Ignore:
Timestamp:
2006-08-21T13:36:34Z (18 years ago)
Author:
Jakub Jermar <jakub@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
a796127
Parents:
ee289cf0
Message:

sparc64 work.
Define the istate structure.
Move the identity-mapping handler to assembly.
Make the preemptible handler more general so that TL=1 MMU exceptions can make use of it.

Little bit of formatting and indentation.

File:
1 edited

Legend:

Unmodified
Added
Removed

  • kernel/arch/sparc64/include/trap/mmu.h

    ree289cf0 rf47fd19  
    3939
    4040#include <arch/stack.h>
     41#include <arch/mm/tlb.h>
     42#include <arch/mm/mmu.h>
     43#include <arch/mm/tte.h>
    4144
    4245#define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS     0x64
    … …  
    5659
    5760.macro FAST_DATA_ACCESS_MMU_MISS_HANDLER
    58         save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
    59         call fast_data_access_mmu_miss
    60         nop
    61         restore
     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
    6287        retry
     88
     890:
     90        save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp                                             
     91        PREEMPTIBLE_HANDLER fast_data_access_mmu_miss
    6392.endm
    6493
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