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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/cpu.h>
#include <console/console.h>
#include <cpu/intel/romstage.h>
#include <cpu/x86/mtrr.h>
#include <arch/symbols.h>
#include <program_loading.h>
#define DCACHE_RAM_ROMSTAGE_STACK_SIZE 0x2000
asmlinkage void *romstage_main(unsigned long bist)
{
int i;
const int num_guards = 4;
const u32 stack_guard = 0xdeadbeef;
u32 *stack_base;
u32 size;
/* Size of unallocated CAR. */
size = _car_region_end - _car_relocatable_data_end;
size = ALIGN_DOWN(size, 16);
size = MIN(size, DCACHE_RAM_ROMSTAGE_STACK_SIZE);
if (size < DCACHE_RAM_ROMSTAGE_STACK_SIZE)
printk(BIOS_DEBUG, "Romstage stack size limited to 0x%x!\n",
size);
stack_base = (u32 *) (_car_region_end - size);
for (i = 0; i < num_guards; i++)
stack_base[i] = stack_guard;
mainboard_romstage_entry(bist);
/* Check the stack. */
for (i = 0; i < num_guards; i++) {
if (stack_base[i] == stack_guard)
continue;
printk(BIOS_DEBUG, "Smashed stack detected in romstage!\n");
}
if (!IS_ENABLED(CONFIG_POSTCAR_STAGE))
return setup_stack_and_mtrrs();
platform_enter_postcar();
/* We do not return. */
return NULL;
}
asmlinkage void romstage_after_car(void)
{
/* Load the ramstage. */
run_ramstage();
}
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