1 /*
2  * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #ifndef RMMD_PRIVATE_H
8 #define RMMD_PRIVATE_H
9 
10 #include <context.h>
11 
12 /*******************************************************************************
13  * Constants that allow assembler code to preserve callee-saved registers of the
14  * C runtime context while performing a security state switch.
15  ******************************************************************************/
16 #define RMMD_C_RT_CTX_X19		0x0
17 #define RMMD_C_RT_CTX_X20		0x8
18 #define RMMD_C_RT_CTX_X21		0x10
19 #define RMMD_C_RT_CTX_X22		0x18
20 #define RMMD_C_RT_CTX_X23		0x20
21 #define RMMD_C_RT_CTX_X24		0x28
22 #define RMMD_C_RT_CTX_X25		0x30
23 #define RMMD_C_RT_CTX_X26		0x38
24 #define RMMD_C_RT_CTX_X27		0x40
25 #define RMMD_C_RT_CTX_X28		0x48
26 #define RMMD_C_RT_CTX_X29		0x50
27 #define RMMD_C_RT_CTX_X30		0x58
28 
29 #define RMMD_C_RT_CTX_SIZE		0x60
30 #define RMMD_C_RT_CTX_ENTRIES		(RMMD_C_RT_CTX_SIZE >> DWORD_SHIFT)
31 
32 #ifndef __ASSEMBLER__
33 #include <stdint.h>
34 #include <services/rmi_svc.h>
35 
36 typedef enum rmm_state {
37 	RMM_STATE_RESET = 0,
38 	RMM_STATE_IDLE
39 } rmm_state_t;
40 
41 /*
42  * Data structure used by the RMM dispatcher (RMMD) in EL3 to track context of
43  * the RMM at R-EL2.
44  */
45 typedef struct rmmd_rmm_context {
46 	uint64_t c_rt_ctx;
47 	cpu_context_t cpu_ctx;
48 	rmm_state_t state;
49 } rmmd_rmm_context_t;
50 
51 /* Functions used to enter/exit the RMM synchronously */
52 uint64_t rmmd_rmm_sync_entry(rmmd_rmm_context_t *ctx);
53 __dead2 void rmmd_rmm_sync_exit(uint64_t rc);
54 
55 /* Assembly helpers */
56 uint64_t rmmd_rmm_enter(uint64_t *c_rt_ctx);
57 void __dead2 rmmd_rmm_exit(uint64_t c_rt_ctx, uint64_t ret);
58 
59 /* Reference to PM ops for the RMMD */
60 extern const spd_pm_ops_t rmmd_pm;
61 
62 #endif /* __ASSEMBLER__ */
63 
64 #endif /* RMMD_PRIVATE_H */
65