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82 lines
2.6 KiB
82 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_ASM_X86_E820_H |
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#define _UAPI_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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#ifndef __KERNEL__ |
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#define E820_X_MAX E820MAX |
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#endif |
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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 /* _UAPI_ASM_X86_E820_H */
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