plat/arm64: Fix extregs allocation on Arm

Implement the extregs (currently only fpsimd registers) allocation
related helpers. Otherwise, Unikraft can't be built on Arm kvm plat
due to the missing of several helpers.

Signed-off-by: Jia He <justin.he@arm.com>
Reviewed-by: Răzvan Vîrtan <virtanrazvan@gmail.com>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Pull-Request: #206

diff --git a/plat/common/include/arm/arm64/cpu.h b/plat/common/include/arm/arm64/cpu.h
index e82f8fba13d98fe1896782fcd7f4c65461aaebbe..153d45a8c75e2708f031adf02715b6d0a456952d 100644 (file)
--- a/plat/common/include/arm/arm64/cpu.h
+++ b/plat/common/include/arm/arm64/cpu.h
@@ -169,24 +169,19 @@ static inline void restore_extregs(struct sw_ctx *ctx)
        fpsimd_restore_state(ctx->extregs);
 }
 
-static inline struct sw_ctx *arch_alloc_sw_ctx(struct uk_alloc *allocator)
+static inline void arch_init_extregs(struct sw_ctx *ctx)
 {
-       struct sw_ctx *ctx;
-
-       ctx = (struct sw_ctx *)uk_malloc(allocator,
-                       sizeof(struct sw_ctx) + sizeof(struct fpsimd_state));
        if (ctx)
-               ctx->extregs = (uintptr_t)((void *)ctx + sizeof(struct sw_ctx));
+               ctx->extregs = (uintptr_t)ctx->_extregs;
 
        uk_pr_debug("Allocating %lu + %lu bytes for sw ctx at %p, extregs at %p\n",
-                       sizeof(struct sw_ctx), sizeof(struct fpsimd_state),
-                       ctx, (void *)ctx->extregs);
-
-       return ctx;
+               sizeof(struct sw_ctx), sizeof(struct fpsimd_state),
+               ctx, (void *)ctx->extregs);
 }
 
-static inline void arch_init_extregs(struct sw_ctx *ctx __unused)
+static inline __sz arch_extregs_size(void)
 {
+       return sizeof(struct fpsimd_state);
 }
 
 #else /* !CONFIG_FPSIMD */
@@ -198,21 +193,17 @@ static inline void restore_extregs(struct sw_ctx *ctx __unused)
 {
 }
 
-static inline struct sw_ctx *arch_alloc_sw_ctx(struct uk_alloc *allocator)
+static inline void arch_init_extregs(struct sw_ctx *ctx)
 {
-       struct sw_ctx *ctx;
-
-       ctx = (struct sw_ctx *)uk_malloc(allocator, sizeof(struct sw_ctx));
-       uk_pr_debug("Allocating %lu bytes for sw ctx at %p\n",
-               sizeof(struct sw_ctx), ctx);
-
-       return ctx;
+       if (ctx)
+               ctx->extregs = (uintptr_t)ctx->_extregs;
 }
 
-static inline void arch_init_extregs(struct sw_ctx *ctx)
+static inline __sz arch_extregs_size(void)
 {
-       ctx->extregs = (uintptr_t)ctx + sizeof(struct sw_ctx);
+       return 0;
 }
-
 #endif /* CONFIG_FPSIMD */
+
+
 #endif /* __PLAT_COMMON_ARM64_CPU_H__ */