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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3262 | Serge | 1 | #ifndef _LINUX_MM_H |
| 2 | #define _LINUX_MM_H |
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| 3243 | Serge | 3 | |
| 3747 | Serge | 4 | #include |
| 3262 | Serge | 5 | |
| 6 | #define VM_NORESERVE 0x00200000 |
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| 3747 | Serge | 7 | |
| 8 | #define nth_page(page,n) ((void*)(((page_to_phys(page)>>12)+(n))<<12)) |
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| 9 | |||
| 10 | #define page_to_pfn(page) (page_to_phys(page)>>12) |
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| 11 | |||
| 12 | /* to align the pointer to the (next) page boundary */ |
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| 3262 | Serge | 13 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| 14 | |||
| 4559 | Serge | 15 | /* |
| 16 | * These are the virtual MM functions - opening of an area, closing and |
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| 17 | * unmapping it (needed to keep files on disk up-to-date etc), pointer |
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| 18 | * to the functions called when a no-page or a wp-page exception occurs. |
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| 19 | */ |
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| 20 | struct vm_operations_struct { |
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| 21 | void (*open)(struct vm_area_struct * area); |
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| 22 | void (*close)(struct vm_area_struct * area); |
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| 23 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
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| 24 | |||
| 25 | /* notification that a previously read-only page is about to become |
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| 26 | * writable, if an error is returned it will cause a SIGBUS */ |
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| 27 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
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| 28 | |||
| 29 | /* called by access_process_vm when get_user_pages() fails, typically |
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| 30 | * for use by special VMAs that can switch between memory and hardware |
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| 31 | */ |
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| 32 | int (*access)(struct vm_area_struct *vma, unsigned long addr, |
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| 33 | void *buf, int len, int write); |
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| 34 | #ifdef CONFIG_NUMA |
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| 35 | /* |
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| 36 | * set_policy() op must add a reference to any non-NULL @new mempolicy |
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| 37 | * to hold the policy upon return. Caller should pass NULL @new to |
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| 38 | * remove a policy and fall back to surrounding context--i.e. do not |
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| 39 | * install a MPOL_DEFAULT policy, nor the task or system default |
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| 40 | * mempolicy. |
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| 41 | */ |
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| 42 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
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| 43 | |||
| 44 | /* |
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| 45 | * get_policy() op must add reference [mpol_get()] to any policy at |
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| 46 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
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| 47 | * in mm/mempolicy.c will do this automatically. |
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| 48 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
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| 49 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. |
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| 50 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
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| 51 | * must return NULL--i.e., do not "fallback" to task or system default |
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| 52 | * policy. |
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| 53 | */ |
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| 54 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
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| 55 | unsigned long addr); |
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| 56 | int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, |
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| 57 | const nodemask_t *to, unsigned long flags); |
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| 58 | #endif |
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| 59 | /* called by sys_remap_file_pages() to populate non-linear mapping */ |
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| 60 | int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr, |
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| 61 | unsigned long size, pgoff_t pgoff); |
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| 62 | }; |
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| 4370 | Serge | 63 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 64 | |||
| 3262 | Serge | 65 | #endif |