diff options
Diffstat (limited to 'src/vendorcode/google/chromeos/vboot2/verstub.c')
-rw-r--r-- | src/vendorcode/google/chromeos/vboot2/verstub.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/vendorcode/google/chromeos/vboot2/verstub.c b/src/vendorcode/google/chromeos/vboot2/verstub.c new file mode 100644 index 0000000000..e8faa071c5 --- /dev/null +++ b/src/vendorcode/google/chromeos/vboot2/verstub.c @@ -0,0 +1,97 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 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 <cbfs.h> +#include <console/console.h> +#include <string.h> +#include "../chromeos.h" +#include "misc.h" +#include "symbols.h" + +static struct vb2_working_data *init_vb2_working_data(void) +{ + struct vb2_working_data *wd; + + wd = vboot_get_working_data(); + memset(wd, 0, _vboot2_work_size); + /* 8-byte alignment for ARMv7 */ + wd->buffer = ALIGN_UP((uintptr_t)&wd[1], 8); + wd->buffer_size = _vboot2_work_size + (uintptr_t)wd + - (uintptr_t)wd->buffer; + + return wd; +} + +/** + * Verify a slot and jump to the next stage + * + * This could be either part of the (1) bootblock or the (2) verstage, depending + * on CONFIG_RETURN_FROM_VERSTAGE. + * + * 1) It jumps to the verstage and comes back, then, loads the romstage over the + * verstage space and exits to it. (note the cbfs cache is trashed on return + * from the verstage.) + * + * 2) We're already in the verstage. Verify firmware, then load the romstage and + * exits to it. + */ +void vboot2_verify_firmware(void) +{ + void *entry; + struct vb2_working_data *wd; + + wd = init_vb2_working_data(); + +#if CONFIG_RETURN_FROM_VERSTAGE + /* load verstage from RO */ + entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, + CONFIG_CBFS_PREFIX "/verstage"); + if (entry == (void *)-1) + die("failed to load verstage"); + + /* verify and select a slot */ + stage_exit(entry); +#else + verstage_main(); +#endif /* CONFIG_RETURN_FROM_VERSTAGE */ + + /* jump to the selected slot */ + entry = NULL; + if (vboot_is_slot_selected(wd)) { + /* RW A or B */ + struct vboot_region fw_main; + struct vboot_components *fw_info; + vb2_get_selected_region(wd, &fw_main); + fw_info = vboot_locate_components(&fw_main); + if (fw_info == NULL) + die("failed to locate firmware components\n"); + entry = vboot_load_stage(CONFIG_VBOOT_ROMSTAGE_INDEX, + &fw_main, fw_info); + } else if (vboot_is_readonly_path(wd)) { + /* RO */ + entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, + CONFIG_CBFS_PREFIX "/romstage"); + } + + if (entry != NULL && entry != (void *)-1) + stage_exit(entry); + + die("failed to exit from stage\n"); +} |