aboutsummaryrefslogtreecommitdiff
path: root/include/common/smcc_helpers.h
blob: 6279cf23873a0cce01464de0b15cdf770e6fee2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/*
 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __SMCC_HELPERS_H__
#define __SMCC_HELPERS_H__

/*******************************************************************************
 * Bit definitions inside the function id as per the SMC calling convention
 ******************************************************************************/
#define FUNCID_TYPE_SHIFT		31
#define FUNCID_CC_SHIFT			30
#define FUNCID_OEN_SHIFT		24
#define FUNCID_NUM_SHIFT		0

#define FUNCID_TYPE_MASK		0x1
#define FUNCID_CC_MASK			0x1
#define FUNCID_OEN_MASK			0x3f
#define FUNCID_NUM_MASK			0xffff

#define FUNCID_TYPE_WIDTH		1
#define FUNCID_CC_WIDTH			1
#define FUNCID_OEN_WIDTH		6
#define FUNCID_NUM_WIDTH		16

#define GET_SMC_CC(id)			((id >> FUNCID_CC_SHIFT) & \
					 FUNCID_CC_MASK)
#define GET_SMC_TYPE(id)		((id >> FUNCID_TYPE_SHIFT) & \
					 FUNCID_TYPE_MASK)

#define SMC_64				1
#define SMC_32				0
#define SMC_UNK				0xffffffff
#define SMC_TYPE_FAST			1
#define SMC_TYPE_STD			0
#define SMC_PREEMPTED		0xfffffffe
/*******************************************************************************
 * Owning entity number definitions inside the function id as per the SMC
 * calling convention
 ******************************************************************************/
#define OEN_ARM_START			0
#define OEN_ARM_END			0
#define OEN_CPU_START			1
#define OEN_CPU_END			1
#define OEN_SIP_START			2
#define OEN_SIP_END			2
#define OEN_OEM_START			3
#define OEN_OEM_END			3
#define OEN_STD_START			4	/* Standard Calls */
#define OEN_STD_END			4
#define OEN_TAP_START			48	/* Trusted Applications */
#define OEN_TAP_END			49
#define OEN_TOS_START			50	/* Trusted OS */
#define OEN_TOS_END			63
#define OEN_LIMIT			64

#ifndef __ASSEMBLY__

#include <cassert.h>
#include <context.h>
#include <stdint.h>

/* Various flags passed to SMC handlers */
#define SMC_FROM_SECURE		(0 << 0)
#define SMC_FROM_NON_SECURE	(1 << 0)

#define is_caller_non_secure(_f)	(!!(_f & SMC_FROM_NON_SECURE))
#define is_caller_secure(_f)		(!(is_caller_non_secure(_f)))

/* Convenience macros to return from SMC handler */
#define SMC_RET0(_h)	{ \
	return (uint64_t) (_h);		\
}
#define SMC_RET1(_h, _x0)	{ \
	write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X0, (_x0)); \
	SMC_RET0(_h);						\
}
#define SMC_RET2(_h, _x0, _x1)	{ \
	write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X1, (_x1)); \
	SMC_RET1(_h, (_x0)); \
}
#define SMC_RET3(_h, _x0, _x1, _x2)	{ \
	write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X2, (_x2)); \
	SMC_RET2(_h, (_x0), (_x1)); \
}
#define SMC_RET4(_h, _x0, _x1, _x2, _x3)	{ \
	write_ctx_reg(get_gpregs_ctx(_h), CTX_GPREG_X3, (_x3)); \
	SMC_RET3(_h, (_x0), (_x1), (_x2)); \
}

/*
 * Convenience macros to access general purpose registers using handle provided
 * to SMC handler. These takes the offset values defined in context.h
 */
#define SMC_GET_GP(_h, _g) \
	read_ctx_reg(get_gpregs_ctx(_h), (_g))
#define SMC_SET_GP(_h, _g, _v) \
	write_ctx_reg(get_gpregs_ctx(_h), (_g), (_v))

/*
 * Convenience macros to access EL3 context registers using handle provided to
 * SMC handler. These takes the offset values defined in context.h
 */
#define SMC_GET_EL3(_h, _e) \
	read_ctx_reg(get_el3state_ctx(_h), (_e))
#define SMC_SET_EL3(_h, _e, _v) \
	write_ctx_reg(get_el3state_ctx(_h), (_e), (_v))

/* The macro below is used to identify a Standard Service SMC call */
#define is_std_svc_call(_fid)		((((_fid) >> FUNCID_OEN_SHIFT) & \
					   FUNCID_OEN_MASK) == OEN_STD_START)

/* The macro below is used to identify a valid Fast SMC call */
#define is_valid_fast_smc(_fid)		((!(((_fid) >> 16) & 0xff)) && \
					   (GET_SMC_TYPE(_fid) == SMC_TYPE_FAST))

/*
 * Macro to define UUID for services. Apart from defining and initializing a
 * uuid_t structure, this macro verifies that the first word of the defined UUID
 * does not equal SMC_UNK. This is to ensure that the caller won't mistake the
 * returned UUID in x0 for an invalid SMC error return
 */
#define DEFINE_SVC_UUID(_name, _tl, _tm, _th, _cl, _ch, \
		_n0, _n1, _n2, _n3, _n4, _n5) \
	CASSERT(_tl != SMC_UNK, invalid_svc_uuid);\
	static const uuid_t _name = { \
		_tl, _tm, _th, _cl, _ch, \
		{ _n0, _n1, _n2, _n3, _n4, _n5 } \
	}

/* Return a UUID in the SMC return registers */
#define SMC_UUID_RET(_h, _uuid) \
	SMC_RET4(handle, ((const uint32_t *) &(_uuid))[0], \
			 ((const uint32_t *) &(_uuid))[1], \
			 ((const uint32_t *) &(_uuid))[2], \
			 ((const uint32_t *) &(_uuid))[3])

#endif /*__ASSEMBLY__*/
#endif /* __SMCC_HELPERS_H__ */