C++ (Cpp) pmd_set Examples

Example #1

File: exit.c Project: bingone/fuckOS

int exit_mm(struct mm_struct *mm)
{
	pmd_t *pmd;
	pgd_t *pgd;
	uint32_t pgdno, pmdno;
	physaddr_t pa;

	struct vm_area_struct* vma = mm->mmap;
	struct page *page;
	
	if(!mm || !mm->mm_pgd)
		return 0;

	if(!atomic_dec_and_test(&mm->mm_count))
		return 0;

	delete_all_vma(mm);

	for (pgdno = 0; pgdno < pgd_index(KERNEL_BASE_ADDR); pgdno++) {
		pgd = mm->mm_pgd + pgdno;
		if(!pgd_present(*pgd) || pgd_none(*pgd))
			continue;
		pmd_t* tmp = (pmd_t *)pgd_page_vaddr(*pgd);
		
		for (pmdno = 0; pmdno < PTRS_PER_PMD; pmdno++) {
			pmd = tmp +  pmdno;
			if(!pmd_present(*pmd) || pmd_none(*pmd))
				continue;
			struct page* p = virt2page(pmd_page_vaddr(*pmd));
			page_decref(p);
			pmd_set(pmd,0,0);
		}
		struct page* p = virt2page(pgd_page_vaddr(*pgd));
		page_decref(p);
		pgd_set(pgd,0,0);
	}

	page = virt2page((viraddr_t)mm->mm_pgd);
	page_free(page);
	kfree(mm);

	return 0;
}

Example #2

File: motorola.c Project: 3sOx/asuswrt-merlin

static void __init map_node(int node)
{
#define PTRTREESIZE (256*1024)
#define ROOTTREESIZE (32*1024*1024)
	unsigned long physaddr, virtaddr, size;
	pgd_t *pgd_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	size = m68k_memory[node].size;
	physaddr = m68k_memory[node].addr;
	virtaddr = (unsigned long)phys_to_virt(physaddr);
	physaddr |= m68k_supervisor_cachemode |
		    _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY;
	if (CPU_IS_040_OR_060)
		physaddr |= _PAGE_GLOBAL040;

	while (size > 0) {
#ifdef DEBUG
		if (!(virtaddr & (PTRTREESIZE-1)))
			printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
				virtaddr);
#endif
		pgd_dir = pgd_offset_k(virtaddr);
		if (virtaddr && CPU_IS_020_OR_030) {
			if (!(virtaddr & (ROOTTREESIZE-1)) &&
			    size >= ROOTTREESIZE) {
#ifdef DEBUG
				printk ("[very early term]");
#endif
				pgd_val(*pgd_dir) = physaddr;
				size -= ROOTTREESIZE;
				virtaddr += ROOTTREESIZE;
				physaddr += ROOTTREESIZE;
				continue;
			}
		}
		if (!pgd_present(*pgd_dir)) {
			pmd_dir = kernel_ptr_table();
#ifdef DEBUG
			printk ("[new pointer %p]", pmd_dir);
#endif
			pgd_set(pgd_dir, pmd_dir);
		} else
			pmd_dir = pmd_offset(pgd_dir, virtaddr);

		if (CPU_IS_020_OR_030) {
			if (virtaddr) {
#ifdef DEBUG
				printk ("[early term]");
#endif
				pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
				physaddr += PTRTREESIZE;
			} else {
				int i;
#ifdef DEBUG
				printk ("[zero map]");
#endif
				zero_pgtable = kernel_ptr_table();
				pte_dir = (pte_t *)zero_pgtable;
				pmd_dir->pmd[0] = virt_to_phys(pte_dir) |
					_PAGE_TABLE | _PAGE_ACCESSED;
				pte_val(*pte_dir++) = 0;
				physaddr += PAGE_SIZE;
				for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
					pte_val(*pte_dir++) = physaddr;
			}
			size -= PTRTREESIZE;
			virtaddr += PTRTREESIZE;
		} else {
			if (!pmd_present(*pmd_dir)) {
#ifdef DEBUG
				printk ("[new table]");
#endif
				pte_dir = kernel_page_table();
				pmd_set(pmd_dir, pte_dir);
			}
			pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

			if (virtaddr) {
				if (!pte_present(*pte_dir))
					pte_val(*pte_dir) = physaddr;
			} else
				pte_val(*pte_dir) = 0;
			size -= PAGE_SIZE;
			virtaddr += PAGE_SIZE;
			physaddr += PAGE_SIZE;
		}

	}
#ifdef DEBUG
	printk("\n");
#endif
}