diff options
Diffstat (limited to 'arch/x86/include/uapi/asm/e820.h')
-rw-r--r-- | arch/x86/include/uapi/asm/e820.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/x86/include/uapi/asm/e820.h b/arch/x86/include/uapi/asm/e820.h new file mode 100644 index 000000000000..bbae02470701 --- /dev/null +++ b/arch/x86/include/uapi/asm/e820.h | |||
@@ -0,0 +1,75 @@ | |||
1 | #ifndef _UAPI_ASM_X86_E820_H | ||
2 | #define _UAPI_ASM_X86_E820_H | ||
3 | #define E820MAP 0x2d0 /* our map */ | ||
4 | #define E820MAX 128 /* number of entries in E820MAP */ | ||
5 | |||
6 | /* | ||
7 | * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the | ||
8 | * constrained space in the zeropage. If we have more nodes than | ||
9 | * that, and if we've booted off EFI firmware, then the EFI tables | ||
10 | * passed us from the EFI firmware can list more nodes. Size our | ||
11 | * internal memory map tables to have room for these additional | ||
12 | * nodes, based on up to three entries per node for which the | ||
13 | * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), | ||
14 | * plus E820MAX, allowing space for the possible duplicate E820 | ||
15 | * entries that might need room in the same arrays, prior to the | ||
16 | * call to sanitize_e820_map() to remove duplicates. The allowance | ||
17 | * of three memory map entries per node is "enough" entries for | ||
18 | * the initial hardware platform motivating this mechanism to make | ||
19 | * use of additional EFI map entries. Future platforms may want | ||
20 | * to allow more than three entries per node or otherwise refine | ||
21 | * this size. | ||
22 | */ | ||
23 | |||
24 | /* | ||
25 | * Odd: 'make headers_check' complains about numa.h if I try | ||
26 | * to collapse the next two #ifdef lines to a single line: | ||
27 | * #if defined(__KERNEL__) && defined(CONFIG_EFI) | ||
28 | */ | ||
29 | #ifndef __KERNEL__ | ||
30 | #define E820_X_MAX E820MAX | ||
31 | #endif | ||
32 | |||
33 | #define E820NR 0x1e8 /* # entries in E820MAP */ | ||
34 | |||
35 | #define E820_RAM 1 | ||
36 | #define E820_RESERVED 2 | ||
37 | #define E820_ACPI 3 | ||
38 | #define E820_NVS 4 | ||
39 | #define E820_UNUSABLE 5 | ||
40 | |||
41 | |||
42 | /* | ||
43 | * reserved RAM used by kernel itself | ||
44 | * if CONFIG_INTEL_TXT is enabled, memory of this type will be | ||
45 | * included in the S3 integrity calculation and so should not include | ||
46 | * any memory that BIOS might alter over the S3 transition | ||
47 | */ | ||
48 | #define E820_RESERVED_KERN 128 | ||
49 | |||
50 | #ifndef __ASSEMBLY__ | ||
51 | #include <linux/types.h> | ||
52 | struct e820entry { | ||
53 | __u64 addr; /* start of memory segment */ | ||
54 | __u64 size; /* size of memory segment */ | ||
55 | __u32 type; /* type of memory segment */ | ||
56 | } __attribute__((packed)); | ||
57 | |||
58 | struct e820map { | ||
59 | __u32 nr_map; | ||
60 | struct e820entry map[E820_X_MAX]; | ||
61 | }; | ||
62 | |||
63 | #define ISA_START_ADDRESS 0xa0000 | ||
64 | #define ISA_END_ADDRESS 0x100000 | ||
65 | |||
66 | #define BIOS_BEGIN 0x000a0000 | ||
67 | #define BIOS_END 0x00100000 | ||
68 | |||
69 | #define BIOS_ROM_BASE 0xffe00000 | ||
70 | #define BIOS_ROM_END 0xffffffff | ||
71 | |||
72 | #endif /* __ASSEMBLY__ */ | ||
73 | |||
74 | |||
75 | #endif /* _UAPI_ASM_X86_E820_H */ | ||