1#ifndef _ASM_POWERPC_PGTABLE_64K_H
2#define _ASM_POWERPC_PGTABLE_64K_H
3
4#include <asm-generic/pgtable-nopud.h>
5
6
7#define PTE_INDEX_SIZE  12
8#define PMD_INDEX_SIZE  12
9#define PUD_INDEX_SIZE	0
10#define PGD_INDEX_SIZE  4
11
12#define PTE_TABLE_SIZE	(sizeof(real_pte_t) << PTE_INDEX_SIZE)
13#define PMD_TABLE_SIZE	(sizeof(pmd_t) << PMD_INDEX_SIZE)
14#define PGD_TABLE_SIZE	(sizeof(pgd_t) << PGD_INDEX_SIZE)
15
16#define PTRS_PER_PTE	(1 << PTE_INDEX_SIZE)
17#define PTRS_PER_PMD	(1 << PMD_INDEX_SIZE)
18#define PTRS_PER_PGD	(1 << PGD_INDEX_SIZE)
19
20/* With 4k base page size, hugepage PTEs go at the PMD level */
21#define MIN_HUGEPTE_SHIFT	PAGE_SHIFT
22
23/* PMD_SHIFT determines what a second-level page table entry can map */
24#define PMD_SHIFT	(PAGE_SHIFT + PTE_INDEX_SIZE)
25#define PMD_SIZE	(1UL << PMD_SHIFT)
26#define PMD_MASK	(~(PMD_SIZE-1))
27
28/* PGDIR_SHIFT determines what a third-level page table entry can map */
29#define PGDIR_SHIFT	(PMD_SHIFT + PMD_INDEX_SIZE)
30#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
31#define PGDIR_MASK	(~(PGDIR_SIZE-1))
32
33/* Additional PTE bits (don't change without checking asm in hash_low.S) */
34#define _PAGE_HPTE_SUB	0x0ffff000 /* combo only: sub pages HPTE bits */
35#define _PAGE_HPTE_SUB0	0x08000000 /* combo only: first sub page */
36#define _PAGE_COMBO	0x10000000 /* this is a combo 4k page */
37#define _PAGE_4K_PFN	0x20000000 /* PFN is for a single 4k page */
38
39/* Note the full page bits must be in the same location as for normal
40 * 4k pages as the same asssembly will be used to insert 64K pages
41 * wether the kernel has CONFIG_PPC_64K_PAGES or not
42 */
43#define _PAGE_F_SECOND  0x00008000 /* full page: hidx bits */
44#define _PAGE_F_GIX     0x00007000 /* full page: hidx bits */
45
46/* PTE flags to conserve for HPTE identification */
47#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_HPTE_SUB |\
48                         _PAGE_COMBO)
49
50/* Shift to put page number into pte.
51 *
52 * That gives us a max RPN of 32 bits, which means a max of 48 bits
53 * of addressable physical space.
54 * We could get 3 more bits here by setting PTE_RPN_SHIFT to 29 but
55 * 32 makes PTEs more readable for debugging for now :)
56 */
57#define PTE_RPN_SHIFT	(32)
58#define PTE_RPN_MAX	(1UL << (64 - PTE_RPN_SHIFT))
59#define PTE_RPN_MASK	(~((1UL<<PTE_RPN_SHIFT)-1))
60
61/* _PAGE_CHG_MASK masks of bits that are to be preserved accross
62 * pgprot changes
63 */
64#define _PAGE_CHG_MASK	(PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
65                         _PAGE_ACCESSED)
66
67/* Bits to mask out from a PMD to get to the PTE page */
68#define PMD_MASKED_BITS		0x1ff
69/* Bits to mask out from a PGD/PUD to get to the PMD page */
70#define PUD_MASKED_BITS		0x1ff
71
72/* Manipulate "rpte" values */
73#define __real_pte(e,p) 	((real_pte_t) { \
74	(e), pte_val(*((p) + PTRS_PER_PTE)) })
75#define __rpte_to_hidx(r,index)	((pte_val((r).pte) & _PAGE_COMBO) ? \
76        (((r).hidx >> ((index)<<2)) & 0xf) : ((pte_val((r).pte) >> 12) & 0xf))
77#define __rpte_to_pte(r)	((r).pte)
78#define __rpte_sub_valid(rpte, index) \
79	(pte_val(rpte.pte) & (_PAGE_HPTE_SUB0 >> (index)))
80
81
82/* Trick: we set __end to va + 64k, which happens works for
83 * a 16M page as well as we want only one iteration
84 */
85#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)	    \
86        do {                                                                \
87                unsigned long __end = va + PAGE_SIZE;                       \
88                unsigned __split = (psize == MMU_PAGE_4K ||                 \
89				    psize == MMU_PAGE_64K_AP);              \
90                shift = mmu_psize_defs[psize].shift;                        \
91	        for (index = 0; va < __end; index++, va += (1 << shift)) {  \
92		        if (!__split || __rpte_sub_valid(rpte, index)) do { \
93
94#define pte_iterate_hashed_end() } while(0); } } while(0)
95
96#define pte_pagesize_index(mm, addr, pte)	\
97	(((pte) & _PAGE_COMBO)? MMU_PAGE_4K: MMU_PAGE_64K)
98
99#define remap_4k_pfn(vma, addr, pfn, prot)				\
100	remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE,		\
101			__pgprot(pgprot_val((prot)) | _PAGE_4K_PFN))
102
103#endif /* _ASM_POWERPC_PGTABLE_64K_H */
104