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https://github.com/brain-hackers/u-boot-brain
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On x86 traditional E820 table is used to pass the memory information to kernel. With EFI loader we can build the EFI memory map from it. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <efi_loader.h>
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#include <asm/e820.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Install a default e820 table with 4 entries as follows:
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*
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* 0x000000-0x0a0000 Useable RAM
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* 0x0a0000-0x100000 Reserved for ISA
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* 0x100000-gd->ram_size Useable RAM
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* CONFIG_PCIE_ECAM_BASE PCIe ECAM
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*/
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__weak unsigned int install_e820_map(unsigned int max_entries,
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struct e820_entry *entries)
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{
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entries[0].addr = 0;
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entries[0].size = ISA_START_ADDRESS;
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entries[0].type = E820_RAM;
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entries[1].addr = ISA_START_ADDRESS;
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entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
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entries[1].type = E820_RESERVED;
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entries[2].addr = ISA_END_ADDRESS;
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entries[2].size = gd->ram_size - ISA_END_ADDRESS;
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entries[2].type = E820_RAM;
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entries[3].addr = CONFIG_PCIE_ECAM_BASE;
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entries[3].size = CONFIG_PCIE_ECAM_SIZE;
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entries[3].type = E820_RESERVED;
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return 4;
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}
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#if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD)
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void efi_add_known_memory(void)
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{
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struct e820_entry e820[E820MAX];
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unsigned int i, num;
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u64 start, pages;
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int type;
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num = install_e820_map(ARRAY_SIZE(e820), e820);
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for (i = 0; i < num; ++i) {
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start = e820[i].addr;
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pages = ALIGN(e820[i].size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
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switch (e820[i].type) {
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case E820_RAM:
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type = EFI_CONVENTIONAL_MEMORY;
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break;
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case E820_RESERVED:
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type = EFI_RESERVED_MEMORY_TYPE;
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break;
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case E820_ACPI:
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type = EFI_ACPI_RECLAIM_MEMORY;
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break;
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case E820_NVS:
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type = EFI_ACPI_MEMORY_NVS;
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break;
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case E820_UNUSABLE:
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default:
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type = EFI_UNUSABLE_MEMORY;
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break;
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}
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efi_add_memory_map(start, pages, type, false);
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}
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}
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#endif /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
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