arch/sparc/mm/srmmu_access.S

   1 /* Assembler variants of srmmu access functions.
   2  * Implemented in assembler to allow run-time patching.
   3  * LEON uses a different ASI for MMUREGS than SUN.
   4  *
   5  * The leon_1insn_patch infrastructure is used
   6  * for the run-time patching.
   7  */
   8
   9 #include <linux/linkage.h>
  10
  11 #include <asm/asmmacro.h>
  12 #include <asm/pgtsrmmu.h>
  13 #include <asm/asi.h>
  14
  15 /* unsigned int srmmu_get_mmureg(void) */
  16 ENTRY(srmmu_get_mmureg)
  17 LEON_PI(lda     [%g0] ASI_LEON_MMUREGS, %o0)
  18 SUN_PI_(lda     [%g0] ASI_M_MMUREGS, %o0)
  19         retl
  20          nop
  21 ENDPROC(srmmu_get_mmureg)
  22
  23 /* void srmmu_set_mmureg(unsigned long regval) */
  24 ENTRY(srmmu_set_mmureg)
  25 LEON_PI(sta     %o0, [%g0] ASI_LEON_MMUREGS)
  26 SUN_PI_(sta     %o0, [%g0] ASI_M_MMUREGS)
  27         retl
  28          nop
  29 ENDPROC(srmmu_set_mmureg)
  30
  31 /* void srmmu_set_ctable_ptr(unsigned long paddr) */
  32 ENTRY(srmmu_set_ctable_ptr)
  33         /* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */
  34         srl     %o0, 4, %g1
  35         and     %g1, SRMMU_CTX_PMASK, %g1
  36
  37         mov     SRMMU_CTXTBL_PTR, %g2
  38 LEON_PI(sta     %g1, [%g2] ASI_LEON_MMUREGS)
  39 SUN_PI_(sta     %g1, [%g2] ASI_M_MMUREGS)
  40         retl
  41          nop
  42 ENDPROC(srmmu_set_ctable_ptr)
  43
  44
  45 /* void srmmu_set_context(int context) */
  46 ENTRY(srmmu_set_context)
  47         mov     SRMMU_CTX_REG, %g1
  48 LEON_PI(sta     %o0, [%g1] ASI_LEON_MMUREGS)
  49 SUN_PI_(sta     %o0, [%g1] ASI_M_MMUREGS)
  50         retl
  51          nop
  52 ENDPROC(srmmu_set_context)
  53
  54
  55 /* int srmmu_get_context(void) */
  56 ENTRY(srmmu_get_context)
  57         mov     SRMMU_CTX_REG, %o0
  58 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  59 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  60         retl
  61          nop
  62 ENDPROC(srmmu_get_context)
  63
  64
  65 /* unsigned int srmmu_get_fstatus(void) */
  66 ENTRY(srmmu_get_fstatus)
  67         mov     SRMMU_FAULT_STATUS, %o0
  68 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  69 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  70         retl
  71          nop
  72 ENDPROC(srmmu_get_fstatus)
  73
  74
  75 /* unsigned int srmmu_get_faddr(void) */
  76 ENTRY(srmmu_get_faddr)
  77         mov     SRMMU_FAULT_ADDR, %o0
  78 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  79 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  80         retl
  81          nop
  82 ENDPROC(srmmu_get_faddr)