- pgd_t * pg_dir;
- pmd_t * pm_dir;
- pte_t * pt_dir;
- pte_t pte;
- int i,j,k;
- unsigned long pfn = 0;
- unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
- _KERN_REGION_TABLE;
- static const int ssm_mask = 0x04000000L;
-
- unsigned long zones_size[MAX_NR_ZONES];
- unsigned long dma_pfn, high_pfn;
-
- memset(zones_size, 0, sizeof(zones_size));
- dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
- high_pfn = max_low_pfn;
-
- if (dma_pfn > high_pfn)
- zones_size[ZONE_DMA] = high_pfn;
- else {
- zones_size[ZONE_DMA] = dma_pfn;
- zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
- }
-
- /* Initialize mem_map[]. */
- free_area_init_node(0, &contig_page_data, zones_size,
- __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
-
- /*
- * map whole physical memory to virtual memory (identity mapping)
- */
-
- pg_dir = swapper_pg_dir;
-
- for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
-
- if (pfn >= max_low_pfn) {
- pgd_clear(pg_dir);
- continue;
- }
-
- pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4);
- pgd_populate(&init_mm, pg_dir, pm_dir);
-
- for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
- if (pfn >= max_low_pfn) {
- pmd_clear(pm_dir);
- continue;
- }
-
- pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
- pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
-
- for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
- if (pfn >= max_low_pfn) {
- pte_clear(&init_mm, 0, &pte);
- continue;
- }
- set_pte(pt_dir, pte);
- pfn++;
- }
- }
- }
-
- S390_lowcore.kernel_asce = pgdir_k;
-
- /* enable virtual mapping in kernel mode */
- __asm__ __volatile__("lctlg 1,1,%0\n\t"
- "lctlg 7,7,%0\n\t"
- "lctlg 13,13,%0\n\t"
- "ssm %1"
- : :"m" (pgdir_k), "m" (ssm_mask));
-
- local_flush_tlb();
-
- return;