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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-11-12 22:32:32 +0100
committerIngo Molnar <mingo@kernel.org>2016-11-13 08:23:15 +0100
commita6a144698db93a2c456d1e3811140cadef1ba0e3 (patch)
tree14b97425f41a7962b887aae89c7c8c909435570f /drivers/firmware/efi/libstub
parentefi: Add support for seeding the RNG from a UEFI config table (diff)
downloadlinux-a6a144698db93a2c456d1e3811140cadef1ba0e3.tar.xz
linux-a6a144698db93a2c456d1e3811140cadef1ba0e3.zip
efi/libstub: Add random.c to ARM build
Make random.c build for ARM by moving the fallback definition of EFI_ALLOC_ALIGN to efistub.h, and replacing a division by a value we know to be a power of 2 with a right shift (this is required since ARM does not have any integer division helper routines in its decompressor) Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20161112213237.8804-5-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/libstub')
-rw-r--r--drivers/firmware/efi/libstub/Makefile4
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c9
-rw-r--r--drivers/firmware/efi/libstub/efistub.h9
-rw-r--r--drivers/firmware/efi/libstub/random.c8
4 files changed, 16 insertions, 14 deletions
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 5e23e2d305e7..6621b13c370f 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -36,11 +36,11 @@ arm-deps := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c sort.c
$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE
$(call if_changed_rule,cc_o_c)
-lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o \
+lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o random.o \
$(patsubst %.c,lib-%.o,$(arm-deps))
lib-$(CONFIG_ARM) += arm32-stub.o
-lib-$(CONFIG_ARM64) += arm64-stub.o random.o
+lib-$(CONFIG_ARM64) += arm64-stub.o
CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
#
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 4b74bf86c74d..757badc1debb 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -32,15 +32,6 @@
static unsigned long __chunk_size = EFI_READ_CHUNK_SIZE;
-/*
- * Allow the platform to override the allocation granularity: this allows
- * systems that have the capability to run with a larger page size to deal
- * with the allocations for initrd and fdt more efficiently.
- */
-#ifndef EFI_ALLOC_ALIGN
-#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
-#endif
-
#define EFI_MMAP_NR_SLACK_SLOTS 8
struct file_info {
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index ee49cd23ee63..fe1f22584c69 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -15,6 +15,15 @@
*/
#undef __init
+/*
+ * Allow the platform to override the allocation granularity: this allows
+ * systems that have the capability to run with a larger page size to deal
+ * with the allocations for initrd and fdt more efficiently.
+ */
+#ifndef EFI_ALLOC_ALIGN
+#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
+#endif
+
void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg, void *__image,
diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c
index 0c9f58c5ba50..f8e2e5ae6872 100644
--- a/drivers/firmware/efi/libstub/random.c
+++ b/drivers/firmware/efi/libstub/random.c
@@ -8,6 +8,7 @@
*/
#include <linux/efi.h>
+#include <linux/log2.h>
#include <asm/efi.h>
#include "efistub.h"
@@ -41,8 +42,9 @@ efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
*/
static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
unsigned long size,
- unsigned long align)
+ unsigned long align_shift)
{
+ unsigned long align = 1UL << align_shift;
u64 start, end;
if (md->type != EFI_CONVENTIONAL_MEMORY)
@@ -55,7 +57,7 @@ static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
if (start > end)
return 0;
- return (end - start + 1) / align;
+ return (end - start + 1) >> align_shift;
}
/*
@@ -98,7 +100,7 @@ efi_status_t efi_random_alloc(efi_system_table_t *sys_table_arg,
efi_memory_desc_t *md = (void *)memory_map + map_offset;
unsigned long slots;
- slots = get_entry_num_slots(md, size, align);
+ slots = get_entry_num_slots(md, size, ilog2(align));
MD_NUM_SLOTS(md) = slots;
total_slots += slots;
}