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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] xen/arm: add SMC wrapper that is compatible with SMCCC v1.0
commit 0daec62e9df569bd9e90499e41c1a9c3c348aa96
Author: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
AuthorDate: Mon Oct 1 13:46:36 2018 +0100
Commit: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Mon Oct 1 13:45:13 2018 -0700
xen/arm: add SMC wrapper that is compatible with SMCCC v1.0
Existing SMC wrapper call_smc() allows only 4 parameters and
returns only one value. This is enough for existing
use in PSCI code, but TEE mediator will need a call that is
fully compatible with ARM SMCCC v1.0.
This patch adds a wrapper for both arm32 and arm64. In the case of
arm32, the wrapper is just an alias to the ARM SMCCC v1.1 as the
convention is the same.
CC: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
[julien: Rework the wrapper to make it closer to SMCC 1.1 wrapper]
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
xen/arch/arm/arm64/Makefile | 1 +
xen/arch/arm/arm64/asm-offsets.c | 5 ++++
xen/arch/arm/arm64/smc.S | 32 +++++++++++++++++++++++++
xen/include/asm-arm/smccc.h | 51 +++++++++++++++++++++++++++++++++++++++-
4 files changed, 88 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/arm64/Makefile b/xen/arch/arm/arm64/Makefile
index bb5c610b2a..c4f3a28a0d 100644
--- a/xen/arch/arm/arm64/Makefile
+++ b/xen/arch/arm/arm64/Makefile
@@ -8,6 +8,7 @@ obj-y += domain.o
obj-y += entry.o
obj-y += insn.o
obj-$(CONFIG_LIVEPATCH) += livepatch.o
+obj-y += smc.o
obj-y += smpboot.o
obj-y += traps.o
obj-y += vfp.o
diff --git a/xen/arch/arm/arm64/asm-offsets.c b/xen/arch/arm/arm64/asm-offsets.c
index 62833d8c8b..280ddb55bf 100644
--- a/xen/arch/arm/arm64/asm-offsets.c
+++ b/xen/arch/arm/arm64/asm-offsets.c
@@ -10,6 +10,7 @@
#include <xen/bitops.h>
#include <public/xen.h>
#include <asm/current.h>
+#include <asm/smccc.h>
#define DEFINE(_sym, _val) \
asm volatile ("\n.ascii\"==>#define " #_sym " %0 /* " #_val " */<==\"" \
@@ -51,6 +52,10 @@ void __dummy__(void)
BLANK();
OFFSET(INITINFO_stack, struct init_info, stack);
+
+ BLANK();
+ OFFSET(SMCCC_RES_a0, struct arm_smccc_res, a0);
+ OFFSET(SMCCC_RES_a2, struct arm_smccc_res, a2);
}
/*
diff --git a/xen/arch/arm/arm64/smc.S b/xen/arch/arm/arm64/smc.S
new file mode 100644
index 0000000000..b0752be57e
--- /dev/null
+++ b/xen/arch/arm/arm64/smc.S
@@ -0,0 +1,32 @@
+/*
+ * xen/arch/arm/arm64/smc.S
+ *
+ * Wrapper for Secure Monitors Calls
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/asm_defns.h>
+#include <asm/macros.h>
+
+/*
+ * void __arm_smccc_1_0_smc(register_t a0, register_t a1, register_t a2,
+ * register_t a3, register_t a4, register_t a5,
+ * register_t a6, register_t a7,
+ * struct arm_smccc_res *res)
+ */
+ENTRY(__arm_smccc_1_0_smc)
+ smc #0
+ ldr x4, [sp]
+ cbz x4, 1f /* No need to store the result */
+ stp x0, x1, [x4, #SMCCC_RES_a0]
+ stp x2, x3, [x4, #SMCCC_RES_a2]
+1:
+ ret
diff --git a/xen/include/asm-arm/smccc.h b/xen/include/asm-arm/smccc.h
index 648bef28bd..1ed6cbaa48 100644
--- a/xen/include/asm-arm/smccc.h
+++ b/xen/include/asm-arm/smccc.h
@@ -207,7 +207,56 @@ struct arm_smccc_res {
*___res = (typeof(*___res)){r0, r1, r2, r3}; \
} while ( 0 )
-#endif
+/*
+ * The calling convention for arm32 is the same for both SMCCC v1.0 and
+ * v1.1.
+ */
+#ifdef CONFIG_ARM_32
+#define arm_smccc_1_0_smc(...) arm_smccc_1_1_smc(__VA_ARGS__)
+#else
+
+void __arm_smccc_1_0_smc(register_t a0, register_t a1, register_t a2,
+ register_t a3, register_t a4, register_t a5,
+ register_t a6, register_t a7,
+ struct arm_smccc_res *res);
+
+/* Macros to handle variadic parameter for SMCCC v1.0 helper */
+#define __arm_smccc_1_0_smc_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
+ __arm_smccc_1_0_smc(a0, a1, a2, a3, a4, a5, a6, a7, res)
+
+#define __arm_smccc_1_0_smc_6(a0, a1, a2, a3, a4, a5, a6, res) \
+ __arm_smccc_1_0_smc_7(a0, a1, a2, a3, a4, a5, a6, 0, res)
+
+#define __arm_smccc_1_0_smc_5(a0, a1, a2, a3, a4, a5, res) \
+ __arm_smccc_1_0_smc_6(a0, a1, a2, a3, a4, a5, 0, res)
+
+#define __arm_smccc_1_0_smc_4(a0, a1, a2, a3, a4, res) \
+ __arm_smccc_1_0_smc_5(a0, a1, a2, a3, a4, 0, res)
+
+#define __arm_smccc_1_0_smc_3(a0, a1, a2, a3, res) \
+ __arm_smccc_1_0_smc_4(a0, a1, a2, a3, 0, res)
+
+#define __arm_smccc_1_0_smc_2(a0, a1, a2, res) \
+ __arm_smccc_1_0_smc_3(a0, a1, a2, 0, res)
+
+#define __arm_smccc_1_0_smc_1(a0, a1, res) \
+ __arm_smccc_1_0_smc_2(a0, a1, 0, res)
+
+#define __arm_smccc_1_0_smc_0(a0, res) \
+ __arm_smccc_1_0_smc_1(a0, 0, res)
+
+#define ___arm_smccc_1_0_smc_count(count, ...) \
+ __arm_smccc_1_0_smc_ ## count(__VA_ARGS__)
+
+#define __arm_smccc_1_0_smc_count(count, ...) \
+ ___arm_smccc_1_0_smc_count(count, __VA_ARGS__)
+
+#define arm_smccc_1_0_smc(...) \
+ __arm_smccc_1_0_smc_count(__count_args(__VA_ARGS__), __VA_ARGS__)
+
+#endif /* CONFIG_ARM_64 */
+
+#endif /* __ASSEMBLY__ */
/*
* Construct function identifier from call type (fast or standard),
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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