WebSVN – HelenOS-historic – Diff – /SPARTAN/trunk/generic/src/mm/page.c



    __address newpt;
 
    ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS());
 
    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = frame_alloc(FRAME_KA, 0);
        memsetb(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);
    }
 
    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
 
    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = frame_alloc(FRAME_KA, 0);
        memsetb(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);
    }
 
    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
 
    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
        newpt = frame_alloc(FRAME_KA, 0);
        memsetb(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);
    }
 

Subversion Repositories HelenOS-historic

(root)/SPARTAN/trunk/generic/src/mm/page.c – Rev 532 → 533

Rev 532		Rev 533
Line 77...		Line 77...
77	__address newpt;	77	__address newpt;
78		78
79	ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS());	79	ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS());
80		80
81	if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {	81	if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
82	newpt = frame_alloc(FRAME_KA);	82	newpt = frame_alloc(FRAME_KA, 0);
83	memsetb(newpt, PAGE_SIZE, 0);	83	memsetb(newpt, PAGE_SIZE, 0);
84	SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));	84	SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
85	SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);	85	SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);
86	}	86	}
87		87
88	ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));	88	ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
89		89
90	if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {	90	if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
91	newpt = frame_alloc(FRAME_KA);	91	newpt = frame_alloc(FRAME_KA, 0);
92	memsetb(newpt, PAGE_SIZE, 0);	92	memsetb(newpt, PAGE_SIZE, 0);
93	SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));	93	SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
94	SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);	94	SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);
95	}	95	}
96		96
97	ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));	97	ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
98		98
99	if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {	99	if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
100	newpt = frame_alloc(FRAME_KA);	100	newpt = frame_alloc(FRAME_KA, 0);
101	memsetb(newpt, PAGE_SIZE, 0);	101	memsetb(newpt, PAGE_SIZE, 0);
102	SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));	102	SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
103	SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);	103	SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT \| PAGE_USER \| PAGE_EXEC);
104	}	104	}
105		105