LXR linux/arch/sh/include/asm/mmu_context

   1#ifndef __ASM_SH_MMU_CONTEXT_64_H
   2#define __ASM_SH_MMU_CONTEXT_64_H
   3
   4/*
   5 * sh64-specific mmu_context interface.
   6 *
   7 * Copyright (C) 2000, 2001  Paolo Alberelli
   8 * Copyright (C) 2003 - 2007  Paul Mundt
   9 *
  10 * This file is subject to the terms and conditions of the GNU General Public
  11 * License.  See the file "COPYING" in the main directory of this archive
  12 * for more details.
  13 */
  14#include <cpu/registers.h>
  15#include <asm/cacheflush.h>
  16
  17#define SR_ASID_MASK            0xffffffffff00ffffULL
  18#define SR_ASID_SHIFT           16
  19
  20/*
  21 * Destroy context related info for an mm_struct that is about
  22 * to be put to rest.
  23 */
  24static inline void destroy_context(struct mm_struct *mm)
  25{
  26        /* Well, at least free TLB entries */
  27        flush_tlb_mm(mm);
  28}
  29
  30static inline unsigned long get_asid(void)
  31{
  32        unsigned long long sr;
  33
  34        asm volatile ("getcon   " __SR ", %0\n\t"
  35                      : "=r" (sr));
  36
  37        sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK;
  38        return (unsigned long) sr;
  39}
  40
  41/* Set ASID into SR */
  42static inline void set_asid(unsigned long asid)
  43{
  44        unsigned long long sr, pc;
  45
  46        asm volatile ("getcon   " __SR ", %0" : "=r" (sr));
  47
  48        sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT);
  49
  50        /*
  51         * It is possible that this function may be inlined and so to avoid
  52         * the assembler reporting duplicate symbols we make use of the
  53         * gas trick of generating symbols using numerics and forward
  54         * reference.
  55         */
  56        asm volatile ("movi     1, %1\n\t"
  57                      "shlli    %1, 28, %1\n\t"
  58                      "or       %0, %1, %1\n\t"
  59                      "putcon   %1, " __SR "\n\t"
  60                      "putcon   %0, " __SSR "\n\t"
  61                      "movi     1f, %1\n\t"
  62                      "ori      %1, 1 , %1\n\t"
  63                      "putcon   %1, " __SPC "\n\t"
  64                      "rte\n"
  65                      "1:\n\t"
  66                      : "=r" (sr), "=r" (pc) : "0" (sr));
  67}
  68
  69/* arch/sh/kernel/cpu/sh5/entry.S */
  70extern unsigned long switch_and_save_asid(unsigned long new_asid);
  71
  72/* No spare register to twiddle, so use a software cache */
  73extern pgd_t *mmu_pdtp_cache;
  74
  75#define set_TTB(pgd)    (mmu_pdtp_cache = (pgd))
  76#define get_TTB()       (mmu_pdtp_cache)
  77
  78#endif /* __ASM_SH_MMU_CONTEXT_64_H */
  79