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) */ 173