diff options
Diffstat (limited to 'src/vendorcode/google/chromeos/vboot1/vboot_loader.c')
| -rw-r--r-- | src/vendorcode/google/chromeos/vboot1/vboot_loader.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/src/vendorcode/google/chromeos/vboot1/vboot_loader.c b/src/vendorcode/google/chromeos/vboot1/vboot_loader.c new file mode 100644 index 0000000000..0353a3a08e --- /dev/null +++ b/src/vendorcode/google/chromeos/vboot1/vboot_loader.c @@ -0,0 +1,416 @@ +/* + * 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 <arch/stages.h> +#include <stdint.h> +#include <stddef.h> +#include <string.h> +#include <cbfs.h> +#include <cbmem.h> +#include <console/console.h> +#include <console/vtxprintf.h> +#include <program_loading.h> +#include <tpm.h> +#include <reset.h> +#include <romstage_handoff.h> +#include <rmodule.h> +#include <string.h> +#include <stdlib.h> +#include <timestamp.h> +#include "../chromeos.h" +#include "../vboot_context.h" +#include "../vboot_handoff.h" + +#define TEMP_CBMEM_ID_VBOOT 0xffffffff +#define TEMP_CBMEM_ID_VBLOCKS 0xfffffffe + +static void vboot_run_stub(struct vboot_context *context) +{ + struct rmod_stage_load rmod_stage = { + .cbmem_id = TEMP_CBMEM_ID_VBOOT, + .name = CONFIG_CBFS_PREFIX "/vboot", + }; + void (*entry)(struct vboot_context *context); + + if (rmodule_stage_load_from_cbfs(&rmod_stage)) { + printk(BIOS_DEBUG, "Could not load vboot stub.\n"); + goto out; + } + + entry = rmod_stage.entry; + + /* Call stub. */ + entry(context); + +out: + /* Tear down the region no longer needed. */ + if (rmod_stage.cbmem_entry != NULL) + cbmem_entry_remove(rmod_stage.cbmem_entry); +} + +/* Helper routines for the vboot stub. */ +static void log_msg(const char *fmt, va_list args) +{ + do_vtxprintf(fmt, args); +} + +static void fatal_error(void) +{ + printk(BIOS_ERR, "vboot encountered fatal error. Resetting.\n"); + hard_reset(); +} + +static int fw_region_size(struct vboot_region *r) +{ + struct vboot_components *fw_info; + int32_t size; + int i; + + fw_info = vboot_locate_components(r); + if (fw_info == NULL) + return -1; + + if (fw_info->num_components > MAX_PARSED_FW_COMPONENTS) + return -1; + + size = sizeof(*fw_info); + size += sizeof(struct vboot_component_entry) * fw_info->num_components; + + for (i = 0; i < fw_info->num_components; i++) + size += ALIGN(fw_info->entries[i].size, sizeof(uint32_t)); + + /* Check that size of comopnents does not exceed the region's size. */ + if (size > r->size) + return -1; + + /* Update region with the correct size. */ + r->size = size; + + return 0; +} + +static int vboot_fill_params(struct vboot_context *ctx) +{ + VbCommonParams *cparams; + VbSelectFirmwareParams *fparams; + + if (fw_region_size(&ctx->fw_a)) + return -1; + + if (fw_region_size(&ctx->fw_b)) + return -1; + + cparams = ctx->cparams; + fparams = ctx->fparams; + + cparams->gbb_size = ctx->gbb.size; + fparams->verification_size_A = ctx->vblock_a.size; + fparams->verification_size_B = ctx->vblock_b.size; + + if (IS_ENABLED(CONFIG_SPI_FLASH_MEMORY_MAPPED)) { + /* Get memory-mapped pointers to the regions. */ + cparams->gbb_data = vboot_get_region(ctx->gbb.offset_addr, + ctx->gbb.size, NULL); + fparams->verification_block_A = + vboot_get_region(ctx->vblock_a.offset_addr, + ctx->vblock_a.size, NULL); + fparams->verification_block_B = + vboot_get_region(ctx->vblock_b.offset_addr, + ctx->vblock_b.size, NULL); + } else { + /* + * Copy the vblock info into a buffer in cbmem. The gbb will + * be read using VbExRegionRead(). + */ + char *dest; + size_t vblck_sz; + + vblck_sz = ctx->vblock_a.size + ctx->vblock_b.size; + ctx->vblocks = cbmem_entry_add(TEMP_CBMEM_ID_VBLOCKS, vblck_sz); + if (ctx->vblocks == NULL) + return -1; + dest = cbmem_entry_start(ctx->vblocks); + if (vboot_get_region(ctx->vblock_a.offset_addr, + ctx->vblock_a.size, dest) == NULL) + return -1; + fparams->verification_block_A = (void *)dest; + dest += ctx->vblock_a.size; + if (vboot_get_region(ctx->vblock_b.offset_addr, + ctx->vblock_b.size, dest) == NULL) + return -1; + fparams->verification_block_B = (void *)dest; + } + + return 0; +} + +static void fill_handoff(struct vboot_context *context) +{ + struct vboot_components *fw_info; + struct vboot_region *region; + int i; + + /* Fix up the handoff structure. */ + context->handoff->selected_firmware = + context->fparams->selected_firmware; + + /* Parse out the components for downstream consumption. */ + if (context->handoff->selected_firmware == VB_SELECT_FIRMWARE_A) + region = &context->fw_a; + else if (context->handoff->selected_firmware == VB_SELECT_FIRMWARE_B) + region = &context->fw_b; + else + return; + + fw_info = vboot_locate_components(region); + if (fw_info == NULL) + return; + + for (i = 0; i < fw_info->num_components; i++) { + context->handoff->components[i].address = + region->offset_addr + fw_info->entries[i].offset; + context->handoff->components[i].size = fw_info->entries[i].size; + } +} + +static void vboot_clean_up(struct vboot_context *context) +{ + if (context->vblocks != NULL) + cbmem_entry_remove(context->vblocks); +} + +static void reset(void) +{ + hard_reset(); +} + +static void vboot_invoke_wrapper(struct vboot_handoff *vboot_handoff) +{ + VbCommonParams cparams; + VbSelectFirmwareParams fparams; + struct vboot_context context; + uint32_t *iflags; + + vboot_handoff->selected_firmware = VB_SELECT_FIRMWARE_READONLY; + + memset(&cparams, 0, sizeof(cparams)); + memset(&fparams, 0, sizeof(fparams)); + memset(&context, 0, sizeof(context)); + + iflags = &vboot_handoff->init_params.flags; + if (get_developer_mode_switch()) + *iflags |= VB_INIT_FLAG_DEV_SWITCH_ON; + if (get_recovery_mode_switch()) { + clear_recovery_mode_switch(); + *iflags |= VB_INIT_FLAG_REC_BUTTON_PRESSED; + } + if (get_write_protect_state()) + *iflags |= VB_INIT_FLAG_WP_ENABLED; + if (vboot_get_sw_write_protect()) + *iflags |= VB_INIT_FLAG_SW_WP_ENABLED; + if (CONFIG_VIRTUAL_DEV_SWITCH) + *iflags |= VB_INIT_FLAG_VIRTUAL_DEV_SWITCH; + if (CONFIG_EC_SOFTWARE_SYNC) { + *iflags |= VB_INIT_FLAG_EC_SOFTWARE_SYNC; + *iflags |= VB_INIT_FLAG_VIRTUAL_REC_SWITCH; + } + if (CONFIG_VBOOT_EC_SLOW_UPDATE) + *iflags |= VB_INIT_FLAG_EC_SLOW_UPDATE; + if (CONFIG_VBOOT_OPROM_MATTERS) { + *iflags |= VB_INIT_FLAG_OPROM_MATTERS; + /* Will load VGA option rom during this boot */ + if (developer_mode_enabled() || recovery_mode_enabled() || + vboot_wants_oprom()) { + *iflags |= VB_INIT_FLAG_OPROM_LOADED; + } + } + + context.handoff = vboot_handoff; + context.cparams = &cparams; + context.fparams = &fparams; + + cparams.shared_data_blob = &vboot_handoff->shared_data[0]; + cparams.shared_data_size = VB_SHARED_DATA_MIN_SIZE; + cparams.caller_context = &context; + + vboot_locate_region("GBB", &context.gbb); + vboot_locate_region("VBLOCK_A", &context.vblock_a); + vboot_locate_region("VBLOCK_B", &context.vblock_b); + vboot_locate_region("FW_MAIN_A", &context.fw_a); + vboot_locate_region("FW_MAIN_B", &context.fw_b); + + /* Check all fmap entries. */ + if (context.fw_a.size < 0 || context.fw_b.size < 0 || + context.vblock_a.size < 0 || context.vblock_b.size < 0 || + context.gbb.size < 0) { + printk(BIOS_DEBUG, "Not all fmap entries found for vboot.\n"); + return; + } + + /* Fill in vboot parameters. */ + if (vboot_fill_params(&context)) { + vboot_clean_up(&context); + return; + } + + /* Initialize callbacks. */ + context.read_vbnv = &read_vbnv; + context.save_vbnv = &save_vbnv; + context.tis_init = &tis_init; + context.tis_open = &tis_open; + context.tis_close = &tis_close; + context.tis_sendrecv = &tis_sendrecv; + context.log_msg = &log_msg; + context.fatal_error = &fatal_error; + context.get_region = &vboot_get_region; + context.reset = &reset; + + vboot_run_stub(&context); + + fill_handoff(&context); + + vboot_clean_up(&context); +} + +#if CONFIG_RELOCATABLE_RAMSTAGE +static void *vboot_load_ramstage(uint32_t cbmem_id, const char *name, + const struct cbmem_entry **cbmem_entry) +{ + struct vboot_handoff *vboot_handoff; + struct cbfs_stage *stage; + const struct firmware_component *fwc; + struct rmod_stage_load rmod_load = { + .cbmem_id = cbmem_id, + .name = name, + }; + + timestamp_add_now(TS_START_VBOOT); + + vboot_handoff = cbmem_add(CBMEM_ID_VBOOT_HANDOFF, + sizeof(*vboot_handoff)); + + if (vboot_handoff == NULL) { + printk(BIOS_DEBUG, "Could not add vboot_handoff structure.\n"); + return NULL; + } + + memset(vboot_handoff, 0, sizeof(*vboot_handoff)); + + vboot_invoke_wrapper(vboot_handoff); + + timestamp_add_now(TS_END_VBOOT); + + /* Take RO firmware path since no RW area was selected. */ + if (vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_A && + vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_B) { + printk(BIOS_DEBUG, "No RW firmware selected: 0x%08x\n", + vboot_handoff->selected_firmware); + return NULL; + } + + if (CONFIG_VBOOT_RAMSTAGE_INDEX >= MAX_PARSED_FW_COMPONENTS) { + printk(BIOS_ERR, "Invalid ramstage index: %d\n", + CONFIG_VBOOT_RAMSTAGE_INDEX); + return NULL; + } + + /* Check for invalid address. */ + fwc = &vboot_handoff->components[CONFIG_VBOOT_RAMSTAGE_INDEX]; + if (fwc->address == 0) { + printk(BIOS_DEBUG, "RW ramstage image address invalid.\n"); + return NULL; + } + + printk(BIOS_DEBUG, "RW ramstage image at 0x%08x, 0x%08x bytes.\n", + fwc->address, fwc->size); + + stage = (void *)fwc->address; + + if (rmodule_stage_load(&rmod_load, stage)) { + vboot_handoff->selected_firmware = VB_SELECT_FIRMWARE_READONLY; + printk(BIOS_DEBUG, "Could not load ramstage region.\n"); + return NULL; + } + + *cbmem_entry = rmod_load.cbmem_entry; + + return rmod_load.entry; +} +#else /* CONFIG_RELOCATABLE_RAMSTAGE */ +static void vboot_load_ramstage(struct vboot_handoff *vboot_handoff, + struct romstage_handoff *handoff) +{ + struct cbfs_stage *stage; + const struct firmware_component *fwc; + + if (CONFIG_VBOOT_RAMSTAGE_INDEX >= MAX_PARSED_FW_COMPONENTS) { + printk(BIOS_ERR, "Invalid ramstage index: %d\n", + CONFIG_VBOOT_RAMSTAGE_INDEX); + return; + } + + /* Check for invalid address. */ + fwc = &vboot_handoff->components[CONFIG_VBOOT_RAMSTAGE_INDEX]; + if (fwc->address == 0) { + printk(BIOS_DEBUG, "RW ramstage image address invalid.\n"); + return; + } + + printk(BIOS_DEBUG, "RW ramstage image at 0x%08x, 0x%08x bytes.\n", + fwc->address, fwc->size); + + /* This will leak a mapping. */ + stage = vboot_get_region(fwc->address, fwc->size, NULL); + + if (stage == NULL) { + printk(BIOS_DEBUG, "Unable to get RW ramstage region.\n"); + return; + } + + timestamp_add_now(TS_START_COPYRAM); + + /* Stages rely the below clearing so that the bss is initialized. */ + memset((void *) (uintptr_t) stage->load, 0, stage->memlen); + + if (cbfs_decompress(stage->compression, + ((unsigned char *) stage) + + sizeof(struct cbfs_stage), + (void *) (uintptr_t) stage->load, + stage->len)) + return; + + timestamp_add_now(TS_END_COPYRAM); + +#if CONFIG_ARCH_X86 + __asm__ volatile ( + "movl $0, %%ebp\n" + "jmp *%%edi\n" + :: "D"(stage->entry) + ); +#elif CONFIG_ARCH_ARM + stage_exit((void *)(uintptr_t)stage->entry); +#endif +} +#endif /* CONFIG_RELOCATABLE_RAMSTAGE */ + + +const struct ramstage_loader_ops vboot_ramstage_loader = { + .name = "VBOOT", + .load = vboot_load_ramstage, +}; |