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-rw-r--r--src/vboot/Kconfig3
-rw-r--r--src/vboot/vbnv_flash.c82
2 files changed, 16 insertions, 69 deletions
diff --git a/src/vboot/Kconfig b/src/vboot/Kconfig
index 08381677e3..f3df7c524b 100644
--- a/src/vboot/Kconfig
+++ b/src/vboot/Kconfig
@@ -29,7 +29,7 @@ config VBOOT_VBNV_CMOS
config VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
bool "Back up Vboot non-volatile storage from CMOS to flash."
default n
- depends on VBOOT_VBNV_CMOS
+ depends on VBOOT_VBNV_CMOS && BOOT_DEVICE_SUPPORTS_WRITES
help
Vboot non-volatile storage data will be backed up from CMOS to flash
and restored from flash if the CMOS is invalid due to power loss.
@@ -42,6 +42,7 @@ config VBOOT_VBNV_EC
config VBOOT_VBNV_FLASH
def_bool n
+ depends on BOOT_DEVICE_SUPPORTS_WRITES
help
VBNV is stored in flash storage
diff --git a/src/vboot/vbnv_flash.c b/src/vboot/vbnv_flash.c
index 717ff23819..d061228a2a 100644
--- a/src/vboot/vbnv_flash.c
+++ b/src/vboot/vbnv_flash.c
@@ -17,7 +17,6 @@
#include <assert.h>
#include <commonlib/region.h>
#include <console/console.h>
-#include <spi_flash.h>
#include <string.h>
#include <vb2_api.h>
#include <vboot_nvstorage.h>
@@ -31,17 +30,14 @@ struct vbnv_flash_ctx {
/* VBNV flash is initialized */
int initialized;
- /* Offset of the current nvdata in SPI flash */
+ /* Offset of the current nvdata in flash */
int blob_offset;
- /* Offset of the topmost nvdata blob in SPI flash */
+ /* Offset of the topmost nvdata blob in flash */
int top_offset;
- /* SPI flash handler used when saving data */
- struct spi_flash *flash;
-
- /* FMAP descriptor of the NVRAM area */
- struct region_device region;
+ /* Region to store and retrieve the VBNV contents. */
+ struct region_device vbnv_dev;
/* Cache of the current nvdata */
uint8_t cache[BLOB_SIZE];
@@ -66,13 +62,14 @@ static inline int can_overwrite(uint8_t current, uint8_t new)
static int init_vbnv(void)
{
struct vbnv_flash_ctx *ctx = car_get_var_ptr(&vbnv_flash);
+ struct region_device *rdev = &ctx->vbnv_dev;
uint8_t buf[BLOB_SIZE];
uint8_t empty_blob[BLOB_SIZE];
int offset;
int i;
- if (vboot_named_region_device("RW_NVRAM", &ctx->region) ||
- region_device_sz(&ctx->region) < BLOB_SIZE) {
+ if (vboot_named_region_device_rw("RW_NVRAM", rdev) ||
+ region_device_sz(rdev) < BLOB_SIZE) {
printk(BIOS_ERR, "%s: failed to locate NVRAM\n", __func__);
return 1;
}
@@ -82,7 +79,7 @@ static int init_vbnv(void)
empty_blob[i] = erase_value();
offset = 0;
- ctx->top_offset = region_device_sz(&ctx->region) - BLOB_SIZE;
+ ctx->top_offset = region_device_sz(rdev) - BLOB_SIZE;
/*
* after the loop, offset is supposed to point the blob right before
@@ -91,7 +88,7 @@ static int init_vbnv(void)
* used.
*/
for (i = 0; i <= ctx->top_offset; i += BLOB_SIZE) {
- if (rdev_readat(&ctx->region, buf, i, BLOB_SIZE) < 0) {
+ if (rdev_readat(rdev, buf, i, BLOB_SIZE) < 0) {
printk(BIOS_ERR, "failed to read nvdata\n");
return 1;
}
@@ -101,7 +98,7 @@ static int init_vbnv(void)
}
/* reread the nvdata and write it to the cache */
- if (rdev_readat(&ctx->region, ctx->cache, offset, BLOB_SIZE) < 0) {
+ if (rdev_readat(rdev, ctx->cache, offset, BLOB_SIZE) < 0) {
printk(BIOS_ERR, "failed to read nvdata\n");
return 1;
}
@@ -112,61 +109,12 @@ static int init_vbnv(void)
return 0;
}
-static void vbnv_is_erasable(void)
-{
- /*
- * We check whether the region is aligned or not in advance to ensure
- * we can erase the region when it's all used up.
- *
- * The region offset & size are determined by fmap.dts yet the check can
- * be confidently done only by the spi flash driver. We use the same
- * check as the one used by spi_flash_cmd_erase, which happens to be
- * common to all the spi flash parts we support.
- *
- * TODO: Check by calling can_erase implemented by each spi flash driver
- */
- struct vbnv_flash_ctx *ctx = car_get_var_ptr(&vbnv_flash);
-
- assert(!(region_device_offset(&ctx->region) % ctx->flash->sector_size));
- assert(!(region_device_sz(&ctx->region) % ctx->flash->sector_size));
-}
-
-static int vbnv_flash_probe(void)
-{
- struct vbnv_flash_ctx *ctx = car_get_var_ptr(&vbnv_flash);
-
- if (!ctx->flash) {
- ctx->flash =
- spi_flash_probe(CONFIG_BOOT_DEVICE_SPI_FLASH_BUS, 0);
- if (!ctx->flash) {
- printk(BIOS_ERR, "failed to probe spi flash\n");
- return 1;
- }
- /*
- * Called here instead of init_vbnv to reduce impact on boot
- * speed.
- */
- vbnv_is_erasable();
- }
-
- /*
- * Handle the case where spi_flash_probe returns a CAR_GLOBAL
- * in early execution on x86 but then later is moved to RAM.
- */
- ctx->flash = car_get_var_ptr(ctx->flash);
-
- return 0;
-}
-
static int erase_nvram(void)
{
struct vbnv_flash_ctx *ctx = car_get_var_ptr(&vbnv_flash);
+ const struct region_device *rdev = &ctx->vbnv_dev;
- if (vbnv_flash_probe())
- return 1;
-
- if (ctx->flash->erase(ctx->flash, region_device_offset(&ctx->region),
- region_device_sz(&ctx->region))) {
+ if (rdev_eraseat(rdev, 0, region_device_sz(rdev)) < 0) {
printk(BIOS_ERR, "failed to erase nvram\n");
return 1;
}
@@ -191,6 +139,7 @@ void save_vbnv_flash(const uint8_t *vbnv_copy)
struct vbnv_flash_ctx *ctx = car_get_var_ptr(&vbnv_flash);
int new_offset;
int i;
+ const struct region_device *rdev = &ctx->vbnv_dev;
if (!ctx->initialized)
if (init_vbnv())
@@ -216,10 +165,7 @@ void save_vbnv_flash(const uint8_t *vbnv_copy)
}
}
- if (!vbnv_flash_probe() &&
- !ctx->flash->write(ctx->flash,
- region_device_offset(&ctx->region) + new_offset,
- BLOB_SIZE, vbnv_copy)) {
+ if (rdev_writeat(rdev, vbnv_copy, new_offset, BLOB_SIZE) < 0) {
/* write was successful. safely move pointer forward */
ctx->blob_offset = new_offset;
memcpy(ctx->cache, vbnv_copy, BLOB_SIZE);