1 /*
2 * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #ifndef __CM_H__
8 #define __CM_H__
9
10 #ifndef AARCH32
11 #include <arch.h>
12 #include <assert.h>
13 #include <stdint.h>
14 #endif
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_prepare_el3_exit(uint32_t security_state);
36
37 #ifndef AARCH32
38 void cm_el1_sysregs_context_save(uint32_t security_state);
39 void cm_el1_sysregs_context_restore(uint32_t security_state);
40 void cm_set_elr_el3(uint32_t security_state, uintptr_t entrypoint);
41 void cm_set_elr_spsr_el3(uint32_t security_state,
42 uintptr_t entrypoint, uint32_t spsr);
43 void cm_write_scr_el3_bit(uint32_t security_state,
44 uint32_t bit_pos,
45 uint32_t value);
46 void cm_set_next_eret_context(uint32_t security_state);
47 uint32_t cm_get_scr_el3(uint32_t security_state);
48
49
50 void cm_init_context(uint64_t mpidr,
51 const struct entry_point_info *ep) __deprecated;
52
53 void *cm_get_context_by_mpidr(uint64_t mpidr,
54 uint32_t security_state) __deprecated;
55 void cm_set_context_by_mpidr(uint64_t mpidr,
56 void *context,
57 uint32_t security_state) __deprecated;
58
59 /* Inline definitions */
60
61 /*******************************************************************************
62 * This function is used to program the context that's used for exception
63 * return. This initializes the SP_EL3 to a pointer to a 'cpu_context' set for
64 * the required security state
65 ******************************************************************************/
cm_set_next_context(void * context)66 static inline void cm_set_next_context(void *context)
67 {
68 #if ENABLE_ASSERTIONS
69 uint64_t sp_mode;
70
71 /*
72 * Check that this function is called with SP_EL0 as the stack
73 * pointer
74 */
75 __asm__ volatile("mrs %0, SPSel\n"
76 : "=r" (sp_mode));
77
78 assert(sp_mode == MODE_SP_EL0);
79 #endif /* ENABLE_ASSERTIONS */
80
81 __asm__ volatile("msr spsel, #1\n"
82 "mov sp, %0\n"
83 "msr spsel, #0\n"
84 : : "r" (context));
85 }
86
87 #else
88 void *cm_get_next_context(void);
89 void cm_set_next_context(void *context);
90 #endif /* AARCH32 */
91
92 #endif /* __CM_H__ */
93