1 /* 2 * Definitions for Sun3 custom MMU. 3 */ 4 #ifndef __SUN3_MMU_H__ 5 #define __SUN3_MMU_H__ 6 7 #include <linux/types.h> 8 #include <asm/movs.h> 9 #include <asm/sun3-head.h> 10 11 /* MMU characteristics. */ 12 #define SUN3_SEGMAPS_PER_CONTEXT 2048 13 #define SUN3_PMEGS_NUM 256 14 #define SUN3_CONTEXTS_NUM 8 15 16 #define SUN3_PMEG_SIZE_BITS 17 17 #define SUN3_PMEG_SIZE (1 << SUN3_PMEG_SIZE_BITS) 18 #define SUN3_PMEG_MASK (SUN3_PMEG_SIZE - 1) 19 20 #define SUN3_PTE_SIZE_BITS 13 21 #define SUN3_PTE_SIZE (1 << SUN3_PTE_SIZE_BITS) 22 #define SUN3_PTE_MASK (SUN3_PTE_SIZE - 1) 23 24 #define SUN3_CONTROL_MASK (0x0FFFFFFC) 25 #define SUN3_INVALID_PMEG 255 26 #define SUN3_INVALID_CONTEXT 255 27 28 #define AC_IDPROM 0x00000000 /* 34 ID PROM, R/O, byte, 32 bytes */ 29 #define AC_PAGEMAP 0x10000000 /* 3 Pagemap R/W, long */ 30 #define AC_SEGMAP 0x20000000 /* 3 Segment map, byte */ 31 #define AC_CONTEXT 0x30000000 /* 34c current mmu-context */ 32 #define AC_SENABLE 0x40000000 /* 34c system dvma/cache/reset enable reg*/ 33 #define AC_UDVMA_ENB 0x50000000 /* 34 Not used on Sun boards, byte */ 34 #define AC_BUS_ERROR 0x60000000 /* 34 Cleared on read, byte. */ 35 #define AC_SYNC_ERR 0x60000000 /* c fault type */ 36 #define AC_SYNC_VA 0x60000004 /* c fault virtual address */ 37 #define AC_ASYNC_ERR 0x60000008 /* c asynchronous fault type */ 38 #define AC_ASYNC_VA 0x6000000c /* c async fault virtual address */ 39 #define AC_LEDS 0x70000000 /* 34 Zero turns on LEDs, byte */ 40 #define AC_CACHETAGS 0x80000000 /* 34c direct access to the VAC tags */ 41 #define AC_CACHEDDATA 0x90000000 /* 3 c direct access to the VAC data */ 42 #define AC_UDVMA_MAP 0xD0000000 /* 4 Not used on Sun boards, byte */ 43 #define AC_VME_VECTOR 0xE0000000 /* 4 For non-Autovector VME, byte */ 44 #define AC_BOOT_SCC 0xF0000000 /* 34 bypass to access Zilog 8530. byte.*/ 45 46 #define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \ 47 | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED) 48 49 /* Bus access type within PTE. */ 50 #define SUN3_PAGE_TYPE_MASK (0x0c000000) 51 #define SUN3_PAGE_TYPE_MEMORY (0x00000000) 52 #define SUN3_PAGE_TYPE_IO (0x04000000) 53 #define SUN3_PAGE_TYPE_VME16 (0x08000000) 54 #define SUN3_PAGE_TYPE_VME32 (0x0c000000) 55 56 /* Mask for page number within PTE. */ 57 #define SUN3_PAGE_PGNUM_MASK (0x0007FFFF) 58 59 /* Bits within bus-error register. */ 60 #define SUN3_BUSERR_WATCHDOG (0x01) 61 #define SUN3_BUSERR_unused (0x02) 62 #define SUN3_BUSERR_FPAENERR (0x04) 63 #define SUN3_BUSERR_FPABERR (0x08) 64 #define SUN3_BUSERR_VMEBERR (0x10) 65 #define SUN3_BUSERR_TIMEOUT (0x20) 66 #define SUN3_BUSERR_PROTERR (0x40) 67 #define SUN3_BUSERR_INVALID (0x80) 68 69 #ifndef __ASSEMBLY__ 70 71 /* Read bus error status register (implicitly clearing it). */ 72 static inline unsigned char sun3_get_buserr(void) 73 { 74 unsigned char sfc, c; 75 76 GET_SFC (sfc); 77 SET_SFC (FC_CONTROL); 78 GET_CONTROL_BYTE (AC_BUS_ERROR, c); 79 SET_SFC (sfc); 80 81 return c; 82 } 83 84 /* Read segmap from hardware MMU. */ 85 static inline unsigned long sun3_get_segmap(unsigned long addr) 86 { 87 register unsigned long entry; 88 unsigned char c, sfc; 89 90 GET_SFC (sfc); 91 SET_SFC (FC_CONTROL); 92 GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c); 93 SET_SFC (sfc); 94 entry = c; 95 96 return entry; 97 } 98 99 /* Write segmap to hardware MMU. */ 100 static inline void sun3_put_segmap(unsigned long addr, unsigned long entry) 101 { 102 unsigned char sfc; 103 104 GET_DFC (sfc); 105 SET_DFC (FC_CONTROL); 106 SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry); 107 SET_DFC (sfc); 108 109 return; 110 } 111 112 /* Read PTE from hardware MMU. */ 113 static inline unsigned long sun3_get_pte(unsigned long addr) 114 { 115 register unsigned long entry; 116 unsigned char sfc; 117 118 GET_SFC (sfc); 119 SET_SFC (FC_CONTROL); 120 GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry); 121 SET_SFC (sfc); 122 123 return entry; 124 } 125 126 /* Write PTE to hardware MMU. */ 127 static inline void sun3_put_pte(unsigned long addr, unsigned long entry) 128 { 129 unsigned char sfc; 130 131 GET_DFC (sfc); 132 SET_DFC (FC_CONTROL); 133 SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry); 134 SET_DFC (sfc); 135 136 return; 137 } 138 139 /* get current context */ 140 static inline unsigned char sun3_get_context(void) 141 { 142 unsigned char sfc, c; 143 144 GET_SFC(sfc); 145 SET_SFC(FC_CONTROL); 146 GET_CONTROL_BYTE(AC_CONTEXT, c); 147 SET_SFC(sfc); 148 149 return c; 150 } 151 152 /* set alternate context */ 153 static inline void sun3_put_context(unsigned char c) 154 { 155 unsigned char dfc; 156 GET_DFC(dfc); 157 SET_DFC(FC_CONTROL); 158 SET_CONTROL_BYTE(AC_CONTEXT, c); 159 SET_DFC(dfc); 160 161 return; 162 } 163 164 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size, 165 unsigned long type); 166 167 extern int sun3_map_test(unsigned long addr, char *val); 168 169 #endif /* !__ASSEMBLY__ */ 170 171 #endif /* !__SUN3_MMU_H__ */ 172