1 #ifndef _ASM_POWERPC_PAGE_64_H
2 #define _ASM_POWERPC_PAGE_64_H
3
4 /*
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #include <asm/asm-const.h>
14
15 /*
16 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
17 * specific, every notion of page number shared with the firmware, TCEs,
18 * iommu, etc... still uses a page size of 4K.
19 */
20 #define HW_PAGE_SHIFT 12
21 #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT)
22 #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1))
23
24 /*
25 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
26 * HW_PAGE_SHIFT, that is 4K pages.
27 */
28 #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT)
29
30 /* Segment size; normal 256M segments */
31 #define SID_SHIFT 28
32 #define SID_MASK ASM_CONST(0xfffffffff)
33 #define ESID_MASK 0xfffffffff0000000UL
34 #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
35
36 /* 1T segments */
37 #define SID_SHIFT_1T 40
38 #define SID_MASK_1T 0xffffffUL
39 #define ESID_MASK_1T 0xffffff0000000000UL
40 #define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
41
42 #ifndef __ASSEMBLY__
43 #include <asm/cache.h>
44
45 typedef unsigned long pte_basic_t;
46
clear_page(void * addr)47 static inline void clear_page(void *addr)
48 {
49 unsigned long iterations;
50 unsigned long onex, twox, fourx, eightx;
51
52 iterations = ppc64_caches.l1d.blocks_per_page / 8;
53
54 /*
55 * Some verisions of gcc use multiply instructions to
56 * calculate the offsets so lets give it a hand to
57 * do better.
58 */
59 onex = ppc64_caches.l1d.block_size;
60 twox = onex << 1;
61 fourx = onex << 2;
62 eightx = onex << 3;
63
64 asm volatile(
65 "mtctr %1 # clear_page\n\
66 .balign 16\n\
67 1: dcbz 0,%0\n\
68 dcbz %3,%0\n\
69 dcbz %4,%0\n\
70 dcbz %5,%0\n\
71 dcbz %6,%0\n\
72 dcbz %7,%0\n\
73 dcbz %8,%0\n\
74 dcbz %9,%0\n\
75 add %0,%0,%10\n\
76 bdnz+ 1b"
77 : "=&r" (addr)
78 : "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
79 "b" (twox+onex), "b" (fourx), "b" (fourx+onex),
80 "b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
81 : "ctr", "memory");
82 }
83
84 extern void copy_page(void *to, void *from);
85
86 /* Log 2 of page table size */
87 extern u64 ppc64_pft_size;
88
89 #endif /* __ASSEMBLY__ */
90
91 #define VM_DATA_DEFAULT_FLAGS \
92 (is_32bit_task() ? \
93 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
94
95 /*
96 * This is the default if a program doesn't have a PT_GNU_STACK
97 * program header entry. The PPC64 ELF ABI has a non executable stack
98 * stack by default, so in the absence of a PT_GNU_STACK program header
99 * we turn execute permission off.
100 */
101 #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
102 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
103
104 #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
105 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
106
107 #define VM_STACK_DEFAULT_FLAGS \
108 (is_32bit_task() ? \
109 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
110
111 #include <asm-generic/getorder.h>
112
113 #endif /* _ASM_POWERPC_PAGE_64_H */
114
