/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _ASM_X86_E820_H #define _ASM_X86_E820_H #define E820MAP 0x2d0 /* our map */ #define E820MAX 128 /* number of entries in E820MAP */ /* * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the * constrained space in the zeropage. If we have more nodes than * that, and if we've booted off EFI firmware, then the EFI tables * passed us from the EFI firmware can list more nodes. Size our * internal memory map tables to have room for these additional * nodes, based on up to three entries per node for which the * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), * plus E820MAX, allowing space for the possible duplicate E820 * entries that might need room in the same arrays, prior to the * call to sanitize_e820_map() to remove duplicates. The allowance * of three memory map entries per node is "enough" entries for * the initial hardware platform motivating this mechanism to make * use of additional EFI map entries. Future platforms may want * to allow more than three entries per node or otherwise refine * this size. */ #define E820_X_MAX E820MAX #define E820NR 0x1e8 /* # entries in E820MAP */ #define E820_RAM 1 #define E820_RESERVED 2 #define E820_ACPI 3 #define E820_NVS 4 #define E820_UNUSABLE 5 #define E820_PMEM 7 /* * This is a non-standardized way to represent ADR or NVDIMM regions that * persist over a reboot. The kernel will ignore their special capabilities * unless the CONFIG_X86_PMEM_LEGACY option is set. * * ( Note that older platforms also used 6 for the same type of memory, * but newer versions switched to 12 as 6 was assigned differently. Some * time they will learn... ) */ #define E820_PRAM 12 /* * reserved RAM used by kernel itself * if CONFIG_INTEL_TXT is enabled, memory of this type will be * included in the S3 integrity calculation and so should not include * any memory that BIOS might alter over the S3 transition */ #define E820_RESERVED_KERN 128 #ifndef __ASSEMBLY__ #include <linux/types.h> struct e820entry { __u64 addr; /* start of memory segment */ __u64 size; /* size of memory segment */ __u32 type; /* type of memory segment */ } __attribute__((packed)); struct e820map { __u32 nr_map; struct e820entry map[E820_X_MAX]; }; #define ISA_START_ADDRESS 0xa0000 #define ISA_END_ADDRESS 0x100000 #define BIOS_BEGIN 0x000a0000 #define BIOS_END 0x00100000 #define BIOS_ROM_BASE 0xffe00000 #define BIOS_ROM_END 0xffffffff #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_E820_H */

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