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exosphere: fix reentrancy of se interrupt handler

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This commit is contained in:
Michael Scire
2020-04-14 12:23:08 -07:00
parent d7ba3291ed
commit 7d30460214
2 changed files with 11 additions and 16 deletions
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19
exosphere/src/se.c
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@@ -52,19 +52,20 @@ void ll_init(volatile se_ll_t *ll, void *buffer, size_t size) {
}
void set_security_engine_callback(unsigned int (*callback)(void)) {
if (callback == NULL || g_se_callback != NULL) {
generic_panic();
}
/* Set the callback. */
g_se_callback = callback;
/* Enable SE Interrupt firing for async op. */
se_get_regs()->SE_INT_ENABLE = 0x10;
}
/* Fires on Security Engine operation completion. */
void se_operation_completed(void) {
se_get_regs()->SE_INT_ENABLE = 0;
if (g_se_callback != NULL) {
g_se_callback();
unsigned int (*callback)(void) = g_se_callback;
if (callback != NULL) {
g_se_callback = NULL;
callback();
}
}
@@ -304,9 +305,6 @@ void se_aes_crypt_insecure_internal(unsigned int keyslot, uint32_t out_ll_paddr,
/* Set the callback, for after the async operation. */
set_security_engine_callback(callback);
/* Enable SE Interrupt firing for async op. */
se->SE_INT_ENABLE = 0x10;
/* Setup Input/Output lists */
se->SE_IN_LL_ADDR = in_ll_paddr;
se->SE_OUT_LL_ADDR = out_ll_paddr;
@@ -358,9 +356,6 @@ void se_exp_mod(unsigned int keyslot, const void *buf, size_t size, unsigned int
set_security_engine_callback(callback);
/* Enable SE interrupt firing for async op. */
se->SE_INT_ENABLE = 0x10;
flush_dcache_range(stack_buf, stack_buf + KEYSIZE_RSA_MAX);
trigger_se_rsa_op(stack_buf, size);