diff options
Diffstat (limited to 'os/cerf405/tlb.s')
| -rw-r--r-- | os/cerf405/tlb.s | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/os/cerf405/tlb.s b/os/cerf405/tlb.s new file mode 100644 index 00000000..98abd3fd --- /dev/null +++ b/os/cerf405/tlb.s @@ -0,0 +1,30 @@ +#include "mem.h" +#define MB (1024*1024) + +/* + * TLB prototype entries, loaded once-for-all at startup, + * remaining unchanged thereafter. + * Limit the table size to ensure it fits in small TLBs. + */ +#define TLBE(hi, lo) WORD $(hi); WORD $(lo) + +TEXT tlbtab(SB), $-4 + + /* tlbhi tlblo */ + + /* DRAM, 32MB */ + TLBE(KZERO|PHYSDRAM|TLB16MB|TLBVALID, PHYSDRAM|TLBZONE(0)|TLBWR|TLBEX) + TLBE(KZERO|(PHYSDRAM+16*MB)|TLB16MB|TLBVALID, (PHYSDRAM+16*MB)|TLBZONE(0)|TLBWR|TLBEX) + + /* memory-mapped IO, 4K */ + TLBE(PHYSMMIO|TLB4K|TLBVALID, PHYSMMIO|TLBZONE(0)|TLBWR|TLBI|TLBG) + + /* NAND flash access (4K?) */ + TLBE(PHYSNAND|TLB4K|TLBVALID, PHYSNAND|TLBZONE(0)|TLBWR|TLBI|TLBG) + + /* NOR flash, 2MB */ + TLBE(PHYSFLASH|TLB1MB|TLBVALID, PHYSFLASH|TLBZONE(0)|TLBWR|TLBEX) + TLBE((PHYSFLASH+MB)|TLB1MB|TLBVALID, (PHYSFLASH+MB)|TLBZONE(0)|TLBWR|TLBEX) + +TEXT tlbtabe(SB), $-4 + RETURN |