Unlike on 32-bit ARM, where we need to pass the stub's version of struct
screen_info to the kernel proper via a configuration table, on 64-bit ARM
it simply involves making the core kernel's copy of struct screen_info
visible to the stub by exposing an __efistub_ alias for it.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
arch/arm64/include/asm/efi.h | 3 +++
arch/arm64/kernel/efi.c | 3 +++
arch/arm64/kernel/image.h | 1 +
3 files changed, 7 insertions(+)
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index bb26f2205973..ed6c85d3a583 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -54,6 +54,9 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
#define __efi_call_early(f, ...) f(__VA_ARGS__)
#define efi_is_64bit() (true)
+#define alloc_screen_info(x...) &screen_info
+#define free_screen_info(x...)
+
#define EFI_ALLOC_ALIGN SZ_64K
/*
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index b6abc852f2a1..6f4b3ea359db 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -17,6 +17,9 @@
#include <asm/efi.h>
+/* we will fill this structure from the stub, so don't put it in .bss */
+struct screen_info screen_info __section(.data);
+
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
{
pteval_t prot_val;
diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
index 5e360ce88f10..1428849aece8 100644
--- a/arch/arm64/kernel/image.h
+++ b/arch/arm64/kernel/image.h
@@ -112,6 +112,7 @@ __efistub___memset = KALLSYMS_HIDE(__pi_memset);
__efistub__text = KALLSYMS_HIDE(_text);
__efistub__end = KALLSYMS_HIDE(_end);
__efistub__edata = KALLSYMS_HIDE(_edata);
+__efistub_screen_info = KALLSYMS_HIDE(screen_info);
#endif
--
2.5.0
--
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