1#ifndef _PPC_PAGE_H
2#define _PPC_PAGE_H
3
4#include <asm/asm-compat.h>
5
6/* PAGE_SHIFT determines the page size */
7#define PAGE_SHIFT	12
8#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
9
10/*
11 * Subtle: this is an int (not an unsigned long) and so it
12 * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus
13 */
14#define PAGE_MASK	(~((1 << PAGE_SHIFT) - 1))
15
16#ifdef __KERNEL__
17
18/* This must match what is in arch/ppc/Makefile */
19#define PAGE_OFFSET	CONFIG_KERNEL_START
20#define KERNELBASE	PAGE_OFFSET
21#define is_kernel_addr(x)	((x) >= PAGE_OFFSET)
22
23#ifndef __ASSEMBLY__
24
25/*
26 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
27 * physical addressing.  For now this just the IBM PPC440.
28 */
29#ifdef CONFIG_PTE_64BIT
30typedef unsigned long long pte_basic_t;
31#define PTE_SHIFT	(PAGE_SHIFT - 3)	/* 512 ptes per page */
32#define PTE_FMT		"%16Lx"
33#else
34typedef unsigned long pte_basic_t;
35#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
36#define PTE_FMT		"%.8lx"
37#endif
38
39/* align addr on a size boundary - adjust address up/down if needed */
40#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
41#define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))
42
43/* align addr on a size boundary - adjust address up if needed */
44#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
45
46/* to align the pointer to the (next) page boundary */
47#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)
48
49
50#undef STRICT_MM_TYPECHECKS
51
52#ifdef STRICT_MM_TYPECHECKS
53/*
54 * These are used to make use of C type-checking..
55 */
56typedef struct { pte_basic_t pte; } pte_t;
57typedef struct { unsigned long pmd; } pmd_t;
58typedef struct { unsigned long pgd; } pgd_t;
59typedef struct { unsigned long pgprot; } pgprot_t;
60
61#define pte_val(x)	((x).pte)
62#define pmd_val(x)	((x).pmd)
63#define pgd_val(x)	((x).pgd)
64#define pgprot_val(x)	((x).pgprot)
65
66#define __pte(x)	((pte_t) { (x) } )
67#define __pmd(x)	((pmd_t) { (x) } )
68#define __pgd(x)	((pgd_t) { (x) } )
69#define __pgprot(x)	((pgprot_t) { (x) } )
70
71#else
72/*
73 * .. while these make it easier on the compiler
74 */
75typedef pte_basic_t pte_t;
76typedef unsigned long pmd_t;
77typedef unsigned long pgd_t;
78typedef unsigned long pgprot_t;
79
80#define pte_val(x)	(x)
81#define pmd_val(x)	(x)
82#define pgd_val(x)	(x)
83#define pgprot_val(x)	(x)
84
85#define __pte(x)	(x)
86#define __pmd(x)	(x)
87#define __pgd(x)	(x)
88#define __pgprot(x)	(x)
89
90#endif
91
92struct page;
93extern void clear_pages(void *page, int order);
94static inline void clear_page(void *page) { clear_pages(page, 0); }
95extern void copy_page(void *to, void *from);
96extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
97extern void copy_user_page(void *to, void *from, unsigned long vaddr,
98			   struct page *pg);
99
100#ifndef CONFIG_APUS
101#define PPC_MEMSTART	0
102#define PPC_PGSTART	0
103#define PPC_MEMOFFSET	PAGE_OFFSET
104#else
105extern unsigned long ppc_memstart;
106extern unsigned long ppc_pgstart;
107extern unsigned long ppc_memoffset;
108#define PPC_MEMSTART	ppc_memstart
109#define PPC_PGSTART	ppc_pgstart
110#define PPC_MEMOFFSET	ppc_memoffset
111#endif
112
113#if defined(CONFIG_APUS) && !defined(MODULE)
114/* map phys->virtual and virtual->phys for RAM pages */
115static inline unsigned long ___pa(unsigned long v)
116{
117	unsigned long p;
118	asm volatile ("1: addis %0, %1, %2;"
119		      ".section \".vtop_fixup\",\"aw\";"
120		      ".align  1;"
121		      ".long   1b;"
122		      ".previous;"
123		      : "=r" (p)
124		      : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
125
126	return p;
127}
128static inline void* ___va(unsigned long p)
129{
130	unsigned long v;
131	asm volatile ("1: addis %0, %1, %2;"
132		      ".section \".ptov_fixup\",\"aw\";"
133		      ".align  1;"
134		      ".long   1b;"
135		      ".previous;"
136		      : "=r" (v)
137		      : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
138
139	return (void*) v;
140}
141#else
142#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
143#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
144#endif
145
146extern int page_is_ram(unsigned long pfn);
147
148#define __pa(x) ___pa((unsigned long)(x))
149#define __va(x) ((void *)(___va((unsigned long)(x))))
150
151#define ARCH_PFN_OFFSET		(PPC_PGSTART)
152#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
153#define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)
154
155#define pfn_valid(pfn)		(((pfn) - PPC_PGSTART) < max_mapnr)
156#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
157
158/* Pure 2^n version of get_order */
159extern __inline__ int get_order(unsigned long size)
160{
161	int lz;
162
163	size = (size-1) >> PAGE_SHIFT;
164	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
165	return 32 - lz;
166}
167
168#endif /* __ASSEMBLY__ */
169
170#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
171				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
172
173/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
174#define __HAVE_ARCH_GATE_AREA		1
175
176#include <asm-generic/memory_model.h>
177#endif /* __KERNEL__ */
178#endif /* _PPC_PAGE_H */
179