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efi: Introduce efi_early_memdesc_ptr to get pointer to memmap descriptor

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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>
This commit is contained in:
Baoquan He
2017-08-16 21:46:51 +08:00
committed by Ingo Molnar
parent 2257e268b1
commit 02e43c2dcd
3 changed files with 25 additions and 3 deletions
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4
drivers/firmware/efi/libstub/efi-stub-helper.c
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@@ -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;