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 * 58 * We use 5 bits for the type and 19 for the offset. This gives us 59 * 32 swapfiles of 4GB each. Encoding looks like: 60 * 61 * oooooooooooooooooootttttRRRRRRRR 62 * fedcba9876543210fedcba9876543210 63 * 64 * The bottom 7 bits are reserved for protection and status bits, especially 65 * PRESENT. 66 */ 67 #define SRMMU_SWP_TYPE_MASK 0x1f 68 #define SRMMU_SWP_TYPE_SHIFT 7 69 #define SRMMU_SWP_OFF_MASK 0xfffff 70 #define SRMMU_SWP_OFF_SHIFT (SRMMU_SWP_TYPE_SHIFT + 5) 71 72 /* Some day I will implement true fine grained access bits for 73 * user pages because the SRMMU gives us the capabilities to 74 * enforce all the protection levels that vma's can have. 75 * XXX But for now... 76 */ 77 #define SRMMU_PAGE_NONE __pgprot(SRMMU_CACHE | \ 78 SRMMU_PRIV | SRMMU_REF) 79 #define SRMMU_PAGE_SHARED __pgprot(SRMMU_VALID | SRMMU_CACHE | \ 80 SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF) 81 #define SRMMU_PAGE_COPY __pgprot(SRMMU_VALID | SRMMU_CACHE | \ 82 SRMMU_EXEC | SRMMU_REF) 83 #define SRMMU_PAGE_RDONLY __pgprot(SRMMU_VALID | SRMMU_CACHE | \ 84 SRMMU_EXEC | SRMMU_REF) 85 #define SRMMU_PAGE_KERNEL __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \ 86 SRMMU_DIRTY | SRMMU_REF) 87 88 /* SRMMU Register addresses in ASI 0x4. These are valid for all 89 * current SRMMU implementations that exist. 90 */ 91 #define SRMMU_CTRL_REG 0x00000000 92 #define SRMMU_CTXTBL_PTR 0x00000100 93 #define SRMMU_CTX_REG 0x00000200 94 #define SRMMU_FAULT_STATUS 0x00000300 95 #define SRMMU_FAULT_ADDR 0x00000400 96 97 #define WINDOW_FLUSH(tmp1, tmp2) \ 98 mov 0, tmp1; \ 99 98: ld [%g6 + TI_UWINMASK], tmp2; \ 100 orcc %g0, tmp2, %g0; \ 101 add tmp1, 1, tmp1; \ 102 bne 98b; \ 103 save %sp, -64, %sp; \ 104 99: subcc tmp1, 1, tmp1; \ 105 bne 99b; \ 106 restore %g0, %g0, %g0; 107 108 #ifndef __ASSEMBLY__ 109 extern unsigned long last_valid_pfn; 110 111 /* This makes sense. Honest it does - Anton */ 112 /* XXX Yes but it's ugly as sin. FIXME. -KMW */ 113 extern void *srmmu_nocache_pool; 114 #define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool)) 115 #define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR) 116 #define __nocache_fix(VADDR) __va(__nocache_pa(VADDR)) 117 118 /* Accessing the MMU control register. */ 119 unsigned int srmmu_get_mmureg(void); 120 void srmmu_set_mmureg(unsigned long regval); 121 void srmmu_set_ctable_ptr(unsigned long paddr); 122 void srmmu_set_context(int context); 123 int srmmu_get_context(void); 124 unsigned int srmmu_get_fstatus(void); 125 unsigned int srmmu_get_faddr(void); 126 127 /* This is guaranteed on all SRMMU's. */ 128 static inline void srmmu_flush_whole_tlb(void) 129 { 130 __asm__ __volatile__("sta %%g0, [%0] %1\n\t": : 131 "r" (0x400), /* Flush entire TLB!! */ 132 "i" (ASI_M_FLUSH_PROBE) : "memory"); 133 134 } 135 136 static inline int 137 srmmu_get_pte (unsigned long addr) 138 { 139 register unsigned long entry; 140 141 __asm__ __volatile__("\n\tlda [%1] %2,%0\n\t" : 142 "=r" (entry): 143 "r" ((addr & 0xfffff000) | 0x400), "i" (ASI_M_FLUSH_PROBE)); 144 return entry; 145 } 146 147 #endif /* !(__ASSEMBLY__) */ 148 149 #endif /* !(_SPARC_PGTSRMMU_H) */ 150