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Initial efforts to add copy on write and shadow vmas.

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This commit is contained in:
Bahadir Balban
2008-03-07 18:35:40 +00:00
parent 98b5c217f5
commit 7a54d722a7
10 changed files with 385 additions and 142 deletions
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23
tasks/mm0/include/vm_area.h
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@@ -31,6 +31,15 @@
#define VMA_COW (1 << 7)
#define VMA_FIXED (1 << 8)
/*
* A suggestion to how a non-page_array (i.e. a device)
* page could tell its physical address.
*/
struct devpage {
struct page page;
unsigned long phys;
};
struct page {
int count; /* Refcount */
struct spinlock lock; /* Page lock. */
@@ -38,7 +47,7 @@ struct page {
struct vm_object *owner;/* The vm_object the page belongs to */
unsigned long virtual; /* If refs >1, first mapper's virtual address */
unsigned int flags; /* Flags associated with the page. */
unsigned long f_offset; /* The offset page resides in its owner */
unsigned long offset; /* The offset page resides in its owner */
};
extern struct page *page_array;
@@ -59,8 +68,8 @@ struct fault_data {
};
struct vm_pager_ops {
int (*page_in)(struct vm_object *vm_obj, unsigned long pfn_offset);
int (*page_out)(struct vm_object *vm_obj, unsigned long pfn_offset);
struct page *(*page_in)(struct vm_object *vm_obj, unsigned long pfn_offset);
struct page *(*page_out)(struct vm_object *vm_obj, unsigned long pfn_offset);
};
/* Describes the pager task that handles a vm_area. */
@@ -120,14 +129,14 @@ struct vm_file {
void *priv_data; /* Device pagers use to access device info */
};
/* To create per-vma vm_object lists */
struct vma_obj_link {
struct list_head list;
struct vm_object *obj;
}
};
#define vm_object_to_file(obj) \
(struct vm_file *)container_of(obj, struct vm_file, vm_obj)
#define vm_object_to_file(obj) container_of(obj, struct vm_file, vm_obj)
/*
* Describes a virtually contiguous chunk of memory region in a task. It covers
@@ -146,7 +155,7 @@ struct vm_area {
unsigned long pfn_start; /* Region start virtual pfn */
unsigned long pfn_end; /* Region end virtual pfn, exclusive */
unsigned long flags; /* Protection flags. */
unsigned long f_offset; /* File offset in pfns */
unsigned long file_offset; /* File offset in pfns */
};
static inline struct vm_area *find_vma(unsigned long addr,