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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/cpu.h>
#include <arch/romstage.h>
#include <bootblock_common.h>
#include <console/console.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <arch/symbols.h>
#include <commonlib/helpers.h>
#include <program_loading.h>
#include <timestamp.h>
#include <security/vboot/vboot_common.h>
/* If we do not have a constrained _car_stack region size, use the
following as a guideline for acceptable stack usage. */
#define DCACHE_RAM_ROMSTAGE_STACK_SIZE 0x2000
static struct postcar_frame early_mtrrs;
static void romstage_main(unsigned long bist)
{
int i;
const int num_guards = 64;
const u32 stack_guard = 0xdeadbeef;
u32 *stack_base;
u32 size;
const size_t stack_size = MAX(CONFIG_DCACHE_BSP_STACK_SIZE,
DCACHE_RAM_ROMSTAGE_STACK_SIZE);
/* Size of unallocated CAR. */
size = ALIGN_DOWN(_car_stack_size, 16);
size = MIN(size, stack_size);
if (size < stack_size)
printk(BIOS_DEBUG, "Romstage stack size limited to 0x%x!\n",
size);
stack_base = (u32 *) (_ecar_stack - size);
for (i = 0; i < num_guards; i++)
stack_base[i] = stack_guard;
if (CONFIG(VBOOT_EARLY_EC_SYNC))
vboot_sync_ec();
mainboard_romstage_entry();
/* 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 (CONFIG(SMM_TSEG))
smm_list_regions();
prepare_and_run_postcar(&early_mtrrs);
/* We do not return here. */
}
/* We don't carry BIST from bootblock in a good location to read from.
* Any error should have been reported in bootblock already.
*/
#define NO_BIST 0
asmlinkage void car_stage_entry(void)
{
timestamp_add_now(TS_START_ROMSTAGE);
/* Assumes the hardware was set up during the bootblock */
console_init();
romstage_main(NO_BIST);
}
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