WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/mm/page.c



#include <mm/page.h>
#include <arch/mm/page.h>
#include <arch/mm/asid.h>
#include <mm/as.h>
#include <mm/frame.h>
#include <arch/barrier.h>
#include <arch/types.h>
#include <arch/asm.h>
#include <memstr.h>
#include <debug.h>
#include <arch.h>

 *
 * Identity-map memory structure
 * considering possible crossings
 * of page boundaries.
 *
 * @param s     Address of the structure.
 * @param size      Size of the structure.
 */
void map_structure(uintptr_t s, size_t size)
{
    int i, cnt, length;
 
    length = size + (s - (s & ~(PAGE_SIZE - 1)));
    cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0);
 
    for (i = 0; i < cnt; i++)
        page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE,
            s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE | PAGE_WRITE);
 
    /* Repel prefetched accesses to the old mapping. */
    memory_barrier();
}
 
/** Insert mapping of page to frame.
 *
 * Map virtual address page to physical address frame
 * using flags. Allocate and setup any missing page tables.
 *
 * The page table must be locked and interrupts must be disabled.
 *
 * @param as        Address space to wich page belongs.
 * @param page      Virtual address of the page to be mapped.
 * @param frame     Physical address of memory frame to which the mapping is
 *          done.
 * @param flags     Flags to be used for mapping.
 */
void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)
{
    ASSERT(page_mapping_operations);
    ASSERT(page_mapping_operations->mapping_insert);
   
    page_mapping_operations->mapping_insert(as, page, frame, flags);
   
    /* Repel prefetched accesses to the old mapping. */
    memory_barrier();
}
 
/** Remove mapping of page.
 *
 * Remove any mapping of page within address space as.
 * TLB shootdown should follow in order to make effects of
 * this call visible.
 *
 * The page table must be locked and interrupts must be disabled.
 *
 * @param as        Address space to wich page belongs.
 * @param page      Virtual address of the page to be demapped.
 */
void page_mapping_remove(as_t *as, uintptr_t page)
{
    ASSERT(page_mapping_operations);
    ASSERT(page_mapping_operations->mapping_remove);
   
    page_mapping_operations->mapping_remove(as, page);
 
    /* Repel prefetched accesses to the old mapping. */
    memory_barrier();
}
 
/** Find mapping for virtual page
 *
 * Find mapping for virtual page.
 *
 * The page table must be locked and interrupts must be disabled.
 *
 * @param as        Address space to wich page belongs.
 * @param page      Virtual page.
 *
 * @return      NULL if there is no such mapping; requested mapping
 *          otherwise.
 */
pte_t *page_mapping_find(as_t *as, uintptr_t page)
{
    ASSERT(page_mapping_operations);
    ASSERT(page_mapping_operations->mapping_find);

Rev 2222	Rev 3128
Line 43...	Line 43...
43	#include <mm/page.h>	43	#include <mm/page.h>
44	#include <arch/mm/page.h>	44	#include <arch/mm/page.h>
45	#include <arch/mm/asid.h>	45	#include <arch/mm/asid.h>
46	#include <mm/as.h>	46	#include <mm/as.h>
47	#include <mm/frame.h>	47	#include <mm/frame.h>
-		48	#include <arch/barrier.h>
48	#include <arch/types.h>	49	#include <arch/types.h>
49	#include <arch/asm.h>	50	#include <arch/asm.h>
50	#include <memstr.h>	51	#include <memstr.h>
51	#include <debug.h>	52	#include <debug.h>
52	#include <arch.h>	53	#include <arch.h>
Line 63...	Line 64...
63	*	64	*
64	* Identity-map memory structure	65	* Identity-map memory structure
65	* considering possible crossings	66	* considering possible crossings
66	* of page boundaries.	67	* of page boundaries.
67	*	68	*
68	* @param s Address of the structure.	69	* @param s Address of the structure.
69	* @param size Size of the structure.	70	* @param size Size of the structure.
70	*/	71	*/
71	void map_structure(uintptr_t s, size_t size)	72	void map_structure(uintptr_t s, size_t size)
72	{	73	{
73	int i, cnt, length;	74	int i, cnt, length;
74		75
75	length = size + (s - (s & ~(PAGE_SIZE - 1)));	76	length = size + (s - (s & ~(PAGE_SIZE - 1)));
76	cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0);	77	cnt = length / PAGE_SIZE + (length % PAGE_SIZE > 0);
77		78
78	for (i = 0; i < cnt; i++)	79	for (i = 0; i < cnt; i++)
-		80	page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE,
79	page_mapping_insert(AS_KERNEL, s + i * PAGE_SIZE, s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE \| PAGE_WRITE);	81	s + i * PAGE_SIZE, PAGE_NOT_CACHEABLE \| PAGE_WRITE);
80		82
-		83	/* Repel prefetched accesses to the old mapping. */
-		84	memory_barrier();
81	}	85	}
82		86
83	/** Insert mapping of page to frame.	87	/** Insert mapping of page to frame.
84	*	88	*
85	* Map virtual address page to physical address frame	89	* Map virtual address page to physical address frame
86	* using flags. Allocate and setup any missing page tables.	90	* using flags. Allocate and setup any missing page tables.
87	*	91	*
88	* The page table must be locked and interrupts must be disabled.	92	* The page table must be locked and interrupts must be disabled.
89	*	93	*
90	* @param as Address space to wich page belongs.	94	* @param as Address space to wich page belongs.
91	* @param page Virtual address of the page to be mapped.	95	* @param page Virtual address of the page to be mapped.
92	* @param frame Physical address of memory frame to which the mapping is done.	96	* @param frame Physical address of memory frame to which the mapping is
-		97	* done.
93	* @param flags Flags to be used for mapping.	98	* @param flags Flags to be used for mapping.
94	*/	99	*/
95	void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)	100	void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags)
96	{	101	{
97	ASSERT(page_mapping_operations);	102	ASSERT(page_mapping_operations);
98	ASSERT(page_mapping_operations->mapping_insert);	103	ASSERT(page_mapping_operations->mapping_insert);
99		104
100	page_mapping_operations->mapping_insert(as, page, frame, flags);	105	page_mapping_operations->mapping_insert(as, page, frame, flags);
-		106
-		107	/* Repel prefetched accesses to the old mapping. */
-		108	memory_barrier();
101	}	109	}
102		110
103	/** Remove mapping of page.	111	/** Remove mapping of page.
104	*	112	*
105	* Remove any mapping of page within address space as.	113	* Remove any mapping of page within address space as.
106	* TLB shootdown should follow in order to make effects of	114	* TLB shootdown should follow in order to make effects of
107	* this call visible.	115	* this call visible.
108	*	116	*
109	* The page table must be locked and interrupts must be disabled.	117	* The page table must be locked and interrupts must be disabled.
110	*	118	*
111	* @param as Address space to wich page belongs.	119	* @param as Address space to wich page belongs.
112	* @param page Virtual address of the page to be demapped.	120	* @param page Virtual address of the page to be demapped.
113	*/	121	*/
114	void page_mapping_remove(as_t *as, uintptr_t page)	122	void page_mapping_remove(as_t *as, uintptr_t page)
115	{	123	{
116	ASSERT(page_mapping_operations);	124	ASSERT(page_mapping_operations);
117	ASSERT(page_mapping_operations->mapping_remove);	125	ASSERT(page_mapping_operations->mapping_remove);
118		126
119	page_mapping_operations->mapping_remove(as, page);	127	page_mapping_operations->mapping_remove(as, page);
-		128
-		129	/* Repel prefetched accesses to the old mapping. */
-		130	memory_barrier();
120	}	131	}
121		132
122	/** Find mapping for virtual page	133	/** Find mapping for virtual page
123	*	134	*
124	* Find mapping for virtual page.	135	* Find mapping for virtual page.
125	*	136	*
126	* The page table must be locked and interrupts must be disabled.	137	* The page table must be locked and interrupts must be disabled.
127	*	138	*
128	* @param as Address space to wich page belongs.	139	* @param as Address space to wich page belongs.
129	* @param page Virtual page.	140	* @param page Virtual page.
130	*	141	*
131	* @return NULL if there is no such mapping; requested mapping otherwise.	142	* @return NULL if there is no such mapping; requested mapping
-		143	* otherwise.
132	*/	144	*/
133	pte_t page_mapping_find(as_t as, uintptr_t page)	145	pte_t page_mapping_find(as_t as, uintptr_t page)
134	{	146	{
135	ASSERT(page_mapping_operations);	147	ASSERT(page_mapping_operations);
136	ASSERT(page_mapping_operations->mapping_find);	148	ASSERT(page_mapping_operations->mapping_find);

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(root)/trunk/kernel/generic/src/mm/page.c @ 2222 – Rev 2222 → 3128