1 files changed, 70 insertions, 0 deletions
diff --git a/include/lib/el3_runtime/aarch32/context.h b/include/lib/el3_runtime/aarch32/context.h
new file mode 100644
index 0000000..3b698e3
--- /dev/null
+++ b/include/lib/el3_runtime/aarch32/context.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2016-2020, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+#include <lib/utils_def.h>
+
+/*******************************************************************************
+ * Constants that allow assembler code to access members of and the 'regs'
+ * structure at their correct offsets.
+ ******************************************************************************/
+#define CTX_REGS_OFFSET		U(0x0)
+#define CTX_GPREG_R0		U(0x0)
+#define CTX_GPREG_R1		U(0x4)
+#define CTX_GPREG_R2		U(0x8)
+#define CTX_GPREG_R3		U(0xC)
+#define CTX_LR			U(0x10)
+#define CTX_SCR			U(0x14)
+#define CTX_SPSR		U(0x18)
+#define CTX_NS_SCTLR		U(0x1C)
+#define CTX_REGS_END		U(0x20)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+#include <lib/cassert.h>
+
+/*
+ * Common constants to help define the 'cpu_context' structure and its
+ * members below.
+ */
+#define WORD_SHIFT		U(2)
+#define DEFINE_REG_STRUCT(name, num_regs)	\
+	typedef struct name {			\
+		uint32_t ctx_regs[num_regs];	\
+	}  __aligned(8) name##_t
+
+/* Constants to determine the size of individual context structures */
+#define CTX_REG_ALL		(CTX_REGS_END >> WORD_SHIFT)
+
+DEFINE_REG_STRUCT(regs, CTX_REG_ALL);
+
+#undef CTX_REG_ALL
+
+#define read_ctx_reg(ctx, offset)	((ctx)->ctx_regs[offset >> WORD_SHIFT])
+#define write_ctx_reg(ctx, offset, val)	(((ctx)->ctx_regs[offset >> WORD_SHIFT]) \
+					 = val)
+typedef struct cpu_context {
+	regs_t regs_ctx;
+} cpu_context_t;
+
+/* Macros to access members of the 'cpu_context_t' structure */
+#define get_regs_ctx(h)		(&((cpu_context_t *) h)->regs_ctx)
+
+/*
+ * Compile time assertions related to the 'cpu_context' structure to
+ * ensure that the assembler and the compiler view of the offsets of
+ * the structure members is the same.
+ */
+CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx),
+	assert_core_context_regs_offset_mismatch);
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* CONTEXT_H */