1 /* 2 * linux/arch/sparc/mm/leon_m.c 3 * 4 * Copyright (C) 2004 Konrad Eisele (eiselekd@web.de, konrad@gaisler.com) Gaisler Research 5 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB 6 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB 7 * 8 * do srmmu probe in software 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/mm.h> 14 #include <asm/asi.h> 15 #include <asm/leon.h> 16 #include <asm/tlbflush.h> 17 18 int leon_flush_during_switch = 1; 19 int srmmu_swprobe_trace; 20 21 unsigned long srmmu_swprobe(unsigned long vaddr, unsigned long *paddr) 22 { 23 24 unsigned int ctxtbl; 25 unsigned int pgd, pmd, ped; 26 unsigned int ptr; 27 unsigned int lvl, pte, paddrbase; 28 unsigned int ctx; 29 unsigned int paddr_calc; 30 31 paddrbase = 0; 32 33 if (srmmu_swprobe_trace) 34 printk(KERN_INFO "swprobe: trace on\n"); 35 36 ctxtbl = srmmu_get_ctable_ptr(); 37 if (!(ctxtbl)) { 38 if (srmmu_swprobe_trace) 39 printk(KERN_INFO "swprobe: srmmu_get_ctable_ptr returned 0=>0\n"); 40 return 0; 41 } 42 if (!_pfn_valid(PFN(ctxtbl))) { 43 if (srmmu_swprobe_trace) 44 printk(KERN_INFO 45 "swprobe: !_pfn_valid(%x)=>0\n", 46 PFN(ctxtbl)); 47 return 0; 48 } 49 50 ctx = srmmu_get_context(); 51 if (srmmu_swprobe_trace) 52 printk(KERN_INFO "swprobe: --- ctx (%x) ---\n", ctx); 53 54 pgd = LEON_BYPASS_LOAD_PA(ctxtbl + (ctx * 4)); 55 56 if (((pgd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) { 57 if (srmmu_swprobe_trace) 58 printk(KERN_INFO "swprobe: pgd is entry level 3\n"); 59 lvl = 3; 60 pte = pgd; 61 paddrbase = pgd & _SRMMU_PTE_PMASK_LEON; 62 goto ready; 63 } 64 if (((pgd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) { 65 if (srmmu_swprobe_trace) 66 printk(KERN_INFO "swprobe: pgd is invalid => 0\n"); 67 return 0; 68 } 69 70 if (srmmu_swprobe_trace) 71 printk(KERN_INFO "swprobe: --- pgd (%x) ---\n", pgd); 72 73 ptr = (pgd & SRMMU_PTD_PMASK) << 4; 74 ptr += ((((vaddr) >> LEON_PGD_SH) & LEON_PGD_M) * 4); 75 if (!_pfn_valid(PFN(ptr))) 76 return 0; 77 78 pmd = LEON_BYPASS_LOAD_PA(ptr); 79 if (((pmd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) { 80 if (srmmu_swprobe_trace) 81 printk(KERN_INFO "swprobe: pmd is entry level 2\n"); 82 lvl = 2; 83 pte = pmd; 84 paddrbase = pmd & _SRMMU_PTE_PMASK_LEON; 85 goto ready; 86 } 87 if (((pmd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) { 88 if (srmmu_swprobe_trace) 89 printk(KERN_INFO "swprobe: pmd is invalid => 0\n"); 90 return 0; 91 } 92 93 if (srmmu_swprobe_trace) 94 printk(KERN_INFO "swprobe: --- pmd (%x) ---\n", pmd); 95 96 ptr = (pmd & SRMMU_PTD_PMASK) << 4; 97 ptr += (((vaddr >> LEON_PMD_SH) & LEON_PMD_M) * 4); 98 if (!_pfn_valid(PFN(ptr))) { 99 if (srmmu_swprobe_trace) 100 printk(KERN_INFO "swprobe: !_pfn_valid(%x)=>0\n", 101 PFN(ptr)); 102 return 0; 103 } 104 105 ped = LEON_BYPASS_LOAD_PA(ptr); 106 107 if (((ped & SRMMU_ET_MASK) == SRMMU_ET_PTE)) { 108 if (srmmu_swprobe_trace) 109 printk(KERN_INFO "swprobe: ped is entry level 1\n"); 110 lvl = 1; 111 pte = ped; 112 paddrbase = ped & _SRMMU_PTE_PMASK_LEON; 113 goto ready; 114 } 115 if (((ped & SRMMU_ET_MASK) != SRMMU_ET_PTD)) { 116 if (srmmu_swprobe_trace) 117 printk(KERN_INFO "swprobe: ped is invalid => 0\n"); 118 return 0; 119 } 120 121 if (srmmu_swprobe_trace) 122 printk(KERN_INFO "swprobe: --- ped (%x) ---\n", ped); 123 124 ptr = (ped & SRMMU_PTD_PMASK) << 4; 125 ptr += (((vaddr >> LEON_PTE_SH) & LEON_PTE_M) * 4); 126 if (!_pfn_valid(PFN(ptr))) 127 return 0; 128 129 ptr = LEON_BYPASS_LOAD_PA(ptr); 130 if (((ptr & SRMMU_ET_MASK) == SRMMU_ET_PTE)) { 131 if (srmmu_swprobe_trace) 132 printk(KERN_INFO "swprobe: ptr is entry level 0\n"); 133 lvl = 0; 134 pte = ptr; 135 paddrbase = ptr & _SRMMU_PTE_PMASK_LEON; 136 goto ready; 137 } 138 if (srmmu_swprobe_trace) 139 printk(KERN_INFO "swprobe: ptr is invalid => 0\n"); 140 return 0; 141 142 ready: 143 switch (lvl) { 144 case 0: 145 paddr_calc = 146 (vaddr & ~(-1 << LEON_PTE_SH)) | ((pte & ~0xff) << 4); 147 break; 148 case 1: 149 paddr_calc = 150 (vaddr & ~(-1 << LEON_PMD_SH)) | ((pte & ~0xff) << 4); 151 break; 152 case 2: 153 paddr_calc = 154 (vaddr & ~(-1 << LEON_PGD_SH)) | ((pte & ~0xff) << 4); 155 break; 156 default: 157 case 3: 158 paddr_calc = vaddr; 159 break; 160 } 161 if (srmmu_swprobe_trace) 162 printk(KERN_INFO "swprobe: padde %x\n", paddr_calc); 163 if (paddr) 164 *paddr = paddr_calc; 165 return pte; 166 } 167 168 void leon_flush_icache_all(void) 169 { 170 __asm__ __volatile__(" flush "); /*iflush*/ 171 } 172 173 void leon_flush_dcache_all(void) 174 { 175 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : : 176 "i"(ASI_LEON_DFLUSH) : "memory"); 177 } 178 179 void leon_flush_pcache_all(struct vm_area_struct *vma, unsigned long page) 180 { 181 if (vma->vm_flags & VM_EXEC) 182 leon_flush_icache_all(); 183 leon_flush_dcache_all(); 184 } 185 186 void leon_flush_cache_all(void) 187 { 188 __asm__ __volatile__(" flush "); /*iflush*/ 189 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : : 190 "i"(ASI_LEON_DFLUSH) : "memory"); 191 } 192 193 void leon_flush_tlb_all(void) 194 { 195 leon_flush_cache_all(); 196 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : "r"(0x400), 197 "i"(ASI_LEON_MMUFLUSH) : "memory"); 198 } 199 200 /* get all cache regs */ 201 void leon3_getCacheRegs(struct leon3_cacheregs *regs) 202 { 203 unsigned long ccr, iccr, dccr; 204 205 if (!regs) 206 return; 207 /* Get Cache regs from "Cache ASI" address 0x0, 0x8 and 0xC */ 208 __asm__ __volatile__("lda [%%g0] %3, %0\n\t" 209 "mov 0x08, %%g1\n\t" 210 "lda [%%g1] %3, %1\n\t" 211 "mov 0x0c, %%g1\n\t" 212 "lda [%%g1] %3, %2\n\t" 213 : "=r"(ccr), "=r"(iccr), "=r"(dccr) 214 /* output */ 215 : "i"(ASI_LEON_CACHEREGS) /* input */ 216 : "g1" /* clobber list */ 217 ); 218 regs->ccr = ccr; 219 regs->iccr = iccr; 220 regs->dccr = dccr; 221 } 222 223 /* Due to virtual cache we need to check cache configuration if 224 * it is possible to skip flushing in some cases. 225 * 226 * Leon2 and Leon3 differ in their way of telling cache information 227 * 228 */ 229 int __init leon_flush_needed(void) 230 { 231 int flush_needed = -1; 232 unsigned int ssize, sets; 233 char *setStr[4] = 234 { "direct mapped", "2-way associative", "3-way associative", 235 "4-way associative" 236 }; 237 /* leon 3 */ 238 struct leon3_cacheregs cregs; 239 leon3_getCacheRegs(&cregs); 240 sets = (cregs.dccr & LEON3_XCCR_SETS_MASK) >> 24; 241 /* (ssize=>realsize) 0=>1k, 1=>2k, 2=>4k, 3=>8k ... */ 242 ssize = 1 << ((cregs.dccr & LEON3_XCCR_SSIZE_MASK) >> 20); 243 244 printk(KERN_INFO "CACHE: %s cache, set size %dk\n", 245 sets > 3 ? "unknown" : setStr[sets], ssize); 246 if ((ssize <= (PAGE_SIZE / 1024)) && (sets == 0)) { 247 /* Set Size <= Page size ==> 248 flush on every context switch not needed. */ 249 flush_needed = 0; 250 printk(KERN_INFO "CACHE: not flushing on every context switch\n"); 251 } 252 return flush_needed; 253 } 254 255 void leon_switch_mm(void) 256 { 257 flush_tlb_mm((void *)0); 258 if (leon_flush_during_switch) 259 leon_flush_cache_all(); 260 } 261