From 15f537ccf96f891ee46c0d2d2b5d2021b0de2559 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marek=20Beh=C3=BAn?= <marek.behun@nic.cz>
Date: Thu, 20 May 2021 13:23:58 +0200
Subject: [PATCH] efi_loader: add macro for const EFI runtime data
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Add macro __efi_runtime_rodata, for const variables with similar purpose
as those using __efi_runtime_data.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
include/efi_loader.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index cfd68e329c..522696d635 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -694,6 +694,22 @@ ssize_t efi_dp_check_length(const struct efi_device_path *dp,
*/
#define __efi_runtime_data __section(".data.efi_runtime")
+/**
+ * __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 };
+ */
+#define __efi_runtime_rodata __section(".rodata.efi_runtime")
+
/**
* __efi_runtime - declares a function for EFI runtime section
*
@@ -911,6 +927,7 @@ efi_status_t efi_launch_capsules(void);
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
#define __efi_runtime_data
+#define __efi_runtime_rodata
#define __efi_runtime
static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
{
--
2.39.5