[PATCH v1 07/54] efi: types: add EFI_RUNTIME_SECTION

[Ahmad Fatoum]

With barebox acting as EFI loader, parts of it will remain resident in
RAM to provide runtime services. Add the necessary definitions for
annotating runtime data and services.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 include/efi/attributes.h | 84 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/include/efi/attributes.h b/include/efi/attributes.h
index 49d401b8fab1..fe5e5f823ab9 100644
--- a/include/efi/attributes.h
+++ b/include/efi/attributes.h
@@ -2,6 +2,10 @@
 #ifndef _EFI_ATTRIBUTES_H_
 #define _EFI_ATTRIBUTES_H_
 
+#ifndef __ASSEMBLY__
+
+#include <linux/compiler.h>
+
 #ifdef __x86_64__
 #define EFIAPI __attribute__((ms_abi))
 #define efi_va_list __builtin_ms_va_list
@@ -18,4 +22,84 @@
 #define efi_va_end va_end
 #endif /* __x86_64__ */
 
+#ifdef CONFIG_EFI_RUNTIME
+/**
+ * __efi_runtime_data - declares a non-const variable for EFI runtime section
+ *
+ * This macro indicates that a variable is non-const and should go into the
+ * EFI runtime section, and thus still be available when the OS is running.
+ *
+ * Only use on variables not declared const.
+ *
+ * Example:
+ *
+ * ::
+ *
+ *   static __efi_runtime_data my_computed_table[256];
+ */
+#ifndef __efi_runtime_data
+#define __efi_runtime_data __section(.efi_runtime.data)
+#endif
+
+/**
+ * __efi_runtime_rodata - declares a read-only variable for EFI runtime section
+ *
+ * This macro indicates that a variable is read-only (const) and should go into
+ * the EFI runtime section, and thus still be available when the OS is running.
+ *
+ * Only use on variables also declared const.
+ *
+ * Example:
+ *
+ * ::
+ *
+ *   static const __efi_runtime_rodata my_const_table[] = { 1, 2, 3 };
+ */
+#ifndef __efi_runtime_rodata
+#define __efi_runtime_rodata __section(.efi_runtime.rodata)
+#endif
+
+/**
+ * __efi_runtime - declares a function for EFI runtime section
+ *
+ * This macro indicates that a function should go into the EFI runtime section,
+ * and thus still be available when the OS is running.
+ *
+ * Example:
+ *
+ * ::
+ *
+ *   static __efi_runtime compute_my_table(void);
+ */
+#ifndef __efi_runtime
+#define __efi_runtime __section(.efi_runtime.text) \
+	notrace __no_sanitize_address __no_stack_protector
+#endif
+#endif /* CONFIG_EFI_RUNTIME */
+
+/* We #ifndef beforehand to allow compiler flags to override */
+#ifndef __efi_runtime_data
+#define __efi_runtime_data
+#endif
+
+#ifndef __efi_runtime_rodata
+#define __efi_runtime_rodata
+#endif
+
+#ifndef __efi_runtime
+#define __efi_runtime
+#endif
+
+#else  /* __ASSEMBLY__ */
+
+#if defined(CONFIG_EFI_RUNTIME) && !defined(EFI_RUNTIME_SECTION)
+#define EFI_RUNTIME_SECTION(sect) .efi_runtime##sect
+#endif
+
+#ifndef EFI_RUNTIME_SECTION
+#define EFI_RUNTIME_SECTION(sect) sect
+#endif
+
+#endif
+
 #endif
-- 
2.47.3