GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/x86/lib/e820.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <asm/e820.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Install a default e820 table with 4 entries as follows:
+ *
+ *	0x000000-0x0a0000	Useable RAM
+ *	0x0a0000-0x100000	Reserved for ISA
+ *	0x100000-gd->ram_size	Useable RAM
+ *	CONFIG_PCIE_ECAM_BASE	PCIe ECAM
+ */
+__weak unsigned int install_e820_map(unsigned int max_entries,
+				     struct e820_entry *entries)
+{
+	entries[0].addr = 0;
+	entries[0].size = ISA_START_ADDRESS;
+	entries[0].type = E820_RAM;
+	entries[1].addr = ISA_START_ADDRESS;
+	entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
+	entries[1].type = E820_RESERVED;
+	entries[2].addr = ISA_END_ADDRESS;
+	entries[2].size = gd->ram_size - ISA_END_ADDRESS;
+	entries[2].type = E820_RAM;
+	entries[3].addr = CONFIG_PCIE_ECAM_BASE;
+	entries[3].size = CONFIG_PCIE_ECAM_SIZE;
+	entries[3].type = E820_RESERVED;
+
+	return 4;
+}
+
+#if CONFIG_IS_ENABLED(EFI_LOADER)
+void efi_add_known_memory(void)
+{
+	struct e820_entry e820[E820MAX];
+	unsigned int i, num;
+	u64 start, pages, ram_top;
+	int type;
+
+	num = install_e820_map(ARRAY_SIZE(e820), e820);
+
+	ram_top = (u64)gd->ram_top & ~EFI_PAGE_MASK;
+	if (!ram_top)
+		ram_top = 0x100000000ULL;
+
+	for (i = 0; i < num; ++i) {
+		start = e820[i].addr;
+
+		switch (e820[i].type) {
+		case E820_RAM:
+			type = EFI_CONVENTIONAL_MEMORY;
+			break;
+		case E820_RESERVED:
+			type = EFI_RESERVED_MEMORY_TYPE;
+			break;
+		case E820_ACPI:
+			type = EFI_ACPI_RECLAIM_MEMORY;
+			break;
+		case E820_NVS:
+			type = EFI_ACPI_MEMORY_NVS;
+			break;
+		case E820_UNUSABLE:
+		default:
+			type = EFI_UNUSABLE_MEMORY;
+			break;
+		}
+
+		if (type == EFI_CONVENTIONAL_MEMORY) {
+			efi_add_conventional_memory_map(start,
+							start + e820[i].size,
+							ram_top);
+		} else {
+			pages = ALIGN(e820[i].size, EFI_PAGE_SIZE)
+				>> EFI_PAGE_SHIFT;
+			efi_add_memory_map(start, pages, type, false);
+		}
+	}
+}
+#endif /* CONFIG_IS_ENABLED(EFI_LOADER) */