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#ifndef KERN_sparc64_sun4v_MMU_TRAP_H_
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#ifndef KERN_sparc64_sun4v_MMU_TRAP_H_
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#define KERN_sparc64_sun4v_MMU_TRAP_H_
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#define KERN_sparc64_sun4v_MMU_TRAP_H_
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#include <arch/stack.h>
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#include <arch/stack.h>
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#include <arch/sun4v/regdef.h>
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#include <arch/sun4v/regdef.h>
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#include <arch/sun4v/arch.h>
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#include <arch/sun4v/hypercall.h>
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#include <arch/mm/sun4v/tlb.h>
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#include <arch/mm/sun4v/tlb.h>
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#include <arch/mm/sun4v/mmu.h>
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#include <arch/mm/sun4v/mmu.h>
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#include <arch/mm/sun4v/tte.h>
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#include <arch/mm/sun4v/tte.h>
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#include <arch/trap/regwin.h>
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#include <arch/trap/regwin.h>
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#define FAST_MMU_HANDLER_SIZE           128
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#define FAST_MMU_HANDLER_SIZE           128
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#ifdef __ASM__
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#ifdef __ASM__
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/* MMU fault status area data fault offset */
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#define FSA_DFA_OFFSET              0x48
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/* MMU fault status area data context */
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#define FSA_DFC_OFFSET              0x50
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/* offset of the target address within the TTE Data entry */
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#define TTE_DATA_TADDR_OFFSET           13
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.macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
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.macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
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.endm
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.endm
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/*
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/*
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 * So far it is here only to process the trap which occurs when the kernel
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 * Handler of the Fast Data Access MMU Miss trap. If the trap occurred in the kernel
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 * needs to access the bootinfo structure, which is placed in the bootloader
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 * (context 0), an identity mapping (with displacement) is installed. Otherwise
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 * memory (i.e. before address 0x400000).
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 * a higher level service routine is called.
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 *
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 * TODO implement calling the higher level service routine
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 */
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 */
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.macro FAST_DATA_ACCESS_MMU_MISS_HANDLER tl
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.macro FAST_DATA_ACCESS_MMU_MISS_HANDLER tl
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    save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
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    mov SCRATCHPAD_MMU_FSA, %g1
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    ldxa [%g1] ASI_SCRATCHPAD, %g1          ! g1 <= RA of MMU fault status area
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    /* service by higher-level routine when context != 0 */
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    add %g1, FSA_DFC_OFFSET, %g2            ! g2 <= RA of data fault context
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    ldxa [%g2] ASI_REAL, %g3            ! read the fault context
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    set 0x8000, %o0
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    brnz %g3, 0f
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    set 0x0, %o1
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    nop
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    /* read the faulting address */
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    add %g1, FSA_DFA_OFFSET, %g2            ! g2 <= RA of data fault address
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    ldxa [%g2] ASI_REAL, %g1            ! read the fault address
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    srlx %g1, TTE_DATA_TADDR_OFFSET, %g1        ! truncate it to page boundary
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    setx 0x80000000804087c3, %g1, %o2
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    sllx %g1, TTE_DATA_TADDR_OFFSET, %g1
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    /* exclude page number 0 from installing the identity mapping */
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    set 0x3, %o3
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    brz %g1, 0f
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    ta 0x83
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    nop
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    /* installing the identity does not fit into 32 instructions, call a separate routine */
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    restore %g0, 0, %g0
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    ba install_identity_mapping
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    retry
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    nop
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    0: ! TODO - call higher level service routine
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.endm
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.endm
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.macro FAST_DATA_ACCESS_PROTECTION_HANDLER tl
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.macro FAST_DATA_ACCESS_PROTECTION_HANDLER tl
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.endm
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.endm
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