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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <string.h>
#include <arch/acpi.h>
#include <cbmem.h>
#include <console/console.h>
#include <console/streams.h>
#include <cpu/x86/tsc.h>
#include <program_loading.h>
#include <rmodule.h>
#include <stage_cache.h>
#if IS_ENABLED(CONFIG_CHROMEOS)
#include <vendorcode/google/chromeos/vboot_handoff.h>
#endif
#include <soc/ramstage.h>
#include <soc/efi_wrapper.h>
static void ABI_X86 send_to_console(unsigned char b)
{
console_tx_byte(b);
}
static efi_wrapper_entry_t load_refcode_from_cache(void)
{
struct prog refcode;
printk(BIOS_DEBUG, "refcode loading from cache.\n");
stage_cache_load_stage(STAGE_REFCODE, &refcode);
return (efi_wrapper_entry_t)prog_entry(&refcode);
}
static void cache_refcode(const struct rmod_stage_load *rsl)
{
stage_cache_add(STAGE_REFCODE, rsl->prog);
}
#if IS_ENABLED(CONFIG_CHROMEOS)
static int load_refcode_from_vboot(struct rmod_stage_load *refcode)
{
struct vboot_handoff *vboot_handoff;
const struct firmware_component *fwc;
struct cbfs_stage *stage;
vboot_handoff = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
fwc = &vboot_handoff->components[CONFIG_VBOOT_REFCODE_INDEX];
if (vboot_handoff == NULL ||
vboot_handoff->selected_firmware == VB_SELECT_FIRMWARE_READONLY ||
CONFIG_VBOOT_REFCODE_INDEX >= MAX_PARSED_FW_COMPONENTS ||
fwc->size == 0 || fwc->address == 0)
return -1;
printk(BIOS_DEBUG, "refcode loading from vboot rw area.\n");
stage = (void *)(uintptr_t)fwc->address;
if (rmodule_stage_load(refcode, stage)) {
printk(BIOS_DEBUG, "Error loading reference code.\n");
return -1;
}
return 0;
}
#else
static int load_refcode_from_vboot(struct rmod_stage_load *refcode)
{
return -1;
}
#endif
static int load_refcode_from_cbfs(struct rmod_stage_load *refcode)
{
printk(BIOS_DEBUG, "refcode loading from cbfs.\n");
if (rmodule_stage_load_from_cbfs(refcode)) {
printk(BIOS_DEBUG, "Error loading reference code.\n");
return -1;
}
return 0;
}
static efi_wrapper_entry_t load_reference_code(void)
{
struct prog prog = {
.name = CONFIG_CBFS_PREFIX "/refcode",
};
struct rmod_stage_load refcode = {
.cbmem_id = CBMEM_ID_REFCODE,
.prog = &prog,
};
if (acpi_is_wakeup_s3()) {
return load_refcode_from_cache();
}
if (load_refcode_from_vboot(&refcode) ||
load_refcode_from_cbfs(&refcode))
return NULL;
/* Cache loaded reference code. */
cache_refcode(&refcode);
return prog_entry(&prog);
}
void baytrail_run_reference_code(void)
{
int ret;
efi_wrapper_entry_t entry;
struct efi_wrapper_params wrp = {
.version = EFI_WRAPPER_VER,
.console_out = send_to_console,
};
entry = load_reference_code();
if (entry == NULL)
return;
wrp.tsc_ticks_per_microsecond = tsc_freq_mhz();
/* Call into reference code. */
ret = entry(&wrp);
if (ret != 0) {
printk(BIOS_DEBUG, "Reference code returned %d\n", ret);
return;
}
}
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