1 /*
2 * Copyright (c) 2013-2023, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #ifndef CONTEXT_MGMT_H
8 #define CONTEXT_MGMT_H
9
10 #include <assert.h>
11 #include <context.h>
12 #include <stdint.h>
13
14 #include <arch.h>
15
16 /*******************************************************************************
17 * Forward declarations
18 ******************************************************************************/
19 struct entry_point_info;
20
21 /*******************************************************************************
22 * Function & variable prototypes
23 ******************************************************************************/
24 void cm_init(void);
25 void *cm_get_context_by_index(unsigned int cpu_idx,
26 unsigned int security_state);
27 void cm_set_context_by_index(unsigned int cpu_idx,
28 void *context,
29 unsigned int security_state);
30 void *cm_get_context(uint32_t security_state);
31 void cm_set_context(void *context, uint32_t security_state);
32 void cm_init_my_context(const struct entry_point_info *ep);
33 void cm_init_context_by_index(unsigned int cpu_idx,
34 const struct entry_point_info *ep);
35 void cm_setup_context(cpu_context_t *ctx, const struct entry_point_info *ep);
36 void cm_prepare_el3_exit(uint32_t security_state);
37 void cm_prepare_el3_exit_ns(void);
38
39 #ifdef __aarch64__
40 #if IMAGE_BL31
41 void cm_manage_extensions_el3(void);
42 void manage_extensions_nonsecure_per_world(void);
43 #endif
44 #if CTX_INCLUDE_EL2_REGS
45 void cm_el2_sysregs_context_save(uint32_t security_state);
46 void cm_el2_sysregs_context_restore(uint32_t security_state);
47 #endif
48
49 void cm_el1_sysregs_context_save(uint32_t security_state);
50 void cm_el1_sysregs_context_restore(uint32_t security_state);
51 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint);
52 void cm_set_elr_spsr_el3(uint32_t security_state,
53 uintptr_t entrypoint, uint32_t spsr);
54 void cm_write_scr_el3_bit(uint32_t security_state,
55 uint32_t bit_pos,
56 uint32_t value);
57 void cm_set_next_eret_context(uint32_t security_state);
58 u_register_t cm_get_scr_el3(uint32_t security_state);
59
60 /* Inline definitions */
61
62 /*******************************************************************************
63 * This function is used to program the context that's used for exception
64 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for
65 * the required security state
66 ******************************************************************************/
cm_set_next_context(void * context)67 static inline void cm_set_next_context(void *context)
68 {
69 #if ENABLE_ASSERTIONS
70 uint64_t sp_mode;
71
72 /*
73 * Check that this function is called with SP_EL0 as the stack
74 * pointer
75 */
76 __asm__ volatile("mrs %0, SPSel\n"
77 : "=r" (sp_mode));
78
79 assert(sp_mode == MODE_SP_EL0);
80 #endif /* ENABLE_ASSERTIONS */
81
82 __asm__ volatile("msr spsel, #1\n"
83 "mov sp, %0\n"
84 "msr spsel, #0\n"
85 : : "r" (context));
86 }
87
88 #else
89 void *cm_get_next_context(void);
90 void cm_set_next_context(void *context);
cm_manage_extensions_el3(void)91 static inline void cm_manage_extensions_el3(void) {}
manage_extensions_nonsecure_per_world(void)92 static inline void manage_extensions_nonsecure_per_world(void) {}
93 #endif /* __aarch64__ */
94
95 #endif /* CONTEXT_MGMT_H */
96