forked from pool/grub2
66 lines
2.2 KiB
Diff
66 lines
2.2 KiB
Diff
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From 6ca50ac741b8c826f953b0905d736006b895f912 Mon Sep 17 00:00:00 2001
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From: Leif Lindholm <leif.lindholm@linaro.org>
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Date: Mon, 9 Jul 2018 18:33:00 +0100
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Subject: [PATCH 4/6] efi: Add central copy of grub_efi_find_mmap_size
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There are several implementations of this function in the tree.
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Add a central version in grub-core/efi/mm.c.
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Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/kern/efi/mm.c | 24 ++++++++++++++++++++++++
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include/grub/efi/efi.h | 1 +
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2 files changed, 25 insertions(+)
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diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
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index 4226f34ec..021d750b6 100644
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--- a/grub-core/kern/efi/mm.c
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+++ b/grub-core/kern/efi/mm.c
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@@ -315,6 +315,30 @@ grub_efi_finish_boot_services (grub_efi_uintn_t *outbuf_size, void *outbuf,
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return GRUB_ERR_NONE;
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}
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+/*
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+ * To obtain the UEFI memory map, we must pass a buffer of sufficient size
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+ * to hold the entire map. This function returns a sane start value for
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+ * buffer size.
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+ */
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+grub_efi_uintn_t
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+grub_efi_find_mmap_size (void)
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+{
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+ grub_efi_uintn_t mmap_size = 0;
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+ grub_efi_uintn_t desc_size;
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+
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+ if (grub_efi_get_memory_map (&mmap_size, NULL, NULL, &desc_size, 0) < 0)
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+ {
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+ grub_error (GRUB_ERR_IO, "cannot get EFI memory map size");
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+ return 0;
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+ }
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+
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+ /*
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+ * Add an extra page, since UEFI can alter the memory map itself on
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+ * callbacks or explicit calls, including console output.
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+ */
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+ return ALIGN_UP (mmap_size + GRUB_EFI_PAGE_SIZE, GRUB_EFI_PAGE_SIZE);
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+}
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+
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/* Get the memory map as defined in the EFI spec. Return 1 if successful,
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return 0 if partial, or return -1 if an error occurs. */
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int
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diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
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index f68a19de4..e8ae60931 100644
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--- a/include/grub/efi/efi.h
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+++ b/include/grub/efi/efi.h
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@@ -52,6 +52,7 @@ EXPORT_FUNC(grub_efi_allocate_pages_max) (grub_efi_physical_address_t max,
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grub_efi_uintn_t pages);
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void EXPORT_FUNC(grub_efi_free_pages) (grub_efi_physical_address_t address,
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grub_efi_uintn_t pages);
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+grub_efi_uintn_t EXPORT_FUNC(grub_efi_find_mmap_size) (void);
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int
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EXPORT_FUNC(grub_efi_get_memory_map) (grub_efi_uintn_t *memory_map_size,
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grub_efi_memory_descriptor_t *memory_map,
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--
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2.16.4
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