/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _ASM_X86_E820_H

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#define _ASM_X86_E820_H

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#define E820MAP 0x2d0 /* our map */

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#define E820MAX 128 /* number of entries in E820MAP */

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/*

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* Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the

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* constrained space in the zeropage. If we have more nodes than

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* that, and if we've booted off EFI firmware, then the EFI tables

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* passed us from the EFI firmware can list more nodes. Size our

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* internal memory map tables to have room for these additional

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* nodes, based on up to three entries per node for which the

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* kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),

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* plus E820MAX, allowing space for the possible duplicate E820

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* entries that might need room in the same arrays, prior to the

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* call to sanitize_e820_map() to remove duplicates. The allowance

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* of three memory map entries per node is "enough" entries for

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* the initial hardware platform motivating this mechanism to make

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* use of additional EFI map entries. Future platforms may want

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* to allow more than three entries per node or otherwise refine

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* this size.

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*/

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#define E820_X_MAX E820MAX

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#define E820NR 0x1e8 /* # entries in E820MAP */

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#define E820_RAM 1

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#define E820_RESERVED 2

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#define E820_ACPI 3

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#define E820_NVS 4

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#define E820_UNUSABLE 5

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#define E820_PMEM 7

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/*

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* This is a non-standardized way to represent ADR or NVDIMM regions that

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* persist over a reboot. The kernel will ignore their special capabilities

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* unless the CONFIG_X86_PMEM_LEGACY option is set.

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*

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* ( Note that older platforms also used 6 for the same type of memory,

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* but newer versions switched to 12 as 6 was assigned differently. Some

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* time they will learn... )

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*/

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#define E820_PRAM 12

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/*

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* reserved RAM used by kernel itself

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* if CONFIG_INTEL_TXT is enabled, memory of this type will be

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* included in the S3 integrity calculation and so should not include

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* any memory that BIOS might alter over the S3 transition

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*/

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#define E820_RESERVED_KERN 128

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#ifndef __ASSEMBLY__

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#include <linux/types.h>

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struct e820entry {

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__u64 addr; /* start of memory segment */

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__u64 size; /* size of memory segment */

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__u32 type; /* type of memory segment */

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} __attribute__((packed));

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struct e820map {

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__u32 nr_map;

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struct e820entry map[E820_X_MAX];

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};

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#define ISA_START_ADDRESS 0xa0000

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#define ISA_END_ADDRESS 0x100000

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#define BIOS_BEGIN 0x000a0000

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#define BIOS_END 0x00100000

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#define BIOS_ROM_BASE 0xffe00000

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#define BIOS_ROM_END 0xffffffff

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#endif /* __ASSEMBLY__ */

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#endif /* _ASM_X86_E820_H */

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