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