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refactor(esp_tee): Remove explicit setting of the HP_CPU APM/TEE security mode

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This commit is contained in:
Laukik Hase 2025-02-06 17:32:32 +05:30
parent 26fa7109f3
commit 5c4a527750
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GPG Key ID: D6F3208C06086AC8
3 changed files with 15 additions and 27 deletions
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11
components/esp_tee/subproject/main/arch/riscv/esp_tee_secure_entry.S
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@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -15,21 +15,12 @@
.global _sec_world_entry
.type _sec_world_entry, @function
_sec_world_entry:
/* Setup the APM for HP CPU in TEE mode */
li t0, TEE_M0_MODE_CTRL_REG
sw zero, 0(t0) /* APM_LL_SECURE_MODE_TEE = 0 */
/* Disable the U-mode delegation of all interrupts */
csrwi mideleg, 0
/* Jump to the secure service dispatcher */
jal esp_tee_service_dispatcher
/* Setup the APM for HP CPU in REE mode */
li t0, TEE_M0_MODE_CTRL_REG
li t1, 0x1 /* APM_LL_SECURE_MODE_REE = 1 */
sw t1, 0(t0)
/* Enable the U-mode delegation of all interrupts (except the TEE secure interrupt) */
li t0, 0xffffbfff
csrw mideleg, t0

28
components/esp_tee/subproject/main/arch/riscv/esp_tee_vectors.S
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@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -177,15 +177,16 @@ _panic_handler:
addi sp, sp, -16
sw t0, 0(sp)
/* Check whether the exception is an M-mode ecall */
/* Read mcause */
csrr t0, mcause
xori t0, t0, ECALL_M_MODE
beqz t0, _machine_ecall
/* Check whether the exception is an M-mode ecall */
li t1, ECALL_M_MODE
beq t0, t1, _machine_ecall
/* Check whether the exception is an U-mode ecall */
csrr t0, mcause
xori t0, t0, ECALL_U_MODE
beqz t0, _user_ecall
li t1, ECALL_U_MODE
beq t0, t1, _user_ecall
/* Restore t0 from the stack */
lw t0, 0(sp)
@ -250,6 +251,10 @@ _return_from_exception:
_ecall_handler:
/* M-mode ecall handler */
_machine_ecall:
/* Set the privilege mode to transition to after mret to U-mode */
li t0, MSTATUS_MPP
csrc mstatus, t0
/* Check whether this is the first M-mode ecall (see esp_tee_init) and skip context restoration */
lui t0, ESP_TEE_M2U_SWITCH_MAGIC
beq a1, t0, _skip_ctx_restore
@ -267,15 +272,10 @@ _machine_ecall:
restore_general_regs RV_STK_FRMSZ
csrrw a0, mscratch, zero
/* This point is reached only after the first M-mode ecall, never again (see esp_tee_init) */
_skip_ctx_restore:
/* Copy the ra register to mepc which contains the user app entry point (i.e. call_start_cpu0) */
csrw mepc, ra
/* Set the privilege mode to transition to after mret to U-mode */
li t3, MSTATUS_MPP
csrc mstatus, t3
/* Jump to the REE */
mret
@ -291,8 +291,8 @@ _user_ecall:
lw t0, 0(sp)
addi sp, sp, 16
/* This point is reached after a secure service call is issued from the REE */
/* Save register context and the mepc */
/* This point is reached when a service call is issued from the REE */
/* Save register context and mepc */
save_general_regs RV_STK_FRMSZ
save_mepc

3
components/esp_tee/subproject/main/soc/esp32c6/esp_tee_secure_sys_cfg.c
View File

@ -100,9 +100,6 @@ void esp_tee_soc_secure_sys_init(void)
IRAM_ATTR inline void esp_tee_switch_to_ree(uint32_t ree_entry_addr)
{
/* Switch HP_CPU to REE0 mode. */
apm_tee_hal_set_master_secure_mode(HP_APM_CTRL, APM_LL_MASTER_HPCORE, APM_LL_SECURE_MODE_REE0);
/* 2nd argument is used as magic value to detect very first M2U switch */
/* TBD: clean this up and use proper temporary register instead of a1 */
/* Switch to non-secure world and launch App. */