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4056bb42c6
It is used to specify the maximum number of EFI memmap entries. On some platforms, like Tiger Lake, the number of EFI memmap entries becomes 268 when the BIOS settings are changed. The current value of MAX_EFI_MMAP_ENTRIES (256) defined in hypervisor is not big enough to cover such cases. As the number of EFI memmap entries depends on the platforms and the BIOS settings, this patch introduces a new entry MAX_EFI_MMAP_ENTRIES in configurations so that it can be adjusted for different cases. Tracked-On: #6442 Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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* Copyright (C) 2021 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <boot.h>
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#include <efi.h>
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#include <efi_mmap.h>
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#include <logmsg.h>
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static uint16_t hv_memdesc_nr;
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static struct efi_memory_desc hv_memdesc[CONFIG_MAX_EFI_MMAP_ENTRIES];
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static void sort_efi_mmap_entries(void)
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{
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uint32_t i,j;
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struct efi_memory_desc tmp_memdesc;
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/* Bubble sort */
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for (i = 0U; i < (hv_memdesc_nr - 1U); i++) {
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for (j = 0U; j < (hv_memdesc_nr - i - 1U); j++) {
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if (hv_memdesc[j].phys_addr > hv_memdesc[j + 1U].phys_addr) {
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tmp_memdesc = hv_memdesc[j];
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hv_memdesc[j] = hv_memdesc[j + 1U];
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hv_memdesc[j + 1U] = tmp_memdesc;
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}
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}
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}
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}
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void init_efi_mmap_entries(struct efi_info *uefi_info)
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{
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void *efi_memmap = (void *)((uint64_t)uefi_info->memmap | ((uint64_t)uefi_info->memmap_hi << 32U));
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struct efi_memory_desc *efi_memdesc = (struct efi_memory_desc *)efi_memmap;
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uint32_t entry = 0U;
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while ((void *)efi_memdesc < (efi_memmap + uefi_info->memmap_size)) {
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if (entry >= CONFIG_MAX_EFI_MMAP_ENTRIES) {
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pr_err("Too many efi memmap entries, entries up %d are ignored.", CONFIG_MAX_EFI_MMAP_ENTRIES);
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break;
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}
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hv_memdesc[entry] = *efi_memdesc;
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/* Per UEFI spec, EFI_MEMORY_DESCRIPTOR array element returned in MemoryMap.
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* The size is returned to allow for future expansion of the EFI_MEMORY_DESCRIPTOR
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* in response to hardware innovation. The structure of the EFI_MEMORY_DESCRIPTOR
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* may be extended in the future but it will remain backwards compatible with the
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* current definition. Thus OS software must use the DescriptorSize to find the
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* start of each EFI_MEMORY_DESCRIPTOR in the MemoryMap array.
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*/
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efi_memdesc = (struct efi_memory_desc *)((void *)efi_memdesc + uefi_info->memdesc_size);
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entry ++;
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}
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hv_memdesc_nr = entry;
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sort_efi_mmap_entries();
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}
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uint32_t get_efi_mmap_entries_count(void)
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{
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return hv_memdesc_nr;
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}
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const struct efi_memory_desc *get_efi_mmap_entry(void)
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{
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return hv_memdesc;
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}
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