kern/i386/coreboot/init.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/kernel.h>
  20 #include <grub/mm.h>
  21 #include <grub/machine/time.h>
  22 #include <grub/machine/init.h>
  23 #include <grub/machine/memory.h>
  24 #include <grub/machine/console.h>
  25 #include <grub/machine/kernel.h>
  26 #include <grub/types.h>
  27 #include <grub/err.h>
  28 #include <grub/dl.h>
  29 #include <grub/misc.h>
  30 #include <grub/loader.h>
  31 #include <grub/env.h>
  32 #include <grub/cache.h>
  33 #include <grub/time.h>
  34 #include <grub/symbol.h>
  35 #include <grub/cpu/io.h>
  36 #include <grub/cpu/kernel.h>
  37 #include <grub/cpu/tsc.h>
  38
  39 #define GRUB_FLOPPY_REG_DIGITAL_OUTPUT          0x3f2
  40
  41 extern char _start[];
  42 extern char _end[];
  43
  44 grub_addr_t grub_os_area_addr;
  45 grub_size_t grub_os_area_size;
  46
  47 grub_uint32_t
  48 grub_get_rtc (void)
  49 {
  50   grub_fatal ("grub_get_rtc() is not implemented.\n");
  51 }
  52
  53 /* Stop the floppy drive from spinning, so that other software is
  54    jumped to with a known state.  */
  55 void
  56 grub_stop_floppy (void)
  57 {
  58   grub_outb (0, GRUB_FLOPPY_REG_DIGITAL_OUTPUT);
  59 }
  60
  61 void
  62 grub_exit (void)
  63 {
  64   grub_fatal ("grub_exit() is not implemented.\n");
  65 }
  66
  67 void
  68 grub_arch_sync_caches (void *address __attribute__ ((unused)),
  69                        grub_size_t len __attribute__ ((unused)))
  70 {
  71 }
  72
  73 void
  74 grub_machine_init (void)
  75 {
  76   /* Initialize the console as early as possible.  */
  77   grub_vga_text_init ();
  78
  79   auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t, grub_uint64_t, grub_uint32_t);
  80   int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
  81   {
  82 #if GRUB_CPU_SIZEOF_VOID_P == 4
  83     /* Restrict ourselves to 32-bit memory space.  */
  84     if (addr > GRUB_ULONG_MAX)
  85       return 0;
  86     if (addr + size > GRUB_ULONG_MAX)
  87       size = GRUB_ULONG_MAX - addr;
  88 #endif
  89
  90     if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
  91       return 0;
  92
  93     /* Avoid the lower memory.  */
  94     if (addr < GRUB_MEMORY_MACHINE_LOWER_SIZE)
  95       {
  96         if (addr + size <= GRUB_MEMORY_MACHINE_LOWER_SIZE)
  97           return 0;
  98         else
  99           {
 100             size -= GRUB_MEMORY_MACHINE_LOWER_SIZE - addr;
 101             addr = GRUB_MEMORY_MACHINE_LOWER_SIZE;
 102           }
 103       }
 104
 105     if (addr == GRUB_MEMORY_MACHINE_UPPER_START
 106         || (addr >= GRUB_MEMORY_MACHINE_LOWER_SIZE
 107             && addr <= GRUB_MEMORY_MACHINE_UPPER_START
 108             && (addr + size > GRUB_MEMORY_MACHINE_UPPER_START)))
 109       {
 110         grub_size_t quarter = size >> 2;
 111
 112         grub_os_area_addr = addr;
 113         grub_os_area_size = size - quarter;
 114         grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size),
 115                              quarter);
 116       }
 117     else
 118       grub_mm_init_region ((void *) (grub_addr_t) addr, (grub_size_t) size);
 119
 120     return 0;
 121   }
 122
 123   grub_machine_mmap_init ();
 124   grub_machine_mmap_iterate (heap_init);
 125
 126   grub_tsc_init ();
 127 }
 128
 129 void
 130 grub_machine_set_prefix (void)
 131 {
 132   /* Initialize the prefix.  */
 133   grub_env_set ("prefix", grub_prefix);
 134 }
 135
 136 void
 137 grub_machine_fini (void)
 138 {
 139   grub_vga_text_fini ();
 140   grub_stop_floppy ();
 141 }
 142
 143 /* Return the end of the core image.  */
 144 grub_addr_t
 145 grub_arch_modules_addr (void)
 146 {
 147   return ALIGN_UP((grub_addr_t) _end, GRUB_MOD_ALIGN);
 148 }