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-rw-r--r--kernel/arch/arm64/include/asm/efi.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/kernel/arch/arm64/include/asm/efi.h b/kernel/arch/arm64/include/asm/efi.h
new file mode 100644
index 000000000..ef572206f
--- /dev/null
+++ b/kernel/arch/arm64/include/asm/efi.h
@@ -0,0 +1,69 @@
+#ifndef _ASM_EFI_H
+#define _ASM_EFI_H
+
+#include <asm/io.h>
+#include <asm/neon.h>
+
+#ifdef CONFIG_EFI
+extern void efi_init(void);
+#else
+#define efi_init()
+#endif
+
+#define efi_call_virt(f, ...) \
+({ \
+ efi_##f##_t *__f; \
+ efi_status_t __s; \
+ \
+ kernel_neon_begin(); \
+ efi_virtmap_load(); \
+ __f = efi.systab->runtime->f; \
+ __s = __f(__VA_ARGS__); \
+ efi_virtmap_unload(); \
+ kernel_neon_end(); \
+ __s; \
+})
+
+#define __efi_call_virt(f, ...) \
+({ \
+ efi_##f##_t *__f; \
+ \
+ kernel_neon_begin(); \
+ efi_virtmap_load(); \
+ __f = efi.systab->runtime->f; \
+ __f(__VA_ARGS__); \
+ efi_virtmap_unload(); \
+ kernel_neon_end(); \
+})
+
+/* arch specific definitions used by the stub code */
+
+/*
+ * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
+ * start of kernel and may not cross a 2MiB boundary. We set alignment to
+ * 2MiB so we know it won't cross a 2MiB boundary.
+ */
+#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
+#define MAX_FDT_OFFSET SZ_512M
+
+#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
+
+#define EFI_ALLOC_ALIGN SZ_64K
+
+/*
+ * On ARM systems, virtually remapped UEFI runtime services are set up in two
+ * distinct stages:
+ * - The stub retrieves the final version of the memory map from UEFI, populates
+ * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
+ * service to communicate the new mapping to the firmware (Note that the new
+ * mapping is not live at this time)
+ * - During an early initcall(), the EFI system table is permanently remapped
+ * and the virtual remapping of the UEFI Runtime Services regions is loaded
+ * into a private set of page tables. If this all succeeds, the Runtime
+ * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
+ */
+
+void efi_virtmap_load(void);
+void efi_virtmap_unload(void);
+
+#endif /* _ASM_EFI_H */