| /* |
| * 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 int is_s3_resume(void) |
| { |
| #if CONFIG_HAVE_ACPI_RESUME |
| return acpi_slp_type == 3; |
| #else |
| return 0; |
| #endif |
| } |
| |
| 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 (is_s3_resume()) { |
| 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; |
| } |
| } |
| |