-core/kern/i386/pc/acpi.c
@@ -0,0 +1,83 @@
+/* acpi.c - get acpi tables. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 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/acpi.h>
+#include <grub/misc.h>
+
+struct grub_acpi_rsdp_v10 *
+grub_machine_acpi_get_rsdpv1 (void)
+{
+  int ebda_len;
+  grub_uint8_t *ebda, *ptr;
+
+  grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
+  ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+  ebda_len = * (grub_uint16_t *) ebda;
+  if (! ebda_len) /* FIXME do we really need this check? */
+    goto scan_bios;
+  for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
+    if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+	&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+	&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
+      return (struct grub_acpi_rsdp_v10 *) ptr;
+
+scan_bios:
+  grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+  for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
+       ptr += 16)
+    if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+	&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+	&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
+      return (struct grub_acpi_rsdp_v10 *) ptr;
+  return 0;
+}
+
+struct grub_acpi_rsdp_v20 *
+grub_machine_acpi_get_rsdpv2 (void)
+{
+  int ebda_len;
+  grub_uint8_t *ebda, *ptr;
+
+  grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
+  ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+  ebda_len = * (grub_uint16_t *) ebda;
+  if (! ebda_len) /* FIXME do we really need this check? */
+    goto scan_bios;
+  for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
+    if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+	&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+	&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
+	&& ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
+	&& grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
+	== 0)
+      return (struct grub_acpi_rsdp_v20 *) ptr;
+
+scan_bios:
+  grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+  for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
+       ptr += 16)
+    if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
+	&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
+	&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
+	&& ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
+	&& grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
+	== 0)
+      return (struct grub_acpi_rsdp_v20 *) ptr;
+  return 0;
+}
diff --git a/grub-core/kern/i386/pc/init.c b/grub-core/kern/i386/pc/init.c
new file mode 100644
index 0000000..27bc68b
--- /dev/null
+++ b/grub-core/kern/i386/pc/init.c
@@ -0,0 +1,271 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010  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/mm.h>
+#include <grub/machine/boot.h>
+#include <grub/i386/floppy.h>
+#include <grub/machine/memory.h>
+#include <grub/machine/console.h>
+#include <grub/machine/kernel.h>
+#include <grub/machine/int.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/loader.h>
+#include <grub/env.h>
+#include <grub/cache.h>
+#include <grub/time.h>
+#include <grub/cpu/cpuid.h>
+#include <grub/cpu/tsc.h>
+#include <grub/machine/time.h>
+
+struct mem_region
+{
+  grub_addr_t addr;
+  grub_size_t size;
+};
+
+#define MAX_REGIONS	32
+
+static struct mem_region mem_regions[MAX_REGIONS];
+static int num_regions;
+
+void (*grub_pc_net_config) (char **device, char **path);
+
+/*
+ *	return the real time in ticks, of which there are about
+ *	18-20 per second
+ */
+grub_uint64_t
+grub_rtc_get_time_ms (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.eax = 0;
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+  grub_bios_interrupt (0x1a, &regs);
+
+  return ((regs.ecx << 16) | (regs.edx & 0xffff)) * 55ULL;
+}
+
+void
+grub_machine_get_bootlocation (char **device, char **path)
+{
+  char *ptr;
+  grub_uint8_t boot_drive, dos_part, bsd_part;
+
+  boot_drive = (grub_boot_device >> 24);
+  dos_part = (grub_boot_device >> 16);
+  bsd_part = (grub_boot_device >> 8);
+
+  /* No hardcoded root partition - make it from the boot drive and the
+     partition number encoded at the install time.  */
+  if (boot_drive == GRUB_BOOT_MACHINE_PXE_DL)
+    {
+      if (grub_pc_net_config)
+	grub_pc_net_config (device, path);
+      return;
+    }
+
+  /* XXX: This should be enough.  */
+#define DEV_SIZE 100
+  *device = grub_malloc (DEV_SIZE);
+  ptr = *device;
+  grub_snprintf (*device, DEV_SIZE,
+		 "%cd%u", (boot_drive & 0x80) ? 'h' : 'f',
+		 boot_drive & 0x7f);
+  ptr += grub_strlen (ptr);
+
+  if (dos_part != 0xff)
+    grub_snprintf (ptr, DEV_SIZE - (ptr - *device),
+		   ",%u", dos_part + 1);
+  ptr += grub_strlen (ptr);
+
+  if (bsd_part != 0xff)
+    grub_snprintf (ptr, DEV_SIZE - (ptr - *device), ",%u",
+		   bsd_part + 1);
+  ptr += grub_strlen (ptr);
+  *ptr = 0;
+}
+
+/* Add a memory region.  */
+static void
+add_mem_region (grub_addr_t addr, grub_size_t size)
+{
+  if (num_regions == MAX_REGIONS)
+    /* Ignore.  */
+    return;
+
+  mem_regions[num_regions].addr = addr;
+  mem_regions[num_regions].size = size;
+  num_regions++;
+}
+
+/* Compact memory regions.  */
+static void
+compact_mem_regions (void)
+{
+  int i, j;
+
+  /* Sort them.  */
+  for (i = 0; i < num_regions - 1; i++)
+    for (j = i + 1; j < num_regions; j++)
+      if (mem_regions[i].addr > mem_regions[j].addr)
+	{
+	  struct mem_region tmp = mem_regions[i];
+	  mem_regions[i] = mem_regions[j];
+	  mem_regions[j] = tmp;
+	}
+
+  /* Merge overlaps.  */
+  for (i = 0; i < num_regions - 1; i++)
+    if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr)
+      {
+	j = i + 1;
+
+	if (mem_regions[i].addr + mem_regions[i].size
+	    < mem_regions[j].addr + mem_regions[j].size)
+	  mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size
+				 - mem_regions[i].addr);
+
+	grub_memmove (mem_regions + j, mem_regions + j + 1,
+		      (num_regions - j - 1) * sizeof (struct mem_region));
+	i--;
+        num_regions--;
+      }
+}
+
+grub_addr_t grub_modbase;
+extern grub_uint8_t _start[], _edata[];
+
+/* Helper for grub_machine_init.  */
+static int
+mmap_iterate_hook (grub_uint64_t addr, grub_uint64_t size,
+		   grub_memory_type_t type,
+		   void *data __attribute__ ((unused)))
+{
+  /* Avoid the lower memory.  */
+  if (addr < GRUB_MEMORY_MACHINE_UPPER_START)
+    {
+      if (size <= GRUB_MEMORY_MACHINE_UPPER_START - addr)
+	return 0;
+
+      size -= GRUB_MEMORY_MACHINE_UPPER_START - addr;
+      addr = GRUB_MEMORY_MACHINE_UPPER_START;
+    }
+
+  /* Ignore >4GB.  */
+  if (addr <= 0xFFFFFFFF && type == GRUB_MEMORY_AVAILABLE)
+    {
+      grub_size_t len;
+
+      len = (grub_size_t) ((addr + size > 0xFFFFFFFF)
+	     ? 0xFFFFFFFF - addr
+	     : size);
+      add_mem_region (addr, len);
+    }
+
+  return 0;
+}
+
+extern grub_uint16_t grub_bios_via_workaround1, grub_bios_via_workaround2;
+
+/* Via needs additional wbinvd.  */
+static void
+grub_via_workaround_init (void)
+{
+  grub_uint32_t manufacturer[3], max_cpuid;
+  if (! grub_cpu_is_cpuid_supported ())
+    return;
+
+  grub_cpuid (0, max_cpuid, manufacturer[0], manufacturer[2], manufacturer[1]);
+
+  if (grub_memcmp (manufacturer, "CentaurHauls", 12) != 0)
+    return;
+
+  grub_bios_via_workaround1 = 0x090f;
+  grub_bios_via_workaround2 = 0x090f;
+  asm volatile ("wbinvd");
+}
+
+void
+grub_machine_init (void)
+{
+  int i;
+#if 0
+  int grub_lower_mem;
+#endif
+  grub_addr_t modend;
+
+  /* This has to happen before any BIOS calls. */
+  grub_via_workaround_init ();
+
+  grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - _start);
+
+  /* Initialize the console as early as possible.  */
+  grub_console_init ();
+
+  /* This sanity check is useless since top of GRUB_MEMORY_MACHINE_RESERVED_END
+     is used for stack and if it's unavailable we wouldn't have gotten so far.
+   */
+#if 0
+  grub_lower_mem = grub_get_conv_memsize () << 10;
+
+  /* Sanity check.  */
+  if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END)
+    grub_fatal ("too small memory");
+#endif
+
+/* FIXME: This prevents loader/i386/linux.c from using low memory.  When our
+   heap implements support for requesting a chunk in low memory, this should
+   no longer be a problem.  */
+#if 0
+  /* Add the lower memory into free memory.  */
+  if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END)
+    add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END,
+		    grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END);
+#endif
+
+  grub_machine_mmap_iterate (mmap_iterate_hook, NULL);
+
+  compact_mem_regions ();
+
+  modend = grub_modules_get_end ();
+  for (i = 0; i < num_regions; i++)
+    {
+      grub_addr_t beg = mem_regions[i].addr;
+      grub_addr_t fin = mem_regions[i].addr + mem_regions[i].size;
+      if (modend && beg < modend)
+	beg = modend;
+      if (beg >= fin)
+	continue;
+      grub_mm_init_region ((void *) beg, fin - beg);
+    }
+
+  grub_tsc_init ();
+}
+
+void
+grub_machine_fini (int flags)
+{
+  if (flags & GRUB_LOADER_FLAG_NORETURN)
+    grub_console_fini ();
+  grub_stop_floppy ();
+}
diff --git a/grub-core/kern/i386/pc/mmap.c b/grub-core/kern/i386/pc/mmap.c
new file mode 100644
index 0000000..c0c3c35
--- /dev/null
+++ b/grub-core/kern/i386/pc/mmap.c
@@ -0,0 +1,193 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008  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/machine/memory.h>
+#include <grub/machine/int.h>
+#include <grub/err.h>
+#include <grub/types.h>
+#include <grub/misc.h>
+
+struct grub_machine_mmap_entry
+{
+  grub_uint32_t size;
+  grub_uint64_t addr;
+  grub_uint64_t len;
+#define GRUB_MACHINE_MEMORY_AVAILABLE	1
+#define GRUB_MACHINE_MEMORY_RESERVED	2
+#define GRUB_MACHINE_MEMORY_ACPI	3
+#define GRUB_MACHINE_MEMORY_NVS 	4
+#define GRUB_MACHINE_MEMORY_BADRAM 	5
+  grub_uint32_t type;
+} GRUB_PACKED;
+
+
+/*
+ *
+ * grub_get_conv_memsize(i) :  return the conventional memory size in KB.
+ *	BIOS call "INT 12H" to get conventional memory size
+ *      The return value in AX.
+ */
+static inline grub_uint16_t
+grub_get_conv_memsize (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+  grub_bios_interrupt (0x12, &regs);
+  return regs.eax & 0xffff;
+}
+
+/*
+ * grub_get_ext_memsize() :  return the extended memory size in KB.
+ *	BIOS call "INT 15H, AH=88H" to get extended memory size
+ *	The return value in AX.
+ *
+ */
+static inline grub_uint16_t
+grub_get_ext_memsize (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.eax = 0x8800;
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+  grub_bios_interrupt (0x15, &regs);
+  return regs.eax & 0xffff;
+}
+
+/* Get a packed EISA memory map. Lower 16 bits are between 1MB and 16MB
+   in 1KB parts, and upper 16 bits are above 16MB in 64KB parts. If error, return zero.
+   BIOS call "INT 15H, AH=E801H" to get EISA memory map,
+     AX = memory between 1M and 16M in 1K parts.
+     BX = memory above 16M in 64K parts. 
+*/
+ 
+static inline grub_uint32_t
+grub_get_eisa_mmap (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+  regs.eax = 0xe801;
+  grub_bios_interrupt (0x15, &regs);
+
+  if ((regs.eax & 0xff00) == 0x8600)
+    return 0;
+
+  return (regs.eax & 0xffff) | (regs.ebx << 16);
+}
+
+/*
+ *
+ * grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to
+ *		start), for the Query System Address Map BIOS call.
+ *
+ *  Sets the first 4-byte int value of "addr" to the size returned by
+ *  the call.  If the call fails, sets it to zero.
+ *
+ *	Returns:  new (non-zero) continuation value, 0 if done.
+ */
+/* Get a memory map entry. Return next continuation value. Zero means
+   the end.  */
+static grub_uint32_t
+grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
+		     grub_uint32_t cont)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+
+  /* place address (+4) in ES:DI */
+  regs.es = ((grub_addr_t) &entry->addr) >> 4;
+  regs.edi = ((grub_addr_t) &entry->addr) & 0xf;
+	
+  /* set continuation value */
+  regs.ebx = cont;
+
+  /* set default maximum buffer size */
+  regs.ecx = sizeof (*entry) - sizeof (entry->size);
+
+  /* set EDX to 'SMAP' */
+  regs.edx = 0x534d4150;
+
+  regs.eax = 0xe820;
+  grub_bios_interrupt (0x15, &regs);
+
+  /* write length of buffer (zero if error) into ADDR */	
+  if ((regs.flags & GRUB_CPU_INT_FLAGS_CARRY) || regs.eax != 0x534d4150
+      || regs.ecx < 0x14 || regs.ecx > 0x400)
+    entry->size = 0;
+  else
+    entry->size = regs.ecx;
+
+  /* return the continuation value */
+  return regs.ebx;
+}
+
+grub_err_t
+grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+  grub_uint32_t cont = 0;
+  struct grub_machine_mmap_entry *entry
+    = (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+  int e820_works = 0;
+
+  while (1)
+    {
+      grub_memset (entry, 0, sizeof (*entry));
+
+      cont = grub_get_mmap_entry (entry, cont);
+
+      if (!entry->size)
+	break;
+
+      if (entry->len)
+	e820_works = 1;
+      if (entry->len
+	  && hook (entry->addr, entry->len,
+		   /* GRUB mmaps have been defined to match with
+		      the E820 definition.
+		      Therefore, we can just pass type through.  */
+		   entry->type, hook_data))
+	break;
+
+      if (! cont)
+	break;
+    }
+
+  if (!e820_works)
+    {
+      grub_uint32_t eisa_mmap = grub_get_eisa_mmap ();
+
+      if (hook (0x0, ((grub_uint32_t) grub_get_conv_memsize ()) << 10,
+		GRUB_MEMORY_AVAILABLE, hook_data))
+	return 0;
+
+      if (eisa_mmap)
+	{
+	  if (hook (0x100000, (eisa_mmap & 0xFFFF) << 10,
+		    GRUB_MEMORY_AVAILABLE, hook_data) == 0)
+	    hook (0x1000000, eisa_mmap & ~0xFFFF, GRUB_MEMORY_AVAILABLE,
+		  hook_data);
+	}
+      else
+	hook (0x100000, ((grub_uint32_t) grub_get_ext_memsize ()) << 10,
+	      GRUB_MEMORY_AVAILABLE, hook_data);
+    }
+
+  return 0;
+}
diff --git a/grub-core/kern/i386/pc/startup.S b/grub-core/kern/i386/pc/startup.S
new file mode 100644
index 0000000..b8a9b33
--- /dev/null
+++ b/grub-core/kern/i386/pc/startup.S
@@ -0,0 +1,217 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008,2009,2011 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/>.
+ */
+
+
+/*
+ * Note: These functions defined in this file may be called from C.
+ *       Be careful of that you must not modify some registers. Quote
+ *       from gcc-2.95.2/gcc/config/i386/i386.h:
+
+   1 for registers not available across function calls.
+   These must include the FIXED_REGISTERS and also any
+   registers that can be used without being saved.
+   The latter must include the registers where values are returned
+   and the register where structure-value addresses are passed.
+   Aside from that, you can include as many other registers as you like.
+
+  ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg
+{  1, 1, 1, 0, 0, 0, 0, 1, 1,  1,  1,  1,  1,  1,  1,  1,  1 }
+ */
+
+/*
+ * Note: GRUB is compiled with the options -mrtd and -mregparm=3.
+ *       So the first three arguments are passed in %eax, %edx, and %ecx,
+ *       respectively, and if a function has a fixed number of arguments
+ *       and the number is greater than three, the function must return
+ *       with "ret $N" where N is ((the number of arguments) - 3) * 4.
+ */
+
+#include <config.h>
+#include <grub/symbol.h>
+#include <multiboot.h>
+#ifdef __APPLE__
+#include <grub/i386/pc/memory.h>
+#endif
+
+	.file	"startup.S"
+
+	.text
+
+	.globl	start, _start, __start
+start:
+_start:
+__start:
+#ifdef __APPLE__
+LOCAL(start):
+#endif
+	.code32
+
+	movl	%ecx, (LOCAL(real_to_prot_addr) - _start) (%esi)
+	movl	%edi, (LOCAL(prot_to_real_addr) - _start) (%esi)
+	movl	%eax, (EXT_C(grub_realidt) - _start) (%esi)
+
+	/* copy back the decompressed part (except the modules) */
+#ifdef __APPLE__
+	movl	$EXT_C(_edata), %ecx
+	subl    $LOCAL(start), %ecx
+#else
+	movl	$(_edata - _start), %ecx
+#endif
+	movl	$(_start), %edi
+	rep
+	movsb
+
+	movl	$LOCAL (cont), %esi
+	jmp	*%esi
+LOCAL(cont):
+
+#if 0
+	/* copy modules before cleaning out the bss */
+	movl	EXT_C(grub_total_module_size), %ecx
+	movl	EXT_C(grub_kernel_image_size), %esi
+	addl	%ecx, %esi
+	addl	$_start, %esi
+	decl	%esi
+	movl	$END_SYMBOL, %edi
+	addl	%ecx, %edi
+	decl	%edi
+	std
+	rep
+	movsb
+#endif
+
+#ifdef __APPLE__
+	/* clean out the bss */
+	movl	$EXT_C(_edata), %edi
+
+	/* compute the bss length */
+	movl	$GRUB_MEMORY_MACHINE_SCRATCH_ADDR, %ecx
+#else
+	/* clean out the bss */
+	movl	$BSS_START_SYMBOL, %edi
+
+	/* compute the bss length */
+	movl	$END_SYMBOL, %ecx
+#endif
+	subl	%edi, %ecx
+
+	/* clean out */
+	xorl	%eax, %eax
+	cld
+	rep
+	stosb
+
+	movl	%edx, EXT_C(grub_boot_device)
+
+	/*
+	 *  Call the start of main body of C code.
+	 */
+	call EXT_C(grub_main)
+
+LOCAL(real_to_prot_addr):
+	.long 0
+LOCAL(prot_to_real_addr):
+	.long 0
+
+	.macro PROT_TO_REAL
+	movl	LOCAL(prot_to_real_addr), %eax
+	call	*%eax
+	.endm
+
+	.macro REAL_TO_PROT
+	movl	LOCAL(real_to_prot_addr), %eax
+	calll	*%eax
+	.endm
+
+/*
+ * grub_exit()
+ *
+ * Exit the system.
+ */
+FUNCTION(grub_exit)
+	PROT_TO_REAL
+	.code16
+	/* Tell the BIOS a boot failure. If this does not work, reboot.  */
+	int	$0x18
+	/* set 0x472 to 0x0000 for cold boot (0x1234 for warm boot) */
+	xorw	%ax, %ax
+	movw	$0x0472, %di
+	movw	%ax, (%di)
+	ljmp	$0xf000, $0xfff0
+	.code32
+
+/*
+ * int grub_pxe_call (int func, void* data, grub_uint32_t pxe_rm_entry);
+ */
+FUNCTION(grub_pxe_call)
+	pushl	%ebp
+	movl	%esp, %ebp
+	pushl	%esi
+	pushl	%edi
+	pushl	%ebx
+
+	movl	%ecx, %ebx
+	movl	%eax, %ecx
+	movl	%edx, %eax
+	andl	$0xF, %eax
+	shrl	$4, %edx
+	shll	$16, %edx
+	addl	%eax, %edx
+
+	PROT_TO_REAL
+	.code16
+
+	pushl	%ebx
+	pushl	%edx
+	pushw	%cx
+	movw	%sp, %bx
+	lcall	*%ss:6(%bx)
+	cld
+	addw	$10, %sp
+	movw	%ax, %cx
+
+	REAL_TO_PROT
+	.code32
+
+	movzwl	%cx, %eax
+
+	popl	%ebx
+	popl	%edi
+	popl	%esi
+	popl	%ebp
+	ret
+
+#include "../int.S"
+
+VARIABLE(grub_realidt)
+	.long 0
+
+#ifdef __APPLE__
+	/* Older versions of objconv assume that there is the same number
+	   of text and data sections. Hence this dummy.  */
+	.section __TEXT, __zz_dummy
+	.byte 0
+	.globl EXT_C(_edata)
+	.globl EXT_C(grub_boot_device)
+	.zerofill __DATA, __aa_before_bss, EXT_C(_edata), 1, 0
+	.zerofill __DATA, __bss, EXT_C(grub_boot_device), 4, 2
+#else
+	.bss
+VARIABLE(grub_boot_device)
+	.long	0
+#endif