From 02e43c2dcd3b3cf7244f6dda65a07e8dacadaf8d Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Wed, 16 Aug 2017 21:46:51 +0800 Subject: 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 [ Various improvements to the text. ] Acked-by: Matt Fleming Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner 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 --- drivers/firmware/efi/libstub/efi-stub-helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/firmware') diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index b018436..50a9cab 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; -- cgit v1.1