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| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
|---|---|
| 2 | #ifndef _UAPI_ASM_X86_E820_H |
| 3 | #define _UAPI_ASM_X86_E820_H |
| 4 | #define E820MAP 0x2d0 /* our map */ |
| 5 | #define E820MAX 128 /* number of entries in E820MAP */ |
| 6 | |
| 7 | /* |
| 8 | * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the |
| 9 | * constrained space in the zeropage. If we have more nodes than |
| 10 | * that, and if we've booted off EFI firmware, then the EFI tables |
| 11 | * passed us from the EFI firmware can list more nodes. Size our |
| 12 | * internal memory map tables to have room for these additional |
| 13 | * nodes, based on up to three entries per node for which the |
| 14 | * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), |
| 15 | * plus E820MAX, allowing space for the possible duplicate E820 |
| 16 | * entries that might need room in the same arrays, prior to the |
| 17 | * call to sanitize_e820_map() to remove duplicates. The allowance |
| 18 | * of three memory map entries per node is "enough" entries for |
| 19 | * the initial hardware platform motivating this mechanism to make |
| 20 | * use of additional EFI map entries. Future platforms may want |
| 21 | * to allow more than three entries per node or otherwise refine |
| 22 | * this size. |
| 23 | */ |
| 24 | |
| 25 | #ifndef __KERNEL__ |
| 26 | #define E820_X_MAX E820MAX |
| 27 | #endif |
| 28 | |
| 29 | #define E820NR 0x1e8 /* # entries in E820MAP */ |
| 30 | |
| 31 | #define E820_RAM 1 |
| 32 | #define E820_RESERVED 2 |
| 33 | #define E820_ACPI 3 |
| 34 | #define E820_NVS 4 |
| 35 | #define E820_UNUSABLE 5 |
| 36 | #define E820_PMEM 7 |
| 37 | |
| 38 | /* |
| 39 | * This is a non-standardized way to represent ADR or NVDIMM regions that |
| 40 | * persist over a reboot. The kernel will ignore their special capabilities |
| 41 | * unless the CONFIG_X86_PMEM_LEGACY option is set. |
| 42 | * |
| 43 | * ( Note that older platforms also used 6 for the same type of memory, |
| 44 | * but newer versions switched to 12 as 6 was assigned differently. Some |
| 45 | * time they will learn... ) |
| 46 | */ |
| 47 | #define E820_PRAM 12 |
| 48 | |
| 49 | /* |
| 50 | * reserved RAM used by kernel itself |
| 51 | * if CONFIG_INTEL_TXT is enabled, memory of this type will be |
| 52 | * included in the S3 integrity calculation and so should not include |
| 53 | * any memory that BIOS might alter over the S3 transition |
| 54 | */ |
| 55 | #define E820_RESERVED_KERN 128 |
| 56 | |
| 57 | #ifndef __ASSEMBLY__ |
| 58 | #include <linux/types.h> |
| 59 | struct e820entry { |
| 60 | __u64 addr; /* start of memory segment */ |
| 61 | __u64 size; /* size of memory segment */ |
| 62 | __u32 type; /* type of memory segment */ |
| 63 | } __attribute__((packed)); |
| 64 | |
| 65 | struct e820map { |
| 66 | __u32 nr_map; |
| 67 | struct e820entry map[E820_X_MAX]; |
| 68 | }; |
| 69 | |
| 70 | #define ISA_START_ADDRESS 0xa0000 |
| 71 | #define ISA_END_ADDRESS 0x100000 |
| 72 | |
| 73 | #define BIOS_BEGIN 0x000a0000 |
| 74 | #define BIOS_END 0x00100000 |
| 75 | |
| 76 | #define BIOS_ROM_BASE 0xffe00000 |
| 77 | #define BIOS_ROM_END 0xffffffff |
| 78 | |
| 79 | #endif /* __ASSEMBLY__ */ |
| 80 | |
| 81 | |
| 82 | #endif /* _UAPI_ASM_X86_E820_H */ |
| 83 |
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