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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <arch/acpi.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/tsc.h>
#include <rmodule.h>
#include <ramstage_cache.h>
#include <vendorcode/google/chromeos/vboot_handoff.h>
#include <baytrail/ramstage.h>
#include <baytrail/efi_wrapper.h>
static inline struct ramstage_cache *next_cache(struct ramstage_cache *c)
{
return (struct ramstage_cache *)&c->program[c->size];
}
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 ramstage_cache *c;
long cache_size;
printk(BIOS_DEBUG, "refcode loading from cache.\n");
c = ramstage_cache_location(&cache_size);
if (!ramstage_cache_is_valid(c)) {
printk(BIOS_DEBUG, "Invalid ramstage cache descriptor.\n");
return NULL;
}
c = next_cache(c);
if (!ramstage_cache_is_valid(c)) {
printk(BIOS_DEBUG, "Invalid refcode cache descriptor.\n");
return NULL;
}
printk(BIOS_DEBUG, "Loading cached reference code from 0x%08x(%x)\n",
c->load_address, c->size);
memcpy((void *)c->load_address, &c->program[0], c->size);
return (efi_wrapper_entry_t)c->entry_point;
}
static void cache_refcode(const struct rmod_stage_load *rsl)
{
struct ramstage_cache *c;
long cache_size;
c = ramstage_cache_location(&cache_size);
if (!ramstage_cache_is_valid(c)) {
printk(BIOS_DEBUG, "No place to cache reference code.\n");
return;
}
/* Determine how much remaining cache available. */
cache_size -= c->size + sizeof(*c);
if (cache_size < (sizeof(*c) + cbmem_entry_size(rsl->cbmem_entry))) {
printk(BIOS_DEBUG, "Not enough cache space for ref code.\n");
return;
}
c = next_cache(c);
c->magic = RAMSTAGE_CACHE_MAGIC;
c->entry_point = (uint32_t)rsl->entry;
c->load_address = (uint32_t)cbmem_entry_start(rsl->cbmem_entry);
c->size = cbmem_entry_size(rsl->cbmem_entry);;
printk(BIOS_DEBUG, "Caching refcode at 0x%p(%x)\n",
&c->program[0], c->size);
memcpy(&c->program[0], (void *)c->load_address, c->size);
}
static int load_refcode_from_vboot(struct rmod_stage_load *refcode,
struct cbfs_stage *stage)
{
printk(BIOS_DEBUG, "refcode loading from vboot rw area.\n");
if (rmodule_stage_load(refcode, stage) || refcode->entry == NULL) {
printk(BIOS_DEBUG, "Error loading reference code.\n");
return -1;
}
return 0;
}
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) || refcode->entry == NULL) {
printk(BIOS_DEBUG, "Error loading reference code.\n");
return -1;
}
return 0;
}
static efi_wrapper_entry_t load_reference_code(void)
{
struct vboot_handoff *vboot_handoff;
const struct firmware_component *fwc;
struct rmod_stage_load refcode = {
.cbmem_id = CBMEM_ID_REFCODE,
.name = CONFIG_CBFS_PREFIX "/refcode",
};
int ret;
if (acpi_is_wakeup_s3()) {
return load_refcode_from_cache();
}
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) {
ret = load_refcode_from_cbfs(&refcode);
} else {
ret = load_refcode_from_vboot(&refcode, (void *)fwc->address);
if (ret < 0)
ret = load_refcode_from_cbfs(&refcode);
}
if (ret < 0)
return NULL;
/* Cache loaded reference code. */
cache_refcode(&refcode);
return refcode.entry;
}
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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