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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/mm/tlb.h>
  42. #include <arch/mm/mmu.h>
  43. #include <arch/mm/tte.h>
  44.  
  45. #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64
  46. #define TT_FAST_DATA_ACCESS_MMU_MISS        0x68
  47. #define TT_FAST_DATA_ACCESS_PROTECTION      0x6c
  48.  
  49. #define FAST_MMU_HANDLER_SIZE           128
  50.  
  51. #ifdef __ASM__
  52. .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
  53.     save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
  54.     call fast_instruction_access_mmu_miss
  55.     nop
  56.     restore
  57.     retry  
  58. .endm
  59.  
  60. .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER
  61.     /*
  62.      * First, test if it is the portion of the kernel address space
  63.      * which is faulting. If that is the case, immediately create
  64.      * identity mapping for that page in DTLB. VPN 0 is excluded from
  65.      * this treatment.
  66.      *
  67.      * Note that branch-delay slots are used in order to save space.
  68.      */
  69.     mov VA_DMMU_TAG_ACCESS, %g1
  70.     ldxa [%g1] ASI_DMMU, %g1            ! read the faulting Context and VPN
  71.     set TLB_TAG_ACCESS_CONTEXT_MASK, %g2
  72.     andcc %g1, %g2, %g3             ! get Context
  73.     bnz 0f                      ! Context is non-zero
  74.     andncc %g1, %g2, %g3                ! get page address into %g3
  75.     bz 0f                       ! page address is zero
  76.  
  77.     /*
  78.      * Create and insert the identity-mapped entry for
  79.      * the faulting kernel page.
  80.      */
  81.    
  82.     or %g3, (TTE_CP|TTE_P|TTE_W), %g2       ! 8K pages are the default (encoded as 0)
  83.         set 1, %g3
  84.         sllx %g3, TTE_V_SHIFT, %g3
  85.         or %g2, %g3, %g2
  86.     stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG        ! identity map the kernel page
  87.     retry
  88.  
  89. 0:
  90.     save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp                         
  91.     PREEMPTIBLE_HANDLER fast_data_access_mmu_miss
  92. .endm
  93.  
  94. .macro FAST_DATA_ACCESS_PROTECTION_HANDLER
  95.     save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
  96.     call fast_data_access_protection
  97.     nop
  98.     restore
  99.     retry
  100. .endm
  101. #endif /* __ASM__ */
  102.  
  103. #endif
  104.  
  105. /** @}
  106.  */
  107.