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- /*
- * 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
-
- #define DEBUG_TLB
-
- #ifdef __KERNEL__
-
- #include <asm/processor.h>
- #include <linux/stringify.h>
-
- /* 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. */
-
- #define ITLB_WAYS_LOG2 XCHAL_ITLB_WAY_BITS
- #define DTLB_WAYS_LOG2 XCHAL_DTLB_WAY_BITS
- #define ITLB_PROBE_SUCCESS (1 << ITLB_WAYS_LOG2)
- #define DTLB_PROBE_SUCCESS (1 << DTLB_WAYS_LOG2)
-
- 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_PGTABLE);
- }
-
- static inline void invalidate_itlb_mapping (unsigned address)
- {
- unsigned long tlb_entry;
- while ((tlb_entry = itlb_probe (address)) & ITLB_PROBE_SUCCESS)
- invalidate_itlb_entry (tlb_entry);
- }
-
- static inline void invalidate_dtlb_mapping (unsigned address)
- {
- unsigned long tlb_entry;
- while ((tlb_entry = dtlb_probe (address)) & DTLB_PROBE_SUCCESS)
- invalidate_dtlb_entry (tlb_entry);
- }
-
- #define check_pgt_cache() do { } while (0)
-
-
- #ifdef DEBUG_TLB
-
- /* 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 /* DEBUG_TLB */
-
-
- #endif /* __KERNEL__ */
- #endif /* _XTENSA_PGALLOC_H */
-