1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_PAGE_64_H
3 #define _ASM_POWERPC_PAGE_64_H
4
5 /*
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9 #include <asm/asm-const.h>
10
11 /*
12 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
13 * specific, every notion of page number shared with the firmware, TCEs,
14 * iommu, etc... still uses a page size of 4K.
15 */
16 #define HW_PAGE_SHIFT 12
17 #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT)
18 #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1))
19
20 /*
21 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
22 * HW_PAGE_SHIFT, that is 4K pages.
23 */
24 #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT)
25
26 /* Segment size; normal 256M segments */
27 #define SID_SHIFT 28
28 #define SID_MASK ASM_CONST(0xfffffffff)
29 #define ESID_MASK 0xfffffffff0000000UL
30 #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
31
32 /* 1T segments */
33 #define SID_SHIFT_1T 40
34 #define SID_MASK_1T 0xffffffUL
35 #define ESID_MASK_1T 0xffffff0000000000UL
36 #define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
37
38 #ifndef __ASSEMBLY__
39 #include <asm/cache.h>
40
41 typedef unsigned long pte_basic_t;
42
43 static inline void clear_page(void *addr)
44 {
45 unsigned long iterations;
46 unsigned long onex, twox, fourx, eightx;
47
48 iterations = ppc64_caches.l1d.blocks_per_page / 8;
49
50 /*
51 * Some verisions of gcc use multiply instructions to
52 * calculate the offsets so lets give it a hand to
53 * do better.
54 */
55 onex = ppc64_caches.l1d.block_size;
56 twox = onex << 1;
57 fourx = onex << 2;
58 eightx = onex << 3;
59
60 asm volatile(
61 "mtctr %1 # clear_page\n\
62 .balign 16\n\
63 1: dcbz 0,%0\n\
64 dcbz %3,%0\n\
65 dcbz %4,%0\n\
66 dcbz %5,%0\n\
67 dcbz %6,%0\n\
68 dcbz %7,%0\n\
69 dcbz %8,%0\n\
70 dcbz %9,%0\n\
71 add %0,%0,%10\n\
72 bdnz+ 1b"
73 : "=&r" (addr)
74 : "r" (iterations), "" (addr), "b" (onex), "b" (twox),
75 "b" (twox+onex), "b" (fourx), "b" (fourx+onex),
76 "b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
77 : "ctr", "memory");
78 }
79
80 extern void copy_page(void *to, void *from);
81
82 /* Log 2 of page table size */
83 extern u64 ppc64_pft_size;
84
85 #endif /* __ASSEMBLY__ */
86
87 #define VM_DATA_DEFAULT_FLAGS \
88 (is_32bit_task() ? \
89 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
90
91 /*
92 * This is the default if a program doesn't have a PT_GNU_STACK
93 * program header entry. The PPC64 ELF ABI has a non executable stack
94 * stack by default, so in the absence of a PT_GNU_STACK program header
95 * we turn execute permission off.
96 */
97 #define VM_STACK_DEFAULT_FLAGS32 VM_DATA_FLAGS_EXEC
98 #define VM_STACK_DEFAULT_FLAGS64 VM_DATA_FLAGS_NON_EXEC
99
100 #define VM_STACK_DEFAULT_FLAGS \
101 (is_32bit_task() ? \
102 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
103
104 #include <asm-generic/getorder.h>
105
106 #endif /* _ASM_POWERPC_PAGE_64_H */
107
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