diff options
Diffstat (limited to 'arch/xtensa/include/asm/tlbflush.h')
| -rw-r--r-- | arch/xtensa/include/asm/tlbflush.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/tlbflush.h b/arch/xtensa/include/asm/tlbflush.h new file mode 100644 index 00000000000..46d240074f7 --- /dev/null +++ b/arch/xtensa/include/asm/tlbflush.h @@ -0,0 +1,191 @@ +/* + * 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() + +/* 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 */ |