x86/mm/init.c

16 #include <asm/page.h>
169  * By default need to be able to allocate page tables below PGD firstly for
216  * enable and PPro Global page enable), so that any CPU's that boot
342  *	big page size instead small one if nearby are ram too.
384 	 * 32-bit without PAE has a 4M large page size.
409 	/* head if not big page alignment ? */
413 	 * Don't use a large page for the first 2/4MB of memory
432 	/* big page (2M) range */
449 	/* big page (1G) range */
459 	/* tail is not big page (1G) alignment */
469 	/* tail is not big page (2M) alignment */
477 	/* try to merge same page size and continuous */
492 		pr_debug(" [mem %#010lx-%#010lx] page %s\n",
562  * in using smaller size (i.e. 4K instead of 2M or 1G) page tables.
604 	 * difference of page table level shifts.
621  * [map_start, map_end) in top-down. That said, the page tables
656 	 * for page table.
686  * bottom-up allocation above the kernel, the page tables will
705 	 * for page table.
740 	 * The code below will alias kernel page-tables in the user-range of the
742 	 * be created when using the trampoline page-table.
780 		 * allocate page tables above the kernel. So we first map
782 		 * as soon as possible. And then use page tables allocated above
824 	 * Randomize the poking address, but make sure that the following page
837 	 * We need to trigger the allocation of the page-tables that will be
848  * is valid. The argument is a physical page number.
865 		 * request that the page be shown as all zeros.
892 	/* Make sure boundaries are page aligned */
905 	 * If debugging page accesses then do not free this memory but
907 	 * create a kernel page fault:
980 	 * We already reserve the end partial page before in
984 	 * So here We can do PAGE_ALIGN() safely to get partial page to be freed