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subsys: dfu: boot: Allow inspection of boot state.

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Exposes the operation that MCUboot will perform on the next reboot
(e.g., stay on current image, swap to alternate image, etc.).

Signed-off-by: Christopher Collins <ccollins@apache.org>
This commit is contained in:
Christopher Collins 2018-01-17 17:40:36 -08:00 • committed by Carles Cufí
commit 7b27fa6d5a
2 changed files with 173 additions and 2 deletions
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152
subsys/dfu/boot/mcuboot.c
View file

@ -5,6 +5,7 @@
* SPDX-License-Identifier: Apache-2.0
*/
#include <assert.h>
#include <stddef.h>
#include <errno.h>
#include <string.h>
@ -82,13 +83,87 @@ struct mcuboot_v1_raw_header {
BOOT_MAX_ALIGN)
#define MAGIC_OFFS(bank_offs) (bank_offs + FLASH_BANK_SIZE - BOOT_MAGIC_SZ)
const u32_t boot_img_magic[4] = {
static const u32_t boot_img_magic[4] = {
0xf395c277,
0x7fefd260,
0x0f505235,
0x8079b62c,
};
struct boot_swap_table {
/** * For each field, a value of 0 means "any". */
u8_t magic_slot0;
u8_t magic_slot1;
u8_t image_ok_slot0;
u8_t image_ok_slot1;
u8_t copy_done_slot0;
u8_t swap_type;
};
/** Represents the management state of a single image slot. */
struct boot_swap_state {
u8_t magic; /* One of the BOOT_MAGIC_[...] values. */
u8_t copy_done;
u8_t image_ok;
};
/**
* This set of tables maps image trailer contents to swap operation type.
* When searching for a match, these tables must be iterated sequentially.
*/
static const struct boot_swap_table boot_swap_tables[] = {
{
/* | slot-0 | slot-1 |
*----------+------------+------------|
* magic | Any | Good |
* image-ok | Any | Unset |
* ---------+------------+------------+
* swap: test |
* -----------------------------------'
*/
.magic_slot0 = 0,
.magic_slot1 = BOOT_MAGIC_GOOD,
.image_ok_slot0 = 0,
.image_ok_slot1 = 0xff,
.copy_done_slot0 = 0,
.swap_type = BOOT_SWAP_TYPE_TEST,
},
{
/* | slot-0 | slot-1 |
*----------+------------+------------|
* magic | Any | Good |
* image-ok | Any | 0x01 |
* ---------+------------+------------+
* swap: permanent |
* -----------------------------------'
*/
.magic_slot0 = 0,
.magic_slot1 = BOOT_MAGIC_GOOD,
.image_ok_slot0 = 0,
.image_ok_slot1 = 0x01,
.copy_done_slot0 = 0,
.swap_type = BOOT_SWAP_TYPE_PERM,
},
{
/* | slot-0 | slot-1 |
*----------+------------+------------|
* magic | Good | Unset |
* image-ok | Unset | Any |
* ---------+------------+------------+
* swap: revert (test image running) |
* -----------------------------------'
*/
.magic_slot0 = BOOT_MAGIC_GOOD,
.magic_slot1 = BOOT_MAGIC_UNSET,
.image_ok_slot0 = 0xff,
.image_ok_slot1 = 0,
.copy_done_slot0 = 0x01,
.swap_type = BOOT_SWAP_TYPE_REVERT,
},
};
#define BOOT_SWAP_TABLES_COUNT (ARRAY_SIZE(boot_swap_tables))
static struct device *flash_dev;
static int boot_flag_offs(int flag, u32_t bank_offs, u32_t *offs)
@ -105,7 +180,6 @@ static int boot_flag_offs(int flag, u32_t bank_offs, u32_t *offs)
}
}
static int boot_flash_write(off_t offs, const void *data, size_t len)
{
int rc;
@ -173,6 +247,11 @@ static int boot_image_ok_write(u32_t bank_offs)
return boot_flag_write(BOOT_FLAG_IMAGE_OK, bank_offs);
}
static int boot_copy_done_read(u32_t bank_offs)
{
return boot_flag_read(BOOT_FLAG_COPY_DONE, bank_offs);
}
static int boot_magic_write(u32_t bank_offs)
{
u32_t offs;
@ -265,6 +344,75 @@ int boot_read_bank_header(u32_t bank_offset,
return 0;
}
static int boot_read_swap_state(u32_t bank_offs, struct boot_swap_state *state)
{
int rc;
rc = boot_magic_state_read(bank_offs);
if (rc < 0) {
return rc;
}
state->magic = rc;
if (bank_offs != FLASH_AREA_IMAGE_SCRATCH_OFFSET) {
rc = boot_copy_done_read(bank_offs);
if (rc < 0) {
return rc;
}
state->copy_done = rc;
}
rc = boot_image_ok_read(bank_offs);
if (rc < 0) {
return rc;
}
state->image_ok = rc;
return 0;
}
int boot_swap_type(void)
{
const struct boot_swap_table *table;
struct boot_swap_state state_slot0;
struct boot_swap_state state_slot1;
int rc;
int i;
rc = boot_read_swap_state(FLASH_BANK0_OFFSET, &state_slot0);
if (rc != 0) {
return rc;
}
rc = boot_read_swap_state(FLASH_BANK1_OFFSET, &state_slot1);
if (rc != 0) {
return rc;
}
for (i = 0; i < BOOT_SWAP_TABLES_COUNT; i++) {
table = boot_swap_tables + i;
if ((table->magic_slot0 == 0 ||
table->magic_slot0 == state_slot0.magic) &&
(table->magic_slot1 == 0 ||
table->magic_slot1 == state_slot1.magic) &&
(table->image_ok_slot0 == 0 ||
table->image_ok_slot0 == state_slot0.image_ok) &&
(table->image_ok_slot1 == 0 ||
table->image_ok_slot1 == state_slot1.image_ok) &&
(table->copy_done_slot0 == 0 ||
table->copy_done_slot0 == state_slot0.copy_done)) {
assert(table->swap_type == BOOT_SWAP_TYPE_TEST ||
table->swap_type == BOOT_SWAP_TYPE_PERM ||
table->swap_type == BOOT_SWAP_TYPE_REVERT);
return table->swap_type;
}
}
return BOOT_SWAP_TYPE_NONE;
}
int boot_request_upgrade(int permanent)
{
int rc;