arch/sh/include/asm/mmu_context_64.h

   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  */
  24 static inline void destroy_context(struct mm_struct *mm)
  25 {
  26         /* Well, at least free TLB entries */
  27         flush_tlb_mm(mm);
  28 }
  29
  30 static 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 */
  42 static 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 */
  70 extern unsigned long switch_and_save_asid(unsigned long new_asid);
  71
  72 /* No spare register to twiddle, so use a software cache */
  73 extern 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 */