66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
#ifndef _LINUX_MM_H
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#define _LINUX_MM_H
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#include <linux/errno.h>
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#define VM_NORESERVE 0x00200000
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#define nth_page(page,n) ((void*)(((page_to_phys(page)>>12)+(n))<<12))
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#define __page_to_pfn(page) (page_to_phys(page)>>12)
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
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/*
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* These are the virtual MM functions - opening of an area, closing and
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* unmapping it (needed to keep files on disk up-to-date etc), pointer
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* to the functions called when a no-page or a wp-page exception occurs.
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*/
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struct vm_operations_struct {
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void (*open)(struct vm_area_struct * area);
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void (*close)(struct vm_area_struct * area);
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int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
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/* notification that a previously read-only page is about to become
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* writable, if an error is returned it will cause a SIGBUS */
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int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf);
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/* called by access_process_vm when get_user_pages() fails, typically
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* for use by special VMAs that can switch between memory and hardware
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*/
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int (*access)(struct vm_area_struct *vma, unsigned long addr,
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void *buf, int len, int write);
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#ifdef CONFIG_NUMA
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/*
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* set_policy() op must add a reference to any non-NULL @new mempolicy
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* to hold the policy upon return. Caller should pass NULL @new to
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* remove a policy and fall back to surrounding context--i.e. do not
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* install a MPOL_DEFAULT policy, nor the task or system default
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* mempolicy.
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*/
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int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
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/*
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* get_policy() op must add reference [mpol_get()] to any policy at
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* (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
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* in mm/mempolicy.c will do this automatically.
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* get_policy() must NOT add a ref if the policy at (vma,addr) is not
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* marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
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* If no [shared/vma] mempolicy exists at the addr, get_policy() op
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* must return NULL--i.e., do not "fallback" to task or system default
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* policy.
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*/
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struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
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unsigned long addr);
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int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
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const nodemask_t *to, unsigned long flags);
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#endif
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/* called by sys_remap_file_pages() to populate non-linear mapping */
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int (*remap_pages)(struct vm_area_struct *vma, unsigned long addr,
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unsigned long size, pgoff_t pgoff);
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};
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#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
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#endif
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