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Code Issues Releases Wiki Activity

feat(core/unix): fill out (non-persistent) OTP functionality

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This commit is contained in:
matejcik 2023-03-23 14:52:35 +01:00
parent 9b8984896e
commit 497ead7111
1 changed files with 26 additions and 2 deletions
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28
core/embed/unix/flash.c
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@ -92,6 +92,11 @@ const uint8_t STORAGE_SECTORS[STORAGE_SECTORS_COUNT] = {
static uint8_t *FLASH_BUFFER = NULL; static uint8_t *FLASH_BUFFER = NULL;
static uint32_t FLASH_SIZE; static uint32_t FLASH_SIZE;
#define OTP_BLOCK_SIZE 32
#define FLASH_SECTOR_OTP (FLASH_SECTOR_COUNT)
static uint8_t OTP_BUFFER[OTP_BLOCK_SIZE * 64];
static void flash_exit(void) { static void flash_exit(void) {
int r = munmap(FLASH_BUFFER, FLASH_SIZE); int r = munmap(FLASH_BUFFER, FLASH_SIZE);
ensure(sectrue * (r == 0), "munmap failed"); ensure(sectrue * (r == 0), "munmap failed");
@ -130,6 +135,9 @@ void flash_init(void) {
FLASH_BUFFER = (uint8_t *)map; FLASH_BUFFER = (uint8_t *)map;
// fill OTP buffer with ones
memset(OTP_BUFFER, 0xFF, sizeof(OTP_BUFFER));
atexit(flash_exit); atexit(flash_exit);
} }
@ -203,12 +211,28 @@ secbool flash_write_word(uint8_t sector, uint32_t offset, uint32_t data) {
secbool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data, secbool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data,
uint8_t datalen) { uint8_t datalen) {
return secfalse; if (offset + datalen > OTP_BLOCK_SIZE) {
return secfalse;
}
uint32_t offset_in_sector = block * OTP_BLOCK_SIZE + offset;
memcpy(data, OTP_BUFFER + offset_in_sector, datalen);
return sectrue;
} }
secbool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data, secbool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data,
uint8_t datalen) { uint8_t datalen) {
return secfalse; if (offset + datalen > OTP_BLOCK_SIZE) {
return secfalse;
}
uint32_t offset_in_sector = block * OTP_BLOCK_SIZE + offset;
uint8_t *flash = OTP_BUFFER + offset_in_sector;
for (int i = 0; i < datalen; i++) {
if ((flash[i] & data[i]) != data[i]) {
return secfalse; // we cannot change zeroes to ones
}
flash[i] = data[i];
}
return sectrue;
} }
secbool flash_otp_lock(uint8_t block) { return secfalse; } secbool flash_otp_lock(uint8_t block) { return secfalse; }