1/*
2 * page.h:  Various defines and such for MMU operations on the Sparc for
3 *          the Linux kernel.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#ifndef _SPARC_PAGE_H
9#define _SPARC_PAGE_H
10
11#include <linux/const.h>
12
13#define PAGE_SHIFT   12
14#define PAGE_SIZE    (_AC(1, UL) << PAGE_SHIFT)
15#define PAGE_MASK    (~(PAGE_SIZE-1))
16
17#ifndef __ASSEMBLY__
18
19#define clear_page(page)	 memset((void *)(page), 0, PAGE_SIZE)
20#define copy_page(to,from) 	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
21#define clear_user_page(addr, vaddr, page)	\
22	do { 	clear_page(addr);		\
23		sparc_flush_page_to_ram(page);	\
24	} while (0)
25#define copy_user_page(to, from, vaddr, page)	\
26	do {	copy_page(to, from);		\
27		sparc_flush_page_to_ram(page);	\
28	} while (0)
29
30/* The following structure is used to hold the physical
31 * memory configuration of the machine.  This is filled in
32 * prom_meminit() and is later used by mem_init() to set up
33 * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
34 * these structs, this is arbitrary.  The entry after the
35 * last valid one has num_bytes==0.
36 */
37struct sparc_phys_banks {
38  unsigned long base_addr;
39  unsigned long num_bytes;
40};
41
42#define SPARC_PHYS_BANKS 32
43
44extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
45
46/* passing structs on the Sparc slow us down tremendously... */
47
48/* #define STRICT_MM_TYPECHECKS */
49
50#ifdef STRICT_MM_TYPECHECKS
51/*
52 * These are used to make use of C type-checking..
53 */
54typedef struct { unsigned long pte; } pte_t;
55typedef struct { unsigned long iopte; } iopte_t;
56typedef struct { unsigned long pmdv[16]; } pmd_t;
57typedef struct { unsigned long pgd; } pgd_t;
58typedef struct { unsigned long ctxd; } ctxd_t;
59typedef struct { unsigned long pgprot; } pgprot_t;
60typedef struct { unsigned long iopgprot; } iopgprot_t;
61
62#define pte_val(x)	((x).pte)
63#define iopte_val(x)	((x).iopte)
64#define pmd_val(x)      ((x).pmdv[0])
65#define pgd_val(x)	((x).pgd)
66#define ctxd_val(x)	((x).ctxd)
67#define pgprot_val(x)	((x).pgprot)
68#define iopgprot_val(x)	((x).iopgprot)
69
70#define __pte(x)	((pte_t) { (x) } )
71#define __iopte(x)	((iopte_t) { (x) } )
72/* #define __pmd(x)        ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
73#define __pgd(x)	((pgd_t) { (x) } )
74#define __ctxd(x)	((ctxd_t) { (x) } )
75#define __pgprot(x)	((pgprot_t) { (x) } )
76#define __iopgprot(x)	((iopgprot_t) { (x) } )
77
78#else
79/*
80 * .. while these make it easier on the compiler
81 */
82typedef unsigned long pte_t;
83typedef unsigned long iopte_t;
84typedef struct { unsigned long pmdv[16]; } pmd_t;
85typedef unsigned long pgd_t;
86typedef unsigned long ctxd_t;
87typedef unsigned long pgprot_t;
88typedef unsigned long iopgprot_t;
89
90#define pte_val(x)	(x)
91#define iopte_val(x)	(x)
92#define pmd_val(x)      ((x).pmdv[0])
93#define pgd_val(x)	(x)
94#define ctxd_val(x)	(x)
95#define pgprot_val(x)	(x)
96#define iopgprot_val(x)	(x)
97
98#define __pte(x)	(x)
99#define __iopte(x)	(x)
100/* #define __pmd(x)        (x) */ /* XXX later */
101#define __pgd(x)	(x)
102#define __ctxd(x)	(x)
103#define __pgprot(x)	(x)
104#define __iopgprot(x)	(x)
105
106#endif
107
108typedef struct page *pgtable_t;
109
110#define TASK_UNMAPPED_BASE	0x50000000
111
112#else /* !(__ASSEMBLY__) */
113
114#define __pgprot(x)	(x)
115
116#endif /* !(__ASSEMBLY__) */
117
118#define PAGE_OFFSET	0xf0000000
119#ifndef __ASSEMBLY__
120extern unsigned long phys_base;
121extern unsigned long pfn_base;
122#endif
123#define __pa(x)			((unsigned long)(x) - PAGE_OFFSET + phys_base)
124#define __va(x)			((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
125
126#define virt_to_phys		__pa
127#define phys_to_virt		__va
128
129#define ARCH_PFN_OFFSET		(pfn_base)
130#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
131
132#define pfn_valid(pfn)		(((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
133#define virt_addr_valid(kaddr)	((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
134
135#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
136				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
137
138#include <asm-generic/memory_model.h>
139#include <asm-generic/getorder.h>
140
141#endif /* _SPARC_PAGE_H */
142