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01: #ifndef _ASM_X86_E820_H
02: #define _ASM_X86_E820_H
03: #define E820MAP 0x2d0           /* our map */
04: #define E820MAX 128             /* number of entries in E820MAP */
05: 
06: /*
07:  * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
08:  * constrained space in the zeropage.  If we have more nodes than
09:  * 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: #define E820_X_MAX E820MAX
30: 
31: #define E820NR  0x1e8           /* # entries in E820MAP */
32: 
33: #define E820_RAM        1
34: #define E820_RESERVED   2
35: #define E820_ACPI       3
36: #define E820_NVS        4
37: #define E820_UNUSABLE   5
38: 
39: /*
40:  * reserved RAM used by kernel itself
41:  * if CONFIG_INTEL_TXT is enabled, memory of this type will be
42:  * included in the S3 integrity calculation and so should not include
43:  * any memory that BIOS might alter over the S3 transition
44:  */
45: #define E820_RESERVED_KERN        128
46: 
47: #ifndef __ASSEMBLY__
48: #include <linux/types.h>
49: struct e820entry {
50:         __u64 addr;     /* start of memory segment */
51:         __u64 size;     /* size of memory segment */
52:         __u32 type;     /* type of memory segment */
53: } __attribute__((packed));
54: 
55: struct e820map {
56:         __u32 nr_map;
57:         struct e820entry map[E820_X_MAX];
58: };
59: 
60: #define ISA_START_ADDRESS       0xa0000
61: #define ISA_END_ADDRESS         0x100000
62: 
63: #define BIOS_BEGIN              0x000a0000
64: #define BIOS_END                0x00100000
65: 
66: #define BIOS_ROM_BASE           0xffe00000
67: #define BIOS_ROM_END            0xffffffff
68: 
69: #endif /* __ASSEMBLY__ */
70: 
71: 
72: #endif /* _ASM_X86_E820_H */
73: 

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