void MtxTranspose3x3(matrix_t m)
{
float tmp;
SWAP_IDX(0,1);
SWAP_IDX(0,2);
SWAP_IDX(1,2);
}
void MtxTranspose(matrix_t m)
{
float tmp;
SWAP_IDX(0,1);
SWAP_IDX(0,2);
SWAP_IDX(0,3);
SWAP_IDX(1,2);
SWAP_IDX(1,3);
SWAP_IDX(2,3);
}
static void swapin(int npages, struct addrspace* as) {
// 1. check if coremap lock is already held, else acquire it
if (swap_state == SWAP_STATE_NOSWAP) {
panic("Attempting to swap in when no swap disk is found!\n");
}
lock_acquire(swap_lock);
// 2. select a bunch of non kernel pages.
unsigned int i;
for (i = 0; i < page_count; i++) {
int i_idx = SWAP_IDX(i + swap_prev_write_idx);
if (cm_isEntryUsed(COREMAP(i_idx)) && cm_getEntryAddrspaceIdent(COREMAP(i_idx)) != NULL) {
struct page* pg = NULL;
if (cm_getEntryAddrspaceIdent(COREMAP(i_idx)) == as) {
pg = findPageFromCoreMap(COREMAP(i_idx), i_idx);
int spl = splhigh();
int tlbpos = tlb_probe(pg->pt_virtbase * PAGE_SIZE, 0);
splx(spl);
if (tlbpos >= 0) {
//kprintf("tlb hit at %x %d\n",pg->pt_pagebase, tlbpos);
continue;
}
}
int j = 0;
int flag = 1;
for (j = 0; j < npages; j++) {
int j_idx = SWAP_IDX(i + j + swap_prev_write_idx);
if (j_idx >= (int)page_count) {
kprintf("page count greater than i+j\n");
flag = 0;
break;
}
if (cm_isEntryUsed(
COREMAP(j_idx)) && cm_getEntryAddrspaceIdent(COREMAP(j_idx)) == NULL) {
kprintf("page used by kernel\n");
flag = 0;
break;
}
}
if (flag == 1) {
for (j = 0; j < npages; j++) {
int j_idx = SWAP_IDX(i + j + swap_prev_write_idx);
if (cm_isEntryUsed(COREMAP(j_idx)) && cm_getEntryAddrspaceIdent(COREMAP(j_idx)) != NULL) {
swaponepagein(j_idx, as);
cm_setEntryUseState(COREMAP(j_idx), false);
cm_setEntryDirtyState(COREMAP(j_idx), false);
// let the address space identifier be NULL initially
cm_setEntryAddrspaceIdent(COREMAP(j_idx), NULL);
coremap_pages_free++;
swap_prev_write_idx = j_idx + 1;
/*if(pg != NULL) {
kprintf("swapped in page was = %x\n", pg->pt_virtbase);
} else {
kprintf("page was nill\n");
}*/
} else {
kprintf("How did this get approved?\n");
}
}
//spinlock_acquire(&coremap_lock);
lock_release(swap_lock);
return;
}
}
}
panic("Out of pages to swap out!\n");
//spinlock_acquire(&coremap_lock);
lock_release(swap_lock);
// 2.5 Maintain a index of last page that was swapped in so that you swap in the one after that
// 5. free lock if you had acquired it in this method
}
