1#ifndef _PPC64_PAGE_H
2#define _PPC64_PAGE_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 <linux/config.h>
14
15/* PAGE_SHIFT determines the page size */
16#define PAGE_SHIFT	12
17#define PAGE_SIZE	(1UL << PAGE_SHIFT)
18#define PAGE_MASK	(~(PAGE_SIZE-1))
19#define PAGE_OFFSET_MASK (PAGE_SIZE-1)
20
21#define SID_SHIFT       28
22#define SID_MASK        0xfffffffff
23#define GET_ESID(x)     (((x) >> SID_SHIFT) & SID_MASK)
24
25/* Define an illegal instr to trap on the bug.
26 * We don't use 0 because that marks the end of a function
27 * in the ELF ABI.  That's "Boo Boo" in case you wonder...
28 */
29#define BUG_OPCODE .long 0x00b00b00  /* For asm */
30#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
31
32#ifdef __KERNEL__
33#ifndef __ASSEMBLY__
34#include <asm/naca.h>
35
36#define STRICT_MM_TYPECHECKS
37
38#define REGION_SIZE   4UL
39#define OFFSET_SIZE   60UL
40#define REGION_SHIFT  60UL
41#define OFFSET_SHIFT  0UL
42#define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
43#define REGION_STRIDE (1UL << REGION_SHIFT)
44
45#ifdef ___powerpc64__
46typedef union ppc64_va {
47        struct {
48                unsigned long off : OFFSET_SIZE;  /* intra-region offset */
49                unsigned long reg : REGION_SIZE;  /* region number */
50        } f;
51        unsigned long l;
52        void *p;
53} ppc64_va;
54#endif /* ___powerpc64__ */
55
56static __inline__ void clear_page(void *addr)
57{
58	unsigned long lines, line_size;
59
60	line_size = naca->dCacheL1LineSize;
61	lines = naca->dCacheL1LinesPerPage;
62
63	__asm__ __volatile__(
64"  	mtctr  	%1\n\
651:      dcbz  	0,%0\n\
66	add	%0,%0,%3\n\
67	bdnz+	1b"
68        : "=r" (addr)
69        : "r" (lines), "0" (addr), "r" (line_size)
70	: "ctr", "memory");
71}
72
73extern void copy_page(void *to, void *from);
74struct page;
75extern void clear_user_page(void *page, unsigned long vaddr);
76extern void copy_user_page(void *to, void *from, unsigned long vaddr);
77
78#ifdef STRICT_MM_TYPECHECKS
79/*
80 * These are used to make use of C type-checking.
81 * Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
82 */
83typedef struct { unsigned long pte; } pte_t;
84typedef struct { unsigned int  pmd; } pmd_t;
85typedef struct { unsigned int  pgd; } pgd_t;
86typedef struct { unsigned long pgprot; } pgprot_t;
87
88#define pte_val(x)	((x).pte)
89#define pmd_val(x)	((x).pmd)
90#define pgd_val(x)	((x).pgd)
91#define pgprot_val(x)	((x).pgprot)
92
93#define __pte(x)	((pte_t) { (x) } )
94#define __pmd(x)	((pmd_t) { (x) } )
95#define __pgd(x)	((pgd_t) { (x) } )
96#define __pgprot(x)	((pgprot_t) { (x) } )
97
98#else
99/*
100 * .. while these make it easier on the compiler
101 */
102typedef unsigned long pte_t;
103typedef unsigned int  pmd_t;
104typedef unsigned int  pgd_t;
105typedef unsigned long pgprot_t;
106
107#define pte_val(x)	(x)
108#define pmd_val(x)	(x)
109#define pgd_val(x)	(x)
110#define pgprot_val(x)	(x)
111
112#define __pte(x)	(x)
113#define __pmd(x)	(x)
114#define __pgd(x)	(x)
115#define __pgprot(x)	(x)
116
117#endif
118
119#ifdef CONFIG_XMON
120#include <asm/ptrace.h>
121extern void xmon(struct pt_regs *excp);
122#define BUG() do { \
123	printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
124	xmon(0); \
125} while (0)
126#elif defined(CONFIG_KDB)
127#include <asm/ptrace.h>
128#include <linux/kdb.h>
129/* extern void kdb(kdb_reason_t reason, int error, kdb_eframe_t ef); */
130#define BUG() do { \
131      printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
132      kdb(KDB_REASON_OOPS, 0, (kdb_eframe_t) 0); \
133} while (0)
134#else
135#define BUG() do { \
136	printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
137	__asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
138} while (0)
139#endif
140
141#define PAGE_BUG(page) do { BUG(); } while (0)
142
143/* Pure 2^n version of get_order */
144static inline int get_order(unsigned long size)
145{
146	int order;
147
148	size = (size-1) >> (PAGE_SHIFT-1);
149	order = -1;
150	do {
151		size >>= 1;
152		order++;
153	} while (size);
154	return order;
155}
156
157#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
158
159#endif /* __ASSEMBLY__ */
160
161/* align addr on a size boundry - adjust address up/down if needed */
162#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
163#define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))
164
165/* align addr on a size boundry - adjust address up if needed */
166#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
167
168/* to align the pointer to the (next) double word boundary */
169#define DOUBLEWORD_ALIGN(addr)	_ALIGN(addr,sizeof(unsigned long))
170
171/* to align the pointer to the (next) page boundary */
172#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)
173
174#ifdef MODULE
175#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
176#else
177#define __page_aligned \
178	__attribute__((__aligned__(PAGE_SIZE), \
179		__section__(".data.page_aligned")))
180#endif
181
182
183/* This must match the -Ttext linker address            */
184/* Note: tophys & tovirt make assumptions about how     */
185/*       KERNELBASE is defined for performance reasons. */
186/*       When KERNELBASE moves, those macros may have   */
187/*             to change!                               */
188#define PAGE_OFFSET     0xC000000000000000
189#define KERNELBASE      PAGE_OFFSET
190#define VMALLOCBASE     0xD000000000000000
191#define IOREGIONBASE    0xE000000000000000
192#define BOLTEDBASE      0xB000000000000000
193
194#define IO_REGION_ID       (IOREGIONBASE>>REGION_SHIFT)
195#define VMALLOC_REGION_ID  (VMALLOCBASE>>REGION_SHIFT)
196#define KERNEL_REGION_ID   (KERNELBASE>>REGION_SHIFT)
197#define BOLTED_REGION_ID   (BOLTEDBASE>>REGION_SHIFT)
198#define USER_REGION_ID     (0UL)
199#define REGION_ID(X)	   (((unsigned long)(X))>>REGION_SHIFT)
200
201/*
202 * Define valid/invalid EA bits (for all ranges)
203 */
204#define VALID_EA_BITS   (0x000001ffffffffffUL)
205#define INVALID_EA_BITS (~(REGION_MASK|VALID_EA_BITS))
206
207#define IS_VALID_REGION_ID(x) \
208        (((x) == USER_REGION_ID) || ((x) >= BOLTED_REGION_ID))
209#define IS_VALID_EA(x) \
210        ((!((x) & INVALID_EA_BITS)) && IS_VALID_REGION_ID(REGION_ID(x)))
211
212#define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE)
213#define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_SHIFT)
214
215#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
216
217/* Given that physical addresses do not map 1-1 to absolute addresses, we
218 * use these macros to better specify exactly what we want to do.
219 * The only restriction on their use is that the absolute address
220 * macros cannot be used until after the LMB structure has been
221 * initialized in prom.c.  -Peter
222 */
223#define __v2p(x) ((void *) __pa(x))
224#define __v2a(x) ((void *) phys_to_absolute(__pa(x)))
225#define __p2a(x) ((void *) phys_to_absolute(x))
226#define __p2v(x) ((void *) __va(x))
227#define __a2p(x) ((void *) absolute_to_phys(x))
228#define __a2v(x) ((void *) __va(absolute_to_phys(x)))
229
230#define virt_to_page(kaddr) (mem_map+(__pa((unsigned long)kaddr) >> PAGE_SHIFT))
231
232#define VALID_PAGE(page)    ((page - mem_map) < max_mapnr)
233
234#define MAP_NR(addr)        (__pa(addr) >> PAGE_SHIFT)
235
236#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
237				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
238
239#endif /* __KERNEL__ */
240#endif /* _PPC64_PAGE_H */
241