| 38,6 → 38,9 |
|---|
| #define __sparc64_MMU_TRAP_H__ |
| |
| #include <arch/stack.h> |
| #include <arch/mm/tlb.h> |
| #include <arch/mm/mmu.h> |
| #include <arch/mm/tte.h> |
| |
| #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
| #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
| 55,11 → 58,37 |
|---|
| .endm |
| |
| .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
| save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
| call fast_data_access_mmu_miss |
| nop |
| restore |
| /* |
| * First, test if it is the portion of the kernel address space |
| * which is faulting. If that is the case, immediately create |
| * identity mapping for that page in DTLB. VPN 0 is excluded from |
| * this treatment. |
| * |
| * Note that branch-delay slots are used in order to save space. |
| */ |
| mov VA_DMMU_TAG_ACCESS, %g1 |
| ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
| set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
| andcc %g1, %g2, %g3 ! get Context |
| bnz 0f ! Context is non-zero |
| andncc %g1, %g2, %g3 ! get page address into %g3 |
| bz 0f ! page address is zero |
| |
| /* |
| * Create and insert the identity-mapped entry for |
| * the faulting kernel page. |
| */ |
| |
| or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
| set 1, %g3 |
| sllx %g3, TTE_V_SHIFT, %g3 |
| or %g2, %g3, %g2 |
| stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
| retry |
| |
| 0: |
| save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp |
| PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
| .endm |
| |
| .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |