GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/include/lib/xlat_tables/xlat_tables.h

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef XLAT_TABLES_H
+#define XLAT_TABLES_H
+
+#include <lib/xlat_tables/xlat_tables_defs.h>
+
+#ifndef __ASSEMBLER__
+#include <stddef.h>
+#include <stdint.h>
+
+#include <lib/xlat_tables/xlat_mmu_helpers.h>
+
+/* Helper macro to define entries for mmap_region_t. It creates
+ * identity mappings for each region.
+ */
+#define MAP_REGION_FLAT(adr, sz, attr) MAP_REGION(adr, adr, sz, attr)
+
+/* Helper macro to define entries for mmap_region_t. It allows to
+ * re-map address mappings from 'pa' to 'va' for each region.
+ */
+#define MAP_REGION(pa, va, sz, attr) {(pa), (va), (sz), (attr)}
+
+/*
+ * Shifts and masks to access fields of an mmap attribute
+ */
+#define MT_TYPE_MASK	U(0x7)
+#define MT_TYPE(_attr)	((_attr) & MT_TYPE_MASK)
+/* Access permissions (RO/RW) */
+#define MT_PERM_SHIFT	U(3)
+/* Security state (SECURE/NS) */
+#define MT_SEC_SHIFT	U(4)
+/* Access permissions for instruction execution (EXECUTE/EXECUTE_NEVER) */
+#define MT_EXECUTE_SHIFT	U(5)
+
+/*
+ * Memory mapping attributes
+ */
+
+/*
+ * Memory types supported.
+ * These are organised so that, going down the list, the memory types are
+ * getting weaker; conversely going up the list the memory types are getting
+ * stronger.
+ */
+#define MT_DEVICE		U(0)
+#define MT_NON_CACHEABLE	U(1)
+#define MT_MEMORY		U(2)
+/* Values up to 7 are reserved to add new memory types in the future */
+
+#define MT_RO			(U(0) << MT_PERM_SHIFT)
+#define MT_RW			(U(1) << MT_PERM_SHIFT)
+
+#define MT_SECURE		(U(0) << MT_SEC_SHIFT)
+#define MT_NS			(U(1) << MT_SEC_SHIFT)
+
+/*
+ * Access permissions for instruction execution are only relevant for normal
+ * read-only memory, i.e. MT_MEMORY | MT_RO. They are ignored (and potentially
+ * overridden) otherwise:
+ *  - Device memory is always marked as execute-never.
+ *  - Read-write normal memory is always marked as execute-never.
+ */
+#define MT_EXECUTE		(U(0) << MT_EXECUTE_SHIFT)
+#define MT_EXECUTE_NEVER	(U(1) << MT_EXECUTE_SHIFT)
+
+/* Compound attributes for most common usages */
+#define MT_CODE			(MT_MEMORY | MT_RO | MT_EXECUTE)
+#define MT_RO_DATA		(MT_MEMORY | MT_RO | MT_EXECUTE_NEVER)
+
+/* Memory type for EL3 regions */
+#if ENABLE_RME
+#error FEAT_RME requires version 2 of the Translation Tables Library
+#else
+#define EL3_PAS			MT_SECURE
+#endif
+
+/*
+ * Structure for specifying a single region of memory.
+ */
+typedef struct mmap_region {
+	unsigned long long	base_pa;
+	uintptr_t		base_va;
+	size_t			size;
+	unsigned int		attr;
+} mmap_region_t;
+
+/* Generic translation table APIs */
+void init_xlat_tables(void);
+void mmap_add_region(unsigned long long base_pa, uintptr_t base_va,
+		     size_t size, unsigned int attr);
+void mmap_add(const mmap_region_t *mm);
+
+#endif /*__ASSEMBLER__*/
+#endif /* XLAT_TABLES_H */