1 /* SRMMU page table defines and code,
2 * taken from the SPARC port of Linux
4 * Copyright (C) 2007 Daniel Hellstrom (daniel@gaisler.com)
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 * SPDX-License-Identifier: GPL-2.0+
10 #ifndef __SPARC_SRMMU_H__
11 #define __SPARC_SRMMU_H__
16 /* Number of contexts is implementation-dependent; 64k is the most we support */
17 #define SRMMU_MAX_CONTEXTS 65536
19 /* PMD_SHIFT determines the size of the area a second-level page table entry can map */
20 #define SRMMU_REAL_PMD_SHIFT 18
21 #define SRMMU_REAL_PMD_SIZE (1UL << SRMMU_REAL_PMD_SHIFT)
22 #define SRMMU_REAL_PMD_MASK (~(SRMMU_REAL_PMD_SIZE-1))
23 #define SRMMU_REAL_PMD_ALIGN(__addr) (((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK)
25 /* PGDIR_SHIFT determines what a third-level page table entry can map */
26 #define SRMMU_PGDIR_SHIFT 24
27 #define SRMMU_PGDIR_SIZE (1UL << SRMMU_PGDIR_SHIFT)
28 #define SRMMU_PGDIR_MASK (~(SRMMU_PGDIR_SIZE-1))
29 #define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)
31 #define SRMMU_REAL_PTRS_PER_PTE 64
32 #define SRMMU_REAL_PTRS_PER_PMD 64
33 #define SRMMU_PTRS_PER_PGD 256
35 #define SRMMU_REAL_PTE_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PTE*4)
36 #define SRMMU_PMD_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PMD*4)
37 #define SRMMU_PGD_TABLE_SIZE (SRMMU_PTRS_PER_PGD*4)
40 * To support pagetables in highmem, Linux introduces APIs which
41 * return struct page* and generally manipulate page tables when
42 * they are not mapped into kernel space. Our hardware page tables
43 * are smaller than pages. We lump hardware tabes into big, page sized
46 * PMD_SHIFT determines the size of the area a second-level page table entry
47 * can map, and our pmd_t is 16 times larger than normal. The values which
48 * were once defined here are now generic for 4c and srmmu, so they're
51 #define SRMMU_PTRS_PER_PMD 4
53 /* Definition of the values in the ET field of PTD's and PTE's */
54 #define SRMMU_ET_MASK 0x3
55 #define SRMMU_ET_INVALID 0x0
56 #define SRMMU_ET_PTD 0x1
57 #define SRMMU_ET_PTE 0x2
58 #define SRMMU_ET_REPTE 0x3 /* AIEEE, SuperSparc II reverse endian page! */
60 /* Physical page extraction from PTP's and PTE's. */
61 #define SRMMU_CTX_PMASK 0xfffffff0
62 #define SRMMU_PTD_PMASK 0xfffffff0
63 #define SRMMU_PTE_PMASK 0xffffff00
65 /* The pte non-page bits. Some notes:
66 * 1) cache, dirty, valid, and ref are frobbable
67 * for both supervisor and user pages.
68 * 2) exec and write will only give the desired effect
70 * 3) use priv and priv_readonly for changing the
71 * characteristics of supervisor ptes
73 #define SRMMU_CACHE 0x80
74 #define SRMMU_DIRTY 0x40
75 #define SRMMU_REF 0x20
76 #define SRMMU_NOREAD 0x10
77 #define SRMMU_EXEC 0x08
78 #define SRMMU_WRITE 0x04
79 #define SRMMU_VALID 0x02 /* SRMMU_ET_PTE */
80 #define SRMMU_PRIV 0x1c
81 #define SRMMU_PRIV_RDONLY 0x18
83 #define SRMMU_FILE 0x40 /* Implemented in software */
85 #define SRMMU_PTE_FILE_SHIFT 8 /* == 32-PTE_FILE_MAX_BITS */
87 #define SRMMU_CHG_MASK (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)
89 /* SRMMU swap entry encoding
91 * We use 5 bits for the type and 19 for the offset. This gives us
92 * 32 swapfiles of 4GB each. Encoding looks like:
94 * oooooooooooooooooootttttRRRRRRRR
95 * fedcba9876543210fedcba9876543210
97 * The bottom 8 bits are reserved for protection and status bits, especially
100 #define SRMMU_SWP_TYPE_MASK 0x1f
101 #define SRMMU_SWP_TYPE_SHIFT SRMMU_PTE_FILE_SHIFT
102 #define SRMMU_SWP_OFF_MASK 0x7ffff
103 #define SRMMU_SWP_OFF_SHIFT (SRMMU_PTE_FILE_SHIFT + 5)
105 /* Some day I will implement true fine grained access bits for
106 * user pages because the SRMMU gives us the capabilities to
107 * enforce all the protection levels that vma's can have.
110 #define SRMMU_PAGE_NONE __pgprot(SRMMU_CACHE | \
111 SRMMU_PRIV | SRMMU_REF)
112 #define SRMMU_PAGE_SHARED __pgprot(SRMMU_VALID | SRMMU_CACHE | \
113 SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)
114 #define SRMMU_PAGE_COPY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
115 SRMMU_EXEC | SRMMU_REF)
116 #define SRMMU_PAGE_RDONLY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
117 SRMMU_EXEC | SRMMU_REF)
118 #define SRMMU_PAGE_KERNEL __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \
119 SRMMU_DIRTY | SRMMU_REF)
121 /* SRMMU Register addresses in ASI 0x4. These are valid for all
122 * current SRMMU implementations that exist.
124 #define SRMMU_CTRL_REG 0x00000000
125 #define SRMMU_CTXTBL_PTR 0x00000100
126 #define SRMMU_CTX_REG 0x00000200
127 #define SRMMU_FAULT_STATUS 0x00000300
128 #define SRMMU_FAULT_ADDR 0x00000400
130 #define WINDOW_FLUSH(tmp1, tmp2) \
132 98: ld [%g6 + TI_UWINMASK], tmp2; \
133 orcc %g0, tmp2, %g0; \
136 save %sp, -64, %sp; \
137 99: subcc tmp1, 1, tmp1; \
139 restore %g0, %g0, %g0;
143 /* This makes sense. Honest it does - Anton */
144 /* XXX Yes but it's ugly as sin. FIXME. -KMW */
145 extern void *srmmu_nocache_pool;
146 #define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
147 #define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
148 #define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))
150 /* Accessing the MMU control register. */
151 static __inline__ unsigned int srmmu_get_mmureg(void)
154 __asm__ __volatile__("lda [%%g0] %1, %0\n\t":
155 "=r"(retval):"i"(ASI_M_MMUREGS));
159 static __inline__ void srmmu_set_mmureg(unsigned long regval)
161 __asm__ __volatile__("sta %0, [%%g0] %1\n\t"::"r"(regval),
162 "i"(ASI_M_MMUREGS):"memory");
166 static __inline__ void srmmu_set_ctable_ptr(unsigned long paddr)
168 paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
169 __asm__ __volatile__("sta %0, [%1] %2\n\t"::"r"(paddr),
170 "r"(SRMMU_CTXTBL_PTR),
171 "i"(ASI_M_MMUREGS):"memory");
174 static __inline__ unsigned long srmmu_get_ctable_ptr(void)
178 __asm__ __volatile__("lda [%1] %2, %0\n\t":
180 "r"(SRMMU_CTXTBL_PTR), "i"(ASI_M_MMUREGS));
181 return (retval & SRMMU_CTX_PMASK) << 4;
184 static __inline__ void srmmu_set_context(int context)
186 __asm__ __volatile__("sta %0, [%1] %2\n\t"::"r"(context),
187 "r"(SRMMU_CTX_REG), "i"(ASI_M_MMUREGS):"memory");
190 static __inline__ int srmmu_get_context(void)
193 __asm__ __volatile__("lda [%1] %2, %0\n\t":
195 "r"(SRMMU_CTX_REG), "i"(ASI_M_MMUREGS));
199 static __inline__ unsigned int srmmu_get_fstatus(void)
203 __asm__ __volatile__("lda [%1] %2, %0\n\t":
205 "r"(SRMMU_FAULT_STATUS), "i"(ASI_M_MMUREGS));
209 static __inline__ unsigned int srmmu_get_faddr(void)
213 __asm__ __volatile__("lda [%1] %2, %0\n\t":
215 "r"(SRMMU_FAULT_ADDR), "i"(ASI_M_MMUREGS));
219 /* This is guaranteed on all SRMMU's. */
220 static __inline__ void srmmu_flush_whole_tlb(void)
222 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x400), /* Flush entire TLB!! */
223 "i"(ASI_M_FLUSH_PROBE):"memory");
227 /* These flush types are not available on all chips... */
228 static __inline__ void srmmu_flush_tlb_ctx(void)
230 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x300), /* Flush TLB ctx.. */
231 "i"(ASI_M_FLUSH_PROBE):"memory");
235 static __inline__ void srmmu_flush_tlb_region(unsigned long addr)
237 addr &= SRMMU_PGDIR_MASK;
238 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(addr | 0x200), /* Flush TLB region.. */
239 "i"(ASI_M_FLUSH_PROBE):"memory");
243 static __inline__ void srmmu_flush_tlb_segment(unsigned long addr)
245 addr &= SRMMU_REAL_PMD_MASK;
246 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(addr | 0x100), /* Flush TLB segment.. */
247 "i"(ASI_M_FLUSH_PROBE):"memory");
251 static __inline__ void srmmu_flush_tlb_page(unsigned long page)
254 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(page), /* Flush TLB page.. */
255 "i"(ASI_M_FLUSH_PROBE):"memory");
259 static __inline__ unsigned long srmmu_hwprobe(unsigned long vaddr)
261 unsigned long retval;
264 __asm__ __volatile__("lda [%1] %2, %0\n\t":
266 "r"(vaddr | 0x400), "i"(ASI_M_FLUSH_PROBE));
271 static __inline__ int srmmu_get_pte(unsigned long addr)
273 register unsigned long entry;
275 __asm__ __volatile__("\n\tlda [%1] %2,%0\n\t":
277 "r"((addr & 0xfffff000) | 0x400),
278 "i"(ASI_M_FLUSH_PROBE));
282 extern unsigned long (*srmmu_read_physical) (unsigned long paddr);
283 extern void (*srmmu_write_physical) (unsigned long paddr, unsigned long word);
285 #endif /* !(__ASSEMBLY__) */
287 #endif /* !(__SPARC_SRMMU_H__) */