1/*
  2 * pgtsun4c.h:  Sun4c specific pgtable.h defines and code.
  3 *
  4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  5 */
  6#ifndef _SPARC_PGTSUN4C_H
  7#define _SPARC_PGTSUN4C_H
  8
  9#include <asm/contregs.h>
 10
 11/* PMD_SHIFT determines the size of the area a second-level page table can map */
 12#define SUN4C_PMD_SHIFT       22
 13
 14/* PGDIR_SHIFT determines what a third-level page table entry can map */
 15#define SUN4C_PGDIR_SHIFT       22
 16#define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
 17#define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
 18#define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
 19
 20/* To represent how the sun4c mmu really lays things out. */
 21#define SUN4C_REAL_PGDIR_SHIFT       18
 22#define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
 23#define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
 24#define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
 25
 26/* 16 bit PFN on sun4c */
 27#define SUN4C_PFN_MASK 0xffff
 28
 29/* Don't increase these unless the structures in sun4c.c are fixed */
 30#define SUN4C_MAX_SEGMAPS 256
 31#define SUN4C_MAX_CONTEXTS 16
 32
 33/*
 34 * To be efficient, and not have to worry about allocating such
 35 * a huge pgd, we make the kernel sun4c tables each hold 1024
 36 * entries and the pgd similarly just like the i386 tables.
 37 */
 38#define SUN4C_PTRS_PER_PTE    1024
 39#define SUN4C_PTRS_PER_PMD    1
 40#define SUN4C_PTRS_PER_PGD    1024
 41
 42/*
 43 * Sparc SUN4C pte fields.
 44 */
 45#define _SUN4C_PAGE_VALID        0x80000000
 46#define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
 47#define _SUN4C_PAGE_DIRTY        0x40000000
 48#define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
 49#define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
 50#define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
 51#define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
 52#define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
 53#define _SUN4C_PAGE_FILE         0x02000000   /* implemented in software */
 54#define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
 55#define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
 56#define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
 57#define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
 58
 59#define _SUN4C_READABLE		(_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
 60				 _SUN4C_PAGE_ACCESSED)
 61#define _SUN4C_WRITEABLE	(_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
 62				 _SUN4C_PAGE_MODIFIED)
 63
 64#define _SUN4C_PAGE_CHG_MASK	(0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
 65
 66#define SUN4C_PAGE_NONE		__pgprot(_SUN4C_PAGE_PRESENT)
 67#define SUN4C_PAGE_SHARED	__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
 68					 _SUN4C_PAGE_WRITE)
 69#define SUN4C_PAGE_COPY		__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
 70#define SUN4C_PAGE_READONLY	__pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
 71#define SUN4C_PAGE_KERNEL	__pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
 72					 _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
 73
 74/* SUN4C swap entry encoding
 75 *
 76 * We use 5 bits for the type and 19 for the offset.  This gives us
 77 * 32 swapfiles of 4GB each.  Encoding looks like:
 78 *
 79 * RRRRRRRRooooooooooooooooooottttt
 80 * fedcba9876543210fedcba9876543210
 81 *
 82 * The top 8 bits are reserved for protection and status bits, especially
 83 * FILE and PRESENT.
 84 */
 85#define SUN4C_SWP_TYPE_MASK	0x1f
 86#define SUN4C_SWP_OFF_MASK	0x7ffff
 87#define SUN4C_SWP_OFF_SHIFT	5
 88
 89#ifndef __ASSEMBLY__
 90
 91static inline unsigned long sun4c_get_synchronous_error(void)
 92{
 93	unsigned long sync_err;
 94
 95	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
 96			     "=r" (sync_err) :
 97			     "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
 98	return sync_err;
 99}
100
101static inline unsigned long sun4c_get_synchronous_address(void)
102{
103	unsigned long sync_addr;
104
105	__asm__ __volatile__("lda [%1] %2, %0\n\t" :
106			     "=r" (sync_addr) :
107			     "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
108	return sync_addr;
109}
110
111/* SUN4C pte, segmap, and context manipulation */
112static inline unsigned long sun4c_get_segmap(unsigned long addr)
113{
114  register unsigned long entry;
115
116  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" : 
117		       "=r" (entry) :
118		       "r" (addr), "i" (ASI_SEGMAP));
119
120  return entry;
121}
122
123static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
124{
125
126  __asm__ __volatile__("\n\tstba %1, [%0] %2; nop; nop; nop;\n\t" : :
127		       "r" (addr), "r" (entry),
128		       "i" (ASI_SEGMAP)
129		       : "memory");
130}
131
132static inline unsigned long sun4c_get_pte(unsigned long addr)
133{
134  register unsigned long entry;
135
136  __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" : 
137		       "=r" (entry) :
138		       "r" (addr), "i" (ASI_PTE));
139  return entry;
140}
141
142static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
143{
144  __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
145		       "r" (addr), 
146		       "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
147		       : "memory");
148}
149
150static inline int sun4c_get_context(void)
151{
152  register int ctx;
153
154  __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
155		       "=r" (ctx) :
156		       "r" (AC_CONTEXT), "i" (ASI_CONTROL));
157
158  return ctx;
159}
160
161static inline int sun4c_set_context(int ctx)
162{
163  __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
164		       "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
165		       : "memory");
166
167  return ctx;
168}
169
170#endif /* !(__ASSEMBLY__) */
171
172#endif /* !(_SPARC_PGTSUN4C_H) */