/* * include/asm-xtensa/tlbflush.h * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2005 Tensilica Inc. */ #ifndef _XTENSA_TLBFLUSH_H #define _XTENSA_TLBFLUSH_H #ifdef __KERNEL__ #include <linux/stringify.h> #include <asm/processor.h> #define DTLB_WAY_PGD 7 #define ITLB_ARF_WAYS 4 #define DTLB_ARF_WAYS 4 #define ITLB_HIT_BIT 3 #define DTLB_HIT_BIT 4 #ifndef __ASSEMBLY__ /* TLB flushing: * * - flush_tlb_all() flushes all processes TLB entries * - flush_tlb_mm(mm) flushes the specified mm context TLB entries * - flush_tlb_page(mm, vmaddr) flushes a single page * - flush_tlb_range(mm, start, end) flushes a range of pages */ extern void flush_tlb_all(void); extern void flush_tlb_mm(struct mm_struct*); extern void flush_tlb_page(struct vm_area_struct*,unsigned long); extern void flush_tlb_range(struct vm_area_struct*,unsigned long,unsigned long); #define flush_tlb_kernel_range(start,end) flush_tlb_all() /* This is calld in munmap when we have freed up some page-table pages. * We don't need to do anything here, there's nothing special about our * page-table pages. */ static inline void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end) { } /* TLB operations. */ static inline unsigned long itlb_probe(unsigned long addr) { unsigned long tmp; __asm__ __volatile__("pitlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); return tmp; } static inline unsigned long dtlb_probe(unsigned long addr) { unsigned long tmp; __asm__ __volatile__("pdtlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); return tmp; } static inline void invalidate_itlb_entry (unsigned long probe) { __asm__ __volatile__("iitlb %0; isync\n\t" : : "a" (probe)); } static inline void invalidate_dtlb_entry (unsigned long probe) { __asm__ __volatile__("idtlb %0; dsync\n\t" : : "a" (probe)); } /* Use the .._no_isync functions with caution. Generally, these are * handy for bulk invalidates followed by a single 'isync'. The * caller must follow up with an 'isync', which can be relatively * expensive on some Xtensa implementations. */ static inline void invalidate_itlb_entry_no_isync (unsigned entry) { /* Caller must follow up with 'isync'. */ __asm__ __volatile__ ("iitlb %0\n" : : "a" (entry) ); } static inline void invalidate_dtlb_entry_no_isync (unsigned entry) { /* Caller must follow up with 'isync'. */ __asm__ __volatile__ ("idtlb %0\n" : : "a" (entry) ); } static inline void set_itlbcfg_register (unsigned long val) { __asm__ __volatile__("wsr %0, "__stringify(ITLBCFG)"\n\t" "isync\n\t" : : "a" (val)); } static inline void set_dtlbcfg_register (unsigned long val) { __asm__ __volatile__("wsr %0, "__stringify(DTLBCFG)"; dsync\n\t" : : "a" (val)); } static inline void set_ptevaddr_register (unsigned long val) { __asm__ __volatile__(" wsr %0, "__stringify(PTEVADDR)"; isync\n" : : "a" (val)); } static inline unsigned long read_ptevaddr_register (void) { unsigned long tmp; __asm__ __volatile__("rsr %0, "__stringify(PTEVADDR)"\n\t" : "=a" (tmp)); return tmp; } static inline void write_dtlb_entry (pte_t entry, int way) { __asm__ __volatile__("wdtlb %1, %0; dsync\n\t" : : "r" (way), "r" (entry) ); } static inline void write_itlb_entry (pte_t entry, int way) { __asm__ __volatile__("witlb %1, %0; isync\n\t" : : "r" (way), "r" (entry) ); } static inline void invalidate_page_directory (void) { invalidate_dtlb_entry (DTLB_WAY_PGD); invalidate_dtlb_entry (DTLB_WAY_PGD+1); invalidate_dtlb_entry (DTLB_WAY_PGD+2); } static inline void invalidate_itlb_mapping (unsigned address) { unsigned long tlb_entry; if (((tlb_entry = itlb_probe(address)) & (1 << ITLB_HIT_BIT)) != 0) invalidate_itlb_entry(tlb_entry); } static inline void invalidate_dtlb_mapping (unsigned address) { unsigned long tlb_entry; if (((tlb_entry = dtlb_probe(address)) & (1 << DTLB_HIT_BIT)) != 0) invalidate_dtlb_entry(tlb_entry); } #define check_pgt_cache() do { } while (0) /* * DO NOT USE THESE FUNCTIONS. These instructions aren't part of the Xtensa * ISA and exist only for test purposes.. * You may find it helpful for MMU debugging, however. * * 'at' is the unmodified input register * 'as' is the output register, as follows (specific to the Linux config): * * as[31..12] contain the virtual address * as[11..08] are meaningless * as[07..00] contain the asid */ static inline unsigned long read_dtlb_virtual (int way) { unsigned long tmp; __asm__ __volatile__("rdtlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); return tmp; } static inline unsigned long read_dtlb_translation (int way) { unsigned long tmp; __asm__ __volatile__("rdtlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); return tmp; } static inline unsigned long read_itlb_virtual (int way) { unsigned long tmp; __asm__ __volatile__("ritlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); return tmp; } static inline unsigned long read_itlb_translation (int way) { unsigned long tmp; __asm__ __volatile__("ritlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); return tmp; } #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _XTENSA_TLBFLUSH_H */