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Code Issues Releases Activity

fusee: retry tsec key generation on failure.

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This commit is contained in:
Michael Scire 2018-12-07 14:54:06 -08:00
parent 4827fd71b4
commit 0ef3368893
1 changed files with 64 additions and 39 deletions
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103
fusee/fusee-secondary/src/smmu.c
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@ -20,6 +20,8 @@
#include "timers.h"
#include "tsec.h"
#define TSEC_KEYGEN_MAX_RETRIES 25
void *smmu_heap = (void *)SMMU_HEAP_BASE_ADDR;
static void safe_memcpy(void *dst, void *src, uint32_t sz) {
@ -168,14 +170,6 @@ void smmu_emulate_tsec(void *tsec_keys, const void *package1, size_t package1_si
/* Copy package1 into IRAM. */
memcpy((void *)0x40010000, package1, package1_size);
/* Load the TSEC firmware from IRAM. */
if (tsec_load_fw((void *)(0x40010000 + 0xE00), 0x2900) < 0) {
fatal_error("[SMMU]: Failed to load TSEC firmware!\n");
}
/* Disable the aperture since it has precedence over the SMMU. */
mc_disable_ahb_redirect();
/* Setup TSEC's address space. */
uint32_t *pdir = smmu_setup_tsec_as(1);
@ -189,21 +183,6 @@ void smmu_emulate_tsec(void *tsec_keys, const void *package1, size_t package1_si
volatile uint32_t *iram_pages = smmu_alloc_page(48);
volatile uint32_t *expv_page = smmu_alloc_page(1);
/* Copy CAR, MC and FUSE. */
safe_memcpy((void *)car_page, (void *)0x60006000, 0x1000);
safe_memcpy((void *)mc_page, (void *)0x70019000, 0x1000);
safe_memcpy((void *)&fuse_page[0x800/4], (void *)0x7000F800, 0x400);
/* Copy IRAM. */
memcpy((void *)iram_pages, (void *)0x40010000, 0x30000);
/* TSEC wants CLK_RST_CONTROLLER_CLK_SOURCE_TSEC_0 to be equal to 2. */
car_page[0x1F4/4] = 2;
/* TSEC wants the aperture fully open. */
mc_page[0x65C/4] = 0;
mc_page[0x660/4] = 0x80000000;
/* Map all necessary pages. */
smmu_map(pdir, 0x60006000, (uint32_t)car_page, 1, _READABLE | _WRITABLE | _NONSECURE);
smmu_map(pdir, 0x7000F000, (uint32_t)fuse_page, 1, _READABLE | _NONSECURE);
@ -217,20 +196,69 @@ void smmu_emulate_tsec(void *tsec_keys, const void *package1, size_t package1_si
/* Enable the SMMU. */
smmu_enable();
/* Run the TSEC firmware. */
tsec_run_fw();
/* Extract the keys from SE. */
/* Loop retrying TSEC firmware execution, in case we lose the SE keydata race. */
uint32_t key_buf[0x20/4] = {0};
volatile uint32_t *key_data = (volatile uint32_t *)((void *)se_page + 0x320);
uint32_t old_key_data = *key_data;
uint32_t buf_counter = 0;
while (!(tsec->FALCON_CPUCTL & 0x10)) {
const uint32_t new_key_data = *key_data;
if (new_key_data != old_key_data) {
old_key_data = new_key_data;
key_buf[buf_counter] = new_key_data;
buf_counter++;
unsigned int retries = 0;
while (true) {
if (retries++ > TSEC_KEYGEN_MAX_RETRIES) {
fatal_error("[SMMU] TSEC key generation race was lost too many times!");
}
/* Load the TSEC firmware from IRAM. */
if (tsec_load_fw((void *)(0x40010000 + 0xE00), 0x2900) < 0) {
fatal_error("[SMMU]: Failed to load TSEC firmware!\n");
}
/* Disable the aperture since it has precedence over the SMMU. */
mc_disable_ahb_redirect();
/* Clear all pages. */
memset((void *)car_page, 0, SMMU_PAGE_SIZE);
memset((void *)fuse_page, 0, SMMU_PAGE_SIZE);
memset((void *)pmc_page, 0, SMMU_PAGE_SIZE);
memset((void *)flow_page, 0, SMMU_PAGE_SIZE);
memset((void *)se_page, 0, SMMU_PAGE_SIZE);
memset((void *)mc_page, 0, SMMU_PAGE_SIZE);
memset((void *)iram_pages, 0, 48 * SMMU_PAGE_SIZE);
memset((void *)expv_page, 0, SMMU_PAGE_SIZE);
/* Copy CAR, MC and FUSE. */
safe_memcpy((void *)car_page, (void *)0x60006000, 0x1000);
safe_memcpy((void *)mc_page, (void *)0x70019000, 0x1000);
safe_memcpy((void *)&fuse_page[0x800/4], (void *)0x7000F800, 0x400);
/* Copy IRAM. */
memcpy((void *)iram_pages, (void *)0x40010000, 0x30000);
/* TSEC wants CLK_RST_CONTROLLER_CLK_SOURCE_TSEC_0 to be equal to 2. */
car_page[0x1F4/4] = 2;
/* TSEC wants the aperture fully open. */
mc_page[0x65C/4] = 0;
mc_page[0x660/4] = 0x80000000;
/* Run the TSEC firmware. */
tsec_run_fw();
/* Extract the keys from SE. */
volatile uint32_t *key_data = (volatile uint32_t *)((void *)se_page + 0x320);
uint32_t old_key_data = *key_data;
uint32_t buf_counter = 0;
while (!(tsec->FALCON_CPUCTL & 0x10)) {
const uint32_t new_key_data = *key_data;
if (new_key_data != old_key_data) {
old_key_data = new_key_data;
key_buf[buf_counter] = new_key_data;
buf_counter++;
}
}
/* Enable back the aperture. */
mc_enable_ahb_redirect();
if (buf_counter == 8) {
break;
}
}
@ -249,9 +277,6 @@ void smmu_emulate_tsec(void *tsec_keys, const void *package1, size_t package1_si
/* Clear TSEC's address space. */
smmu_clear_tsec_as(1);
/* Enable back the aperture. */
mc_enable_ahb_redirect();
/* Return the decrypted package1 from emulated IRAM. */
memcpy(package1_dec, (void *)iram_pages, package1_size);