xref: /openbmc/linux/arch/powerpc/include/asm/page_64.h (revision c62da0c3)
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 
clear_page(void * addr)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), "0" (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