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