include/asm/pgtable-64.h

16 #include <asm/page.h>
21 #include <asm-generic/pgtable-nopmd.h>
23 #include <asm-generic/pgtable-nopud.h>
25 #include <asm-generic/pgtable-nop4d.h>
29  * Each address space has 2 4K pages as its page directory, giving 1024
31  * single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
32  * tables. Each page table is also a single 4K page, giving 512 (==
39  * fault address - VMALLOC_START.
43 /* PGDIR_SHIFT determines what a third-level page table entry can map */
45 #define PGDIR_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
48 /* PMD_SHIFT determines the size of the area a second-level page table can map */
49 #define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT - 3))
51 #define PMD_MASK	(~(PMD_SIZE-1))
54 # define PGDIR_SHIFT	(PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
59 #define PUD_SHIFT	(PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
61 #define PUD_MASK	(~(PUD_SIZE-1))
62 #define PGDIR_SHIFT	(PUD_SHIFT + (PAGE_SHIFT + PUD_TABLE_ORDER - 3))
66 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
69  * For 4kB page size we use a 3 level page tree and an 8kB pud, which
75  * For 8kB page size we use a 3 level page tree which permits a total of
76  * 8TB of address space.  Alternatively a 33-bit / 8GB organization using
79  * For 16kB page size we use a 2 level page tree which permits a total of
83  * For 64kB page size we use a 2 level page table tree for a total of 42 bits
145 	     (1UL << cpu_vmbits)) - (1UL << 32))
149 /* Load modules into 32bit-compatible segment. */
151 #define MODULES_END	(FIXADDR_START-2*PAGE_SIZE)
171  * For 4-level pagetables we defines these ourselves, for 3-level the
172  * definitions are below, for 2-level the
173  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
215 #define p4d_index(address)	(((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
226  * For 3-level pagetables we defines these ourselves, for 2-level the
227  * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
328  *   6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3
329  *   3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
330  *   <--------------------------- offset ---------------------------
333  *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
334  *   --------------> E <-- type ---> <---------- zeroes ----------->