#include "PhysMem.ns.h" #include #include PageDirectory* kernelPageDirectory; namespace PhysMem { u32int nframes; Bitset *frames; void initPaging(u32int mem_size) { nframes = mem_size / 0x1000; frames = new Bitset(nframes); kernelPageDirectory = new (Mem::kalloc(sizeof(PageDirectory), true)) PageDirectory(); u32int i = 0xC0000000; while (i < Mem::placementAddress) { page_t *p2 = kernelPageDirectory->getPage(i, true); allocFrame(p2, true, false); /* /DEBUG_HEX(i); DEBUG(" =>"); DEBUG_HEX(p2->frame); DEBUG("."); */ i += 0x1000; } //Also map thoses pages at begning of virtual memory for (u32int i = 0; i < (Mem::placementAddress - 0xC0000000) / 0x100000; i++) { kernelPageDirectory->tablesPhysical[i] = kernelPageDirectory->tablesPhysical[768 + i]; kernelPageDirectory->tables[i] = kernelPageDirectory->tables[768 + i]; } DEBUG_HEX((u32int)kernelPageDirectory->physicalAddr); DEBUG(" is page dir phys addr."); //asm volatile("hlt"); kernelPageDirectory->switchTo(); DEBUG("Paging enabled !"); Mem::pagingEnabled = true; } void removeTemporaryPages() { for (u32int i = 0; i < (Mem::placementAddress - 0xC0000000) / 0x100000; i++) { kernelPageDirectory->tablesPhysical[i] = 0; kernelPageDirectory->tables[i] = 0; } } void allocFrame(page_t *page, bool is_user, bool is_writable) { if (page->frame != 0) { return; } else { u32int idx = frames->firstFreeBit(); if (idx == (u32int) - 1) PANIC("No more free frames !"); frames->setBit(idx); page->present = 1; page->user = (is_user ? 1 : 0); page->rw = (is_writable ? 1 : 0); page->frame = idx; } } void freeFrame(page_t *page) { if (page->frame == 0) { return; } else { frames->clearBit(page->frame / 0x1000); page->frame = 0; } } u32int free() { return nframes - frames->usedBits(); } u32int total() { return nframes; } }