Subversion Repositories HelenOS

Rev

Rev 3993 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * Copyright (c) 2008 Pavel Rimsky
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup sparc64interrupt
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  * @brief This file contains fast MMU trap handlers.
  36.  */
  37.  
  38. #ifndef KERN_sparc64_sun4v_MMU_TRAP_H_
  39. #define KERN_sparc64_sun4v_MMU_TRAP_H_
  40.  
  41. #include <arch/stack.h>
  42. #include <arch/regdef.h>
  43. #include <arch/arch.h>
  44. #include <arch/sun4v/hypercall.h>
  45. #include <arch/mm/tlb.h>
  46. #include <arch/mm/mmu.h>
  47. #include <arch/mm/tte.h>
  48. #include <arch/trap/regwin.h>
  49.  
  50. #ifdef CONFIG_TSB
  51. #include <arch/mm/tsb.h>
  52. #endif
  53.  
  54. #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64
  55. #define TT_FAST_DATA_ACCESS_MMU_MISS        0x68
  56. #define TT_FAST_DATA_ACCESS_PROTECTION      0x6c
  57. #define TT_CPU_MONDO                0x7c
  58.  
  59. #define FAST_MMU_HANDLER_SIZE           128
  60.  
  61. #ifdef __ASM__
  62.  
  63. /* MMU fault status area data fault offset */
  64. #define FSA_DFA_OFFSET              0x48
  65.  
  66. /* MMU fault status area data context */
  67. #define FSA_DFC_OFFSET              0x50
  68.  
  69. /* offset of the target address within the TTE Data entry */
  70. #define TTE_DATA_TADDR_OFFSET           13
  71.  
  72. .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
  73.     PREEMPTIBLE_HANDLER fast_instruction_access_mmu_miss
  74. .endm
  75.  
  76. /*
  77.  * Handler of the Fast Data Access MMU Miss trap. If the trap occurred in the kernel
  78.  * (context 0), an identity mapping (with displacement) is installed. Otherwise
  79.  * a higher level service routine is called.
  80.  */
  81. .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER tl
  82.  
  83.     mov SCRATCHPAD_MMU_FSA, %g1
  84.     ldxa [%g1] ASI_SCRATCHPAD, %g1          ! g1 <= RA of MMU fault status area
  85.  
  86.     /* read faulting context */
  87.     add %g1, FSA_DFC_OFFSET, %g2            ! g2 <= RA of data fault context
  88.     ldxa [%g2] ASI_REAL, %g3            ! read the fault context
  89.  
  90.     /* read the faulting address */
  91.     add %g1, FSA_DFA_OFFSET, %g2            ! g2 <= RA of data fault address
  92.     ldxa [%g2] ASI_REAL, %g1            ! read the fault address
  93.     srlx %g1, TTE_DATA_TADDR_OFFSET, %g1        ! truncate it to page boundary
  94.     sllx %g1, TTE_DATA_TADDR_OFFSET, %g1
  95.  
  96.     /* service by higher-level routine when context != 0 */
  97.     brnz %g3, 0f
  98.     nop
  99.  
  100.     /* exclude page number 0 from installing the identity mapping */
  101.     brz %g1, 0f
  102.     nop
  103.  
  104.     /*
  105.      * Installing the identity does not fit into 32 instructions, call
  106.      * a separate routine. The routine performs RETRY, hence the call never
  107.      * returns.
  108.      */
  109.     ba install_identity_mapping
  110.     nop
  111.  
  112.     0:
  113.  
  114.     /*
  115.      * One of the scenarios in which this trap can occur is when the
  116.      * register window spill/fill handler accesses a memory which is not
  117.      * mapped. In such a case, this handler will be called from TL = 1.
  118.      * We handle the situation by pretending that the MMU miss occurred
  119.      * on TL = 0. Once the MMU miss trap is services, the instruction which
  120.      * caused the spill/fill trap is restarted, the spill/fill trap occurs,
  121.      * but this time its handler accesse memory which IS mapped.
  122.      */
  123.     .if (\tl > 0)
  124.         wrpr %g0, 1, %tl
  125.     .endif
  126.  
  127.     /*
  128.      * Save the faulting virtual page and faulting context to the %g2
  129.      * register. The most significant 51 bits of the %g2 register will
  130.      * contain the virtual address which caused the fault truncated to the
  131.      * page boundary. The least significant 13 bits of the %g2 register
  132.      * will contain the number of the context in which the fault occurred.
  133.      * The value of the %g2 register will be passed as a parameter to the
  134.      * higher level service routine.
  135.      */
  136.     or %g1, %g3, %g2
  137.  
  138.     PREEMPTIBLE_HANDLER fast_data_access_mmu_miss
  139. .endm
  140.  
  141. /*
  142.  * Handler of the Fast Data MMU Protection trap. Finds the trapping address
  143.  * and context and calls higher level service routine.
  144.  */
  145. .macro FAST_DATA_ACCESS_PROTECTION_HANDLER tl
  146.     /*
  147.      * The same special case as in FAST_DATA_ACCESS_MMU_MISS_HANDLER.
  148.      */
  149.     .if (\tl > 0)
  150.         wrpr %g0, 1, %tl
  151.     .endif
  152.  
  153.     mov SCRATCHPAD_MMU_FSA, %g1
  154.     ldxa [%g1] ASI_SCRATCHPAD, %g1          ! g1 <= RA of MMU fault status area
  155.  
  156.     /* read faulting context */
  157.     add %g1, FSA_DFC_OFFSET, %g2            ! g2 <= RA of data fault context
  158.     ldxa [%g2] ASI_REAL, %g3            ! read the fault context
  159.  
  160.     /* read the faulting address */
  161.     add %g1, FSA_DFA_OFFSET, %g2            ! g2 <= RA of data fault address
  162.     ldxa [%g2] ASI_REAL, %g1            ! read the fault address
  163.     srlx %g1, TTE_DATA_TADDR_OFFSET, %g1        ! truncate it to page boundary
  164.     sllx %g1, TTE_DATA_TADDR_OFFSET, %g1
  165.  
  166.     /* the same as for FAST_DATA_ACCESS_MMU_MISS_HANDLER */
  167.     or %g1, %g3, %g2
  168.  
  169.     PREEMPTIBLE_HANDLER fast_data_access_protection
  170. .endm
  171.  
  172. #endif /* __ASM__ */
  173.  
  174. #endif
  175.  
  176. /** @}
  177.  */
  178.