Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m32r/mm/fault.c |
| 3 | * |
| 4 | * Copyright (c) 2001, 2002 Hitoshi Yamamoto, and H. Kondo |
| 5 | * Copyright (c) 2004 Naoto Sugai, NIIBE Yutaka |
| 6 | * |
| 7 | * Some code taken from i386 version. |
| 8 | * Copyright (C) 1995 Linus Torvalds |
| 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/signal.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/ptrace.h> |
| 18 | #include <linux/mman.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/tty.h> |
| 24 | #include <linux/vt_kern.h> /* For unblank_screen() */ |
| 25 | #include <linux/highmem.h> |
| 26 | #include <linux/module.h> |
| 27 | |
| 28 | #include <asm/m32r.h> |
| 29 | #include <asm/system.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/hardirq.h> |
| 32 | #include <asm/mmu_context.h> |
| 33 | #include <asm/tlbflush.h> |
| 34 | |
| 35 | extern void die(const char *, struct pt_regs *, long); |
| 36 | |
| 37 | #ifndef CONFIG_SMP |
| 38 | asmlinkage unsigned int tlb_entry_i_dat; |
| 39 | asmlinkage unsigned int tlb_entry_d_dat; |
| 40 | #define tlb_entry_i tlb_entry_i_dat |
| 41 | #define tlb_entry_d tlb_entry_d_dat |
| 42 | #else |
| 43 | unsigned int tlb_entry_i_dat[NR_CPUS]; |
| 44 | unsigned int tlb_entry_d_dat[NR_CPUS]; |
| 45 | #define tlb_entry_i tlb_entry_i_dat[smp_processor_id()] |
| 46 | #define tlb_entry_d tlb_entry_d_dat[smp_processor_id()] |
| 47 | #endif |
| 48 | |
| 49 | extern void init_tlb(void); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /*======================================================================* |
| 52 | * do_page_fault() |
| 53 | *======================================================================* |
| 54 | * This routine handles page faults. It determines the address, |
| 55 | * and the problem, and then passes it off to one of the appropriate |
| 56 | * routines. |
| 57 | * |
| 58 | * ARGUMENT: |
| 59 | * regs : M32R SP reg. |
| 60 | * error_code : See below |
| 61 | * address : M32R MMU MDEVA reg. (Operand ACE) |
| 62 | * : M32R BPC reg. (Instruction ACE) |
| 63 | * |
| 64 | * error_code : |
| 65 | * bit 0 == 0 means no page found, 1 means protection fault |
| 66 | * bit 1 == 0 means read, 1 means write |
| 67 | * bit 2 == 0 means kernel, 1 means user-mode |
| 68 | * bit 3 == 0 means data, 1 means instruction |
| 69 | *======================================================================*/ |
| 70 | #define ACE_PROTECTION 1 |
| 71 | #define ACE_WRITE 2 |
| 72 | #define ACE_USERMODE 4 |
| 73 | #define ACE_INSTRUCTION 8 |
| 74 | |
| 75 | asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, |
| 76 | unsigned long address) |
| 77 | { |
| 78 | struct task_struct *tsk; |
| 79 | struct mm_struct *mm; |
| 80 | struct vm_area_struct * vma; |
| 81 | unsigned long page, addr; |
| 82 | int write; |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 83 | int fault; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | siginfo_t info; |
| 85 | |
| 86 | /* |
| 87 | * If BPSW IE bit enable --> set PSW IE bit |
| 88 | */ |
| 89 | if (regs->psw & M32R_PSW_BIE) |
| 90 | local_irq_enable(); |
| 91 | |
| 92 | tsk = current; |
| 93 | |
| 94 | info.si_code = SEGV_MAPERR; |
| 95 | |
| 96 | /* |
| 97 | * We fault-in kernel-space virtual memory on-demand. The |
| 98 | * 'reference' page table is init_mm.pgd. |
| 99 | * |
| 100 | * NOTE! We MUST NOT take any locks for this case. We may |
| 101 | * be in an interrupt or a critical region, and should |
| 102 | * only copy the information from the master page table, |
| 103 | * nothing more. |
| 104 | * |
| 105 | * This verifies that the fault happens in kernel space |
| 106 | * (error_code & ACE_USERMODE) == 0, and that the fault was not a |
| 107 | * protection error (error_code & ACE_PROTECTION) == 0. |
| 108 | */ |
| 109 | if (address >= TASK_SIZE && !(error_code & ACE_USERMODE)) |
| 110 | goto vmalloc_fault; |
| 111 | |
| 112 | mm = tsk->mm; |
| 113 | |
| 114 | /* |
| 115 | * If we're in an interrupt or have no user context or are running in an |
| 116 | * atomic region then we must not take the fault.. |
| 117 | */ |
| 118 | if (in_atomic() || !mm) |
| 119 | goto bad_area_nosemaphore; |
| 120 | |
| 121 | /* When running in the kernel we expect faults to occur only to |
| 122 | * addresses in user space. All other faults represent errors in the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 123 | * kernel and should generate an OOPS. Unfortunately, in the case of an |
Adrian Bunk | 80f7228 | 2006-06-30 18:27:16 +0200 | [diff] [blame] | 124 | * erroneous fault occurring in a code path which already holds mmap_sem |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | * we will deadlock attempting to validate the fault against the |
| 126 | * address space. Luckily the kernel only validly references user |
| 127 | * space from well defined areas of code, which are listed in the |
| 128 | * exceptions table. |
| 129 | * |
| 130 | * As the vast majority of faults will be valid we will only perform |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 131 | * the source reference check when there is a possibility of a deadlock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | * Attempt to lock the address space, if we cannot we then validate the |
| 133 | * source. If this is invalid we can skip the address space check, |
| 134 | * thus avoiding the deadlock. |
| 135 | */ |
| 136 | if (!down_read_trylock(&mm->mmap_sem)) { |
| 137 | if ((error_code & ACE_USERMODE) == 0 && |
| 138 | !search_exception_tables(regs->psw)) |
| 139 | goto bad_area_nosemaphore; |
| 140 | down_read(&mm->mmap_sem); |
| 141 | } |
| 142 | |
| 143 | vma = find_vma(mm, address); |
| 144 | if (!vma) |
| 145 | goto bad_area; |
| 146 | if (vma->vm_start <= address) |
| 147 | goto good_area; |
| 148 | if (!(vma->vm_flags & VM_GROWSDOWN)) |
| 149 | goto bad_area; |
Hirokazu Takata | 6b8bd3f | 2006-12-08 02:35:56 -0800 | [diff] [blame] | 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | if (error_code & ACE_USERMODE) { |
| 152 | /* |
| 153 | * accessing the stack below "spu" is always a bug. |
| 154 | * The "+ 4" is there due to the push instruction |
| 155 | * doing pre-decrement on the stack and that |
| 156 | * doesn't show up until later.. |
| 157 | */ |
| 158 | if (address + 4 < regs->spu) |
| 159 | goto bad_area; |
| 160 | } |
Hirokazu Takata | 6b8bd3f | 2006-12-08 02:35:56 -0800 | [diff] [blame] | 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (expand_stack(vma, address)) |
| 163 | goto bad_area; |
| 164 | /* |
| 165 | * Ok, we have a good vm_area for this memory access, so |
| 166 | * we can handle it.. |
| 167 | */ |
| 168 | good_area: |
| 169 | info.si_code = SEGV_ACCERR; |
| 170 | write = 0; |
| 171 | switch (error_code & (ACE_WRITE|ACE_PROTECTION)) { |
| 172 | default: /* 3: write, present */ |
| 173 | /* fall through */ |
| 174 | case ACE_WRITE: /* write, not present */ |
| 175 | if (!(vma->vm_flags & VM_WRITE)) |
| 176 | goto bad_area; |
| 177 | write++; |
| 178 | break; |
| 179 | case ACE_PROTECTION: /* read, present */ |
| 180 | case 0: /* read, not present */ |
| 181 | if (!(vma->vm_flags & (VM_READ | VM_EXEC))) |
| 182 | goto bad_area; |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * For instruction access exception, check if the area is executable |
| 187 | */ |
| 188 | if ((error_code & ACE_INSTRUCTION) && !(vma->vm_flags & VM_EXEC)) |
| 189 | goto bad_area; |
| 190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | /* |
| 192 | * If for any reason at all we couldn't handle the fault, |
| 193 | * make sure we exit gracefully rather than endlessly redo |
| 194 | * the fault. |
| 195 | */ |
| 196 | addr = (address & PAGE_MASK); |
| 197 | set_thread_fault_code(error_code); |
Linus Torvalds | d06063c | 2009-04-10 09:01:23 -0700 | [diff] [blame] | 198 | fault = handle_mm_fault(mm, vma, addr, write ? FAULT_FLAG_WRITE : 0); |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 199 | if (unlikely(fault & VM_FAULT_ERROR)) { |
| 200 | if (fault & VM_FAULT_OOM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | goto out_of_memory; |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 202 | else if (fault & VM_FAULT_SIGBUS) |
| 203 | goto do_sigbus; |
| 204 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 206 | if (fault & VM_FAULT_MAJOR) |
| 207 | tsk->maj_flt++; |
| 208 | else |
| 209 | tsk->min_flt++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | set_thread_fault_code(0); |
| 211 | up_read(&mm->mmap_sem); |
| 212 | return; |
| 213 | |
| 214 | /* |
| 215 | * Something tried to access memory that isn't in our memory map.. |
| 216 | * Fix it, but check if it's kernel or user first.. |
| 217 | */ |
| 218 | bad_area: |
| 219 | up_read(&mm->mmap_sem); |
| 220 | |
| 221 | bad_area_nosemaphore: |
| 222 | /* User mode accesses just cause a SIGSEGV */ |
| 223 | if (error_code & ACE_USERMODE) { |
| 224 | tsk->thread.address = address; |
| 225 | tsk->thread.error_code = error_code | (address >= TASK_SIZE); |
| 226 | tsk->thread.trap_no = 14; |
| 227 | info.si_signo = SIGSEGV; |
| 228 | info.si_errno = 0; |
| 229 | /* info.si_code has been set above */ |
| 230 | info.si_addr = (void __user *)address; |
| 231 | force_sig_info(SIGSEGV, &info, tsk); |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | no_context: |
| 236 | /* Are we prepared to handle this kernel fault? */ |
| 237 | if (fixup_exception(regs)) |
| 238 | return; |
| 239 | |
| 240 | /* |
| 241 | * Oops. The kernel tried to access some bad page. We'll have to |
| 242 | * terminate things with extreme prejudice. |
| 243 | */ |
| 244 | |
| 245 | bust_spinlocks(1); |
| 246 | |
| 247 | if (address < PAGE_SIZE) |
| 248 | printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); |
| 249 | else |
| 250 | printk(KERN_ALERT "Unable to handle kernel paging request"); |
| 251 | printk(" at virtual address %08lx\n",address); |
| 252 | printk(KERN_ALERT " printing bpc:\n"); |
| 253 | printk("%08lx\n", regs->bpc); |
| 254 | page = *(unsigned long *)MPTB; |
| 255 | page = ((unsigned long *) page)[address >> PGDIR_SHIFT]; |
| 256 | printk(KERN_ALERT "*pde = %08lx\n", page); |
| 257 | if (page & _PAGE_PRESENT) { |
| 258 | page &= PAGE_MASK; |
| 259 | address &= 0x003ff000; |
| 260 | page = ((unsigned long *) __va(page))[address >> PAGE_SHIFT]; |
| 261 | printk(KERN_ALERT "*pte = %08lx\n", page); |
| 262 | } |
| 263 | die("Oops", regs, error_code); |
| 264 | bust_spinlocks(0); |
| 265 | do_exit(SIGKILL); |
| 266 | |
| 267 | /* |
| 268 | * We ran out of memory, or some other thing happened to us that made |
| 269 | * us unable to handle the page fault gracefully. |
| 270 | */ |
| 271 | out_of_memory: |
| 272 | up_read(&mm->mmap_sem); |
Nick Piggin | 68db30c | 2010-06-04 14:14:49 -0700 | [diff] [blame] | 273 | if (!(error_code & ACE_USERMODE)) |
| 274 | goto no_context; |
| 275 | pagefault_out_of_memory(); |
| 276 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
| 278 | do_sigbus: |
| 279 | up_read(&mm->mmap_sem); |
| 280 | |
| 281 | /* Kernel mode? Handle exception or die */ |
| 282 | if (!(error_code & ACE_USERMODE)) |
| 283 | goto no_context; |
| 284 | |
| 285 | tsk->thread.address = address; |
| 286 | tsk->thread.error_code = error_code; |
| 287 | tsk->thread.trap_no = 14; |
| 288 | info.si_signo = SIGBUS; |
| 289 | info.si_errno = 0; |
| 290 | info.si_code = BUS_ADRERR; |
| 291 | info.si_addr = (void __user *)address; |
| 292 | force_sig_info(SIGBUS, &info, tsk); |
| 293 | return; |
| 294 | |
| 295 | vmalloc_fault: |
| 296 | { |
| 297 | /* |
| 298 | * Synchronize this task's top level page-table |
| 299 | * with the 'reference' page table. |
| 300 | * |
| 301 | * Do _not_ use "tsk" here. We might be inside |
| 302 | * an interrupt in the middle of a task switch.. |
| 303 | */ |
| 304 | int offset = pgd_index(address); |
| 305 | pgd_t *pgd, *pgd_k; |
| 306 | pmd_t *pmd, *pmd_k; |
| 307 | pte_t *pte_k; |
| 308 | |
| 309 | pgd = (pgd_t *)*(unsigned long *)MPTB; |
| 310 | pgd = offset + (pgd_t *)pgd; |
| 311 | pgd_k = init_mm.pgd + offset; |
| 312 | |
| 313 | if (!pgd_present(*pgd_k)) |
| 314 | goto no_context; |
| 315 | |
| 316 | /* |
| 317 | * set_pgd(pgd, *pgd_k); here would be useless on PAE |
| 318 | * and redundant with the set_pmd() on non-PAE. |
| 319 | */ |
| 320 | |
| 321 | pmd = pmd_offset(pgd, address); |
| 322 | pmd_k = pmd_offset(pgd_k, address); |
| 323 | if (!pmd_present(*pmd_k)) |
| 324 | goto no_context; |
| 325 | set_pmd(pmd, *pmd_k); |
| 326 | |
| 327 | pte_k = pte_offset_kernel(pmd_k, address); |
| 328 | if (!pte_present(*pte_k)) |
| 329 | goto no_context; |
| 330 | |
Hirokazu Takata | 9b87ed7 | 2007-02-10 01:43:37 -0800 | [diff] [blame] | 331 | addr = (address & PAGE_MASK); |
| 332 | set_thread_fault_code(error_code); |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 333 | update_mmu_cache(NULL, addr, pte_k); |
Hirokazu Takata | 9b87ed7 | 2007-02-10 01:43:37 -0800 | [diff] [blame] | 334 | set_thread_fault_code(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | return; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | /*======================================================================* |
| 340 | * update_mmu_cache() |
| 341 | *======================================================================*/ |
| 342 | #define TLB_MASK (NR_TLB_ENTRIES - 1) |
| 343 | #define ITLB_END (unsigned long *)(ITLB_BASE + (NR_TLB_ENTRIES * 8)) |
| 344 | #define DTLB_END (unsigned long *)(DTLB_BASE + (NR_TLB_ENTRIES * 8)) |
| 345 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr, |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 346 | pte_t *ptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | { |
Hirokazu Takata | 9b87ed7 | 2007-02-10 01:43:37 -0800 | [diff] [blame] | 348 | volatile unsigned long *entry1, *entry2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | unsigned long pte_data, flags; |
| 350 | unsigned int *entry_dat; |
| 351 | int inst = get_thread_fault_code() & ACE_INSTRUCTION; |
| 352 | int i; |
| 353 | |
| 354 | /* Ptrace may call this routine. */ |
| 355 | if (vma && current->active_mm != vma->vm_mm) |
| 356 | return; |
| 357 | |
| 358 | local_irq_save(flags); |
| 359 | |
| 360 | vaddr = (vaddr & PAGE_MASK) | get_asid(); |
| 361 | |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 362 | pte_data = pte_val(*ptep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Hirokazu Takata | 9b87ed7 | 2007-02-10 01:43:37 -0800 | [diff] [blame] | 364 | #ifdef CONFIG_CHIP_OPSP |
| 365 | entry1 = (unsigned long *)ITLB_BASE; |
| 366 | for (i = 0; i < NR_TLB_ENTRIES; i++) { |
| 367 | if (*entry1++ == vaddr) { |
| 368 | set_tlb_data(entry1, pte_data); |
| 369 | break; |
| 370 | } |
| 371 | entry1++; |
| 372 | } |
| 373 | entry2 = (unsigned long *)DTLB_BASE; |
| 374 | for (i = 0; i < NR_TLB_ENTRIES; i++) { |
| 375 | if (*entry2++ == vaddr) { |
| 376 | set_tlb_data(entry2, pte_data); |
| 377 | break; |
| 378 | } |
| 379 | entry2++; |
| 380 | } |
| 381 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | /* |
| 383 | * Update TLB entries |
| 384 | * entry1: ITLB entry address |
| 385 | * entry2: DTLB entry address |
| 386 | */ |
| 387 | __asm__ __volatile__ ( |
| 388 | "seth %0, #high(%4) \n\t" |
| 389 | "st %2, @(%5, %0) \n\t" |
| 390 | "ldi %1, #1 \n\t" |
| 391 | "st %1, @(%6, %0) \n\t" |
| 392 | "add3 r4, %0, %7 \n\t" |
| 393 | ".fillinsn \n" |
| 394 | "1: \n\t" |
| 395 | "ld %1, @(%6, %0) \n\t" |
| 396 | "bnez %1, 1b \n\t" |
| 397 | "ld %0, @r4+ \n\t" |
| 398 | "ld %1, @r4 \n\t" |
| 399 | "st %3, @+%0 \n\t" |
| 400 | "st %3, @+%1 \n\t" |
| 401 | : "=&r" (entry1), "=&r" (entry2) |
| 402 | : "r" (vaddr), "r" (pte_data), "i" (MMU_REG_BASE), |
| 403 | "i" (MSVA_offset), "i" (MTOP_offset), "i" (MIDXI_offset) |
| 404 | : "r4", "memory" |
| 405 | ); |
Hirokazu Takata | 9b87ed7 | 2007-02-10 01:43:37 -0800 | [diff] [blame] | 406 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | if ((!inst && entry2 >= DTLB_END) || (inst && entry1 >= ITLB_END)) |
| 409 | goto notfound; |
| 410 | |
| 411 | found: |
| 412 | local_irq_restore(flags); |
| 413 | |
| 414 | return; |
| 415 | |
| 416 | /* Valid entry not found */ |
| 417 | notfound: |
| 418 | /* |
| 419 | * Update ITLB or DTLB entry |
| 420 | * entry1: TLB entry address |
| 421 | * entry2: TLB base address |
| 422 | */ |
| 423 | if (!inst) { |
| 424 | entry2 = (unsigned long *)DTLB_BASE; |
| 425 | entry_dat = &tlb_entry_d; |
| 426 | } else { |
| 427 | entry2 = (unsigned long *)ITLB_BASE; |
| 428 | entry_dat = &tlb_entry_i; |
| 429 | } |
| 430 | entry1 = entry2 + (((*entry_dat - 1) & TLB_MASK) << 1); |
| 431 | |
| 432 | for (i = 0 ; i < NR_TLB_ENTRIES ; i++) { |
| 433 | if (!(entry1[1] & 2)) /* Valid bit check */ |
| 434 | break; |
| 435 | |
| 436 | if (entry1 != entry2) |
| 437 | entry1 -= 2; |
| 438 | else |
| 439 | entry1 += TLB_MASK << 1; |
| 440 | } |
| 441 | |
| 442 | if (i >= NR_TLB_ENTRIES) { /* Empty entry not found */ |
| 443 | entry1 = entry2 + (*entry_dat << 1); |
| 444 | *entry_dat = (*entry_dat + 1) & TLB_MASK; |
| 445 | } |
| 446 | *entry1++ = vaddr; /* Set TLB tag */ |
| 447 | set_tlb_data(entry1, pte_data); |
| 448 | |
| 449 | goto found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /*======================================================================* |
| 453 | * flush_tlb_page() : flushes one page |
| 454 | *======================================================================*/ |
| 455 | void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) |
| 456 | { |
| 457 | if (vma->vm_mm && mm_context(vma->vm_mm) != NO_CONTEXT) { |
| 458 | unsigned long flags; |
| 459 | |
| 460 | local_irq_save(flags); |
| 461 | page &= PAGE_MASK; |
| 462 | page |= (mm_context(vma->vm_mm) & MMU_CONTEXT_ASID_MASK); |
| 463 | __flush_tlb_page(page); |
| 464 | local_irq_restore(flags); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /*======================================================================* |
| 469 | * flush_tlb_range() : flushes a range of pages |
| 470 | *======================================================================*/ |
| 471 | void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, |
| 472 | unsigned long end) |
| 473 | { |
| 474 | struct mm_struct *mm; |
| 475 | |
| 476 | mm = vma->vm_mm; |
| 477 | if (mm_context(mm) != NO_CONTEXT) { |
| 478 | unsigned long flags; |
| 479 | int size; |
| 480 | |
| 481 | local_irq_save(flags); |
| 482 | size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
| 483 | if (size > (NR_TLB_ENTRIES / 4)) { /* Too many TLB to flush */ |
| 484 | mm_context(mm) = NO_CONTEXT; |
| 485 | if (mm == current->mm) |
| 486 | activate_context(mm); |
| 487 | } else { |
| 488 | unsigned long asid; |
| 489 | |
| 490 | asid = mm_context(mm) & MMU_CONTEXT_ASID_MASK; |
| 491 | start &= PAGE_MASK; |
| 492 | end += (PAGE_SIZE - 1); |
| 493 | end &= PAGE_MASK; |
| 494 | |
| 495 | start |= asid; |
| 496 | end |= asid; |
| 497 | while (start < end) { |
| 498 | __flush_tlb_page(start); |
| 499 | start += PAGE_SIZE; |
| 500 | } |
| 501 | } |
| 502 | local_irq_restore(flags); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /*======================================================================* |
| 507 | * flush_tlb_mm() : flushes the specified mm context TLB's |
| 508 | *======================================================================*/ |
| 509 | void local_flush_tlb_mm(struct mm_struct *mm) |
| 510 | { |
| 511 | /* Invalidate all TLB of this process. */ |
| 512 | /* Instead of invalidating each TLB, we get new MMU context. */ |
| 513 | if (mm_context(mm) != NO_CONTEXT) { |
| 514 | unsigned long flags; |
| 515 | |
| 516 | local_irq_save(flags); |
| 517 | mm_context(mm) = NO_CONTEXT; |
| 518 | if (mm == current->mm) |
| 519 | activate_context(mm); |
| 520 | local_irq_restore(flags); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /*======================================================================* |
| 525 | * flush_tlb_all() : flushes all processes TLBs |
| 526 | *======================================================================*/ |
| 527 | void local_flush_tlb_all(void) |
| 528 | { |
| 529 | unsigned long flags; |
| 530 | |
| 531 | local_irq_save(flags); |
| 532 | __flush_tlb_all(); |
| 533 | local_irq_restore(flags); |
| 534 | } |
| 535 | |
| 536 | /*======================================================================* |
| 537 | * init_mmu() |
| 538 | *======================================================================*/ |
| 539 | void __init init_mmu(void) |
| 540 | { |
| 541 | tlb_entry_i = 0; |
| 542 | tlb_entry_d = 0; |
| 543 | mmu_context_cache = MMU_CONTEXT_FIRST_VERSION; |
| 544 | set_asid(mmu_context_cache & MMU_CONTEXT_ASID_MASK); |
| 545 | *(volatile unsigned long *)MPTB = (unsigned long)swapper_pg_dir; |
| 546 | } |