1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * pgtsrmmu.h: SRMMU page table defines and code.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #ifndef _SPARC_PGTSRMMU_H
9 #define _SPARC_PGTSRMMU_H
10
11 #include <asm/page.h>
12
13 #ifdef __ASSEMBLY__
14 #include <asm/thread_info.h> /* TI_UWINMASK for WINDOW_FLUSH */
15 #endif
16
17 /* Number of contexts is implementation-dependent; 64k is the most we support */
18 #define SRMMU_MAX_CONTEXTS 65536
19
20 #define SRMMU_PTE_TABLE_SIZE (PTRS_PER_PTE*4)
21 #define SRMMU_PMD_TABLE_SIZE (PTRS_PER_PMD*4)
22 #define SRMMU_PGD_TABLE_SIZE (PTRS_PER_PGD*4)
23
24 /* Definition of the values in the ET field of PTD's and PTE's */
25 #define SRMMU_ET_MASK 0x3
26 #define SRMMU_ET_INVALID 0x0
27 #define SRMMU_ET_PTD 0x1
28 #define SRMMU_ET_PTE 0x2
29 #define SRMMU_ET_REPTE 0x3 /* AIEEE, SuperSparc II reverse endian page! */
30
31 /* Physical page extraction from PTP's and PTE's. */
32 #define SRMMU_CTX_PMASK 0xfffffff0
33 #define SRMMU_PTD_PMASK 0xfffffff0
34 #define SRMMU_PTE_PMASK 0xffffff00
35
36 /* The pte non-page bits. Some notes:
37 * 1) cache, dirty, valid, and ref are frobbable
38 * for both supervisor and user pages.
39 * 2) exec and write will only give the desired effect
40 * on user pages
41 * 3) use priv and priv_readonly for changing the
42 * characteristics of supervisor ptes
43 */
44 #define SRMMU_CACHE 0x80
45 #define SRMMU_DIRTY 0x40
46 #define SRMMU_REF 0x20
47 #define SRMMU_NOREAD 0x10
48 #define SRMMU_EXEC 0x08
49 #define SRMMU_WRITE 0x04
50 #define SRMMU_VALID 0x02 /* SRMMU_ET_PTE */
51 #define SRMMU_PRIV 0x1c
52 #define SRMMU_PRIV_RDONLY 0x18
53
54 #define SRMMU_CHG_MASK (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)
55
56 /* SRMMU swap entry encoding */
57 #define SRMMU_SWP_TYPE_MASK 0x1f
58 #define SRMMU_SWP_TYPE_SHIFT 7
59 #define SRMMU_SWP_OFF_MASK 0xfffff
60 #define SRMMU_SWP_OFF_SHIFT (SRMMU_SWP_TYPE_SHIFT + 5)
61 /* We borrow bit 6 to store the exclusive marker in swap PTEs. */
62 #define SRMMU_SWP_EXCLUSIVE SRMMU_DIRTY
63
64 /* Some day I will implement true fine grained access bits for
65 * user pages because the SRMMU gives us the capabilities to
66 * enforce all the protection levels that vma's can have.
67 * XXX But for now...
68 */
69 #define SRMMU_PAGE_NONE __pgprot(SRMMU_CACHE | \
70 SRMMU_PRIV | SRMMU_REF)
71 #define SRMMU_PAGE_SHARED __pgprot(SRMMU_VALID | SRMMU_CACHE | \
72 SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)
73 #define SRMMU_PAGE_COPY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
74 SRMMU_EXEC | SRMMU_REF)
75 #define SRMMU_PAGE_RDONLY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
76 SRMMU_EXEC | SRMMU_REF)
77 #define SRMMU_PAGE_KERNEL __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \
78 SRMMU_DIRTY | SRMMU_REF)
79
80 /* SRMMU Register addresses in ASI 0x4. These are valid for all
81 * current SRMMU implementations that exist.
82 */
83 #define SRMMU_CTRL_REG 0x00000000
84 #define SRMMU_CTXTBL_PTR 0x00000100
85 #define SRMMU_CTX_REG 0x00000200
86 #define SRMMU_FAULT_STATUS 0x00000300
87 #define SRMMU_FAULT_ADDR 0x00000400
88
89 #define WINDOW_FLUSH(tmp1, tmp2) \
90 mov 0, tmp1; \
91 98: ld [%g6 + TI_UWINMASK], tmp2; \
92 orcc %g0, tmp2, %g0; \
93 add tmp1, 1, tmp1; \
94 bne 98b; \
95 save %sp, -64, %sp; \
96 99: subcc tmp1, 1, tmp1; \
97 bne 99b; \
98 restore %g0, %g0, %g0;
99
100 #ifndef __ASSEMBLY__
101 extern unsigned long last_valid_pfn;
102
103 /* This makes sense. Honest it does - Anton */
104 /* XXX Yes but it's ugly as sin. FIXME. -KMW */
105 extern void *srmmu_nocache_pool;
106 #define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
107 #define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
108 #define __nocache_fix(VADDR) ((__typeof__(VADDR))__va(__nocache_pa(VADDR)))
109
110 /* Accessing the MMU control register. */
111 unsigned int srmmu_get_mmureg(void);
112 void srmmu_set_mmureg(unsigned long regval);
113 void srmmu_set_ctable_ptr(unsigned long paddr);
114 void srmmu_set_context(int context);
115 int srmmu_get_context(void);
116 unsigned int srmmu_get_fstatus(void);
117 unsigned int srmmu_get_faddr(void);
118
119 /* This is guaranteed on all SRMMU's. */
srmmu_flush_whole_tlb(void)120 static inline void srmmu_flush_whole_tlb(void)
121 {
122 __asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
123 "r" (0x400), /* Flush entire TLB!! */
124 "i" (ASI_M_FLUSH_PROBE) : "memory");
125
126 }
127
128 static inline int
srmmu_get_pte(unsigned long addr)129 srmmu_get_pte (unsigned long addr)
130 {
131 register unsigned long entry;
132
133 __asm__ __volatile__("\n\tlda [%1] %2,%0\n\t" :
134 "=r" (entry):
135 "r" ((addr & 0xfffff000) | 0x400), "i" (ASI_M_FLUSH_PROBE));
136 return entry;
137 }
138
139 #endif /* !(__ASSEMBLY__) */
140
141 #endif /* !(_SPARC_PGTSRMMU_H) */
142