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24a70738b2
manage_extensions_nonsecure() is problematic because it updates both context and in-place registers (unlike its secure/realm counterparts). The in-place register updates make it particularly tricky, as those never change for the lifetime of TF-A. However, they are only set when exiting to NS world. As such, all of TF-A's execution before that operates under a different context. This is inconsistent and could cause problems. This patch Introduce a real manage_extensions_nonsecure() which only operates on the context structure. It also introduces a cm_manage_extensions_el3() which only operates on register in-place that are not context switched. It is called in BL31's entrypoints so that all of TF-A executes with the same environment once all features have been converted. Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com> Change-Id: Ic579f86c41026d2054863ef44893e0ba4c591da9
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/*
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* Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef CONTEXT_MGMT_H
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#define CONTEXT_MGMT_H
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#include <assert.h>
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#include <context.h>
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#include <stdint.h>
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#include <arch.h>
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/*******************************************************************************
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* Forward declarations
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******************************************************************************/
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struct entry_point_info;
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/*******************************************************************************
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* Function & variable prototypes
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******************************************************************************/
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void cm_init(void);
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void *cm_get_context_by_index(unsigned int cpu_idx,
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unsigned int security_state);
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void cm_set_context_by_index(unsigned int cpu_idx,
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void *context,
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unsigned int security_state);
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void *cm_get_context(uint32_t security_state);
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void cm_set_context(void *context, uint32_t security_state);
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void cm_init_my_context(const struct entry_point_info *ep);
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void cm_init_context_by_index(unsigned int cpu_idx,
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const struct entry_point_info *ep);
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void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep);
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void cm_prepare_el3_exit(uint32_t security_state);
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void cm_prepare_el3_exit_ns(void);
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#ifdef __aarch64__
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#if IMAGE_BL31
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void cm_manage_extensions_el3(void);
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#endif
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#if CTX_INCLUDE_EL2_REGS
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void cm_el2_sysregs_context_save(uint32_t security_state);
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void cm_el2_sysregs_context_restore(uint32_t security_state);
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#endif
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void cm_el1_sysregs_context_save(uint32_t security_state);
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void cm_el1_sysregs_context_restore(uint32_t security_state);
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void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint);
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void cm_set_elr_spsr_el3(uint32_t security_state,
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uintptr_t entrypoint, uint32_t spsr);
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void cm_write_scr_el3_bit(uint32_t security_state,
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uint32_t bit_pos,
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uint32_t value);
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void cm_set_next_eret_context(uint32_t security_state);
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u_register_t cm_get_scr_el3(uint32_t security_state);
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/* Inline definitions */
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/*******************************************************************************
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* This function is used to program the context that's used for exception
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* return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for
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* the required security state
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******************************************************************************/
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static inline void cm_set_next_context(void *context)
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{
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#if ENABLE_ASSERTIONS
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uint64_t sp_mode;
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/*
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* Check that this function is called with SP_EL0 as the stack
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* pointer
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*/
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__asm__ volatile("mrs %0, SPSel\n"
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: "=r" (sp_mode));
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assert(sp_mode == MODE_SP_EL0);
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#endif /* ENABLE_ASSERTIONS */
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__asm__ volatile("msr spsel, #1\n"
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"mov sp, %0\n"
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"msr spsel, #0\n"
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: : "r" (context));
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}
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#else
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void *cm_get_next_context(void);
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void cm_set_next_context(void *context);
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static inline void cm_manage_extensions_el3(void) {}
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#endif /* __aarch64__ */
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#endif /* CONTEXT_MGMT_H */
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