xref: /openbmc/linux/arch/powerpc/include/asm/page_64.h (revision f220d3eb)
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 
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