| 1 |
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| 2 | #ifndef _ASM_X86_SPARSEMEM_H
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| 3 | #define _ASM_X86_SPARSEMEM_H
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| 4 |
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| 5 | #include <linux/types.h>
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| 6 |
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| 7 | #ifdef CONFIG_SPARSEMEM
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| 8 | |
| 9 | * generic non-linear memory support:
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| 10 | *
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| 11 | * 1) we will not split memory into more chunks than will fit into the flags
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| 12 | * field of the struct page
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| 13 | *
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| 14 | * SECTION_SIZE_BITS 2^n: size of each section
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| 15 | * MAX_PHYSMEM_BITS 2^n: max size of physical address space
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| 16 | *
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| 17 |
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| 18 |
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| 19 | #ifdef CONFIG_X86_32
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| 20 | # ifdef CONFIG_X86_PAE
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| 21 | # define SECTION_SIZE_BITS 29
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| 22 | # define MAX_PHYSMEM_BITS 36
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| 23 | # else
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| 24 | # define SECTION_SIZE_BITS 26
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| 25 | # define MAX_PHYSMEM_BITS 32
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| 26 | # endif
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| 27 | #else
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| 28 | # define SECTION_SIZE_BITS 27
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| 29 | # define MAX_PHYSMEM_BITS (pgtable_l5_enabled() ? 52 : 46)
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| 30 | #endif
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| 31 |
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| 32 | #endif
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| 33 |
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| 34 | #endif
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