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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup sparc64interrupt
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief This file contains fast MMU trap handlers.
  35.  */
  36.  
  37. #ifndef __sparc64_MMU_TRAP_H__
  38. #define __sparc64_MMU_TRAP_H__
  39.  
  40. #include <arch/stack.h>
  41. #include <arch/regdef.h>
  42. #include <arch/mm/tlb.h>
  43. #include <arch/mm/mmu.h>
  44. #include <arch/mm/tte.h>
  45.  
  46. #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64
  47. #define TT_FAST_DATA_ACCESS_MMU_MISS        0x68
  48. #define TT_FAST_DATA_ACCESS_PROTECTION      0x6c
  49.  
  50. #define FAST_MMU_HANDLER_SIZE           128
  51.  
  52. #ifdef __ASM__
  53. .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
  54.     save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
  55.     call fast_instruction_access_mmu_miss
  56.     nop
  57.     restore
  58.     retry  
  59. .endm
  60.  
  61. .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER
  62.     /*
  63.      * First, try to refill TLB from TSB.
  64.      */
  65.     ! TODO
  66.  
  67.     /*
  68.      * Second, test if it is the portion of the kernel address space
  69.      * which is faulting. If that is the case, immediately create
  70.      * identity mapping for that page in DTLB. VPN 0 is excluded from
  71.      * this treatment.
  72.      *
  73.      * Note that branch-delay slots are used in order to save space.
  74.      */
  75. 0:
  76.     mov VA_DMMU_TAG_ACCESS, %g1
  77.     ldxa [%g1] ASI_DMMU, %g1            ! read the faulting Context and VPN
  78.     set TLB_TAG_ACCESS_CONTEXT_MASK, %g2
  79.     andcc %g1, %g2, %g3             ! get Context
  80.     bnz 0f                      ! Context is non-zero
  81.     andncc %g1, %g2, %g3                ! get page address into %g3
  82.     bz 0f                       ! page address is zero
  83.  
  84.     or %g3, (TTE_CP|TTE_P|TTE_W), %g2       ! 8K pages are the default (encoded as 0)
  85.         set 1, %g3
  86.         sllx %g3, TTE_V_SHIFT, %g3
  87.         or %g2, %g3, %g2
  88.     stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG        ! identity map the kernel page
  89.     retry
  90.  
  91.     /*
  92.      * Third, catch and handle special cases when the trap is caused by
  93.      * some register window trap handler.
  94.      */
  95. 0:
  96.     ! TODO
  97.  
  98. 0:
  99.     wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate
  100.     PREEMPTIBLE_HANDLER fast_data_access_mmu_miss
  101. .endm
  102.  
  103. .macro FAST_DATA_ACCESS_PROTECTION_HANDLER
  104.     save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
  105.     call fast_data_access_protection
  106.     nop
  107.     restore
  108.     retry
  109. .endm
  110. #endif /* __ASM__ */
  111.  
  112. #endif
  113.  
  114. /** @}
  115.  */
  116.