1/*
  2 * pgtsun4.h:  Sun4 specific pgtable.h defines and code.
  3 *
  4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  5 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  6 */
  7#ifndef _SPARC_PGTSUN4C_H
  8#define _SPARC_PGTSUN4C_H
  9
 10#include <asm/contregs.h>
 11
 12/* PMD_SHIFT determines the size of the area a second-level page table can map */
 13#define SUN4C_PMD_SHIFT       23
 14
 15/* PGDIR_SHIFT determines what a third-level page table entry can map */
 16#define SUN4C_PGDIR_SHIFT       23
 17#define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
 18#define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
 19#define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
 20
 21/* To represent how the sun4c mmu really lays things out. */
 22#define SUN4C_REAL_PGDIR_SHIFT       18
 23#define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
 24#define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
 25#define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
 26
 27/* 19 bit PFN on sun4 */
 28#define SUN4C_PFN_MASK 0x7ffff
 29 
 30/* Don't increase these unless the structures in sun4c.c are fixed */
 31#define SUN4C_MAX_SEGMAPS 256
 32#define SUN4C_MAX_CONTEXTS 16
 33
 34/*
 35 * To be efficient, and not have to worry about allocating such
 36 * a huge pgd, we make the kernel sun4c tables each hold 1024
 37 * entries and the pgd similarly just like the i386 tables.
 38 */
 39#define SUN4C_PTRS_PER_PTE    1024
 40#define SUN4C_PTRS_PER_PMD    1
 41#define SUN4C_PTRS_PER_PGD    1024
 42
 43/*
 44 * Sparc SUN4C pte fields.
 45 */
 46#define _SUN4C_PAGE_VALID        0x80000000
 47#define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
 48#define _SUN4C_PAGE_DIRTY        0x40000000
 49#define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
 50#define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
 51#define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
 52#define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
 53#define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
 54#define _SUN4C_PAGE_FILE         0x02000000   /* implemented in software */
 55#define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
 56#define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
 57#define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
 58#define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
 59
 60#define _SUN4C_READABLE		(_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
 61				 _SUN4C_PAGE_ACCESSED)
 62#define _SUN4C_WRITEABLE	(_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
 63				 _SUN4C_PAGE_MODIFIED)
 64
 65#define _SUN4C_PAGE_CHG_MASK	(0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
 66
 67#define SUN4C_PAGE_NONE		__pgprot(_SUN4C_PAGE_PRESENT)
 68#define SUN4C_PAGE_SHARED	__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
 69					 _SUN4C_PAGE_WRITE)
 70#define SUN4C_PAGE_COPY		__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
 71#define SUN4C_PAGE_READONLY	__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
 72#define SUN4C_PAGE_KERNEL	__pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
 73					 _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
 74
 75/* SUN4C swap entry encoding
 76 *
 77 * We use 5 bits for the type and 19 for the offset.  This gives us
 78 * 32 swapfiles of 4GB each.  Encoding looks like:
 79 *
 80 * RRRRRRRRooooooooooooooooooottttt
 81 * fedcba9876543210fedcba9876543210
 82 *
 83 * The top 8 bits are reserved for protection and status bits, especially
 84 * FILE and PRESENT.
 85 */
 86#define SUN4C_SWP_TYPE_MASK	0x1f
 87#define SUN4C_SWP_OFF_MASK	0x7ffff
 88#define SUN4C_SWP_OFF_SHIFT	5
 89
 90#ifndef __ASSEMBLY__
 91
 92static inline unsigned long sun4c_get_synchronous_error(void)
 93{
 94	unsigned long sync_err;
 95
 96	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
 97			     "=r" (sync_err) :
 98			     "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
 99	return sync_err;
100}
101
102static inline unsigned long sun4c_get_synchronous_address(void)
103{
104	unsigned long sync_addr;
105
106	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
107			     "=r" (sync_addr) :
108			     "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
109	return sync_addr;
110}
111
112/* SUN4 pte, segmap, and context manipulation */
113static inline unsigned long sun4c_get_segmap(unsigned long addr)
114{
115  register unsigned long entry;
116
117  __asm__ __volatile__("\n\tlduha [%1] %2, %0\n\t" : 
118		       "=r" (entry) :
119		       "r" (addr), "i" (ASI_SEGMAP));
120  return entry;
121}
122
123static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
124{
125  __asm__ __volatile__("\n\tstha %1, [%0] %2; nop; nop; nop;\n\t" : :
126		       "r" (addr), "r" (entry),
127		       "i" (ASI_SEGMAP)
128		       : "memory");
129}
130
131static inline unsigned long sun4c_get_pte(unsigned long addr)
132{
133  register unsigned long entry;
134
135  __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" : 
136		       "=r" (entry) :
137		       "r" (addr), "i" (ASI_PTE));
138  return entry;
139}
140
141static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
142{
143  __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
144		       "r" (addr), 
145		       "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
146		       : "memory");
147}
148
149static inline int sun4c_get_context(void)
150{
151  register int ctx;
152
153  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
154		       "=r" (ctx) :
155		       "r" (AC_CONTEXT), "i" (ASI_CONTROL));
156
157  return ctx;
158}
159
160static inline int sun4c_set_context(int ctx)
161{
162  __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
163		       "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
164		       : "memory");
165
166  return ctx;
167}
168
169#endif /* !(__ASSEMBLY__) */
170
171#endif /* !(_SPARC_PGTSUN4_H) */