diff options
Diffstat (limited to 'os/fads/tlb.s')
| -rw-r--r-- | os/fads/tlb.s | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/os/fads/tlb.s b/os/fads/tlb.s new file mode 100644 index 00000000..68ebf4e7 --- /dev/null +++ b/os/fads/tlb.s @@ -0,0 +1,23 @@ +#include "mem.h" + +#define MB (1024*1024) + +/* + * TLB prototype entries, loaded once-for-all at startup, + * remaining unchanged thereafter. + * Limit the table to at most 8 entries to ensure + * it works on the 823 (other 8xx processors allow up to 32 TLB entries). + */ +#define TLBE(epn,rpn,twc) WORD $(epn); WORD $(twc); WORD $(rpn) + +TEXT tlbtab(SB), $-4 + + /* epn, rpn, twc */ + TLBE(KZERO|PHYSDRAM|TLBVALID, PHYSDRAM|PTEWRITE|PTELPS|PTESH|PTEVALID, PTE8MB|/*PTEWT|*/PTEVALID) /* DRAM, 8M */ + TLBE(KZERO|PHYSBCSR|TLBVALID, PHYSBCSR|PTEWRITE|PTESH|PTECI|PTEVALID, PTE4K|PTEWT|PTEVALID) /* Board CSR, 4K */ + TLBE(KZERO|PHYSIMM|TLBVALID, PHYSIMM|PTEWRITE|PTELPS|PTESH|PTECI|PTEVALID, PTE4K|PTEWT|PTEVALID) /* IMMR, 16K */ + TLBE(KZERO|PHYSFLASH|TLBVALID, PHYSFLASH|PTEWRITE|PTELPS|PTESH|PTECI|PTEVALID, PTE8MB|PTEWT|PTEVALID) /* Flash, 8M */ + TLBE(KZERO|PHYSSDRAM|TLBVALID, PHYSSDRAM|PTEWRITE|PTELPS|PTESH|PTEVALID, PTE8MB|/*PTEWT|*/PTEVALID) /* SDRAM, 8M */ + TLBE(KZERO|PHYSPCMCIA|TLBVALID, PHYSPCMCIA|PTEWRITE|PTELPS|PTESH|PTECI|PTEVALID, PTE8MB|PTEWT|PTEG|PTEVALID) /* PCMCIA, 8M */ +TEXT tlbtabe(SB), $-4 + RETURN |