1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun #ifndef _ASM_POWERPC_PAGE_64_H
3*4882a593Smuzhiyun #define _ASM_POWERPC_PAGE_64_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun /*
6*4882a593Smuzhiyun * Copyright (C) 2001 PPC64 Team, IBM Corp
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <asm/asm-const.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun /*
12*4882a593Smuzhiyun * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
13*4882a593Smuzhiyun * specific, every notion of page number shared with the firmware, TCEs,
14*4882a593Smuzhiyun * iommu, etc... still uses a page size of 4K.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun #define HW_PAGE_SHIFT 12
17*4882a593Smuzhiyun #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT)
18*4882a593Smuzhiyun #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1))
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun /*
21*4882a593Smuzhiyun * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
22*4882a593Smuzhiyun * HW_PAGE_SHIFT, that is 4K pages.
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT)
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* Segment size; normal 256M segments */
27*4882a593Smuzhiyun #define SID_SHIFT 28
28*4882a593Smuzhiyun #define SID_MASK ASM_CONST(0xfffffffff)
29*4882a593Smuzhiyun #define ESID_MASK 0xfffffffff0000000UL
30*4882a593Smuzhiyun #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun /* 1T segments */
33*4882a593Smuzhiyun #define SID_SHIFT_1T 40
34*4882a593Smuzhiyun #define SID_MASK_1T 0xffffffUL
35*4882a593Smuzhiyun #define ESID_MASK_1T 0xffffff0000000000UL
36*4882a593Smuzhiyun #define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun #ifndef __ASSEMBLY__
39*4882a593Smuzhiyun #include <asm/cache.h>
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun typedef unsigned long pte_basic_t;
42*4882a593Smuzhiyun
clear_page(void * addr)43*4882a593Smuzhiyun static inline void clear_page(void *addr)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun unsigned long iterations;
46*4882a593Smuzhiyun unsigned long onex, twox, fourx, eightx;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun iterations = ppc64_caches.l1d.blocks_per_page / 8;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * Some verisions of gcc use multiply instructions to
52*4882a593Smuzhiyun * calculate the offsets so lets give it a hand to
53*4882a593Smuzhiyun * do better.
54*4882a593Smuzhiyun */
55*4882a593Smuzhiyun onex = ppc64_caches.l1d.block_size;
56*4882a593Smuzhiyun twox = onex << 1;
57*4882a593Smuzhiyun fourx = onex << 2;
58*4882a593Smuzhiyun eightx = onex << 3;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun asm volatile(
61*4882a593Smuzhiyun "mtctr %1 # clear_page\n\
62*4882a593Smuzhiyun .balign 16\n\
63*4882a593Smuzhiyun 1: dcbz 0,%0\n\
64*4882a593Smuzhiyun dcbz %3,%0\n\
65*4882a593Smuzhiyun dcbz %4,%0\n\
66*4882a593Smuzhiyun dcbz %5,%0\n\
67*4882a593Smuzhiyun dcbz %6,%0\n\
68*4882a593Smuzhiyun dcbz %7,%0\n\
69*4882a593Smuzhiyun dcbz %8,%0\n\
70*4882a593Smuzhiyun dcbz %9,%0\n\
71*4882a593Smuzhiyun add %0,%0,%10\n\
72*4882a593Smuzhiyun bdnz+ 1b"
73*4882a593Smuzhiyun : "=&r" (addr)
74*4882a593Smuzhiyun : "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
75*4882a593Smuzhiyun "b" (twox+onex), "b" (fourx), "b" (fourx+onex),
76*4882a593Smuzhiyun "b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
77*4882a593Smuzhiyun : "ctr", "memory");
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun extern void copy_page(void *to, void *from);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun /* Log 2 of page table size */
83*4882a593Smuzhiyun extern u64 ppc64_pft_size;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun #define VM_DATA_DEFAULT_FLAGS \
88*4882a593Smuzhiyun (is_32bit_task() ? \
89*4882a593Smuzhiyun VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun /*
92*4882a593Smuzhiyun * This is the default if a program doesn't have a PT_GNU_STACK
93*4882a593Smuzhiyun * program header entry. The PPC64 ELF ABI has a non executable stack
94*4882a593Smuzhiyun * stack by default, so in the absence of a PT_GNU_STACK program header
95*4882a593Smuzhiyun * we turn execute permission off.
96*4882a593Smuzhiyun */
97*4882a593Smuzhiyun #define VM_STACK_DEFAULT_FLAGS32 VM_DATA_FLAGS_EXEC
98*4882a593Smuzhiyun #define VM_STACK_DEFAULT_FLAGS64 VM_DATA_FLAGS_NON_EXEC
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun #define VM_STACK_DEFAULT_FLAGS \
101*4882a593Smuzhiyun (is_32bit_task() ? \
102*4882a593Smuzhiyun VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun #include <asm-generic/getorder.h>
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun #endif /* _ASM_POWERPC_PAGE_64_H */
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