| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 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 <arch/acpi.h> |
| #include <console/console.h> |
| #include <pc80/mc146818rtc.h> |
| #include <smbios.h> |
| #include <spi.h> |
| #include <spi_flash.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <elog.h> |
| #include "elog_internal.h" |
| |
| #if CONFIG_CHROMEOS |
| #include <vendorcode/google/chromeos/fmap.h> |
| #elif CONFIG_ELOG_FLASH_BASE == 0 |
| #error "CONFIG_ELOG_FLASH_BASE is invalid" |
| #endif |
| #if CONFIG_ELOG_FULL_THRESHOLD >= CONFIG_ELOG_AREA_SIZE |
| #error "CONFIG_ELOG_FULL_THRESHOLD is larger than CONFIG_ELOG_AREA_SIZE" |
| #endif |
| #if (CONFIG_ELOG_AREA_SIZE - CONFIG_ELOG_FULL_THRESHOLD) < (MAX_EVENT_SIZE + 1) |
| #error "CONFIG_ELOG_FULL_THRESHOLD is too small" |
| #endif |
| #if CONFIG_ELOG_SHRINK_SIZE >= CONFIG_ELOG_AREA_SIZE |
| #error "CONFIG_ELOG_SHRINK_SIZE is larger than CONFIG_ELOG_AREA_SIZE" |
| #endif |
| #if (CONFIG_ELOG_AREA_SIZE - CONFIG_ELOG_SHRINK_SIZE) > \ |
| CONFIG_ELOG_FULL_THRESHOLD |
| #error "CONFIG_ELOG_SHRINK_SIZE is too large" |
| #endif |
| |
| #if CONFIG_ELOG_DEBUG |
| #define elog_debug(STR...) printk(BIOS_DEBUG, STR) |
| #else |
| #define elog_debug(STR...) |
| #endif |
| |
| /* |
| * Static variables for ELOG state |
| */ |
| static int elog_initialized; |
| static struct spi_flash *elog_spi; |
| static struct elog_descriptor elog_flash_area; |
| static struct elog_descriptor elog_mem_area; |
| |
| static inline struct elog_descriptor* elog_get_mem(void) |
| { |
| return &elog_mem_area; |
| } |
| |
| static inline struct elog_descriptor* elog_get_flash(void) |
| { |
| return &elog_flash_area; |
| } |
| |
| /* |
| * Convert a memory mapped flash address into a flash offset |
| */ |
| static inline u32 elog_flash_address_to_offset(u8 *address) |
| { |
| if (!elog_spi) |
| return 0; |
| return (u32)address - ((u32)~0UL - elog_spi->size + 1); |
| } |
| |
| /* |
| * Convert a flash offset into a memory mapped flash address |
| */ |
| static inline u8* elog_flash_offset_to_address(u32 offset) |
| { |
| if (!elog_spi) |
| return NULL; |
| return (u8*)((u32)~0UL - elog_spi->size + 1 + offset); |
| } |
| |
| /* |
| * The ELOG header is at the very beginning of the area |
| */ |
| static inline struct elog_header* |
| elog_get_header(struct elog_descriptor *elog) |
| { |
| return elog->backing_store; |
| } |
| |
| /* |
| * Pointer to an event log header in the event data area |
| */ |
| static inline struct event_header* |
| elog_get_event_base(struct elog_descriptor *elog, u32 offset) |
| { |
| return (struct event_header *)&elog->data[offset]; |
| } |
| |
| /* |
| * Pointer to where the next event should be stored |
| */ |
| static inline struct event_header* |
| elog_get_next_event_base(struct elog_descriptor *elog) |
| { |
| return elog_get_event_base(elog, elog->next_event_offset); |
| } |
| |
| /* |
| * Pointer to the last logged event |
| */ |
| static inline struct event_header* |
| elog_get_last_event_base(struct elog_descriptor *elog) |
| { |
| return elog_get_event_base(elog, elog->last_event_offset); |
| } |
| |
| /* |
| * Update the checksum at the last byte |
| */ |
| static void elog_update_checksum(struct event_header *event, u8 checksum) |
| { |
| u8 *event_data = (u8*)event; |
| event_data[event->length - 1] = checksum; |
| } |
| |
| /* |
| * Simple byte checksum for events |
| */ |
| static u8 elog_checksum_event(struct event_header *event) |
| { |
| u8 index, checksum = 0; |
| u8 *data = (u8*)event; |
| |
| for (index = 0; index < event->length; index++) |
| checksum += data[index]; |
| return checksum; |
| } |
| |
| /* |
| * Check if a raw buffer is filled with ELOG_TYPE_EOL byte |
| */ |
| static int elog_is_buffer_clear(u8 *base, u32 size) |
| { |
| u8 *current = base; |
| u8 *end = current + size; |
| |
| elog_debug("elog_is_buffer_clear(base=0x%p size=%u)\n", base, size); |
| |
| for (; current != end; current++) { |
| if (*current != ELOG_TYPE_EOL) |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* |
| * Verify whether ELOG area is filled with ELOG_TYPE_EOL byte |
| */ |
| static int elog_is_area_clear(struct elog_descriptor *elog) |
| { |
| return elog_is_buffer_clear(elog->backing_store, elog->total_size); |
| } |
| |
| /* |
| * Check that the ELOG area has been initialized and is valid. |
| */ |
| static int elog_is_area_valid(struct elog_descriptor *elog) |
| { |
| elog_debug("elog_is_area_valid()\n"); |
| |
| if (elog->area_state != ELOG_AREA_HAS_CONTENT) |
| return 0; |
| if (elog->header_state != ELOG_HEADER_VALID) |
| return 0; |
| if (elog->event_buffer_state != ELOG_EVENT_BUFFER_OK) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Verify the contents of an ELOG Header structure |
| * Returns 1 if the header is valid, 0 otherwise |
| */ |
| static int elog_is_header_valid(struct elog_header *header) |
| { |
| elog_debug("elog_is_header_valid()\n"); |
| |
| if (header->magic != ELOG_SIGNATURE) { |
| printk(BIOS_ERR, "ELOG: header magic 0x%X != 0x%X\n", |
| header->magic, ELOG_SIGNATURE); |
| return 0; |
| } |
| if (header->version != ELOG_VERSION) { |
| printk(BIOS_ERR, "ELOG: header version %u != %u\n", |
| header->version, ELOG_VERSION); |
| return 0; |
| } |
| if (header->header_size != sizeof(*header)) { |
| printk(BIOS_ERR, "ELOG: header size mismatch %u != %u\n", |
| header->header_size, sizeof(*header)); |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* |
| * Validate the event header and data. |
| */ |
| static int elog_is_event_valid(struct elog_descriptor *elog, u32 offset) |
| { |
| struct event_header *event; |
| |
| event = elog_get_event_base(elog, offset); |
| if (!event) |
| return 0; |
| |
| /* Validate event length */ |
| if ((offsetof(struct event_header, type) + |
| sizeof(event->type) - 1 + offset) >= elog->data_size) |
| return 0; |
| |
| /* End of event marker has been found */ |
| if (event->type == ELOG_TYPE_EOL) |
| return 0; |
| |
| /* Check if event fits in area */ |
| if ((offsetof(struct event_header, length) + |
| sizeof(event->length) - 1 + offset) >= elog->data_size) |
| return 0; |
| |
| /* |
| * If the current event length + the current offset exceeds |
| * the area size then the event area is corrupt. |
| */ |
| if ((event->length + offset) >= elog->data_size) |
| return 0; |
| |
| /* Event length must be at least header size + checksum */ |
| if (event->length < (sizeof(*event) + 1)) |
| return 0; |
| |
| /* If event checksum is invalid the area is corrupt */ |
| if (elog_checksum_event(event) != 0) |
| return 0; |
| |
| /* Event is valid */ |
| return 1; |
| } |
| |
| /* |
| * Write 'size' bytes of data provided in 'buffer' into flash |
| * device at offset 'offset'. This will not erase the flash and |
| * it assumes the flash area is erased appropriately. |
| */ |
| static void elog_flash_write(u8 *address, u8 *buffer, u32 size) |
| { |
| u32 offset; |
| |
| if (!address || !buffer || !size || !elog_spi) |
| return; |
| |
| offset = elog_flash_address_to_offset(address); |
| |
| elog_debug("elog_flash_write(address=0x%p offset=0x%08x buffer=0x%p " |
| "size=%u)\n", address, offset, buffer, size); |
| |
| /* Write the data to flash */ |
| elog_spi->write(elog_spi, offset, size, buffer); |
| } |
| |
| /* |
| * Erase the first block specified in the address. |
| * Only handles flash area within a single flash block. |
| */ |
| static void elog_flash_erase(u8 *address, u32 size) |
| { |
| u32 offset; |
| |
| if (!address || !size || !elog_spi) |
| return; |
| |
| offset = elog_flash_address_to_offset(address); |
| |
| elog_debug("elog_flash_erase(address=0x%p offset=0x%08x size=%u)\n", |
| address, offset, size); |
| |
| /* Erase the sectors in this region */ |
| elog_spi->erase(elog_spi, offset, size); |
| } |
| |
| /* |
| * Scan the event area and validate each entry and |
| * update the ELOG descriptor state. |
| */ |
| static void elog_update_event_buffer_state(struct elog_descriptor *elog) |
| { |
| u32 count = 0; |
| u32 offset = 0; |
| u32 last_offset = 0; |
| u32 last_event_size = 0; |
| struct event_header *event; |
| |
| elog_debug("elog_update_event_buffer_state()\n"); |
| |
| /* Go through each event and validate it */ |
| while (1) { |
| event = elog_get_event_base(elog, offset); |
| |
| /* Do not de-reference anything past the area length */ |
| if ((offsetof(struct event_header, type) + |
| sizeof(event->type) - 1 + offset) >= elog->data_size) { |
| elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| break; |
| } |
| |
| /* The end of the event marker has been found */ |
| if (event->type == ELOG_TYPE_EOL) |
| break; |
| |
| /* Validate the event */ |
| if (!elog_is_event_valid(elog, offset)) { |
| elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| break; |
| } |
| |
| /* Move to the next event */ |
| count++; |
| last_offset = offset; |
| last_event_size = event->length; |
| offset += event->length; |
| } |
| |
| /* Ensure the remaining buffer is empty */ |
| if (!elog_is_buffer_clear(&elog->data[offset], |
| elog->data_size - offset)) |
| elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| |
| /* Update data into elog descriptor */ |
| elog->event_count = count; |
| elog->next_event_offset = offset; |
| elog->last_event_offset = last_offset; |
| elog->last_event_size = last_event_size; |
| } |
| |
| static void elog_validate_and_fill(struct elog_descriptor *elog) |
| { |
| elog_debug("elog_validate_and_fill()\n"); |
| |
| /* Check if the area is empty or not */ |
| if (elog_is_area_clear(elog)) { |
| elog->area_state = ELOG_AREA_EMPTY; |
| return; |
| } |
| |
| elog->area_state = ELOG_AREA_HAS_CONTENT; |
| |
| /* Validate the header */ |
| if (!elog_is_header_valid(elog->staging_header)) { |
| elog->header_state = ELOG_HEADER_INVALID; |
| return; |
| } |
| |
| elog->header_state = ELOG_HEADER_VALID; |
| elog_update_event_buffer_state(elog); |
| } |
| |
| /* |
| * Initialize a new ELOG descriptor |
| */ |
| static void elog_init_descriptor(struct elog_descriptor *elog, |
| elog_descriptor_type type, |
| u8 *buffer, u32 size, |
| struct elog_header *header) |
| { |
| elog_debug("elog_init_descriptor(type=%u buffer=0x%p size=%u)\n", |
| type, buffer, size); |
| |
| elog->type = type; |
| elog->area_state = ELOG_AREA_UNDEFINED; |
| elog->header_state = ELOG_HEADER_INVALID; |
| elog->event_buffer_state = ELOG_EVENT_BUFFER_OK; |
| elog->backing_store = buffer; |
| elog->total_size = size; |
| |
| /* Get staging header from backing store */ |
| elog->staging_header = header; |
| memcpy(header, buffer, sizeof(struct elog_header)); |
| |
| /* Data starts immediately after header */ |
| elog->data = &buffer[sizeof(struct elog_header)]; |
| elog->data_size = size - sizeof(struct elog_header); |
| |
| elog->next_event_offset = 0; |
| elog->last_event_offset = 0; |
| elog->last_event_size = 0; |
| elog->event_count = 0; |
| |
| elog_validate_and_fill(elog); |
| } |
| |
| /* |
| * Re-initialize an existing ELOG descriptor |
| */ |
| static void elog_reinit_descriptor(struct elog_descriptor *elog) |
| { |
| elog_debug("elog_reinit_descriptor()\n"); |
| elog_init_descriptor(elog, elog->type, elog->backing_store, |
| elog->total_size, elog->staging_header); |
| } |
| |
| /* |
| * Create ELOG descriptor data structures for all ELOG areas. |
| */ |
| static int elog_setup_descriptors(u32 flash_base, u32 area_size) |
| { |
| struct elog_header *staging_header; |
| u8 *area; |
| |
| elog_debug("elog_setup_descriptors(base=0x%08x size=%u)\n", |
| flash_base, area_size); |
| |
| /* Prepare flash descriptors */ |
| if (flash_base == 0) { |
| printk(BIOS_ERR, "ELOG: Invalid flash base\n"); |
| return -1; |
| } |
| |
| staging_header = malloc(sizeof(struct elog_header)); |
| if (!staging_header) { |
| printk(BIOS_ERR, "ELOG: Unable to allocate header\n"); |
| return -1; |
| } |
| |
| area = elog_flash_offset_to_address(flash_base); |
| if (!area) { |
| printk(BIOS_ERR, "ELOG: Unable to determine flash address\n"); |
| return -1; |
| } |
| elog_init_descriptor(elog_get_flash(), ELOG_DESCRIPTOR_FLASH, |
| area, area_size, staging_header); |
| |
| /* Initialize the memory area to look like a cleared flash area */ |
| area = malloc(area_size); |
| if (!area) { |
| printk(BIOS_ERR, "ELOG: Unable to allocate mem area\n"); |
| return -1; |
| } |
| memset(area, ELOG_TYPE_EOL, area_size); |
| elog_init_descriptor(elog_get_mem(), ELOG_DESCRIPTOR_MEMORY, |
| area, area_size, (struct elog_header *)area); |
| |
| return 0; |
| } |
| |
| static void elog_flash_erase_area(void) |
| { |
| struct elog_descriptor *elog = elog_get_flash(); |
| |
| elog_debug("elog_flash_erase_area()\n"); |
| |
| elog_flash_erase(elog->backing_store, elog->total_size); |
| elog_reinit_descriptor(elog); |
| } |
| |
| static void elog_prepare_empty(struct elog_descriptor *elog, |
| u8 *data, u32 data_size) |
| { |
| struct elog_header *header; |
| |
| elog_debug("elog_prepare_empty(%u bytes)\n", data_size); |
| |
| if (!elog_is_area_clear(elog)) |
| return; |
| |
| /* Write out the header */ |
| header = elog->staging_header; |
| header->magic = ELOG_SIGNATURE; |
| header->version = ELOG_VERSION; |
| header->header_size = sizeof(struct elog_header); |
| header->reserved[0] = ELOG_TYPE_EOL; |
| header->reserved[1] = ELOG_TYPE_EOL; |
| elog_flash_write(elog->backing_store, (u8*)header, |
| header->header_size); |
| |
| /* Write out the data */ |
| if (data) |
| elog_flash_write(elog->data, data, data_size); |
| |
| elog_reinit_descriptor(elog); |
| |
| /* Clear the log if corrupt */ |
| if (!elog_is_area_valid(elog)) |
| elog_flash_erase_area(); |
| } |
| |
| static int elog_sync_flash_to_mem(void) |
| { |
| struct elog_descriptor *mem = elog_get_mem(); |
| struct elog_descriptor *flash = elog_get_flash(); |
| |
| elog_debug("elog_sync_flash_to_mem()\n"); |
| |
| /* Fill with empty pattern first */ |
| memset(mem->backing_store, ELOG_TYPE_EOL, mem->total_size); |
| |
| /* Copy the header to memory */ |
| memcpy(mem->backing_store, flash->backing_store, |
| sizeof(struct elog_header)); |
| |
| /* Copy the valid flash contents to memory */ |
| memcpy(mem->data, flash->data, flash->next_event_offset); |
| |
| elog_reinit_descriptor(mem); |
| |
| return elog_is_area_valid(mem) ? 0 : -1; |
| } |
| |
| static int elog_sync_mem_to_flash(void) |
| { |
| struct elog_descriptor *mem = elog_get_mem(); |
| struct elog_descriptor *flash = elog_get_flash(); |
| u8 *src, *dest; |
| u32 size; |
| |
| elog_debug("elog_sync_mem_to_flash()\n"); |
| |
| /* |
| * In the case of a BIOS flash the active area will be cleared. |
| * One can catch this case and log the proper shutdown event by |
| * checking if the active flash elog is empty. Note that if the |
| * header size changes we will have corrupted the flash area. |
| * However that will be corrected on the next boot. |
| */ |
| if (elog_is_area_clear(flash)) { |
| elog_prepare_empty(flash, |
| (u8*)elog_get_last_event_base(mem), |
| mem->last_event_size); |
| elog_sync_flash_to_mem(); |
| return 0; |
| } |
| |
| /* Calculate the destination and source bases */ |
| dest = (u8*)elog_get_next_event_base(flash); |
| src = (u8*)elog_get_event_base(mem, flash->next_event_offset); |
| |
| /* Calculate how much data to sync */ |
| size = mem->next_event_offset - flash->next_event_offset; |
| |
| /* Write the log data */ |
| elog_flash_write(dest, src, size); |
| |
| /* Update descriptor */ |
| flash->event_count = mem->event_count; |
| flash->next_event_offset = mem->next_event_offset; |
| flash->last_event_offset = mem->last_event_offset; |
| flash->last_event_size = mem->last_event_size; |
| |
| return 0; |
| } |
| |
| /* |
| * Called during ELOG entry handler to prepare state for flash. |
| */ |
| static int elog_flash_area_bootstrap(void) |
| { |
| struct elog_descriptor *elog = elog_get_flash(); |
| |
| elog_debug("elog_flash_area_bootstrap()\n"); |
| |
| switch (elog->area_state) { |
| case ELOG_AREA_UNDEFINED: |
| printk(BIOS_ERR, "ELOG: flash area undefined\n"); |
| return -1; |
| |
| case ELOG_AREA_EMPTY: |
| /* Write a new header with no data */ |
| elog_prepare_empty(elog, NULL, 0); |
| break; |
| |
| case ELOG_AREA_HAS_CONTENT: |
| break; |
| } |
| |
| if (elog->header_state == ELOG_HEADER_INVALID) { |
| /* If the header is invalid no events can be salvaged |
| * so erase the entire area. */ |
| printk(BIOS_ERR, "ELOG: flash area header invalid\n"); |
| elog_flash_erase_area(); |
| elog_prepare_empty(elog, NULL, 0); |
| } |
| |
| if (elog->event_buffer_state == ELOG_EVENT_BUFFER_CORRUPTED) { |
| /* Wipe the source flash area */ |
| elog_flash_erase_area(); |
| elog_prepare_empty(elog, elog_get_mem()->data, |
| elog_get_mem()->next_event_offset); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Shrink the log, deleting old entries and moving the |
| * remining ones to the front of the log. |
| */ |
| static int elog_shrink(void) |
| { |
| struct elog_descriptor *mem = elog_get_mem(); |
| struct event_header *event; |
| u16 discard_count = 0; |
| u16 offset = 0; |
| |
| elog_debug("elog_shrink()\n"); |
| |
| if (mem->next_event_offset < CONFIG_ELOG_SHRINK_SIZE) |
| return 0; |
| |
| while (1) { |
| /* Next event has exceeded constraints */ |
| if (offset > CONFIG_ELOG_SHRINK_SIZE) |
| break; |
| |
| event = elog_get_event_base(mem, offset); |
| |
| /* Reached the end of the area */ |
| if (!event || event->type == ELOG_TYPE_EOL) |
| break; |
| |
| offset += event->length; |
| discard_count++; |
| } |
| |
| /* Erase flash area */ |
| elog_flash_erase_area(); |
| |
| /* Ensure the flash area was successfully erased */ |
| if (elog_get_flash()->next_event_offset >= CONFIG_ELOG_FULL_THRESHOLD) { |
| printk(BIOS_ERR, "Flash area was not erased!\n"); |
| return -1; |
| } |
| |
| /* Write new flash area */ |
| elog_prepare_empty(elog_get_flash(), |
| (u8*)elog_get_event_base(mem, offset), |
| mem->next_event_offset - offset); |
| |
| /* Update memory area from flash */ |
| if (elog_sync_flash_to_mem() < 0) { |
| printk(BIOS_ERR, "Unable to update memory area from flash\n"); |
| return -1; |
| } |
| |
| /* Add clear event */ |
| elog_add_event_word(ELOG_TYPE_LOG_CLEAR, offset); |
| |
| return 0; |
| } |
| |
| /* |
| * Initialize the SPI bus and probe for a flash chip |
| */ |
| static int elog_spi_init(void) |
| { |
| elog_debug("elog_spi_init()\n"); |
| |
| /* Prepare SPI subsystem */ |
| spi_init(); |
| |
| /* Look for flash chip */ |
| elog_spi = spi_flash_probe(0, 0, 0, 0); |
| |
| return elog_spi ? 0 : -1; |
| } |
| |
| /* |
| * Fill out SMBIOS Type 15 table entry so the |
| * event log can be discovered at runtime. |
| */ |
| int elog_smbios_write_type15(unsigned long *current, int handle) |
| { |
| struct smbios_type15 *t = (struct smbios_type15 *)*current; |
| int len = sizeof(struct smbios_type15); |
| |
| memset(t, 0, len); |
| t->type = SMBIOS_EVENT_LOG; |
| t->length = len - 2; |
| t->handle = handle; |
| t->area_length = elog_get_flash()->total_size - 1; |
| t->header_offset = 0; |
| t->data_offset = sizeof(struct elog_header); |
| t->access_method = SMBIOS_EVENTLOG_ACCESS_METHOD_MMIO32; |
| t->log_status = SMBIOS_EVENTLOG_STATUS_VALID; |
| t->change_token = 0; |
| t->address = (u32)elog_get_flash()->backing_store; |
| t->header_format = ELOG_HEADER_TYPE_OEM; |
| t->log_type_descriptors = 0; |
| t->log_type_descriptor_length = 2; |
| |
| *current += len; |
| return len; |
| } |
| |
| /* |
| * Clear the entire event log |
| */ |
| int elog_clear(void) |
| { |
| struct elog_descriptor *flash = elog_get_flash(); |
| |
| elog_debug("elog_clear()\n"); |
| |
| /* Erase flash area */ |
| elog_flash_erase_area(); |
| |
| /* Prepare new empty area */ |
| elog_prepare_empty(flash, NULL, 0); |
| |
| /* Update memory area from flash */ |
| if (elog_sync_flash_to_mem() < 0) |
| return -1; |
| |
| /* Log the clear event */ |
| elog_add_event_word(ELOG_TYPE_LOG_CLEAR, flash->total_size); |
| |
| return 0; |
| } |
| |
| /* |
| * Event log main entry point |
| */ |
| int elog_init(void) |
| { |
| u32 flash_base = CONFIG_ELOG_FLASH_BASE; |
| int flash_size = CONFIG_ELOG_AREA_SIZE; |
| #if CONFIG_CHROMEOS |
| u8 *flash_base_ptr; |
| #endif |
| |
| if (elog_initialized) |
| return 0; |
| |
| elog_debug("elog_init()\n"); |
| |
| /* Find SPI flash chip for backing store */ |
| if (elog_spi_init() < 0) { |
| printk(BIOS_ERR, "ELOG: Unable to find SPI flash\n"); |
| return -1; |
| } |
| |
| #if CONFIG_CHROMEOS |
| /* Find the ELOG base and size in FMAP */ |
| flash_size = find_fmap_entry("RW_ELOG", (void **)&flash_base_ptr); |
| if (flash_size < 0) { |
| printk(BIOS_WARNING, "ELOG: Unable to find RW_ELOG in FMAP, " |
| "using CONFIG_ELOG_FLASH_BASE instead\n"); |
| flash_size = CONFIG_ELOG_AREA_SIZE; |
| } else { |
| flash_base = elog_flash_address_to_offset(flash_base_ptr); |
| |
| /* Use configured size if smaller than FMAP size */ |
| if (flash_size > CONFIG_ELOG_AREA_SIZE) |
| flash_size = CONFIG_ELOG_AREA_SIZE; |
| } |
| #endif |
| |
| /* Setup descriptors for flash and memory areas */ |
| if (elog_setup_descriptors(flash_base, flash_size) < 0) { |
| printk(BIOS_ERR, "ELOG: Unable to initialize descriptors\n"); |
| return -1; |
| } |
| |
| /* Bootstrap the flash area */ |
| if (elog_flash_area_bootstrap() < 0) { |
| printk(BIOS_ERR, "ELOG: Unable to bootstrap flash area\n"); |
| return -1; |
| } |
| |
| /* Initialize the memory area */ |
| if (elog_sync_flash_to_mem() < 0) { |
| printk(BIOS_ERR, "ELOG: Unable to initialize memory area\n"); |
| return -1; |
| } |
| |
| elog_initialized = 1; |
| |
| printk(BIOS_INFO, "ELOG: MEM @0x%p FLASH @0x%p\n", |
| elog_get_mem()->backing_store, |
| elog_get_flash()->backing_store); |
| |
| printk(BIOS_INFO, "ELOG: areas are %d bytes, full threshold %d," |
| " shrink size %d\n", CONFIG_ELOG_AREA_SIZE, |
| CONFIG_ELOG_FULL_THRESHOLD, CONFIG_ELOG_SHRINK_SIZE); |
| |
| /* Log a clear event if necessary */ |
| if (elog_get_flash()->event_count == 0) |
| elog_add_event_word(ELOG_TYPE_LOG_CLEAR, |
| elog_get_flash()->total_size); |
| |
| /* Shrink the log if we are getting too full */ |
| if (elog_get_mem()->next_event_offset >= CONFIG_ELOG_FULL_THRESHOLD) |
| if (elog_shrink() < 0) |
| return -1; |
| |
| #if CONFIG_ELOG_BOOT_COUNT && !defined(__SMM__) |
| /* Log boot count event except in S3 resume */ |
| if (acpi_slp_type != 3) |
| elog_add_event_dword(ELOG_TYPE_BOOT, boot_count_read()); |
| #endif |
| |
| #if CONFIG_CMOS_POST && !defined(__SMM__) |
| /* Check and log POST codes from previous boot */ |
| cmos_post_log(); |
| #endif |
| |
| return 0; |
| } |
| |
| /* |
| * Populate timestamp in event header with current time |
| */ |
| static void elog_fill_timestamp(struct event_header *event) |
| { |
| event->second = cmos_read(RTC_CLK_SECOND); |
| event->minute = cmos_read(RTC_CLK_MINUTE); |
| event->hour = cmos_read(RTC_CLK_HOUR); |
| event->day = cmos_read(RTC_CLK_DAYOFMONTH); |
| event->month = cmos_read(RTC_CLK_MONTH); |
| event->year = cmos_read(RTC_CLK_YEAR); |
| |
| /* Basic sanity check of expected ranges */ |
| if (event->month > 0x12 || event->day > 0x31 || event->hour > 0x23 || |
| event->minute > 0x59 || event->second > 0x59) { |
| event->year = 0; |
| event->month = 0; |
| event->day = 0; |
| event->hour = 0; |
| event->minute = 0; |
| event->second = 0; |
| } |
| } |
| |
| /* |
| * Add an event to the memory area |
| */ |
| static int elog_add_event_mem(u8 event_type, void *data, u8 data_size) |
| { |
| struct event_header *event; |
| struct elog_descriptor *mem = elog_get_mem(); |
| u8 event_size; |
| |
| elog_debug("elog_add_event_mem(type=%X)\n", event_type); |
| |
| /* Make sure ELOG structures are initialized */ |
| if (elog_init() < 0) |
| return -1; |
| |
| /* Header + Data + Checksum */ |
| event_size = sizeof(*event) + data_size + 1; |
| if (event_size > MAX_EVENT_SIZE) { |
| printk(BIOS_ERR, "ELOG: Event(%X) data size too " |
| "big (%d)\n", event_type, event_size); |
| return -1; |
| } |
| |
| /* Make sure event data can fit */ |
| if ((mem->next_event_offset + event_size) >= mem->data_size) { |
| printk(BIOS_ERR, "ELOG: Event(%X) does not fit\n", |
| event_type); |
| return -1; |
| } |
| |
| /* Fill out event data */ |
| event = elog_get_next_event_base(mem); |
| event->type = event_type; |
| event->length = event_size; |
| elog_fill_timestamp(event); |
| |
| if (data_size) |
| memcpy(&event[1], data, data_size); |
| |
| /* Zero the checksum byte and then compute checksum */ |
| elog_update_checksum(event, 0); |
| elog_update_checksum(event, -(elog_checksum_event(event))); |
| |
| /* Update memory descriptor parameters */ |
| mem->event_count++; |
| mem->last_event_offset = mem->next_event_offset; |
| mem->last_event_size = event_size; |
| mem->next_event_offset += event_size; |
| |
| printk(BIOS_INFO, "ELOG: Event(%X) added with size %d\n", |
| event_type, event_size); |
| return 0; |
| } |
| |
| void elog_add_event_raw(u8 event_type, void *data, u8 data_size) |
| { |
| elog_debug("elog_add_event_raw(type=%X)\n", event_type); |
| |
| /* Add event to the memory area */ |
| if (elog_add_event_mem(event_type, data, data_size) < 0) { |
| printk(BIOS_ERR, "Unable to add event to memory area\n"); |
| return; |
| } |
| |
| /* Sync the memory buffer to flash */ |
| elog_sync_mem_to_flash(); |
| |
| /* Shrink the log if we are getting too full */ |
| if (elog_get_mem()->next_event_offset >= CONFIG_ELOG_FULL_THRESHOLD) |
| elog_shrink(); |
| } |
| |
| void elog_add_event(u8 event_type) |
| { |
| elog_add_event_raw(event_type, NULL, 0); |
| } |
| |
| void elog_add_event_byte(u8 event_type, u8 data) |
| { |
| elog_add_event_raw(event_type, &data, sizeof(data)); |
| } |
| |
| void elog_add_event_word(u8 event_type, u16 data) |
| { |
| elog_add_event_raw(event_type, &data, sizeof(data)); |
| } |
| |
| void elog_add_event_dword(u8 event_type, u32 data) |
| { |
| elog_add_event_raw(event_type, &data, sizeof(data)); |
| } |
| |
| void elog_add_event_wake(u8 source, u32 instance) |
| { |
| struct elog_event_data_wake wake = { |
| .source = source, |
| .instance = instance |
| }; |
| elog_add_event_raw(ELOG_TYPE_WAKE_SOURCE, &wake, sizeof(wake)); |
| } |