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_TRUSTED_APP 48
53 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
54 #define ARM_SMCCC_OWNER_TRUSTED_OS 50
55 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
57 #define ARM_SMCCC_QUIRK_NONE 0
58 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
60 #define ARM_SMCCC_VERSION_1_0 0x10000
61 #define ARM_SMCCC_VERSION_1_1 0x10001
62 #define ARM_SMCCC_VERSION_1_2 0x10002
64 #define ARM_SMCCC_VERSION_FUNC_ID \
65 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
69 #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
70 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
74 #define ARM_SMCCC_ARCH_SOC_ID \
75 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
79 #define ARM_SMCCC_ARCH_WORKAROUND_1 \
80 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
84 #define ARM_SMCCC_ARCH_WORKAROUND_2 \
85 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
89 /* Paravirtualised time calls (defined by ARM DEN0057A) */
90 #define ARM_SMCCC_HV_PV_TIME_FEATURES \
91 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
93 ARM_SMCCC_OWNER_STANDARD_HYP, \
96 #define ARM_SMCCC_HV_PV_TIME_ST \
97 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
99 ARM_SMCCC_OWNER_STANDARD_HYP, \
103 * Return codes defined in ARM DEN 0070A
104 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
106 #define SMCCC_RET_SUCCESS 0
107 #define SMCCC_RET_NOT_SUPPORTED -1
108 #define SMCCC_RET_NOT_REQUIRED -2
109 #define SMCCC_RET_INVALID_PARAMETER -3
113 #include <linux/linkage.h>
114 #include <linux/types.h>
116 enum arm_smccc_conduit {
123 * arm_smccc_1_1_get_conduit()
125 * Returns the conduit to be used for SMCCCv1.1 or later.
127 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
129 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
132 * arm_smccc_get_version()
134 * Returns the version to be used for SMCCCv1.1 or later.
136 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
137 * does not imply the presence of firmware or a valid conduit. Caller
138 * handling SMCCCv1.0 must determine the conduit by other means.
140 u32 arm_smccc_get_version(void);
142 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
145 * struct arm_smccc_res - Result from SMC/HVC call
146 * @a0-a3 result values from registers 0 to 3
148 struct arm_smccc_res {
156 * struct arm_smccc_quirk - Contains quirk information
157 * @id: quirk identification
158 * @state: quirk specific information
159 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
161 struct arm_smccc_quirk {
169 * __arm_smccc_smc() - make SMC calls
170 * @a0-a7: arguments passed in registers 0 to 7
171 * @res: result values from registers 0 to 3
172 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
174 * This function is used to make SMC calls following SMC Calling Convention.
175 * The content of the supplied param are copied to registers 0 to 7 prior
176 * to the SMC instruction. The return values are updated with the content
177 * from register 0 to 3 on return from the SMC instruction. An optional
178 * quirk structure provides vendor specific behavior.
180 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
181 unsigned long a2, unsigned long a3, unsigned long a4,
182 unsigned long a5, unsigned long a6, unsigned long a7,
183 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
186 * __arm_smccc_hvc() - make HVC calls
187 * @a0-a7: arguments passed in registers 0 to 7
188 * @res: result values from registers 0 to 3
189 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
191 * This function is used to make HVC calls following SMC Calling
192 * Convention. The content of the supplied param are copied to registers 0
193 * to 7 prior to the HVC instruction. The return values are updated with
194 * the content from register 0 to 3 on return from the HVC instruction. An
195 * optional quirk structure provides vendor specific behavior.
197 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
198 unsigned long a2, unsigned long a3, unsigned long a4,
199 unsigned long a5, unsigned long a6, unsigned long a7,
200 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
202 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
204 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
206 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
208 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
210 /* SMCCC v1.1 implementation madness follows */
213 #define SMCCC_SMC_INST "smc #0"
214 #define SMCCC_HVC_INST "hvc #0"
216 #elif defined(CONFIG_ARM)
217 #include <asm/opcodes-sec.h>
218 #include <asm/opcodes-virt.h>
220 #define SMCCC_SMC_INST __SMC(0)
221 #define SMCCC_HVC_INST __HVC(0)
225 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
227 #define __count_args(...) \
228 ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
230 #define __constraint_write_0 \
231 "+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3)
232 #define __constraint_write_1 \
233 "+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3)
234 #define __constraint_write_2 \
235 "+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3)
236 #define __constraint_write_3 \
237 "+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3)
238 #define __constraint_write_4 __constraint_write_3
239 #define __constraint_write_5 __constraint_write_4
240 #define __constraint_write_6 __constraint_write_5
241 #define __constraint_write_7 __constraint_write_6
243 #define __constraint_read_0
244 #define __constraint_read_1
245 #define __constraint_read_2
246 #define __constraint_read_3
247 #define __constraint_read_4 "r" (r4)
248 #define __constraint_read_5 __constraint_read_4, "r" (r5)
249 #define __constraint_read_6 __constraint_read_5, "r" (r6)
250 #define __constraint_read_7 __constraint_read_6, "r" (r7)
252 #define __declare_arg_0(a0, res) \
253 struct arm_smccc_res *___res = res; \
254 register unsigned long r0 asm("r0") = (u32)a0; \
255 register unsigned long r1 asm("r1"); \
256 register unsigned long r2 asm("r2"); \
257 register unsigned long r3 asm("r3")
259 #define __declare_arg_1(a0, a1, res) \
260 typeof(a1) __a1 = a1; \
261 struct arm_smccc_res *___res = res; \
262 register unsigned long r0 asm("r0") = (u32)a0; \
263 register unsigned long r1 asm("r1") = __a1; \
264 register unsigned long r2 asm("r2"); \
265 register unsigned long r3 asm("r3")
267 #define __declare_arg_2(a0, a1, a2, res) \
268 typeof(a1) __a1 = a1; \
269 typeof(a2) __a2 = a2; \
270 struct arm_smccc_res *___res = res; \
271 register unsigned long r0 asm("r0") = (u32)a0; \
272 register unsigned long r1 asm("r1") = __a1; \
273 register unsigned long r2 asm("r2") = __a2; \
274 register unsigned long r3 asm("r3")
276 #define __declare_arg_3(a0, a1, a2, a3, res) \
277 typeof(a1) __a1 = a1; \
278 typeof(a2) __a2 = a2; \
279 typeof(a3) __a3 = a3; \
280 struct arm_smccc_res *___res = res; \
281 register unsigned long r0 asm("r0") = (u32)a0; \
282 register unsigned long r1 asm("r1") = __a1; \
283 register unsigned long r2 asm("r2") = __a2; \
284 register unsigned long r3 asm("r3") = __a3
286 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \
287 typeof(a4) __a4 = a4; \
288 __declare_arg_3(a0, a1, a2, a3, res); \
289 register unsigned long r4 asm("r4") = __a4
291 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
292 typeof(a5) __a5 = a5; \
293 __declare_arg_4(a0, a1, a2, a3, a4, res); \
294 register unsigned long r5 asm("r5") = __a5
296 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
297 typeof(a6) __a6 = a6; \
298 __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
299 register unsigned long r6 asm("r6") = __a6
301 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
302 typeof(a7) __a7 = a7; \
303 __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
304 register unsigned long r7 asm("r7") = __a7
306 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
307 #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
309 #define ___constraints(count) \
310 : __constraint_write_ ## count \
311 : __constraint_read_ ## count \
313 #define __constraints(count) ___constraints(count)
316 * We have an output list that is not necessarily used, and GCC feels
317 * entitled to optimise the whole sequence away. "volatile" is what
320 #define __arm_smccc_1_1(inst, ...) \
322 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
323 asm volatile(inst "\n" \
324 __constraints(__count_args(__VA_ARGS__))); \
326 *___res = (typeof(*___res)){r0, r1, r2, r3}; \
330 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
332 * This is a variadic macro taking one to eight source arguments, and
333 * an optional return structure.
335 * @a0-a7: arguments passed in registers 0 to 7
336 * @res: result values from registers 0 to 3
338 * This macro is used to make SMC calls following SMC Calling Convention v1.1.
339 * The content of the supplied param are copied to registers 0 to 7 prior
340 * to the SMC instruction. The return values are updated with the content
341 * from register 0 to 3 on return from the SMC instruction if not NULL.
343 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
346 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
348 * This is a variadic macro taking one to eight source arguments, and
349 * an optional return structure.
351 * @a0-a7: arguments passed in registers 0 to 7
352 * @res: result values from registers 0 to 3
354 * This macro is used to make HVC calls following SMC Calling Convention v1.1.
355 * The content of the supplied param are copied to registers 0 to 7 prior
356 * to the HVC instruction. The return values are updated with the content
357 * from register 0 to 3 on return from the HVC instruction if not NULL.
359 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
362 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
363 * Used when the SMCCC conduit is not defined. The empty asm statement
364 * avoids compiler warnings about unused variables.
366 #define __fail_smccc_1_1(...) \
368 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
369 asm ("" __constraints(__count_args(__VA_ARGS__))); \
371 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
375 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
377 * This is a variadic macro taking one to eight source arguments, and
378 * an optional return structure.
380 * @a0-a7: arguments passed in registers 0 to 7
381 * @res: result values from registers 0 to 3
383 * This macro will make either an HVC call or an SMC call depending on the
384 * current SMCCC conduit. If no valid conduit is available then -1
385 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
387 * The return value also provides the conduit that was used.
389 #define arm_smccc_1_1_invoke(...) ({ \
390 int method = arm_smccc_1_1_get_conduit(); \
392 case SMCCC_CONDUIT_HVC: \
393 arm_smccc_1_1_hvc(__VA_ARGS__); \
395 case SMCCC_CONDUIT_SMC: \
396 arm_smccc_1_1_smc(__VA_ARGS__); \
399 __fail_smccc_1_1(__VA_ARGS__); \
400 method = SMCCC_CONDUIT_NONE; \
406 #endif /*__ASSEMBLY__*/
407 #endif /*__LINUX_ARM_SMCCC_H*/