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Linux/arch/m68k/include/asm/sun3mmu.h

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  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 

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