27 #include <asm/text-patching.h>
43  * WC and WT fall back to UC-.  pat_init() updates these values to support
45  * for the details.  Note, __early_ioremap() used during early boot-time
82  * Check that the write-protect PAT entry is set for write-protect.
83  * To do this without making assumptions how PAT has been set up (Xen has
169  * the 0-ISA_END_ADDRESS range and secondly for the initial PMD_SIZE mapping.
206 	unsigned long start;  member
216  * up after us can get the correct flags. Invoked on the boot CPU.
251 	/* Except when with PTI where the kernel is mostly non-Global: */  in probe_page_size_mask()
298 		 * This can't be cr4_set_bits_and_update_boot() -- the  in setup_pcid()
305 		 * Instead, we brute-force it and set CR4.PCIDE manually in  in setup_pcid()
334 		mr[nr_range].start = start_pfn<<PAGE_SHIFT;  in save_mr()
355 			unsigned long start = round_down(mr[i].start, PMD_SIZE);  in adjust_range_page_size_mask()  local
363 			if (memblock_is_region_memory(start, end - start))  in adjust_range_page_size_mask()
368 			unsigned long start = round_down(mr[i].start, PUD_SIZE);  in adjust_range_page_size_mask()  local
371 			if (memblock_is_region_memory(start, end - start))  in adjust_range_page_size_mask()
384 	if (mr->page_size_mask & (1<<PG_LEVEL_1G))  in page_size_string()
387 	 * 32-bit without PAE has a 4M large page size.  in page_size_string()
393 	    mr->page_size_mask & (1<<PG_LEVEL_2M))  in page_size_string()
396 	if (mr->page_size_mask & (1<<PG_LEVEL_2M))  in page_size_string()
403 				     unsigned long start,  in split_mem_range()  argument
413 	pfn = start_pfn = PFN_DOWN(start);  in split_mem_range()
481 	for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {  in split_mem_range()
483 		if (mr[i].end != mr[i+1].start ||  in split_mem_range()
487 		old_start = mr[i].start;  in split_mem_range()
489 			(nr_range - 1 - i) * sizeof(struct map_range));  in split_mem_range()
490 		mr[i--].start = old_start;  in split_mem_range()
491 		nr_range--;  in split_mem_range()
495 		pr_debug(" [mem %#010lx-%#010lx] page %s\n",  in split_mem_range()
496 				mr[i].start, mr[i].end - 1,  in split_mem_range()
513 	if (start_pfn < (1UL<<(32-PAGE_SHIFT)))  in add_pfn_range_mapped()
515 					 min(end_pfn, 1UL<<(32-PAGE_SHIFT)));  in add_pfn_range_mapped()
523 		if ((start_pfn >= pfn_mapped[i].start) &&  in pfn_range_is_mapped()
535 unsigned long __ref init_memory_mapping(unsigned long start,  in init_memory_mapping()  argument
542 	pr_debug("init_memory_mapping: [mem %#010lx-%#010lx]\n",  in init_memory_mapping()
543 	       start, end - 1);  in init_memory_mapping()
546 	nr_range = split_mem_range(mr, 0, start, end);  in init_memory_mapping()
549 		ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,  in init_memory_mapping()
553 	add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);  in init_memory_mapping()
580 		u64 start = clamp_val(PFN_PHYS(start_pfn), r_start, r_end);  in init_range_memory_mapping()  local
582 		if (start >= end)  in init_range_memory_mapping()
589 		can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >=  in init_range_memory_mapping()
591 		init_memory_mapping(start, end, PAGE_KERNEL);  in init_range_memory_mapping()
592 		mapped_ram_size += end - start;  in init_range_memory_mapping()
609 	 * Don't need to worry about overflow in the top-down case, on 32bit,  in get_new_step_size()
610 	 * when step_size is 0, round_down() returns 0 for start, and that  in get_new_step_size()
612 	 * In the bottom-up case, round_up(x, 0) returns 0 though too, which  in get_new_step_size()
615 	return step_size << (PMD_SHIFT - PAGE_SHIFT - 1);  in get_new_step_size()
619  * memory_map_top_down - Map [map_start, map_end) top down
620  * @map_start: start address of the target memory range
624  * [map_start, map_end) in top-down. That said, the page tables
626  * memory in top-down.
640 	 * Start with top-most PMD_SIZE range aligned at PMD_SIZE to ensure  in memory_map_top_down()
656 	 * We start from the top (end of memory) and go to the bottom.  in memory_map_top_down()
662 		unsigned long start;  in memory_map_top_down()  local
665 			start = round_down(last_start - 1, step_size);  in memory_map_top_down()
666 			if (start < map_start)  in memory_map_top_down()
667 				start = map_start;  in memory_map_top_down()
669 			start = map_start;  in memory_map_top_down()
670 		mapped_ram_size += init_range_memory_mapping(start,  in memory_map_top_down()
672 		last_start = start;  in memory_map_top_down()
683  * memory_map_bottom_up - Map [map_start, map_end) bottom up
684  * @map_start: start address of the target memory range
688  * [map_start, map_end) in bottom-up. Since we have limited the
689  * bottom-up allocation above the kernel, the page tables will
691  * in [map_start, map_end) in bottom-up.
696 	unsigned long next, start;  in memory_map_bottom_up()  local
701 	start = map_start;  in memory_map_bottom_up()
702 	min_pfn_mapped = start >> PAGE_SHIFT;  in memory_map_bottom_up()
705 	 * We start from the bottom (@map_start) and go to the top (@map_end).  in memory_map_bottom_up()
710 	while (start < map_end) {  in memory_map_bottom_up()
711 		if (step_size && map_end - start > step_size) {  in memory_map_bottom_up()
712 			next = round_up(start + 1, step_size);  in memory_map_bottom_up()
719 		mapped_ram_size += init_range_memory_mapping(start, next);  in memory_map_bottom_up()
720 		start = next;  in memory_map_bottom_up()
736  * area. This limits the randomization granularity to 1GB for both 4-level
737  * and 5-level paging.
743 	 * The code below will alias kernel page-tables in the user-range of the  in init_trampoline()
745 	 * be created when using the trampoline page-table.  in init_trampoline()
775 	 * If the allocation is in bottom-up direction, we setup direct mapping  in init_mem_mapping()
776 	 * in bottom-up, otherwise we setup direct mapping in top-down.  in init_mem_mapping()
834 			(TASK_SIZE - TASK_UNMAPPED_BASE - 3 * PAGE_SIZE);  in poking_init()
840 	 * We need to trigger the allocation of the page-tables that will be  in poking_init()
858  * Access has to be given to non-kernel-ram areas as well, these contain the
909 	 * mark them not present - any buggy init-section access will  in free_init_pages()
913 		pr_info("debug: unmapping init [mem %#010lx-%#010lx]\n",  in free_init_pages()
914 			begin, end - 1);  in free_init_pages()
919 		kmemleak_free_part((void *)begin, end - begin);  in free_init_pages()
920 		set_memory_np(begin, (end - begin) >> PAGE_SHIFT);  in free_init_pages()
925 		 * writeable and non-executable first.  in free_init_pages()
927 		set_memory_nx(begin, (end - begin) >> PAGE_SHIFT);  in free_init_pages()
928 		set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);  in free_init_pages()
944 	unsigned long len_pages = (end_ul - begin_ul) >> PAGE_SHIFT;  in free_kernel_image_pages()
978 void __init free_initrd_mem(unsigned long start, unsigned long end)  in free_initrd_mem()  argument
984 	 *   - i386_start_kernel()  in free_initrd_mem()
985 	 *   - x86_64_start_kernel()  in free_initrd_mem()
986 	 *   - relocate_initrd()  in free_initrd_mem()
989 	free_init_pages("initrd", start, PAGE_ALIGN(end));  in free_initrd_mem()
995  * and pass it to the MM layer - to help it set zone watermarks more
998  * Done on 64-bit systems only for the time being, although 32-bit systems
1019 		nr_pages += end_pfn - start_pfn;  in memblock_find_dma_reserve()
1033 			nr_free_pages += end_pfn - start_pfn;  in memblock_find_dma_reserve()
1036 	set_dma_reserve(nr_pages - nr_free_pages);  in memblock_find_dma_reserve()
1063 	.cr4 = ~0UL,	/* fail hard if we screw up cr4 shadow initialization */
1073 	/* entry 0 MUST be WB (hardwired to speed up translations) */  in update_cache_mode_entry()
1095 		l1tf_limit <<= PAGE_SHIFT - SWP_OFFSET_FIRST_BIT;  in arch_max_swapfile_size()