WebSVN – HelenOS-historic – Diff – /kernel/trunk/genarch/src/mm/page_pt.c



 * @param flags Flags to be used for mapping.
 */
void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)
{
    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
    pte_t *newpt;
 
    ptl0 = (pte_t *) PA2KA((__address) as->page_table);
 
    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
        memsetb((__address)newpt, PAGE_SIZE, 0);
        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
    }
 
    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
 
    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
        memsetb((__address)newpt, PAGE_SIZE, 0);
        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
    }
 
    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
 
    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
        memsetb((__address)newpt, PAGE_SIZE, 0);
        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
    }
 
    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));

    if (empty) {
        /*
         * PTL3 is empty.
         * Release the frame and remove PTL3 pointer from preceding table.
         */
        frame_free(KA2PA((__address) ptl3));
        if (PTL2_ENTRIES)
            memsetb((__address) &ptl2[PTL2_INDEX(page)], sizeof(pte_t), 0);
        else if (PTL1_ENTRIES)
            memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
        else

        if (empty) {
            /*
             * PTL2 is empty.
             * Release the frame and remove PTL2 pointer from preceding table.
             */
            frame_free(KA2PA((__address) ptl2));
            if (PTL1_ENTRIES)
                memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
            else
                memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
        }

        if (empty) {
            /*
             * PTL1 is empty.
             * Release the frame and remove PTL1 pointer from preceding table.
             */
            frame_free(KA2PA((__address) ptl1));
            memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
        }
    }
 
}

Rev 1702	Rev 1760
Line 69...	Line 69...
69	* @param flags Flags to be used for mapping.	69	* @param flags Flags to be used for mapping.
70	*/	70	*/
71	void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)	71	void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)
72	{	72	{
73	pte_t ptl0, ptl1, ptl2, ptl3;	73	pte_t ptl0, ptl1, ptl2, ptl3;
74	__address newpt;	74	pte_t *newpt;
75		75
76	ptl0 = (pte_t *) PA2KA((__address) as->page_table);	76	ptl0 = (pte_t *) PA2KA((__address) as->page_table);
77		77
78	if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {	78	if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
79	newpt = PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA)));	79	newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
80	memsetb(newpt, PAGE_SIZE, 0);	80	memsetb((__address)newpt, PAGE_SIZE, 0);
81	SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));	81	SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
82	SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);	82	SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);
83	}	83	}
84		84
85	ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));	85	ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
86		86
87	if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {	87	if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
88	newpt = PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA)));	88	newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
89	memsetb(newpt, PAGE_SIZE, 0);	89	memsetb((__address)newpt, PAGE_SIZE, 0);
90	SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));	90	SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
91	SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);	91	SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);
92	}	92	}
93		93
94	ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));	94	ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
95		95
96	if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {	96	if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
97	newpt = PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA)));	97	newpt = (pte_t *)frame_alloc(ONE_FRAME, FRAME_KA);
98	memsetb(newpt, PAGE_SIZE, 0);	98	memsetb((__address)newpt, PAGE_SIZE, 0);
99	SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));	99	SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
100	SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);	100	SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC \| PAGE_CACHEABLE \| PAGE_WRITE);
101	}	101	}
102		102
103	ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));	103	ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
Line 163...	Line 163...
163	if (empty) {	163	if (empty) {
164	/*	164	/*
165	* PTL3 is empty.	165	* PTL3 is empty.
166	* Release the frame and remove PTL3 pointer from preceding table.	166	* Release the frame and remove PTL3 pointer from preceding table.
167	*/	167	*/
168	frame_free(ADDR2PFN(KA2PA((__address) ptl3)));	168	frame_free(KA2PA((__address) ptl3));
169	if (PTL2_ENTRIES)	169	if (PTL2_ENTRIES)
170	memsetb((__address) &ptl2[PTL2_INDEX(page)], sizeof(pte_t), 0);	170	memsetb((__address) &ptl2[PTL2_INDEX(page)], sizeof(pte_t), 0);
171	else if (PTL1_ENTRIES)	171	else if (PTL1_ENTRIES)
172	memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);	172	memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
173	else	173	else
Line 192...	Line 192...
192	if (empty) {	192	if (empty) {
193	/*	193	/*
194	* PTL2 is empty.	194	* PTL2 is empty.
195	* Release the frame and remove PTL2 pointer from preceding table.	195	* Release the frame and remove PTL2 pointer from preceding table.
196	*/	196	*/
197	frame_free(ADDR2PFN(KA2PA((__address) ptl2)));	197	frame_free(KA2PA((__address) ptl2));
198	if (PTL1_ENTRIES)	198	if (PTL1_ENTRIES)
199	memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);	199	memsetb((__address) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
200	else	200	else
201	memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);	201	memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
202	}	202	}
Line 221...	Line 221...
221	if (empty) {	221	if (empty) {
222	/*	222	/*
223	* PTL1 is empty.	223	* PTL1 is empty.
224	* Release the frame and remove PTL1 pointer from preceding table.	224	* Release the frame and remove PTL1 pointer from preceding table.
225	*/	225	*/
226	frame_free(ADDR2PFN(KA2PA((__address) ptl1)));	226	frame_free(KA2PA((__address) ptl1));
227	memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);	227	memsetb((__address) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
228	}	228	}
229	}	229	}
230		230
231	}	231	}

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/genarch/src/mm/page_pt.c – Rev 1702 → 1760