Module Name: src
Committed By: jmcneill
Date: Sat Aug 7 21:21:49 UTC 2021
Modified Files:
src/sys/arch/arm/arm: smccc.c smccc.h
Log Message:
arm: SMCCC: Add return values to smccc_call
To generate a diff of this commit:
cvs rdiff -u -r1.1 -r1.2 src/sys/arch/arm/arm/smccc.c \
src/sys/arch/arm/arm/smccc.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/arm/arm/smccc.c
diff -u src/sys/arch/arm/arm/smccc.c:1.1 src/sys/arch/arm/arm/smccc.c:1.2
--- src/sys/arch/arm/arm/smccc.c:1.1 Fri Aug 6 19:38:53 2021
+++ src/sys/arch/arm/arm/smccc.c Sat Aug 7 21:21:49 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */
+/* $NetBSD: smccc.c,v 1.2 2021/08/07 21:21:49 jmcneill Exp $ */
/*-
* Copyright (c) 2021 Jared McNeill <[email protected]>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: smccc.c,v 1.2 2021/08/07 21:21:49 jmcneill Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@@ -42,7 +42,10 @@ __KERNEL_RCSID(0, "$NetBSD: smccc.c,v 1.
#define SMCCC_VERSION 0x80000000
/* True if SMCCC is detected. */
-static bool smccc_present;
+static bool smccc_present;
+
+/* SMCCC conduit (SMC or HVC) */
+static enum psci_conduit smccc_conduit = PSCI_CONDUIT_NONE;
/*
* smccc_probe --
@@ -58,6 +61,13 @@ smccc_probe(void)
}
smccc_present = psci_features(SMCCC_VERSION) == PSCI_SUCCESS;
+ if (smccc_present) {
+ smccc_conduit = psci_conduit();
+
+ aprint_debug("SMCCC: Version %#x (%s)\n",
+ smccc_version(),
+ smccc_conduit == PSCI_CONDUIT_SMC ? "SMC" : "HVC");
+ }
}
return smccc_present;
}
@@ -70,7 +80,8 @@ smccc_probe(void)
int
smccc_version(void)
{
- return smccc_call(SMCCC_VERSION, 0, 0, 0);
+ return smccc_call(SMCCC_VERSION, 0, 0, 0, 0,
+ NULL, NULL, NULL, NULL);
}
/*
@@ -79,11 +90,54 @@ smccc_version(void)
* Generic call interface for SMC/HVC calls.
*/
int
-smccc_call(register_t fid, register_t arg1, register_t arg2, register_t arg3)
+smccc_call(uint32_t fid,
+ register_t arg1, register_t arg2, register_t arg3, register_t arg4,
+ register_t *res0, register_t *res1, register_t *res2, register_t *res3)
{
+ register_t args[5] = { fid, arg1, arg2, arg3, arg4 };
+
+ register register_t r0 asm ("r0");
+ register register_t r1 asm ("r1");
+ register register_t r2 asm ("r2");
+ register register_t r3 asm ("r3");
+ register register_t r4 asm ("r4");
+
if (!smccc_present) {
return SMCCC_NOT_SUPPORTED;
}
- return psci_call(fid, arg1, arg2, arg3);
+ KASSERT(smccc_conduit != PSCI_CONDUIT_NONE);
+
+ r0 = args[0];
+ r1 = args[1];
+ r2 = args[2];
+ r3 = args[3];
+ r4 = args[4];
+
+ if (smccc_conduit == PSCI_CONDUIT_SMC) {
+ asm volatile ("smc #0" :
+ "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) :
+ "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4) :
+ "memory");
+ } else {
+ asm volatile ("hvc #0" :
+ "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) :
+ "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4) :
+ "memory");
+ }
+
+ if (res0) {
+ *res0 = r0;
+ }
+ if (res1) {
+ *res1 = r1;
+ }
+ if (res2) {
+ *res2 = r2;
+ }
+ if (res3) {
+ *res3 = r3;
+ }
+
+ return r0;
}
Index: src/sys/arch/arm/arm/smccc.h
diff -u src/sys/arch/arm/arm/smccc.h:1.1 src/sys/arch/arm/arm/smccc.h:1.2
--- src/sys/arch/arm/arm/smccc.h:1.1 Fri Aug 6 19:38:53 2021
+++ src/sys/arch/arm/arm/smccc.h Sat Aug 7 21:21:49 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: smccc.h,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */
+/* $NetBSD: smccc.h,v 1.2 2021/08/07 21:21:49 jmcneill Exp $ */
/*-
* Copyright (c) 2021 Jared McNeill <[email protected]>
@@ -50,6 +50,7 @@ int smccc_version(void);
/*
* Call an SMC/HVC service.
*/
-int smccc_call(register_t, register_t, register_t, register_t);
+int smccc_call(uint32_t, register_t, register_t, register_t, register_t,
+ register_t *, register_t *, register_t *, register_t *);
#endif /* _ARM_SMCCC_H */
