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android13/external/vboot_reference/host/arch/x86/lib/crossystem_arch.c

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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <linux/nvram.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "crossystem.h"
#include "crossystem_arch.h"
#include "host_common.h"
#include "utility.h"
#include "vboot_common.h"
#include "vboot_nvstorage.h"
#include "vboot_struct.h"
/* ACPI constants from Chrome OS Main Processor Firmware Spec */
/* Boot reasons from BINF.0, from early H2C firmware */
/* Unknown */
#define BINF0_UNKNOWN 0
/* Normal boot to Chrome OS */
#define BINF0_NORMAL 1
/* Developer mode boot (developer mode warning displayed) */
#define BINF0_DEVELOPER 2
/* Recovery initiated by user, using recovery button */
#define BINF0_RECOVERY_BUTTON 3
/* Recovery initiated by user pressing a key at developer mode warning
* screen */
#define BINF0_RECOVERY_DEV_SCREEN_KEY 4
/* Recovery caused by BIOS failed signature check (neither rewritable
* firmware was valid) */
#define BINF0_RECOVERY_RW_FW_BAD 5
/* Recovery caused by no OS kernel detected */
#define BINF0_RECOVERY_NO_OS 6
/* Recovery caused by OS kernel failed signature check */
#define BINF0_RECOVERY_BAD_OS 7
/* Recovery initiated by OS */
#define BINF0_RECOVERY_OS_INITIATED 8
/* OS-initiated S3 diagnostic path (debug mode boot) */
#define BINF0_S3_DIAGNOSTIC_PATH 9
/* S3 resume failed */
#define BINF0_S3_RESUME_FAILED 10
/* Recovery caused by TPM error */
#define BINF0_RECOVERY_TPM_ERROR 11
/* CHSW bitflags */
#define CHSW_RECOVERY_BOOT 0x00000002
#define CHSW_RECOVERY_EC_BOOT 0x00000004
#define CHSW_DEV_BOOT 0x00000020
#define CHSW_WP_BOOT 0x00000200
/* CMOS reboot field bitflags */
#define CMOSRF_RECOVERY 0x80
#define CMOSRF_DEBUG_RESET 0x40
#define CMOSRF_TRY_B 0x20
/* GPIO signal types */
#define GPIO_SIGNAL_TYPE_RECOVERY 1
#define GPIO_SIGNAL_TYPE_DEV 2
#define GPIO_SIGNAL_TYPE_WP 3
/* Base name for ACPI files */
#define ACPI_BASE_PATH "/sys/devices/platform/chromeos_acpi"
/* Paths for frequently used ACPI files */
#define ACPI_BINF_PATH ACPI_BASE_PATH "/BINF"
#define ACPI_CHNV_PATH ACPI_BASE_PATH "/CHNV"
#define ACPI_CHSW_PATH ACPI_BASE_PATH "/CHSW"
#define ACPI_FMAP_PATH ACPI_BASE_PATH "/FMAP"
#define ACPI_GPIO_PATH ACPI_BASE_PATH "/GPIO"
#define ACPI_VBNV_PATH ACPI_BASE_PATH "/VBNV"
#define ACPI_VDAT_PATH ACPI_BASE_PATH "/VDAT"
/* Base name for GPIO files */
#define GPIO_BASE_PATH "/sys/class/gpio"
#define GPIO_EXPORT_PATH GPIO_BASE_PATH "/export"
/* Filename for NVRAM file */
#define NVRAM_PATH "/dev/nvram"
/* Filename for legacy firmware update tries */
#define NEED_FWUPDATE_PATH "/mnt/stateful_partition/.need_firmware_update"
/* Filenames for PCI Vendor and Device IDs */
#define PCI_VENDOR_ID_PATH "/sys/bus/pci/devices/0000:00:00.0/vendor"
#define PCI_DEVICE_ID_PATH "/sys/bus/pci/devices/0000:00:00.0/device"
typedef struct PlatformFamily {
unsigned int vendor; /* Vendor id value */
unsigned int device; /* Device id value */
const char* platform_string; /* String to return */
} PlatformFamily;
/* Array of platform family names, terminated with a NULL entry */
const PlatformFamily platform_family_array[] = {
{0x8086, 0xA010, "PineTrail"},
{0x8086, 0x3406, "Westmere"},
{0x8086, 0x0104, "SandyBridge"}, /* mobile */
{0x8086, 0x0100, "SandyBridge"}, /* desktop */
{0x8086, 0x0154, "IvyBridge"}, /* mobile */
{0x8086, 0x0150, "IvyBridge"}, /* desktop */
{0x8086, 0x0a04, "Haswell"}, /* ult */
{0x8086, 0x0c04, "Haswell"}, /* mobile */
{0x8086, 0x0f00, "BayTrail"}, /* mobile */
{0x8086, 0x1604, "Broadwell"}, /* ult */
/* Terminate with NULL entry */
{0, 0, 0}
};
static void VbFixCmosChecksum(FILE* file) {
int fd = fileno(file);
ioctl(fd, NVRAM_SETCKS);
}
static int VbCmosRead(unsigned offs, size_t size, void *ptr) {
size_t res;
FILE* f;
f = fopen(NVRAM_PATH, "rb");
if (!f)
return -1;
if (0 != fseek(f, offs, SEEK_SET)) {
fclose(f);
return -1;
}
res = fread(ptr, size, 1, f);
if (1 != res && errno == EIO && ferror(f)) {
VbFixCmosChecksum(f);
res = fread(ptr, size, 1, f);
}
fclose(f);
return (1 == res) ? 0 : -1;
}
static int VbCmosWrite(unsigned offs, size_t size, const void *ptr) {
size_t res;
FILE* f;
f = fopen(NVRAM_PATH, "w+b");
if (!f)
return -1;
if (0 != fseek(f, offs, SEEK_SET)) {
fclose(f);
return -1;
}
res = fwrite(ptr, size, 1, f);
if (1 != res && errno == EIO && ferror(f)) {
VbFixCmosChecksum(f);
res = fwrite(ptr, size, 1, f);
}
fclose(f);
return (1 == res) ? 0 : -1;
}
int VbReadNvStorage(VbNvContext* vnc) {
unsigned offs, blksz;
/* Get the byte offset from VBNV */
if (ReadFileInt(ACPI_VBNV_PATH ".0", &offs) < 0)
return -1;
if (ReadFileInt(ACPI_VBNV_PATH ".1", &blksz) < 0)
return -1;
if (VBNV_BLOCK_SIZE > blksz)
return -1; /* NV storage block is too small */
if (0 != VbCmosRead(offs, VBNV_BLOCK_SIZE, vnc->raw))
return -1;
return 0;
}
int VbWriteNvStorage(VbNvContext* vnc) {
unsigned offs, blksz;
if (!vnc->raw_changed)
return 0; /* Nothing changed, so no need to write */
/* Get the byte offset from VBNV */
if (ReadFileInt(ACPI_VBNV_PATH ".0", &offs) < 0)
return -1;
if (ReadFileInt(ACPI_VBNV_PATH ".1", &blksz) < 0)
return -1;
if (VBNV_BLOCK_SIZE > blksz)
return -1; /* NV storage block is too small */
if (0 != VbCmosWrite(offs, VBNV_BLOCK_SIZE, vnc->raw))
return -1;
return 0;
}
/*
* Get buffer data from ACPI.
*
* Buffer data is expected to be represented by a file which is a text dump of
* the buffer, representing each byte by two hex numbers, space and newline
* separated.
*
* On success, stores the amount of data read in bytes to *buffer_size; on
* erros, sets *buffer_size=0.
*
* Input - ACPI file name to get data from.
*
* Output: a pointer to AcpiBuffer structure containing the binary
* representation of the data. The caller is responsible for
* deallocating the pointer, this will take care of both the structure
* and the buffer. Null in case of error.
*/
static uint8_t* VbGetBuffer(const char* filename, int* buffer_size) {
FILE* f = NULL;
char* file_buffer = NULL;
uint8_t* output_buffer = NULL;
uint8_t* return_value = NULL;
/* Assume error until proven otherwise */
if (buffer_size)
*buffer_size = 0;
do {
struct stat fs;
uint8_t* output_ptr;
int rv, i, real_size;
int parsed_size = 0;
rv = stat(filename, &fs);
if (rv || !S_ISREG(fs.st_mode))
break;
f = fopen(filename, "r");
if (!f)
break;
file_buffer = malloc(fs.st_size + 1);
if (!file_buffer)
break;
real_size = fread(file_buffer, 1, fs.st_size, f);
if (!real_size)
break;
file_buffer[real_size] = '\0';
/* Each byte in the output will replace two characters and a space
* in the input, so the output size does not exceed input side/3
* (a little less if account for newline characters). */
output_buffer = malloc(real_size/3);
if (!output_buffer)
break;
output_ptr = output_buffer;
/* process the file contents */
for (i = 0; i < real_size; i++) {
char* base, *end;
base = file_buffer + i;
if (!isxdigit(*base))
continue;
output_ptr[parsed_size++] = strtol(base, &end, 16) & 0xff;
if ((end - base) != 2)
/* Input file format error */
break;
i += 2; /* skip the second character and the following space */
}
if (i == real_size) {
/* all is well */
return_value = output_buffer;
output_buffer = NULL; /* prevent it from deallocating */
if (buffer_size)
*buffer_size = parsed_size;
}
} while(0);
/* wrap up */
if (f)
fclose(f);
if (file_buffer)
free(file_buffer);
if (output_buffer)
free(output_buffer);
return return_value;
}
VbSharedDataHeader* VbSharedDataRead(void) {
VbSharedDataHeader* sh;
int got_size = 0;
int expect_size;
sh = (VbSharedDataHeader*)VbGetBuffer(ACPI_VDAT_PATH, &got_size);
if (!sh)
return NULL;
/* Make sure the size is sufficient for the struct version we got.
* Check supported old versions first. */
if (1 == sh->struct_version)
expect_size = VB_SHARED_DATA_HEADER_SIZE_V1;
else {
/* There'd better be enough data for the current header size. */
expect_size = sizeof(VbSharedDataHeader);
}
if (got_size < expect_size) {
free(sh);
return NULL;
}
if (sh->data_size > got_size)
sh->data_size = got_size; /* Truncated read */
return sh;
}
/* Read the CMOS reboot field in NVRAM.
*
* Returns 0 if the mask is clear in the field, 1 if set, or -1 if error. */
static int VbGetCmosRebootField(uint8_t mask) {
unsigned chnv;
uint8_t nvbyte;
/* Get the byte offset from CHNV */
if (ReadFileInt(ACPI_CHNV_PATH, &chnv) < 0)
return -1;
if (0 != VbCmosRead(chnv, 1, &nvbyte))
return -1;
return (nvbyte & mask ? 1 : 0);
}
/* Write the CMOS reboot field in NVRAM.
*
* Sets (value=0) or clears (value!=0) the mask in the byte.
*
* Returns 0 if success, or -1 if error. */
static int VbSetCmosRebootField(uint8_t mask, int value) {
unsigned chnv;
uint8_t nvbyte;
/* Get the byte offset from CHNV */
if (ReadFileInt(ACPI_CHNV_PATH, &chnv) < 0)
return -1;
if (0 != VbCmosRead(chnv, 1, &nvbyte))
return -1;
/* Set/clear the mask */
if (value)
nvbyte |= mask;
else
nvbyte &= ~mask;
/* Write the byte back */
if (0 != VbCmosWrite(chnv, 1, &nvbyte))
return -1;
/* Success */
return 0;
}
/* Read the active main firmware type into the destination buffer.
* Passed the destination and its size. Returns the destination, or
* NULL if error. */
static const char* VbReadMainFwType(char* dest, int size) {
unsigned value;
/* Try reading type from BINF.3 */
if (ReadFileInt(ACPI_BINF_PATH ".3", &value) == 0) {
switch(value) {
case BINF3_NETBOOT:
return StrCopy(dest, "netboot", size);
case BINF3_RECOVERY:
return StrCopy(dest, "recovery", size);
case BINF3_NORMAL:
return StrCopy(dest, "normal", size);
case BINF3_DEVELOPER:
return StrCopy(dest, "developer", size);
default:
break; /* Fall through to legacy handling */
}
}
/* Fall back to BINF.0 for legacy systems like Mario. */
if (ReadFileInt(ACPI_BINF_PATH ".0", &value) < 0)
/* Both BINF.0 and BINF.3 are missing, so this isn't Chrome OS
* firmware. */
return StrCopy(dest, "nonchrome", size);
switch(value) {
case BINF0_NORMAL:
return StrCopy(dest, "normal", size);
case BINF0_DEVELOPER:
return StrCopy(dest, "developer", size);
case BINF0_RECOVERY_BUTTON:
case BINF0_RECOVERY_DEV_SCREEN_KEY:
case BINF0_RECOVERY_RW_FW_BAD:
case BINF0_RECOVERY_NO_OS:
case BINF0_RECOVERY_BAD_OS:
case BINF0_RECOVERY_OS_INITIATED:
case BINF0_RECOVERY_TPM_ERROR:
/* Assorted flavors of recovery boot reason. */
return StrCopy(dest, "recovery", size);
default:
/* Other values don't map cleanly to firmware type. */
return NULL;
}
}
/* Read the recovery reason. Returns the reason code or -1 if error. */
static int VbGetRecoveryReason(void) {
unsigned value;
/* Try reading type from BINF.4 */
if (ReadFileInt(ACPI_BINF_PATH ".4", &value) == 0)
return value;
/* Fall back to BINF.0 for legacy systems like Mario. */
if (ReadFileInt(ACPI_BINF_PATH ".0", &value) < 0)
return -1;
switch(value) {
case BINF0_NORMAL:
case BINF0_DEVELOPER:
return VBNV_RECOVERY_NOT_REQUESTED;
case BINF0_RECOVERY_BUTTON:
return VBNV_RECOVERY_RO_MANUAL;
case BINF0_RECOVERY_DEV_SCREEN_KEY:
return VBNV_RECOVERY_RW_DEV_SCREEN;
case BINF0_RECOVERY_RW_FW_BAD:
return VBNV_RECOVERY_RO_INVALID_RW;
case BINF0_RECOVERY_NO_OS:
return VBNV_RECOVERY_RW_NO_OS;
case BINF0_RECOVERY_BAD_OS:
return VBNV_RECOVERY_RW_INVALID_OS;
case BINF0_RECOVERY_OS_INITIATED:
return VBNV_RECOVERY_LEGACY;
default:
/* Other values don't map cleanly to firmware type. */
return -1;
}
}
/* Determine the platform family and return it in the dest string.
* This uses the PCI Bus 0, Device 0, Function 0 vendor and device id values
* taken from sysfs to determine the platform family. This assumes there will
* be a unique pair of values here for any given platform.
*/
static char* ReadPlatformFamilyString(char* dest, int size) {
FILE* f;
const PlatformFamily* p;
unsigned int v = 0xFFFF;
unsigned int d = 0xFFFF;
f = fopen(PCI_VENDOR_ID_PATH, "rt");
if (!f)
return NULL;
if(fscanf(f, "0x%4x", &v) != 1)
return NULL;
fclose(f);
f = fopen(PCI_DEVICE_ID_PATH, "rt");
if (!f)
return NULL;
if(fscanf(f, "0x%4x", &d) != 1)
return NULL;
fclose(f);
for (p = platform_family_array; p->vendor; p++) {
if((v == p->vendor) && (d == p->device))
return StrCopy(dest, p->platform_string, size);
}
/* No recognized platform family was found */
return NULL;
}
/* Physical GPIO number <N> may be accessed through /sys/class/gpio/gpio<M>/,
* but <N> and <M> may differ by some offset <O>. To determine that constant,
* we look for a directory named /sys/class/gpio/gpiochip<O>/. If there's not
* exactly one match for that, we're SOL.
*/
static int FindGpioChipOffset(unsigned *gpio_num, unsigned *offset,
const char *name) {
DIR *dir;
struct dirent *ent;
int match = 0;
dir = opendir(GPIO_BASE_PATH);
if (!dir) {
return 0;
}
while(0 != (ent = readdir(dir))) {
if (1 == sscanf(ent->d_name, "gpiochip%u", offset)) {
match++;
}
}
closedir(dir);
return (1 == match);
}
/* Physical GPIO number <N> may be accessed through /sys/class/gpio/gpio<M>/,
* but <N> and <M> may differ by some offset <O>. To determine that constant,
* we look for a directory named /sys/class/gpio/gpiochip<O>/ and check for
* a 'label' file inside of it to find the expected the controller name.
*/
static int FindGpioChipOffsetByLabel(unsigned *gpio_num, unsigned *offset,
const char *name) {
DIR *dir;
struct dirent *ent;
char filename[128];
char chiplabel[128];
int match = 0;
dir = opendir(GPIO_BASE_PATH);
if (!dir) {
return 0;
}
while(0 != (ent = readdir(dir))) {
if (1 == sscanf(ent->d_name, "gpiochip%u", offset)) {
/*
* Read the file at gpiochip<O>/label to get the identifier
* for this bank of GPIOs.
*/
snprintf(filename, sizeof(filename), "%s/gpiochip%u/label",
GPIO_BASE_PATH, *offset);
if (ReadFileString(chiplabel, sizeof(chiplabel), filename)) {
if (!strncasecmp(chiplabel, name, strlen(name)))
match++;
}
}
}
closedir(dir);
return (1 == match);
}
/* BayTrail has 3 sets of GPIO banks. It is expected the firmware exposes
* each bank of gpios using a UID in ACPI. Furthermore the gpio number exposed
* is relative to the bank. e.g. gpio 6 in the bank specified by UID 3 would
* be encoded as 0x2006.
* UID | Bank Offset
* ----+------------
* 1 | 0x0000
* 2 | 0x1000
* 3 | 0x2000
*/
static int BayTrailFindGpioChipOffset(unsigned *gpio_num, unsigned *offset,
const char *name) {
DIR *dir;
struct dirent *ent;
unsigned expected_uid;
int match = 0;
/* Obtain relative GPIO number. */
if (*gpio_num >= 0x2000) {
*gpio_num -= 0x2000;
expected_uid = 3;
} else if (*gpio_num >= 0x1000) {
*gpio_num -= 0x1000;
expected_uid = 2;
} else if (*gpio_num >= 0x0000) {
*gpio_num -= 0x0000;
expected_uid = 1;
} else {
return 0;
}
dir = opendir(GPIO_BASE_PATH);
if (!dir) {
return 0;
}
while(0 != (ent = readdir(dir))) {
/* For every gpiochip entry determine uid. */
if (1 == sscanf(ent->d_name, "gpiochip%u", offset)) {
char uid_file[128];
unsigned uid_value;
snprintf(uid_file, sizeof(uid_file),
"%s/gpiochip%u/device/firmware_node/uid", GPIO_BASE_PATH,
*offset);
if (ReadFileInt(uid_file, &uid_value) < 0)
continue;
if (expected_uid == uid_value) {
match++;
break;
}
}
}
closedir(dir);
return (1 == match);
}
struct GpioChipset {
const char *name;
int (*ChipOffsetAndGpioNumber)(unsigned *gpio_num, unsigned *chip_offset,
const char *name);
};
static const struct GpioChipset chipsets_supported[] = {
{ "NM10", FindGpioChipOffset },
{ "CougarPoint", FindGpioChipOffset },
{ "PantherPoint", FindGpioChipOffset },
{ "LynxPoint", FindGpioChipOffset },
{ "PCH-LP", FindGpioChipOffset },
{ "INT3437:00", FindGpioChipOffsetByLabel },
{ "BayTrail", BayTrailFindGpioChipOffset },
{ NULL },
};
static const struct GpioChipset *FindChipset(const char *name) {
const struct GpioChipset *chipset = &chipsets_supported[0];
while (chipset->name != NULL) {
if (!strcmp(name, chipset->name))
return chipset;
chipset++;
}
return NULL;
}
/* Read a GPIO of the specified signal type (see ACPI GPIO SignalType).
*
* Returns 1 if the signal is asserted, 0 if not asserted, or -1 if error. */
static int ReadGpio(unsigned signal_type) {
char name[128];
int index = 0;
unsigned gpio_type;
unsigned active_high;
unsigned controller_num;
unsigned controller_offset = 0;
char controller_name[128];
unsigned value;
const struct GpioChipset *chipset;
/* Scan GPIO.* to find a matching signal type */
for (index = 0; ; index++) {
snprintf(name, sizeof(name), "%s.%d/GPIO.0", ACPI_GPIO_PATH, index);
if (ReadFileInt(name, &gpio_type) < 0)
return -1; /* Ran out of GPIOs before finding a match */
if (gpio_type == signal_type)
break;
}
/* Read attributes and controller info for the GPIO */
snprintf(name, sizeof(name), "%s.%d/GPIO.1", ACPI_GPIO_PATH, index);
if (ReadFileInt(name, &active_high) < 0)
return -1;
snprintf(name, sizeof(name), "%s.%d/GPIO.2", ACPI_GPIO_PATH, index);
if (ReadFileInt(name, &controller_num) < 0)
return -1;
/* Do not attempt to read GPIO that is set to -1 in ACPI */
if (controller_num == 0xFFFFFFFF)
return -1;
/* Check for chipsets we recognize. */
snprintf(name, sizeof(name), "%s.%d/GPIO.3", ACPI_GPIO_PATH, index);
if (!ReadFileString(controller_name, sizeof(controller_name), name))
return -1;
chipset = FindChipset(controller_name);
if (chipset == NULL)
return -1;
/* Modify GPIO number by driver's offset */
if (!chipset->ChipOffsetAndGpioNumber(&controller_num, &controller_offset,
chipset->name))
return -1;
controller_offset += controller_num;
/* Try reading the GPIO value */
snprintf(name, sizeof(name), "%s/gpio%d/value",
GPIO_BASE_PATH, controller_offset);
if (ReadFileInt(name, &value) < 0) {
/* Try exporting the GPIO */
FILE* f = fopen(GPIO_EXPORT_PATH, "wt");
if (!f)
return -1;
fprintf(f, "%u", controller_offset);
fclose(f);
/* Try re-reading the GPIO value */
if (ReadFileInt(name, &value) < 0)
return -1;
}
/* Normalize the value read from the kernel in case it is not always 1. */
value = value ? 1 : 0;
/* Compare the GPIO value with the active value and return 1 if match. */
return (value == active_high ? 1 : 0);
}
int VbGetArchPropertyInt(const char* name) {
int value = -1;
/* Values from ACPI */
if (!strcasecmp(name,"fmap_base")) {
unsigned fmap_base;
if (ReadFileInt(ACPI_FMAP_PATH, &fmap_base) < 0)
return -1;
else
value = (int)fmap_base;
}
/* Switch positions */
if (!strcasecmp(name,"devsw_cur")) {
/* Systems with virtual developer switches return at-boot value */
int flags = VbGetSystemPropertyInt("vdat_flags");
if ((flags != -1) && (flags & VBSD_HONOR_VIRT_DEV_SWITCH))
value = VbGetSystemPropertyInt("devsw_boot");
else
value = ReadGpio(GPIO_SIGNAL_TYPE_DEV);
} else if (!strcasecmp(name,"recoverysw_cur")) {
value = ReadGpio(GPIO_SIGNAL_TYPE_RECOVERY);
} else if (!strcasecmp(name,"wpsw_cur")) {
value = ReadGpio(GPIO_SIGNAL_TYPE_WP);
if (-1 != value && FwidStartsWith("Mario."))
value = 1 - value; /* Mario reports this backwards */
} else if (!strcasecmp(name,"recoverysw_ec_boot")) {
value = ReadFileBit(ACPI_CHSW_PATH, CHSW_RECOVERY_EC_BOOT);
}
/* Fields for old systems which don't have VbSharedData */
if (VbSharedDataVersion() < 2) {
if (!strcasecmp(name,"recovery_reason")) {
value = VbGetRecoveryReason();
} else if (!strcasecmp(name,"devsw_boot")) {
value = ReadFileBit(ACPI_CHSW_PATH, CHSW_DEV_BOOT);
} else if (!strcasecmp(name,"recoverysw_boot")) {
value = ReadFileBit(ACPI_CHSW_PATH, CHSW_RECOVERY_BOOT);
} else if (!strcasecmp(name,"wpsw_boot")) {
value = ReadFileBit(ACPI_CHSW_PATH, CHSW_WP_BOOT);
if (-1 != value && FwidStartsWith("Mario."))
value = 1 - value; /* Mario reports this backwards */
}
}
/* Saved memory is at a fixed location for all H2C BIOS. If the CHSW
* path exists in sysfs, it's a H2C BIOS. */
if (!strcasecmp(name,"savedmem_base")) {
unsigned savedmem_base;
if (ReadFileInt(ACPI_CHSW_PATH, &savedmem_base) < 0)
return -1;
else
return 0x00F00000;
} else if (!strcasecmp(name,"savedmem_size")) {
unsigned savedmem_size;
if (ReadFileInt(ACPI_CHSW_PATH, &savedmem_size) < 0)
return -1;
else
return 0x00100000;
}
/* NV storage values. If unable to get from NV storage, fall back to the
* CMOS reboot field used by older BIOS (e.g. Mario). */
if (!strcasecmp(name,"recovery_request")) {
value = VbGetNvStorage(VBNV_RECOVERY_REQUEST);
if (-1 == value)
value = VbGetCmosRebootField(CMOSRF_RECOVERY);
} else if (!strcasecmp(name,"dbg_reset")) {
value = VbGetNvStorage(VBNV_DEBUG_RESET_MODE);
if (-1 == value)
value = VbGetCmosRebootField(CMOSRF_DEBUG_RESET);
} else if (!strcasecmp(name,"fwb_tries")) {
value = VbGetNvStorage(VBNV_TRY_B_COUNT);
if (-1 == value)
value = VbGetCmosRebootField(CMOSRF_TRY_B);
}
/* Firmware update tries is now stored in the kernel field. On
* older systems where it's not, it was stored in a file in the
* stateful partition. */
if (!strcasecmp(name,"fwupdate_tries")) {
unsigned fwupdate_value;
if (-1 != VbGetNvStorage(VBNV_KERNEL_FIELD))
return -1; /* NvStorage supported; fail through arch-specific
* implementation to normal implementation. */
/* Read value from file; missing file means value=0. */
if (ReadFileInt(NEED_FWUPDATE_PATH, &fwupdate_value) < 0)
value = 0;
else
value = (int)fwupdate_value;
}
return value;
}
const char* VbGetArchPropertyString(const char* name, char* dest,
size_t size) {
unsigned value;
if (!strcasecmp(name,"arch")) {
return StrCopy(dest, "x86", size);
} else if (!strcasecmp(name,"hwid")) {
return ReadFileString(dest, size, ACPI_BASE_PATH "/HWID");
} else if (!strcasecmp(name,"fwid")) {
return ReadFileString(dest, size, ACPI_BASE_PATH "/FWID");
} else if (!strcasecmp(name,"ro_fwid")) {
return ReadFileString(dest, size, ACPI_BASE_PATH "/FRID");
} else if (!strcasecmp(name,"mainfw_act")) {
if (ReadFileInt(ACPI_BINF_PATH ".1", &value) < 0)
return NULL;
switch(value) {
case 0:
return StrCopy(dest, "recovery", size);
case 1:
return StrCopy(dest, "A", size);
case 2:
return StrCopy(dest, "B", size);
default:
return NULL;
}
} else if (!strcasecmp(name,"mainfw_type")) {
return VbReadMainFwType(dest, size);
} else if (!strcasecmp(name,"ecfw_act")) {
if (ReadFileInt(ACPI_BINF_PATH ".2", &value) < 0)
return NULL;
switch(value) {
case 0:
return StrCopy(dest, "RO", size);
case 1:
return StrCopy(dest, "RW", size);
default:
return NULL;
}
} else if (!strcasecmp(name,"platform_family")) {
return ReadPlatformFamilyString(dest, size);
}
return NULL;
}
int VbSetArchPropertyInt(const char* name, int value) {
/* NV storage values. If unable to get from NV storage, fall back to the
* CMOS reboot field used by older BIOS. */
if (!strcasecmp(name,"recovery_request")) {
if (0 == VbSetNvStorage(VBNV_RECOVERY_REQUEST, value))
return 0;
return VbSetCmosRebootField(CMOSRF_RECOVERY, value);
} else if (!strcasecmp(name,"dbg_reset")) {
if (0 == VbSetNvStorage(VBNV_DEBUG_RESET_MODE, value))
return 0;
return VbSetCmosRebootField(CMOSRF_DEBUG_RESET, value);
} else if (!strcasecmp(name,"fwb_tries")) {
if (0 == VbSetNvStorage(VBNV_TRY_B_COUNT, value))
return 0;
return VbSetCmosRebootField(CMOSRF_TRY_B, value);
}
/* Firmware update tries is now stored in the kernel field. On
* older systems where it's not, it was stored in a file in the
* stateful partition. */
else if (!strcasecmp(name,"fwupdate_tries")) {
if (-1 != VbGetNvStorage(VBNV_KERNEL_FIELD))
return -1; /* NvStorage supported; fail through arch-specific
* implementation to normal implementation */
if (value) {
char buf[32];
snprintf(buf, sizeof(buf), "%d", value);
return WriteFile(NEED_FWUPDATE_PATH, buf, strlen(buf));
} else {
/* No update tries, so remove file if it exists. */
unlink(NEED_FWUPDATE_PATH);
return 0;
}
}
return -1;
}
int VbSetArchPropertyString(const char* name, const char* value) {
/* If there were settable architecture-dependent string properties,
* they'd be here. */
return -1;
}
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