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) */ 172