arch/common/boot/grub2/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
  38 #define GRUB_FLOPPY_REG_DIGITAL_OUTPUT          0x3f2
  39
  40 extern char _start[];
  41 extern char _end[];
  42
  43 grub_addr_t grub_os_area_addr;
  44 grub_size_t grub_os_area_size;
  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_vga_text_init ();
  81   grub_at_keyboard_init ();
  82
  83   auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t, grub_uint64_t, grub_uint32_t);
  84   int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
  85   {
  86 #if GRUB_CPU_SIZEOF_VOID_P == 4
  87     /* Restrict ourselves to 32-bit memory space.  */
  88     if (addr > ULONG_MAX)
  89       {
  90         grub_upper_mem = ULONG_MAX;
  91         return 0;
  92       }
  93     if (addr + size > ULONG_MAX)
  94       size = ULONG_MAX - addr;
  95 #endif
  96
  97     grub_upper_mem = grub_max (grub_upper_mem, addr + size);
  98
  99     if (type != GRUB_MACHINE_MEMORY_AVAILABLE)
 100       return 0;
 101
 102     /* Avoid the lower memory.  */
 103     if (addr < GRUB_MEMORY_MACHINE_LOWER_SIZE)
 104       {
 105         if (addr + size <= GRUB_MEMORY_MACHINE_LOWER_SIZE)
 106           return 0;
 107         else
 108           {
 109             size -= GRUB_MEMORY_MACHINE_LOWER_SIZE - addr;
 110             addr = GRUB_MEMORY_MACHINE_LOWER_SIZE;
 111           }
 112       }
 113
 114     if (addr == GRUB_MEMORY_MACHINE_UPPER_START
 115         || (addr >= GRUB_MEMORY_MACHINE_LOWER_SIZE
 116             && addr <= GRUB_MEMORY_MACHINE_UPPER_START
 117             && (addr + size > GRUB_MEMORY_MACHINE_UPPER_START)))
 118       {
 119         grub_size_t quarter = size >> 2;
 120
 121         grub_os_area_addr = addr;
 122         grub_os_area_size = size - quarter;
 123         grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size),
 124                              quarter);
 125       }
 126     else
 127       grub_mm_init_region ((void *) (grub_addr_t) addr, (grub_size_t) size);
 128
 129     return 0;
 130   }
 131
 132   grub_machine_mmap_init ();
 133   grub_machine_mmap_iterate (heap_init);
 134
 135   /* This variable indicates size, not offset.  */
 136   grub_upper_mem -= GRUB_MEMORY_MACHINE_UPPER_START;
 137
 138   grub_tsc_init ();
 139 }
 140
 141 void
 142 grub_machine_set_prefix (void)
 143 {
 144   /* Initialize the prefix.  */
 145   grub_env_set ("prefix", grub_prefix);
 146 }
 147
 148 void
 149 grub_machine_fini (void)
 150 {
 151   grub_at_keyboard_fini ();
 152   grub_vga_text_fini ();
 153 }
 154
 155 /* Return the end of the core image.  */
 156 grub_addr_t
 157 grub_arch_modules_addr (void)
 158 {
 159   return ALIGN_UP((grub_addr_t) _end, GRUB_MOD_ALIGN);
 160 }