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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/romstage.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <program_loading.h>
#include <reset.h>
#include <rmodule.h>
#include <romstage_handoff.h>
#include <security/vboot/vboot_common.h>
#include <stage_cache.h>
#include <timestamp.h>
#include <types.h>
static size_t var_mtrr_ctx_size(void)
{
int mtrr_count = get_var_mtrr_count();
return sizeof(struct var_mtrr_context) + mtrr_count * 2 * sizeof(msr_t);
}
static enum cb_err postcar_frame_init(struct postcar_frame *pcf)
{
memset(pcf, 0, sizeof(*pcf));
struct var_mtrr_context *ctx;
ctx = cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, var_mtrr_ctx_size());
if (ctx == NULL) {
printk(BIOS_ERR, "Couldn't add var_mtrr_ctx setup in cbmem.\n");
return CB_ERR;
}
pcf->mtrr = ctx;
var_mtrr_context_init(pcf->mtrr);
return CB_SUCCESS;
}
void postcar_frame_add_mtrr(struct postcar_frame *pcf,
uintptr_t addr, size_t size, int type)
{
var_mtrr_set(pcf->mtrr, addr, size, type);
}
void postcar_frame_add_romcache(struct postcar_frame *pcf, int type)
{
if (!CONFIG(BOOT_DEVICE_MEMORY_MAPPED))
return;
postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type);
}
static void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
{
if (pcf->skip_common_mtrr)
return;
/* Cache the ROM as WP just below 4GiB. */
postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
}
static void run_postcar_phase(struct postcar_frame *pcf);
/* prepare_and_run_postcar() determines the stack to use after
* cache-as-ram is torn down as well as the MTRR settings to use. */
void __noreturn prepare_and_run_postcar(void)
{
struct postcar_frame pcf;
if (postcar_frame_init(&pcf))
die("Unable to initialize postcar frame.\n");
fill_postcar_frame(&pcf);
postcar_frame_common_mtrrs(&pcf);
run_postcar_phase(&pcf);
/* We do not return here. */
die("Failed to load postcar\n!");
}
static void finalize_load(uintptr_t *reloc_params, uintptr_t mtrr_frame_ptr)
{
*reloc_params = mtrr_frame_ptr;
/*
* Signal to rest of system that another update was made to the
* postcar program prior to running it.
*/
prog_segment_loaded((uintptr_t)reloc_params, sizeof(uintptr_t), SEG_FINAL);
prog_segment_loaded((uintptr_t)mtrr_frame_ptr, var_mtrr_ctx_size(), SEG_FINAL);
}
static void load_postcar_cbfs(struct prog *prog, struct postcar_frame *pcf)
{
struct rmod_stage_load rsl = {
.cbmem_id = CBMEM_ID_AFTER_CAR,
.prog = prog,
};
if (rmodule_stage_load(&rsl))
die_with_post_code(POSTCODE_INVALID_ROM,
"Failed to load after CAR program.\n");
/* Set the stack pointer within parameters of the program loaded. */
if (rsl.params == NULL)
die_with_post_code(POSTCODE_INVALID_ROM,
"No parameters found in after CAR program.\n");
finalize_load(rsl.params, (uintptr_t)pcf->mtrr);
stage_cache_add(STAGE_POSTCAR, prog);
}
/*
* Cache the TSEG region at the top of ram. This region is
* not restricted to SMM mode until SMM has been relocated.
* By setting the region to cacheable it provides faster access
* when relocating the SMM handler as well as using the TSEG
* region for other purposes.
*/
void postcar_enable_tseg_cache(struct postcar_frame *pcf)
{
uintptr_t smm_base;
size_t smm_size;
smm_region(&smm_base, &smm_size);
postcar_frame_add_mtrr(pcf, smm_base, smm_size,
MTRR_TYPE_WRBACK);
}
static void postcar_cache_invalid(void)
{
printk(BIOS_ERR, "postcar cache invalid.\n");
board_reset();
}
/*
* POSTCAR will call invd so don't make assumptions on cbmem
* and external stage cache being UC.
*/
static void postcar_flush_cache(void)
{
uintptr_t cbmem_base;
size_t cbmem_size;
uintptr_t stage_cache_base;
size_t stage_cache_size;
if (cbmem_get_region((void **)&cbmem_base, &cbmem_size))
die("Could not find cbmem region");
prog_segment_loaded(cbmem_base, cbmem_size, SEG_FINAL);
if (CONFIG(TSEG_STAGE_CACHE) && !romstage_handoff_is_resume()) {
stage_cache_external_region((void **)&stage_cache_base, &stage_cache_size);
prog_segment_loaded(stage_cache_base, stage_cache_size, SEG_FINAL);
}
}
static void run_postcar_phase(struct postcar_frame *pcf)
{
struct prog prog =
PROG_INIT(PROG_POSTCAR, CONFIG_CBFS_PREFIX "/postcar");
vboot_run_logic();
if (resume_from_stage_cache()) {
stage_cache_load_stage(STAGE_POSTCAR, &prog);
/* This is here to allow platforms to pass different stack
parameters between S3 resume and normal boot. On the
platforms where the values are the same it's a nop. */
finalize_load(prog.arg, (uintptr_t)pcf->mtrr);
if (prog_entry(&prog) == NULL)
postcar_cache_invalid();
} else
load_postcar_cbfs(&prog, pcf);
/* As postcar exist, it's end of romstage here */
timestamp_add_now(TS_ROMSTAGE_END);
console_time_report();
postcar_flush_cache();
prog_set_arg(&prog, (void *)cbmem_top());
prog_run(&prog);
}
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