grub-core/lib/ieee1275/relocator.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2010  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/relocator.h>
  20 #include <grub/relocator_private.h>
  21 #include <grub/memory.h>
  22 #include <grub/ieee1275/ieee1275.h>
  23
  24 /* Helper for grub_relocator_firmware_get_max_events.  */
  25 static int
  26 count (grub_uint64_t addr __attribute__ ((unused)),
  27        grub_uint64_t len __attribute__ ((unused)),
  28        grub_memory_type_t type __attribute__ ((unused)), void *data)
  29 {
  30   int *counter = data;
  31
  32   (*counter)++;
  33   return 0;
  34 }
  35
  36 unsigned
  37 grub_relocator_firmware_get_max_events (void)
  38 {
  39   int counter = 0;
  40
  41   grub_machine_mmap_iterate (count, &counter);
  42   return 2 * counter;
  43 }
  44
  45 /* Context for grub_relocator_firmware_fill_events.  */
  46 struct grub_relocator_firmware_fill_events_ctx
  47 {
  48   struct grub_relocator_mmap_event *events;
  49   int counter;
  50 };
  51
  52 /* Helper for grub_relocator_firmware_fill_events.  */
  53 static int
  54 grub_relocator_firmware_fill_events_iter (grub_uint64_t addr,
  55                                           grub_uint64_t len,
  56                                           grub_memory_type_t type, void *data)
  57 {
  58   struct grub_relocator_firmware_fill_events_ctx *ctx = data;
  59
  60   if (type != GRUB_MEMORY_AVAILABLE)
  61     return 0;
  62
  63   if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM))
  64     {
  65       if (addr + len <= 0x180000)
  66         return 0;
  67
  68       if (addr < 0x180000)
  69         {
  70           len = addr + len - 0x180000;
  71           addr = 0x180000;
  72         }
  73     }
  74
  75   ctx->events[ctx->counter].type = REG_FIRMWARE_START;
  76   ctx->events[ctx->counter].pos = addr;
  77   ctx->counter++;
  78   ctx->events[ctx->counter].type = REG_FIRMWARE_END;
  79   ctx->events[ctx->counter].pos = addr + len;
  80   ctx->counter++;
  81
  82   return 0;
  83 }
  84
  85 unsigned
  86 grub_relocator_firmware_fill_events (struct grub_relocator_mmap_event *events)
  87 {
  88   struct grub_relocator_firmware_fill_events_ctx ctx = {
  89     .events = events,
  90     .counter = 0
  91   };
  92
  93   grub_machine_mmap_iterate (grub_relocator_firmware_fill_events_iter, &ctx);
  94   return ctx.counter;
  95 }
  96
  97 int
  98 grub_relocator_firmware_alloc_region (grub_addr_t start, grub_size_t size)
  99 {
 100   grub_err_t err;
 101   err = grub_claimmap (start, size);
 102   grub_errno = 0;
 103   return (err == 0);
 104 }
 105
 106 void
 107 grub_relocator_firmware_free_region (grub_addr_t start, grub_size_t size)
 108 {
 109   grub_ieee1275_release (start, size);
 110 }