76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2019 Intel Corporation. All rights reserved. */
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#include <linux/efi.h>
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#include <asm/e820/api.h>
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#include "fake_mem.h"
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void __init efi_fake_memmap_early(void)
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{
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int i;
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/*
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* The late efi_fake_mem() call can handle all requests if
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* EFI_MEMORY_SP support is disabled.
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*/
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if (!efi_soft_reserve_enabled())
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return;
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if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
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return;
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/*
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* Given that efi_fake_memmap() needs to perform memblock
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* allocations it needs to run after e820__memblock_setup().
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* However, if efi_fake_mem specifies EFI_MEMORY_SP for a given
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* address range that potentially needs to mark the memory as
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* reserved prior to e820__memblock_setup(). Update e820
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* directly if EFI_MEMORY_SP is specified for an
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* EFI_CONVENTIONAL_MEMORY descriptor.
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*/
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for (i = 0; i < nr_fake_mem; i++) {
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struct efi_mem_range *mem = &efi_fake_mems[i];
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efi_memory_desc_t *md;
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u64 m_start, m_end;
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if ((mem->attribute & EFI_MEMORY_SP) == 0)
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continue;
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m_start = mem->range.start;
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m_end = mem->range.end;
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for_each_efi_memory_desc(md) {
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u64 start, end, size;
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if (md->type != EFI_CONVENTIONAL_MEMORY)
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continue;
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start = md->phys_addr;
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end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
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if (m_start <= end && m_end >= start)
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/* fake range overlaps descriptor */;
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else
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continue;
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/*
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* Trim the boundary of the e820 update to the
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* descriptor in case the fake range overlaps
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* !EFI_CONVENTIONAL_MEMORY
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*/
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start = max(start, m_start);
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end = min(end, m_end);
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size = end - start + 1;
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if (end <= start)
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continue;
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/*
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* Ensure each efi_fake_mem instance results in
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* a unique e820 resource
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*/
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e820__range_remove(start, size, E820_TYPE_RAM, 1);
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e820__range_add(start, size, E820_TYPE_SOFT_RESERVED);
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e820__update_table(e820_table);
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}
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}
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}
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