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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-09-24 13:49:52 -0700
committerard <ard.biesheuvel@linaro.org>2015-12-13 19:18:30 +0100
commitda58fb6571bf40e5b2287d6aa3bbca04965f5677 (patch)
treec12a192ebd7969626e4ab79d46360779cd6f9b93 /arch/arm/kernel
parent09414d00a137cf7f42b6dc7415f346258d60e8da (diff)
downloadlinux-da58fb6571bf40e5b2287d6aa3bbca04965f5677.tar.bz2
ARM: wire up UEFI init and runtime support
This adds support to the kernel proper for booting via UEFI. It shares most of the code with arm64, so this patch mostly just wires it up for use with ARM. Note that this does not include the EFI stub, it is added in a subsequent patch. Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/Makefile1
-rw-r--r--arch/arm/kernel/efi.c38
-rw-r--r--arch/arm/kernel/setup.c3
3 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index af9e59bf3831..c90f4a70d646 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -77,6 +77,7 @@ CFLAGS_pj4-cp0.o := -marm
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o
obj-$(CONFIG_VDSO) += vdso.o
+obj-$(CONFIG_EFI) += efi.o
ifneq ($(CONFIG_ARCH_EBSA110),y)
obj-y += io.o
diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c
new file mode 100644
index 000000000000..ff8a9d8acfac
--- /dev/null
+++ b/arch/arm/kernel/efi.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+#include <asm/mach/map.h>
+#include <asm/mmu_context.h>
+
+int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
+{
+ struct map_desc desc = {
+ .virtual = md->virt_addr,
+ .pfn = __phys_to_pfn(md->phys_addr),
+ .length = md->num_pages * EFI_PAGE_SIZE,
+ };
+
+ /*
+ * Order is important here: memory regions may have all of the
+ * bits below set (and usually do), so we check them in order of
+ * preference.
+ */
+ if (md->attribute & EFI_MEMORY_WB)
+ desc.type = MT_MEMORY_RWX;
+ else if (md->attribute & EFI_MEMORY_WT)
+ desc.type = MT_MEMORY_RWX_NONCACHED;
+ else if (md->attribute & EFI_MEMORY_WC)
+ desc.type = MT_DEVICE_WC;
+ else
+ desc.type = MT_DEVICE;
+
+ create_mapping_late(mm, &desc, true);
+ return 0;
+}
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 5df2bca57c42..b341b1c3b2fa 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -7,6 +7,7 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+#include <linux/efi.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
@@ -37,6 +38,7 @@
#include <asm/cp15.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
+#include <asm/efi.h>
#include <asm/elf.h>
#include <asm/early_ioremap.h>
#include <asm/fixmap.h>
@@ -966,6 +968,7 @@ void __init setup_arch(char **cmdline_p)
early_paging_init(mdesc);
#endif
setup_dma_zone(mdesc);
+ efi_init();
sanity_check_meminfo();
arm_memblock_init(mdesc);