arch/sparc/mm/srmmu_access.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Assembler variants of srmmu access functions.
   3  * Implemented in assembler to allow run-time patching.
   4  * LEON uses a different ASI for MMUREGS than SUN.
   5  *
   6  * The leon_1insn_patch infrastructure is used
   7  * for the run-time patching.
   8  */
   9
  10 #include <linux/linkage.h>
  11
  12 #include <asm/asmmacro.h>
  13 #include <asm/pgtsrmmu.h>
  14 #include <asm/asi.h>
  15
  16 /* unsigned int srmmu_get_mmureg(void) */
  17 ENTRY(srmmu_get_mmureg)
  18 LEON_PI(lda     [%g0] ASI_LEON_MMUREGS, %o0)
  19 SUN_PI_(lda     [%g0] ASI_M_MMUREGS, %o0)
  20         retl
  21          nop
  22 ENDPROC(srmmu_get_mmureg)
  23
  24 /* void srmmu_set_mmureg(unsigned long regval) */
  25 ENTRY(srmmu_set_mmureg)
  26 LEON_PI(sta     %o0, [%g0] ASI_LEON_MMUREGS)
  27 SUN_PI_(sta     %o0, [%g0] ASI_M_MMUREGS)
  28         retl
  29          nop
  30 ENDPROC(srmmu_set_mmureg)
  31
  32 /* void srmmu_set_ctable_ptr(unsigned long paddr) */
  33 ENTRY(srmmu_set_ctable_ptr)
  34         /* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */
  35         srl     %o0, 4, %g1
  36         and     %g1, SRMMU_CTX_PMASK, %g1
  37
  38         mov     SRMMU_CTXTBL_PTR, %g2
  39 LEON_PI(sta     %g1, [%g2] ASI_LEON_MMUREGS)
  40 SUN_PI_(sta     %g1, [%g2] ASI_M_MMUREGS)
  41         retl
  42          nop
  43 ENDPROC(srmmu_set_ctable_ptr)
  44
  45
  46 /* void srmmu_set_context(int context) */
  47 ENTRY(srmmu_set_context)
  48         mov     SRMMU_CTX_REG, %g1
  49 LEON_PI(sta     %o0, [%g1] ASI_LEON_MMUREGS)
  50 SUN_PI_(sta     %o0, [%g1] ASI_M_MMUREGS)
  51         retl
  52          nop
  53 ENDPROC(srmmu_set_context)
  54
  55
  56 /* int srmmu_get_context(void) */
  57 ENTRY(srmmu_get_context)
  58         mov     SRMMU_CTX_REG, %o0
  59 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  60 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  61         retl
  62          nop
  63 ENDPROC(srmmu_get_context)
  64
  65
  66 /* unsigned int srmmu_get_fstatus(void) */
  67 ENTRY(srmmu_get_fstatus)
  68         mov     SRMMU_FAULT_STATUS, %o0
  69 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  70 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  71         retl
  72          nop
  73 ENDPROC(srmmu_get_fstatus)
  74
  75
  76 /* unsigned int srmmu_get_faddr(void) */
  77 ENTRY(srmmu_get_faddr)
  78         mov     SRMMU_FAULT_ADDR, %o0
  79 LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)
  80 SUN_PI_(lda     [%o0] ASI_M_MMUREGS, %o0)
  81         retl
  82          nop
  83 ENDPROC(srmmu_get_faddr)