2 * Definitions for Sun3 custom MMU.
7 #include <linux/types.h>
9 #include <asm/sun3-head.h>
11 /* MMU characteristics. */
12 #define SUN3_SEGMAPS_PER_CONTEXT 2048
13 #define SUN3_PMEGS_NUM 256
14 #define SUN3_CONTEXTS_NUM 8
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)
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)
24 #define SUN3_CONTROL_MASK (0x0FFFFFFC)
25 #define SUN3_INVALID_PMEG 255
26 #define SUN3_INVALID_CONTEXT 255
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.*/
46 #define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
47 | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
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)
56 /* Mask for page number within PTE. */
57 #define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
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)
71 /* Read bus error status register (implicitly clearing it). */
72 static inline unsigned char sun3_get_buserr(void)
78 GET_CONTROL_BYTE (AC_BUS_ERROR, c);
84 /* Read segmap from hardware MMU. */
85 static inline unsigned long sun3_get_segmap(unsigned long addr)
87 register unsigned long entry;
92 GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
99 /* Write segmap to hardware MMU. */
100 static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
105 SET_DFC (FC_CONTROL);
106 SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
112 /* Read PTE from hardware MMU. */
113 static inline unsigned long sun3_get_pte(unsigned long addr)
115 register unsigned long entry;
119 SET_SFC (FC_CONTROL);
120 GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
126 /* Write PTE to hardware MMU. */
127 static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
132 SET_DFC (FC_CONTROL);
133 SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
139 /* get current context */
140 static inline unsigned char sun3_get_context(void)
142 unsigned char sfc, c;
146 GET_CONTROL_BYTE(AC_CONTEXT, c);
152 /* set alternate context */
153 static inline void sun3_put_context(unsigned char c)
158 SET_CONTROL_BYTE(AC_CONTEXT, c);
164 extern void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
167 extern int sun3_map_test(unsigned long addr, char *val);
169 #endif /* !__ASSEMBLY__ */
171 #endif /* !__SUN3_MMU_H__ */