1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2015, Linaro Limited
5 #ifndef __LINUX_ARM_SMCCC_H
6 #define __LINUX_ARM_SMCCC_H
8 #include <linux/init.h>
9 #include <uapi/linux/const.h>
12 * This file provides common defines for ARM SMC Calling Convention as
14 * https://developer.arm.com/docs/den0028/latest
16 * This code is up-to-date with version DEN 0028 C
19 #define ARM_SMCCC_STD_CALL _AC(0,U)
20 #define ARM_SMCCC_FAST_CALL _AC(1,U)
21 #define ARM_SMCCC_TYPE_SHIFT 31
23 #define ARM_SMCCC_SMC_32 0
24 #define ARM_SMCCC_SMC_64 1
25 #define ARM_SMCCC_CALL_CONV_SHIFT 30
27 #define ARM_SMCCC_OWNER_MASK 0x3F
28 #define ARM_SMCCC_OWNER_SHIFT 24
30 #define ARM_SMCCC_FUNC_MASK 0xFFFF
32 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
33 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
34 #define ARM_SMCCC_IS_64(smc_val) \
35 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
36 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
37 #define ARM_SMCCC_OWNER_NUM(smc_val) \
38 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
40 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
41 (((type) << ARM_SMCCC_TYPE_SHIFT) | \
42 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
43 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
44 ((func_num) & ARM_SMCCC_FUNC_MASK))
46 #define ARM_SMCCC_OWNER_ARCH 0
47 #define ARM_SMCCC_OWNER_CPU 1
48 #define ARM_SMCCC_OWNER_SIP 2
49 #define ARM_SMCCC_OWNER_OEM 3
50 #define ARM_SMCCC_OWNER_STANDARD 4
51 #define ARM_SMCCC_OWNER_STANDARD_HYP 5
52 #define ARM_SMCCC_OWNER_VENDOR_HYP 6
53 #define ARM_SMCCC_OWNER_TRUSTED_APP 48
54 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
55 #define ARM_SMCCC_OWNER_TRUSTED_OS 50
56 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
58 #define ARM_SMCCC_QUIRK_NONE 0
59 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
61 #define ARM_SMCCC_VERSION_1_0 0x10000
62 #define ARM_SMCCC_VERSION_1_1 0x10001
63 #define ARM_SMCCC_VERSION_1_2 0x10002
65 #define ARM_SMCCC_VERSION_FUNC_ID \
66 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
70 #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
71 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
75 #define ARM_SMCCC_ARCH_SOC_ID \
76 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
80 #define ARM_SMCCC_ARCH_WORKAROUND_1 \
81 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
85 #define ARM_SMCCC_ARCH_WORKAROUND_2 \
86 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
90 /* Paravirtualised time calls (defined by ARM DEN0057A) */
91 #define ARM_SMCCC_HV_PV_TIME_FEATURES \
92 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
94 ARM_SMCCC_OWNER_STANDARD_HYP, \
97 #define ARM_SMCCC_HV_PV_TIME_ST \
98 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
100 ARM_SMCCC_OWNER_STANDARD_HYP, \
104 * Return codes defined in ARM DEN 0070A
105 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
107 #define SMCCC_RET_SUCCESS 0
108 #define SMCCC_RET_NOT_SUPPORTED -1
109 #define SMCCC_RET_NOT_REQUIRED -2
110 #define SMCCC_RET_INVALID_PARAMETER -3
114 #include <linux/linkage.h>
115 #include <linux/types.h>
117 enum arm_smccc_conduit {
124 * arm_smccc_1_1_get_conduit()
126 * Returns the conduit to be used for SMCCCv1.1 or later.
128 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
130 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
133 * arm_smccc_get_version()
135 * Returns the version to be used for SMCCCv1.1 or later.
137 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
138 * does not imply the presence of firmware or a valid conduit. Caller
139 * handling SMCCCv1.0 must determine the conduit by other means.
141 u32 arm_smccc_get_version(void);
143 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
146 * struct arm_smccc_res - Result from SMC/HVC call
147 * @a0-a3 result values from registers 0 to 3
149 struct arm_smccc_res {
157 * struct arm_smccc_quirk - Contains quirk information
158 * @id: quirk identification
159 * @state: quirk specific information
160 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
162 struct arm_smccc_quirk {
170 * __arm_smccc_smc() - make SMC calls
171 * @a0-a7: arguments passed in registers 0 to 7
172 * @res: result values from registers 0 to 3
173 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
175 * This function is used to make SMC calls following SMC Calling Convention.
176 * The content of the supplied param are copied to registers 0 to 7 prior
177 * to the SMC instruction. The return values are updated with the content
178 * from register 0 to 3 on return from the SMC instruction. An optional
179 * quirk structure provides vendor specific behavior.
181 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
182 unsigned long a2, unsigned long a3, unsigned long a4,
183 unsigned long a5, unsigned long a6, unsigned long a7,
184 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
187 * __arm_smccc_hvc() - make HVC calls
188 * @a0-a7: arguments passed in registers 0 to 7
189 * @res: result values from registers 0 to 3
190 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
192 * This function is used to make HVC calls following SMC Calling
193 * Convention. The content of the supplied param are copied to registers 0
194 * to 7 prior to the HVC instruction. The return values are updated with
195 * the content from register 0 to 3 on return from the HVC instruction. An
196 * optional quirk structure provides vendor specific behavior.
198 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
199 unsigned long a2, unsigned long a3, unsigned long a4,
200 unsigned long a5, unsigned long a6, unsigned long a7,
201 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
203 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
205 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
207 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
209 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
211 /* SMCCC v1.1 implementation madness follows */
214 #define SMCCC_SMC_INST "smc #0"
215 #define SMCCC_HVC_INST "hvc #0"
217 #elif defined(CONFIG_ARM)
218 #include <asm/opcodes-sec.h>
219 #include <asm/opcodes-virt.h>
221 #define SMCCC_SMC_INST __SMC(0)
222 #define SMCCC_HVC_INST __HVC(0)
226 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
228 #define __count_args(...) \
229 ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
231 #define __constraint_read_0 "r" (arg0)
232 #define __constraint_read_1 __constraint_read_0, "r" (arg1)
233 #define __constraint_read_2 __constraint_read_1, "r" (arg2)
234 #define __constraint_read_3 __constraint_read_2, "r" (arg3)
235 #define __constraint_read_4 __constraint_read_3, "r" (arg4)
236 #define __constraint_read_5 __constraint_read_4, "r" (arg5)
237 #define __constraint_read_6 __constraint_read_5, "r" (arg6)
238 #define __constraint_read_7 __constraint_read_6, "r" (arg7)
240 #define __declare_arg_0(a0, res) \
241 struct arm_smccc_res *___res = res; \
242 register unsigned long arg0 asm("r0") = (u32)a0
244 #define __declare_arg_1(a0, a1, res) \
245 typeof(a1) __a1 = a1; \
246 struct arm_smccc_res *___res = res; \
247 register unsigned long arg0 asm("r0") = (u32)a0; \
248 register typeof(a1) arg1 asm("r1") = __a1
250 #define __declare_arg_2(a0, a1, a2, res) \
251 typeof(a1) __a1 = a1; \
252 typeof(a2) __a2 = a2; \
253 struct arm_smccc_res *___res = res; \
254 register unsigned long arg0 asm("r0") = (u32)a0; \
255 register typeof(a1) arg1 asm("r1") = __a1; \
256 register typeof(a2) arg2 asm("r2") = __a2
258 #define __declare_arg_3(a0, a1, a2, a3, res) \
259 typeof(a1) __a1 = a1; \
260 typeof(a2) __a2 = a2; \
261 typeof(a3) __a3 = a3; \
262 struct arm_smccc_res *___res = res; \
263 register unsigned long arg0 asm("r0") = (u32)a0; \
264 register typeof(a1) arg1 asm("r1") = __a1; \
265 register typeof(a2) arg2 asm("r2") = __a2; \
266 register typeof(a3) arg3 asm("r3") = __a3
268 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \
269 typeof(a4) __a4 = a4; \
270 __declare_arg_3(a0, a1, a2, a3, res); \
271 register typeof(a4) arg4 asm("r4") = __a4
273 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
274 typeof(a5) __a5 = a5; \
275 __declare_arg_4(a0, a1, a2, a3, a4, res); \
276 register typeof(a5) arg5 asm("r5") = __a5
278 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
279 typeof(a6) __a6 = a6; \
280 __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
281 register typeof(a6) arg6 asm("r6") = __a6
283 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
284 typeof(a7) __a7 = a7; \
285 __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
286 register typeof(a7) arg7 asm("r7") = __a7
288 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
289 #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
291 #define ___constraints(count) \
292 : __constraint_read_ ## count \
294 #define __constraints(count) ___constraints(count)
297 * We have an output list that is not necessarily used, and GCC feels
298 * entitled to optimise the whole sequence away. "volatile" is what
301 #define __arm_smccc_1_1(inst, ...) \
303 register unsigned long r0 asm("r0"); \
304 register unsigned long r1 asm("r1"); \
305 register unsigned long r2 asm("r2"); \
306 register unsigned long r3 asm("r3"); \
307 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
308 asm volatile(inst "\n" : \
309 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
310 __constraints(__count_args(__VA_ARGS__))); \
312 *___res = (typeof(*___res)){r0, r1, r2, r3}; \
316 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
318 * This is a variadic macro taking one to eight source arguments, and
319 * an optional return structure.
321 * @a0-a7: arguments passed in registers 0 to 7
322 * @res: result values from registers 0 to 3
324 * This macro is used to make SMC calls following SMC Calling Convention v1.1.
325 * The content of the supplied param are copied to registers 0 to 7 prior
326 * to the SMC instruction. The return values are updated with the content
327 * from register 0 to 3 on return from the SMC instruction if not NULL.
329 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
332 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
334 * This is a variadic macro taking one to eight source arguments, and
335 * an optional return structure.
337 * @a0-a7: arguments passed in registers 0 to 7
338 * @res: result values from registers 0 to 3
340 * This macro is used to make HVC calls following SMC Calling Convention v1.1.
341 * The content of the supplied param are copied to registers 0 to 7 prior
342 * to the HVC instruction. The return values are updated with the content
343 * from register 0 to 3 on return from the HVC instruction if not NULL.
345 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
348 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
349 * Used when the SMCCC conduit is not defined. The empty asm statement
350 * avoids compiler warnings about unused variables.
352 #define __fail_smccc_1_1(...) \
354 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
355 asm ("" : __constraints(__count_args(__VA_ARGS__))); \
357 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
361 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
363 * This is a variadic macro taking one to eight source arguments, and
364 * an optional return structure.
366 * @a0-a7: arguments passed in registers 0 to 7
367 * @res: result values from registers 0 to 3
369 * This macro will make either an HVC call or an SMC call depending on the
370 * current SMCCC conduit. If no valid conduit is available then -1
371 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
373 * The return value also provides the conduit that was used.
375 #define arm_smccc_1_1_invoke(...) ({ \
376 int method = arm_smccc_1_1_get_conduit(); \
378 case SMCCC_CONDUIT_HVC: \
379 arm_smccc_1_1_hvc(__VA_ARGS__); \
381 case SMCCC_CONDUIT_SMC: \
382 arm_smccc_1_1_smc(__VA_ARGS__); \
385 __fail_smccc_1_1(__VA_ARGS__); \
386 method = SMCCC_CONDUIT_NONE; \
392 #endif /*__ASSEMBLY__*/
393 #endif /*__LINUX_ARM_SMCCC_H*/