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efi: memmap: Move manipulation routines into x86 arch tree
The EFI memory map is a description of the memory layout as provided by the firmware, and only x86 manipulates it in various different ways for its own memory bookkeeping. So let's move the memmap routines that are only used by x86 into the x86 arch tree. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel
parent
4059ba656c
commit
fdc6d38d64
@ -417,6 +417,18 @@ static inline void efi_fake_memmap(void)
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}
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#endif
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extern int __init efi_memmap_alloc(unsigned int num_entries,
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struct efi_memory_map_data *data);
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extern void __efi_memmap_free(u64 phys, unsigned long size,
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unsigned long flags);
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#define __efi_memmap_free __efi_memmap_free
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extern int __init efi_memmap_install(struct efi_memory_map_data *data);
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extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
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struct range *range);
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extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
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void *buf, struct efi_mem_range *mem);
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#define arch_ima_efi_boot_mode \
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({ extern struct boot_params boot_params; boot_params.secure_boot; })
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@ -2,6 +2,7 @@
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KASAN_SANITIZE := n
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GCOV_PROFILE := n
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obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
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obj-$(CONFIG_EFI) += memmap.o quirks.o efi.o efi_$(BITS).o \
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efi_stub_$(BITS).o
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obj-$(CONFIG_EFI_MIXED) += efi_thunk_$(BITS).o
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obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
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236
arch/x86/platform/efi/memmap.c
Normal file
236
arch/x86/platform/efi/memmap.c
Normal file
@ -0,0 +1,236 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Common EFI memory map functions.
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*/
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#define pr_fmt(fmt) "efi: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/efi.h>
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#include <linux/io.h>
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#include <asm/early_ioremap.h>
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#include <asm/efi.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
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{
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return memblock_phys_alloc(size, SMP_CACHE_BYTES);
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}
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static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
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{
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unsigned int order = get_order(size);
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struct page *p = alloc_pages(GFP_KERNEL, order);
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if (!p)
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return 0;
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return PFN_PHYS(page_to_pfn(p));
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}
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void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
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{
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if (flags & EFI_MEMMAP_MEMBLOCK) {
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if (slab_is_available())
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memblock_free_late(phys, size);
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else
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memblock_phys_free(phys, size);
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} else if (flags & EFI_MEMMAP_SLAB) {
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struct page *p = pfn_to_page(PHYS_PFN(phys));
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unsigned int order = get_order(size);
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free_pages((unsigned long) page_address(p), order);
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}
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}
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/**
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* efi_memmap_alloc - Allocate memory for the EFI memory map
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* @num_entries: Number of entries in the allocated map.
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* @data: efi memmap installation parameters
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*
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* Depending on whether mm_init() has already been invoked or not,
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* either memblock or "normal" page allocation is used.
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*
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* Returns zero on success, a negative error code on failure.
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*/
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int __init efi_memmap_alloc(unsigned int num_entries,
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struct efi_memory_map_data *data)
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{
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/* Expect allocation parameters are zero initialized */
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WARN_ON(data->phys_map || data->size);
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data->size = num_entries * efi.memmap.desc_size;
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data->desc_version = efi.memmap.desc_version;
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data->desc_size = efi.memmap.desc_size;
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data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);
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data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;
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if (slab_is_available()) {
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data->flags |= EFI_MEMMAP_SLAB;
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data->phys_map = __efi_memmap_alloc_late(data->size);
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} else {
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data->flags |= EFI_MEMMAP_MEMBLOCK;
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data->phys_map = __efi_memmap_alloc_early(data->size);
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}
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if (!data->phys_map)
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return -ENOMEM;
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return 0;
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}
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/**
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* efi_memmap_install - Install a new EFI memory map in efi.memmap
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* @ctx: map allocation parameters (address, size, flags)
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*
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* Unlike efi_memmap_init_*(), this function does not allow the caller
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* to switch from early to late mappings. It simply uses the existing
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* mapping function and installs the new memmap.
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*
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* Returns zero on success, a negative error code on failure.
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*/
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int __init efi_memmap_install(struct efi_memory_map_data *data)
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{
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efi_memmap_unmap();
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return __efi_memmap_init(data);
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}
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/**
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* efi_memmap_split_count - Count number of additional EFI memmap entries
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* @md: EFI memory descriptor to split
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* @range: Address range (start, end) to split around
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*
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* Returns the number of additional EFI memmap entries required to
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* accommodate @range.
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*/
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int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
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{
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u64 m_start, m_end;
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u64 start, end;
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int count = 0;
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start = md->phys_addr;
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end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
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/* modifying range */
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m_start = range->start;
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m_end = range->end;
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if (m_start <= start) {
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/* split into 2 parts */
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if (start < m_end && m_end < end)
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count++;
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}
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if (start < m_start && m_start < end) {
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/* split into 3 parts */
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if (m_end < end)
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count += 2;
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/* split into 2 parts */
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if (end <= m_end)
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count++;
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}
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return count;
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}
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/**
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* efi_memmap_insert - Insert a memory region in an EFI memmap
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* @old_memmap: The existing EFI memory map structure
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* @buf: Address of buffer to store new map
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* @mem: Memory map entry to insert
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*
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* It is suggested that you call efi_memmap_split_count() first
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* to see how large @buf needs to be.
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*/
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void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
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struct efi_mem_range *mem)
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{
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u64 m_start, m_end, m_attr;
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efi_memory_desc_t *md;
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u64 start, end;
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void *old, *new;
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/* modifying range */
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m_start = mem->range.start;
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m_end = mem->range.end;
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m_attr = mem->attribute;
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/*
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* The EFI memory map deals with regions in EFI_PAGE_SIZE
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* units. Ensure that the region described by 'mem' is aligned
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* correctly.
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*/
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if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
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!IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
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WARN_ON(1);
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return;
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}
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for (old = old_memmap->map, new = buf;
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old < old_memmap->map_end;
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old += old_memmap->desc_size, new += old_memmap->desc_size) {
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/* copy original EFI memory descriptor */
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memcpy(new, old, old_memmap->desc_size);
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md = new;
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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 <= start && end <= m_end)
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md->attribute |= m_attr;
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if (m_start <= start &&
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(start < m_end && m_end < end)) {
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/* first part */
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md->attribute |= m_attr;
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md->num_pages = (m_end - md->phys_addr + 1) >>
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EFI_PAGE_SHIFT;
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/* latter part */
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new += old_memmap->desc_size;
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memcpy(new, old, old_memmap->desc_size);
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md = new;
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md->phys_addr = m_end + 1;
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md->num_pages = (end - md->phys_addr + 1) >>
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EFI_PAGE_SHIFT;
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}
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if ((start < m_start && m_start < end) && m_end < end) {
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/* first part */
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md->num_pages = (m_start - md->phys_addr) >>
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EFI_PAGE_SHIFT;
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/* middle part */
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new += old_memmap->desc_size;
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memcpy(new, old, old_memmap->desc_size);
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md = new;
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md->attribute |= m_attr;
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md->phys_addr = m_start;
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md->num_pages = (m_end - m_start + 1) >>
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EFI_PAGE_SHIFT;
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/* last part */
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new += old_memmap->desc_size;
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memcpy(new, old, old_memmap->desc_size);
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md = new;
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md->phys_addr = m_end + 1;
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md->num_pages = (end - m_end) >>
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EFI_PAGE_SHIFT;
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}
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if ((start < m_start && m_start < end) &&
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(end <= m_end)) {
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/* first part */
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md->num_pages = (m_start - md->phys_addr) >>
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EFI_PAGE_SHIFT;
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/* latter part */
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new += old_memmap->desc_size;
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memcpy(new, old, old_memmap->desc_size);
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md = new;
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md->phys_addr = m_start;
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md->num_pages = (end - md->phys_addr + 1) >>
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EFI_PAGE_SHIFT;
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md->attribute |= m_attr;
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}
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}
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}
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@ -9,82 +9,15 @@
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#include <linux/kernel.h>
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#include <linux/efi.h>
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#include <linux/io.h>
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#include <asm/early_ioremap.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
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{
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return memblock_phys_alloc(size, SMP_CACHE_BYTES);
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}
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#include <asm/early_ioremap.h>
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#include <asm/efi.h>
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static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
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{
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unsigned int order = get_order(size);
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struct page *p = alloc_pages(GFP_KERNEL, order);
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if (!p)
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return 0;
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return PFN_PHYS(page_to_pfn(p));
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}
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void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
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{
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if (flags & EFI_MEMMAP_MEMBLOCK) {
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if (slab_is_available())
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memblock_free_late(phys, size);
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else
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memblock_phys_free(phys, size);
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} else if (flags & EFI_MEMMAP_SLAB) {
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struct page *p = pfn_to_page(PHYS_PFN(phys));
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unsigned int order = get_order(size);
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free_pages((unsigned long) page_address(p), order);
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}
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}
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static void __init efi_memmap_free(void)
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{
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__efi_memmap_free(efi.memmap.phys_map,
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efi.memmap.desc_size * efi.memmap.nr_map,
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efi.memmap.flags);
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}
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/**
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* efi_memmap_alloc - Allocate memory for the EFI memory map
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* @num_entries: Number of entries in the allocated map.
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* @data: efi memmap installation parameters
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*
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* Depending on whether mm_init() has already been invoked or not,
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* either memblock or "normal" page allocation is used.
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*
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* Returns zero on success, a negative error code on failure.
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*/
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int __init efi_memmap_alloc(unsigned int num_entries,
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struct efi_memory_map_data *data)
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{
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/* Expect allocation parameters are zero initialized */
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WARN_ON(data->phys_map || data->size);
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data->size = num_entries * efi.memmap.desc_size;
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data->desc_version = efi.memmap.desc_version;
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data->desc_size = efi.memmap.desc_size;
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data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);
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data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;
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if (slab_is_available()) {
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data->flags |= EFI_MEMMAP_SLAB;
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data->phys_map = __efi_memmap_alloc_late(data->size);
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} else {
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data->flags |= EFI_MEMMAP_MEMBLOCK;
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data->phys_map = __efi_memmap_alloc_early(data->size);
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}
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if (!data->phys_map)
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return -ENOMEM;
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return 0;
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}
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#ifndef __efi_memmap_free
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#define __efi_memmap_free(phys, size, flags) do { } while (0)
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#endif
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/**
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* __efi_memmap_init - Common code for mapping the EFI memory map
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@ -101,7 +34,7 @@ int __init efi_memmap_alloc(unsigned int num_entries,
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*
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* Returns zero on success, a negative error code on failure.
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*/
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static int __init __efi_memmap_init(struct efi_memory_map_data *data)
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int __init __efi_memmap_init(struct efi_memory_map_data *data)
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{
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struct efi_memory_map map;
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phys_addr_t phys_map;
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@ -121,8 +54,10 @@ static int __init __efi_memmap_init(struct efi_memory_map_data *data)
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return -ENOMEM;
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}
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/* NOP if data->flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB) == 0 */
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efi_memmap_free();
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if (efi.memmap.flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB))
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__efi_memmap_free(efi.memmap.phys_map,
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efi.memmap.desc_size * efi.memmap.nr_map,
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efi.memmap.flags);
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map.phys_map = data->phys_map;
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map.nr_map = data->size / data->desc_size;
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@ -220,158 +155,3 @@ int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size)
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return __efi_memmap_init(&data);
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}
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/**
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* efi_memmap_install - Install a new EFI memory map in efi.memmap
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* @ctx: map allocation parameters (address, size, flags)
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*
|
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* Unlike efi_memmap_init_*(), this function does not allow the caller
|
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* to switch from early to late mappings. It simply uses the existing
|
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* mapping function and installs the new memmap.
|
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*
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* Returns zero on success, a negative error code on failure.
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*/
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int __init efi_memmap_install(struct efi_memory_map_data *data)
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{
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efi_memmap_unmap();
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return __efi_memmap_init(data);
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}
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/**
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* efi_memmap_split_count - Count number of additional EFI memmap entries
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* @md: EFI memory descriptor to split
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* @range: Address range (start, end) to split around
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*
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* Returns the number of additional EFI memmap entries required to
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* accommodate @range.
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*/
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int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
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{
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u64 m_start, m_end;
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u64 start, end;
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int count = 0;
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start = md->phys_addr;
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end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
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/* modifying range */
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m_start = range->start;
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m_end = range->end;
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if (m_start <= start) {
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/* split into 2 parts */
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if (start < m_end && m_end < end)
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count++;
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}
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if (start < m_start && m_start < end) {
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/* split into 3 parts */
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if (m_end < end)
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count += 2;
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/* split into 2 parts */
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if (end <= m_end)
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count++;
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}
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return count;
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}
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/**
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* efi_memmap_insert - Insert a memory region in an EFI memmap
|
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* @old_memmap: The existing EFI memory map structure
|
||||
* @buf: Address of buffer to store new map
|
||||
* @mem: Memory map entry to insert
|
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*
|
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* It is suggested that you call efi_memmap_split_count() first
|
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* to see how large @buf needs to be.
|
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*/
|
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void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
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struct efi_mem_range *mem)
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{
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u64 m_start, m_end, m_attr;
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efi_memory_desc_t *md;
|
||||
u64 start, end;
|
||||
void *old, *new;
|
||||
|
||||
/* modifying range */
|
||||
m_start = mem->range.start;
|
||||
m_end = mem->range.end;
|
||||
m_attr = mem->attribute;
|
||||
|
||||
/*
|
||||
* The EFI memory map deals with regions in EFI_PAGE_SIZE
|
||||
* units. Ensure that the region described by 'mem' is aligned
|
||||
* correctly.
|
||||
*/
|
||||
if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
|
||||
!IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
|
||||
WARN_ON(1);
|
||||
return;
|
||||
}
|
||||
|
||||
for (old = old_memmap->map, new = buf;
|
||||
old < old_memmap->map_end;
|
||||
old += old_memmap->desc_size, new += old_memmap->desc_size) {
|
||||
|
||||
/* copy original EFI memory descriptor */
|
||||
memcpy(new, old, old_memmap->desc_size);
|
||||
md = new;
|
||||
start = md->phys_addr;
|
||||
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
|
||||
|
||||
if (m_start <= start && end <= m_end)
|
||||
md->attribute |= m_attr;
|
||||
|
||||
if (m_start <= start &&
|
||||
(start < m_end && m_end < end)) {
|
||||
/* first part */
|
||||
md->attribute |= m_attr;
|
||||
md->num_pages = (m_end - md->phys_addr + 1) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
/* latter part */
|
||||
new += old_memmap->desc_size;
|
||||
memcpy(new, old, old_memmap->desc_size);
|
||||
md = new;
|
||||
md->phys_addr = m_end + 1;
|
||||
md->num_pages = (end - md->phys_addr + 1) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
}
|
||||
|
||||
if ((start < m_start && m_start < end) && m_end < end) {
|
||||
/* first part */
|
||||
md->num_pages = (m_start - md->phys_addr) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
/* middle part */
|
||||
new += old_memmap->desc_size;
|
||||
memcpy(new, old, old_memmap->desc_size);
|
||||
md = new;
|
||||
md->attribute |= m_attr;
|
||||
md->phys_addr = m_start;
|
||||
md->num_pages = (m_end - m_start + 1) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
/* last part */
|
||||
new += old_memmap->desc_size;
|
||||
memcpy(new, old, old_memmap->desc_size);
|
||||
md = new;
|
||||
md->phys_addr = m_end + 1;
|
||||
md->num_pages = (end - m_end) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
}
|
||||
|
||||
if ((start < m_start && m_start < end) &&
|
||||
(end <= m_end)) {
|
||||
/* first part */
|
||||
md->num_pages = (m_start - md->phys_addr) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
/* latter part */
|
||||
new += old_memmap->desc_size;
|
||||
memcpy(new, old, old_memmap->desc_size);
|
||||
md = new;
|
||||
md->phys_addr = m_start;
|
||||
md->num_pages = (end - md->phys_addr + 1) >>
|
||||
EFI_PAGE_SHIFT;
|
||||
md->attribute |= m_attr;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -707,18 +707,10 @@ static inline efi_status_t efi_query_variable_store(u32 attributes,
|
||||
#endif
|
||||
extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
|
||||
|
||||
extern int __init efi_memmap_alloc(unsigned int num_entries,
|
||||
struct efi_memory_map_data *data);
|
||||
extern void __efi_memmap_free(u64 phys, unsigned long size,
|
||||
unsigned long flags);
|
||||
extern int __init __efi_memmap_init(struct efi_memory_map_data *data);
|
||||
extern int __init efi_memmap_init_early(struct efi_memory_map_data *data);
|
||||
extern int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size);
|
||||
extern void __init efi_memmap_unmap(void);
|
||||
extern int __init efi_memmap_install(struct efi_memory_map_data *data);
|
||||
extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
|
||||
struct range *range);
|
||||
extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
|
||||
void *buf, struct efi_mem_range *mem);
|
||||
|
||||
#ifdef CONFIG_EFI_ESRT
|
||||
extern void __init efi_esrt_init(void);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user