-struct map_range {
- unsigned long start;
- unsigned long end;
- unsigned page_size_mask;
-};
-
-#define NR_RANGE_MR 5
-
-static int save_mr(struct map_range *mr, int nr_range,
- unsigned long start_pfn, unsigned long end_pfn,
- unsigned long page_size_mask)
-{
-
- if (start_pfn < end_pfn) {
- if (nr_range >= NR_RANGE_MR)
- panic("run out of range for init_memory_mapping\n");
- mr[nr_range].start = start_pfn<<PAGE_SHIFT;
- mr[nr_range].end = end_pfn<<PAGE_SHIFT;
- mr[nr_range].page_size_mask = page_size_mask;
- nr_range++;
- }
-
- return nr_range;
-}
-
-/*
- * Setup the direct mapping of the physical memory at PAGE_OFFSET.
- * This runs before bootmem is initialized and gets pages directly from
- * the physical memory. To access them they are temporarily mapped.
- */
-unsigned long __init_refok init_memory_mapping(unsigned long start,
- unsigned long end)
-{
- unsigned long last_map_addr = 0;
- unsigned long page_size_mask = 0;
- unsigned long start_pfn, end_pfn;
- unsigned long pos;
-
- struct map_range mr[NR_RANGE_MR];
- int nr_range, i;
- int use_pse, use_gbpages;
-
- printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
-
- /*
- * Find space for the kernel direct mapping tables.
- *
- * Later we should allocate these tables in the local node of the
- * memory mapped. Unfortunately this is done currently before the
- * nodes are discovered.
- */
- if (!after_bootmem)
- init_gbpages();
-
-#ifdef CONFIG_DEBUG_PAGEALLOC
- /*
- * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
- * This will simplify cpa(), which otherwise needs to support splitting
- * large pages into small in interrupt context, etc.
- */
- use_pse = use_gbpages = 0;
-#else
- use_pse = cpu_has_pse;
- use_gbpages = direct_gbpages;
-#endif
-
- if (use_gbpages)
- page_size_mask |= 1 << PG_LEVEL_1G;
- if (use_pse)
- page_size_mask |= 1 << PG_LEVEL_2M;
-
- memset(mr, 0, sizeof(mr));
- nr_range = 0;
-
- /* head if not big page alignment ?*/
- start_pfn = start >> PAGE_SHIFT;
- pos = start_pfn << PAGE_SHIFT;
- end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- if (end_pfn > (end >> PAGE_SHIFT))
- end_pfn = end >> PAGE_SHIFT;
- if (start_pfn < end_pfn) {
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
- pos = end_pfn << PAGE_SHIFT;
- }
-
- /* big page (2M) range*/
- start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
- << (PUD_SHIFT - PAGE_SHIFT);
- if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
- end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
- if (start_pfn < end_pfn) {
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask & (1<<PG_LEVEL_2M));
- pos = end_pfn << PAGE_SHIFT;
- }
-
- /* big page (1G) range */
- start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
- << (PUD_SHIFT - PAGE_SHIFT);
- end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
- if (start_pfn < end_pfn) {
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask &
- ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
- pos = end_pfn << PAGE_SHIFT;
- }
-
- /* tail is not big page (1G) alignment */
- start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
- << (PMD_SHIFT - PAGE_SHIFT);
- end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
- if (start_pfn < end_pfn) {
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
- page_size_mask & (1<<PG_LEVEL_2M));
- pos = end_pfn << PAGE_SHIFT;
- }
-
- /* tail is not big page (2M) alignment */
- start_pfn = pos>>PAGE_SHIFT;
- end_pfn = end>>PAGE_SHIFT;
- nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
-
- /* try to merge same page size and continuous */
- for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
- unsigned long old_start;
- if (mr[i].end != mr[i+1].start ||
- mr[i].page_size_mask != mr[i+1].page_size_mask)
- continue;
- /* move it */
- old_start = mr[i].start;
- memmove(&mr[i], &mr[i+1],
- (nr_range - 1 - i) * sizeof (struct map_range));
- mr[i--].start = old_start;
- nr_range--;
- }
-
- for (i = 0; i < nr_range; i++)
- printk(KERN_DEBUG " %010lx - %010lx page %s\n",
- mr[i].start, mr[i].end,
- (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
- (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
-
- if (!after_bootmem)
- find_early_table_space(end, use_pse, use_gbpages);
-
- for (i = 0; i < nr_range; i++)
- last_map_addr = kernel_physical_mapping_init(
- mr[i].start, mr[i].end,
- mr[i].page_size_mask);
-
- if (!after_bootmem)
- mmu_cr4_features = read_cr4();
- __flush_tlb_all();
-
- if (!after_bootmem && table_end > table_start)
- reserve_early(table_start << PAGE_SHIFT,
- table_end << PAGE_SHIFT, "PGTABLE");
-
- printk(KERN_INFO "last_map_addr: %lx end: %lx\n",
- last_map_addr, end);
-
- if (!after_bootmem)
- early_memtest(start, end);
-
- return last_map_addr >> PAGE_SHIFT;
-}
-