diff options
Diffstat (limited to 'src/vendorcode/google/chromeos')
| -rw-r--r-- | src/vendorcode/google/chromeos/Makefile.inc | 7 | ||||
| -rw-r--r-- | src/vendorcode/google/chromeos/vbnv_cmos.c (renamed from src/vendorcode/google/chromeos/vbnv.c) | 0 | ||||
| -rw-r--r-- | src/vendorcode/google/chromeos/vbnv_ec.c | 140 |
3 files changed, 145 insertions, 2 deletions
diff --git a/src/vendorcode/google/chromeos/Makefile.inc b/src/vendorcode/google/chromeos/Makefile.inc index ccde71a102..b9e42da92c 100644 --- a/src/vendorcode/google/chromeos/Makefile.inc +++ b/src/vendorcode/google/chromeos/Makefile.inc @@ -17,9 +17,12 @@ ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ## -romstage-$(CONFIG_ARCH_ROMSTAGE_X86_32) += vbnv.c -ramstage-$(CONFIG_ARCH_RAMSTAGE_X86_32) += vbnv.c +romstage-$(CONFIG_ARCH_ROMSTAGE_X86_32) += vbnv_cmos.c +ramstage-$(CONFIG_ARCH_RAMSTAGE_X86_32) += vbnv_cmos.c +romstage-$(CONFIG_ARCH_ROMSTAGE_ARMV7) += vbnv_ec.c +ramstage-$(CONFIG_ARCH_RAMSTAGE_ARMV7) += vbnv_ec.c romstage-$(CONFIG_ARCH_ROMSTAGE_X86_32) += vboot.c + ramstage-y += gnvs.c romstage-y += fmap.c ramstage-y += fmap.c diff --git a/src/vendorcode/google/chromeos/vbnv.c b/src/vendorcode/google/chromeos/vbnv_cmos.c index a13726d04b..a13726d04b 100644 --- a/src/vendorcode/google/chromeos/vbnv.c +++ b/src/vendorcode/google/chromeos/vbnv_cmos.c diff --git a/src/vendorcode/google/chromeos/vbnv_ec.c b/src/vendorcode/google/chromeos/vbnv_ec.c new file mode 100644 index 0000000000..78da5414d4 --- /dev/null +++ b/src/vendorcode/google/chromeos/vbnv_ec.c @@ -0,0 +1,140 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. + * + * 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 <types.h> +#include <string.h> +#include <console/console.h> +#include <arch/early_variables.h> +#include <ec/google/chromeec/ec.h> +#include "chromeos.h" + +#define VBNV_BLOCK_SIZE 16 /* Size of NV storage block in bytes */ + +/* Constants for NV storage. We use this rather than structs and + * bitfields so the data format is consistent across platforms and + * compilers. + */ +#define HEADER_OFFSET 0 +#define HEADER_MASK 0xC0 +#define HEADER_SIGNATURE 0x40 +#define HEADER_FIRMWARE_SETTINGS_RESET 0x20 +#define HEADER_KERNEL_SETTINGS_RESET 0x10 + +#define BOOT_OFFSET 1 +#define BOOT_DEBUG_RESET_MODE 0x80 +#define BOOT_DISABLE_DEV_REQUEST 0x40 +#define BOOT_OPROM_NEEDED 0x20 +#define BOOT_TRY_B_COUNT_MASK 0x0F + +#define RECOVERY_OFFSET 2 +#define LOCALIZATION_OFFSET 3 + +#define DEV_FLAGS_OFFSET 4 +#define DEV_BOOT_USB_MASK 0x01 +#define DEV_BOOT_SIGNED_ONLY_MASK 0x02 + +#define KERNEL_FIELD_OFFSET 11 +#define CRC_OFFSET 15 + +static int vbnv_initialized CAR_GLOBAL; +static uint8_t vbnv[VBNV_BLOCK_SIZE] CAR_GLOBAL; + +/* Wrappers for accessing the variables marked as CAR_GLOBAL. */ +static inline int is_vbnv_initialized(void) +{ + return car_get_var(vbnv_initialized); +} + +static inline uint8_t *vbnv_data_addr(int index) +{ + uint8_t *vbnv_arr = car_get_var_ptr(vbnv); + + return &vbnv_arr[index]; +} + +static inline uint8_t vbnv_data(int index) +{ + return *vbnv_data_addr(index); +} + +/* Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A + * table-based algorithm would be faster, but for only 15 bytes isn't + * worth the code size. + */ + +static uint8_t crc8(const uint8_t * data, int len) +{ + unsigned crc = 0; + int i, j; + + for (j = len; j; j--, data++) { + crc ^= (*data << 8); + for (i = 8; i; i--) { + if (crc & 0x8000) + crc ^= (0x1070 << 3); + crc <<= 1; + } + } + + return (uint8_t) (crc >> 8); +} + +void read_vbnv(uint8_t *vbnv_copy) +{ + google_chromeec_vbnv_context(1, vbnv_copy, VBNV_BLOCK_SIZE); + + /* Check data for consistency */ + if ((HEADER_SIGNATURE != (vbnv_copy[HEADER_OFFSET] & HEADER_MASK)) + || (crc8(vbnv_copy, CRC_OFFSET) != vbnv_copy[CRC_OFFSET])) { + + /* Data is inconsistent (bad CRC or header), + * so reset to defaults + */ + memset(vbnv_copy, 0, VBNV_BLOCK_SIZE); + vbnv_copy[HEADER_OFFSET] = + (HEADER_SIGNATURE | HEADER_FIRMWARE_SETTINGS_RESET | + HEADER_KERNEL_SETTINGS_RESET); + } +} + +void save_vbnv(const uint8_t *vbnv_copy) +{ + google_chromeec_vbnv_context(0, (uint8_t *)vbnv_copy, VBNV_BLOCK_SIZE); +} + +static void vbnv_setup(void) +{ + read_vbnv(vbnv_data_addr(0)); + car_set_var(vbnv_initialized, 1); +} + +int get_recovery_mode_from_vbnv(void) +{ + if (!is_vbnv_initialized()) + vbnv_setup(); + return vbnv_data(RECOVERY_OFFSET); +} + +int vboot_wants_oprom(void) +{ + if (!is_vbnv_initialized()) + vbnv_setup(); + + return (vbnv_data(BOOT_OFFSET) & BOOT_OPROM_NEEDED) ? 1 : 0; +} |