arch/sh/include/asm/mmu_context_64.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_MMU_CONTEXT_64_H
   3 #define __ASM_SH_MMU_CONTEXT_64_H
   4
   5 /*
   6  * sh64-specific mmu_context interface.
   7  *
   8  * Copyright (C) 2000, 2001  Paolo Alberelli
   9  * Copyright (C) 2003 - 2007  Paul Mundt
  10  */
  11 #include <cpu/registers.h>
  12 #include <asm/cacheflush.h>
  13
  14 #define SR_ASID_MASK            0xffffffffff00ffffULL
  15 #define SR_ASID_SHIFT           16
  16
  17 /*
  18  * Destroy context related info for an mm_struct that is about
  19  * to be put to rest.
  20  */
  21 static inline void destroy_context(struct mm_struct *mm)
  22 {
  23         /* Well, at least free TLB entries */
  24         flush_tlb_mm(mm);
  25 }
  26
  27 static inline unsigned long get_asid(void)
  28 {
  29         unsigned long long sr;
  30
  31         asm volatile ("getcon   " __SR ", %0\n\t"
  32                       : "=r" (sr));
  33
  34         sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK;
  35         return (unsigned long) sr;
  36 }
  37
  38 /* Set ASID into SR */
  39 static inline void set_asid(unsigned long asid)
  40 {
  41         unsigned long long sr, pc;
  42
  43         asm volatile ("getcon   " __SR ", %0" : "=r" (sr));
  44
  45         sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT);
  46
  47         /*
  48          * It is possible that this function may be inlined and so to avoid
  49          * the assembler reporting duplicate symbols we make use of the
  50          * gas trick of generating symbols using numerics and forward
  51          * reference.
  52          */
  53         asm volatile ("movi     1, %1\n\t"
  54                       "shlli    %1, 28, %1\n\t"
  55                       "or       %0, %1, %1\n\t"
  56                       "putcon   %1, " __SR "\n\t"
  57                       "putcon   %0, " __SSR "\n\t"
  58                       "movi     1f, %1\n\t"
  59                       "ori      %1, 1 , %1\n\t"
  60                       "putcon   %1, " __SPC "\n\t"
  61                       "rte\n"
  62                       "1:\n\t"
  63                       : "=r" (sr), "=r" (pc) : "0" (sr));
  64 }
  65
  66 /* arch/sh/kernel/cpu/sh5/entry.S */
  67 extern unsigned long switch_and_save_asid(unsigned long new_asid);
  68
  69 /* No spare register to twiddle, so use a software cache */
  70 extern pgd_t *mmu_pdtp_cache;
  71
  72 #define set_TTB(pgd)    (mmu_pdtp_cache = (pgd))
  73 #define get_TTB()       (mmu_pdtp_cache)
  74
  75 #endif /* __ASM_SH_MMU_CONTEXT_64_H */