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
  37 #define GRUB_FLOPPY_REG_DIGITAL_OUTPUT          0x3f2
  38
  39 extern char _start[];
  40 extern char _end[];
  41
  42 grub_addr_t grub_os_area_addr;
  43 grub_size_t grub_os_area_size;
  44 grub_size_t grub_lower_mem, grub_upper_mem;
  45
  46 /* FIXME: we need interrupts to do this right */
  47 static grub_uint32_t grub_time_tics = 0;
  48
  49 grub_uint32_t
  50 grub_get_rtc (void)
  51 {
  52   return grub_time_tics;
  53 }
  54
  55 /* Stop the floppy drive from spinning, so that other software is
  56    jumped to with a known state.  */
  57 void
  58 grub_stop_floppy (void)
  59 {
  60   grub_outb (0, GRUB_FLOPPY_REG_DIGITAL_OUTPUT);
  61 }
  62
  63 void
  64 grub_exit (void)
  65 {
  66   grub_printf ("grub_exit() is not implemented.\n");
  67   grub_stop ();
  68 }
  69
  70 void
  71 grub_arch_sync_caches (void *address __attribute__ ((unused)),
  72                        grub_size_t len __attribute__ ((unused)))
  73 {
  74 }
  75
  76 void
  77 grub_machine_init (void)
  78 {
  79   /* Initialize the console as early as possible.  */
  80   grub_console_init ();
  81
  82   grub_lower_mem = GRUB_MEMORY_MACHINE_LOWER_USABLE;
  83   grub_upper_mem = 0;
  84
  85   auto int heap_init (mem_region_t);
  86   int heap_init (mem_region_t mem_region)
  87   {
  88     grub_uint64_t addr = mem_region->addr;
  89     grub_uint64_t size = mem_region->size;
  90
  91 #if GRUB_CPU_SIZEOF_VOID_P == 4
  92     /* Restrict ourselves to 32-bit memory space.  */
  93     if (addr > ULONG_MAX)
  94       {
  95         grub_upper_mem = ULONG_MAX;
  96         return 0;
  97       }
  98     if (addr + size > ULONG_MAX)
  99       size = ULONG_MAX - addr;
 100 #endif
 101
 102     grub_upper_mem = grub_max (grub_upper_mem, addr + size);
 103
 104     if (mem_region->type != GRUB_LINUXBIOS_MEMORY_AVAILABLE)
 105       return 0;
 106
 107     /* Avoid the lower memory.  */
 108     if (addr < GRUB_MEMORY_MACHINE_LOWER_SIZE)
 109       {
 110         if (addr + size <= GRUB_MEMORY_MACHINE_LOWER_SIZE)
 111           return 0;
 112         else
 113           {
 114             size -= GRUB_MEMORY_MACHINE_LOWER_SIZE - addr;
 115             addr = GRUB_MEMORY_MACHINE_LOWER_SIZE;
 116           }
 117       }
 118
 119     if (addr == GRUB_MEMORY_MACHINE_UPPER_START
 120         || (addr >= GRUB_MEMORY_MACHINE_LOWER_SIZE
 121             && addr <= GRUB_MEMORY_MACHINE_UPPER_START
 122             && (addr + size > GRUB_MEMORY_MACHINE_UPPER_START)))
 123       {
 124         grub_size_t quarter = size >> 2;
 125
 126         grub_os_area_addr = addr;
 127         grub_os_area_size = size - quarter;
 128         grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size),
 129                              quarter);
 130       }
 131     else
 132       grub_mm_init_region ((void *) (grub_addr_t) addr, (grub_size_t) size);
 133
 134     return 0;
 135   }
 136
 137   grub_available_iterate (heap_init);
 138
 139   /* This variable indicates size, not offset.  */
 140   grub_upper_mem -= GRUB_MEMORY_MACHINE_UPPER_START;
 141
 142   grub_tsc_init ();
 143 }
 144
 145 void
 146 grub_machine_set_prefix (void)
 147 {
 148   /* Initialize the prefix.  */
 149   grub_env_set ("prefix", grub_prefix);
 150 }
 151
 152 void
 153 grub_machine_fini (void)
 154 {
 155   grub_console_fini ();
 156 }
 157
 158 /* Return the end of the core image.  */
 159 grub_addr_t
 160 grub_arch_modules_addr (void)
 161 {
 162   return ALIGN_UP((grub_addr_t) _end, GRUB_MOD_ALIGN);
 163 }