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authorMatt Fleming <matt@codeblueprint.co.uk>2016-02-27 00:22:05 +0300
committerMatt Fleming <matt@codeblueprint.co.uk>2016-09-09 18:06:38 +0300
commit9479c7cebfb568f8b8b424be7f1cac120e9eea95 (patch)
tree90a40ceceff077b75701672244ec4a51c9e707c1 /include/linux/efi.h
parentab72a27da4c6c19b0e3d6d7556fdd4afb581c8ac (diff)
downloadlinux-9479c7cebfb568f8b8b424be7f1cac120e9eea95.tar.xz
efi: Refactor efi_memmap_init_early() into arch-neutral code
Every EFI architecture apart from ia64 needs to setup the EFI memory map at efi.memmap, and the code for doing that is essentially the same across all implementations. Therefore, it makes sense to factor this out into the common code under drivers/firmware/efi/. The only slight variation is the data structure out of which we pull the initial memory map information, such as physical address, memory descriptor size and version, etc. We can address this by passing a generic data structure (struct efi_memory_map_data) as the argument to efi_memmap_init_early() which contains the minimum info required for initialising the memory map. In the process, this patch also fixes a few undesirable implementation differences: - ARM and arm64 were failing to clear the EFI_MEMMAP bit when unmapping the early EFI memory map. EFI_MEMMAP indicates whether the EFI memory map is mapped (not the regions contained within) and can be traversed. It's more correct to set the bit as soon as we memremap() the passed in EFI memmap. - Rename efi_unmmap_memmap() to efi_memmap_unmap() to adhere to the regular naming scheme. This patch also uses a read-write mapping for the memory map instead of the read-only mapping currently used on ARM and arm64. x86 needs the ability to update the memory map in-place when assigning virtual addresses to regions (efi_map_region()) and tagging regions when reserving boot services (efi_reserve_boot_services()). There's no way for the generic fake_mem code to know which mapping to use without introducing some arch-specific constant/hook, so just use read-write since read-only is of dubious value for the EFI memory map. Tested-by: Dave Young <dyoung@redhat.com> [kexec/kdump] Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [arm] Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Peter Jones <pjones@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Diffstat (limited to 'include/linux/efi.h')
-rw-r--r--include/linux/efi.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7f5a58225385..d862d4998580 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -669,6 +669,18 @@ typedef struct {
unsigned long tables;
} efi_system_table_t;
+/*
+ * Architecture independent structure for describing a memory map for the
+ * benefit of efi_memmap_init_early(), saving us the need to pass four
+ * parameters.
+ */
+struct efi_memory_map_data {
+ phys_addr_t phys_map;
+ unsigned long size;
+ unsigned long desc_version;
+ unsigned long desc_size;
+};
+
struct efi_memory_map {
phys_addr_t phys_map;
void *map;
@@ -900,6 +912,10 @@ static inline efi_status_t efi_query_variable_store(u32 attributes,
}
#endif
extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
+
+extern int __init efi_memmap_init_early(struct efi_memory_map_data *data);
+extern void __init efi_memmap_unmap(void);
+
extern int efi_config_init(efi_config_table_type_t *arch_tables);
#ifdef CONFIG_EFI_ESRT
extern void __init efi_esrt_init(void);