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authorBaoquan He <bhe@redhat.com>2017-08-16 16:46:51 +0300
committerIngo Molnar <mingo@kernel.org>2017-08-17 11:50:57 +0300
commit02e43c2dcd3b3cf7244f6dda65a07e8dacadaf8d (patch)
treea33b802734e0ee58aa4dd3bd1539bf09b6e22901 /drivers/firmware
parent2257e268b1154966c5b0141b23695db1043ff39d (diff)
downloadlinux-02e43c2dcd3b3cf7244f6dda65a07e8dacadaf8d.tar.xz
efi: Introduce efi_early_memdesc_ptr to get pointer to memmap descriptor
The existing map iteration helper for_each_efi_memory_desc_in_map can only be used after the kernel initializes the EFI subsystem to set up struct efi_memory_map. Before that we also need iterate map descriptors which are stored in several intermediate structures, like struct efi_boot_memmap for arch independent usage and struct efi_info for x86 arch only. Introduce efi_early_memdesc_ptr() to get pointer to a map descriptor, and replace several places where that primitive is open coded. Signed-off-by: Baoquan He <bhe@redhat.com> [ Various improvements to the text. ] Acked-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: ard.biesheuvel@linaro.org Cc: fanc.fnst@cn.fujitsu.com Cc: izumi.taku@jp.fujitsu.com Cc: keescook@chromium.org Cc: linux-efi@vger.kernel.org Cc: n-horiguchi@ah.jp.nec.com Cc: thgarnie@google.com Link: http://lkml.kernel.org/r/20170816134651.GF21273@x1 Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index b0184360efc6..50a9cab5a834 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -205,7 +205,7 @@ again:
unsigned long m = (unsigned long)map;
u64 start, end;
- desc = (efi_memory_desc_t *)(m + (i * desc_size));
+ desc = efi_early_memdesc_ptr(m, desc_size, i);
if (desc->type != EFI_CONVENTIONAL_MEMORY)
continue;
@@ -298,7 +298,7 @@ efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
unsigned long m = (unsigned long)map;
u64 start, end;
- desc = (efi_memory_desc_t *)(m + (i * desc_size));
+ desc = efi_early_memdesc_ptr(m, desc_size, i);
if (desc->type != EFI_CONVENTIONAL_MEMORY)
continue;