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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Patrick Steinhardt <ps@pks.im>
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Date: Thu, 21 Apr 2022 15:24:20 +1000
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Subject: [PATCH] kern/efi/mm: Extract function to add memory regions
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In preparation of support for runtime-allocating additional memory
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region, this patch extracts the function to retrieve the EFI memory
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map and add a subset of it to GRUB's own memory regions.
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Signed-off-by: Patrick Steinhardt <ps@pks.im>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Patrick Steinhardt <ps@pks.im>
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(cherry picked from commit 96a7ea29e3cb61b6c2302e260e8e6a6117e17fa3)
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[rharwood: backport around our nx]
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---
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grub-core/kern/efi/mm.c | 21 +++++++++++++++------
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1 file changed, 15 insertions(+), 6 deletions(-)
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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 782a1365a1..a1d3b51fe6 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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@@ -667,8 +667,8 @@ grub_nx_init (void)
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}
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}
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-void
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-grub_efi_mm_init (void)
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+static grub_err_t
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+grub_efi_mm_add_regions (grub_size_t required_bytes)
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{
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grub_efi_memory_descriptor_t *memory_map;
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grub_efi_memory_descriptor_t *memory_map_end;
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@@ -683,7 +683,7 @@ grub_efi_mm_init (void)
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/* Prepare a memory region to store two memory maps. */
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memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
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if (! memory_map)
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- grub_fatal ("cannot allocate memory");
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory for memory map");
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/* Obtain descriptors for available memory. */
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map_size = MEMORY_MAP_SIZE;
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@@ -701,14 +701,14 @@ grub_efi_mm_init (void)
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memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (map_size));
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if (! memory_map)
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- grub_fatal ("cannot allocate memory");
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory for new memory map");
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mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
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&desc_size, 0);
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}
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if (mm_status < 0)
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- grub_fatal ("cannot get memory map");
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+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "error fetching memory map from EFI");
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memory_map_end = NEXT_MEMORY_DESCRIPTOR (memory_map, map_size);
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@@ -723,7 +723,7 @@ grub_efi_mm_init (void)
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/* Allocate memory regions for GRUB's memory management. */
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add_memory_regions (filtered_memory_map, desc_size,
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- filtered_memory_map_end, BYTES_TO_PAGES (DEFAULT_HEAP_SIZE));
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+ filtered_memory_map_end, BYTES_TO_PAGES (required_bytes));
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#if 0
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/* For debug. */
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@@ -741,6 +741,15 @@ grub_efi_mm_init (void)
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/* Release the memory maps. */
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grub_efi_free_pages ((grub_addr_t) memory_map,
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2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+void
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+grub_efi_mm_init (void)
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+{
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+ if (grub_efi_mm_add_regions (DEFAULT_HEAP_SIZE) != GRUB_ERR_NONE)
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+ grub_fatal ("%s", grub_errmsg);
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}
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#if defined (__aarch64__) || defined (__arm__) || defined (__riscv)
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