src/lib/romstage_stack.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 Google Inc.
   5  * Copyright (C) 2015-2016 Intel Corp.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <program_loading.h>
  18 #include <cbmem.h>
  19
  20 /*
  21  * Romstage needs quite a bit of stack for decompressing images since the lzma
  22  * lib keeps its state on the stack during romstage.
  23  */
  24 #define ROMSTAGE_RAM_STACK_SIZE 0x5000
  25
  26 uintptr_t romstage_ram_stack_base(size_t size, int src)
  27 {
  28         /* cbmem_add() does a find() before add(). */
  29         if (src == ROMSTAGE_STACK_CBMEM)
  30                 return (uintptr_t)cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, size);
  31         if (src == ROMSTAGE_STACK_LOW_MEM)
  32                 return CONFIG_RAMTOP - size;
  33         return 0;
  34 }
  35
  36 uintptr_t romstage_ram_stack_bottom(void)
  37 {
  38         return romstage_ram_stack_base(ROMSTAGE_RAM_STACK_SIZE,
  39                 ROMSTAGE_STACK_CBMEM);
  40 }
  41
  42 uintptr_t romstage_ram_stack_top(void)
  43 {
  44         uintptr_t stack_top = romstage_ram_stack_base(ROMSTAGE_RAM_STACK_SIZE,
  45                 ROMSTAGE_STACK_CBMEM);
  46         stack_top += ROMSTAGE_RAM_STACK_SIZE;
  47         return stack_top;
  48 }