ref: 854a1ab54f9af970059b167f2052598737c4ce31
dir: /sys/src/9/ppc/lucu.h/
/* * on return from this function we will be running in virtual mode. * We set up the Block Address Translation (BAT) registers thus: * 1) first 3 BATs are 256M blocks, starting from KZERO->0 * 2) remaining BAT maps last 256M directly */ TEXT mmuinit0(SB), $0 /* reset all the tlbs */ MOVW $64, R3 MOVW R3, CTR MOVW $0, R4 tlbloop: TLBIE R4 SYNC ADD $BIT(19), R4 BDNZ tlbloop TLBSYNC /* BATs 0 and 1 cover memory from 0x00000000 to 0x20000000 */ /* KZERO -> 0, IBAT2 and DBAT2, 256 MB */ MOVW $(KZERO|(0x7ff<<2)|2), R3 MOVW $(PTEVALID|PTEWRITE), R4 /* PTEVALID => Cache coherency on */ MOVW R3, SPR(DBATU(2)) MOVW R4, SPR(DBATL(2)) MOVW R3, SPR(IBATU(2)) MOVW R4, SPR(IBATL(2)) /* enable MMU */ MOVW LR, R3 OR $KZERO, R3 MOVW R3, SPR(SRR0) /* Stored PC for RFI instruction */ MOVW MSR, R4 OR $(MSR_IR|MSR_DR|MSR_RI|MSR_FP), R4 MOVW R4, SPR(SRR1) RFI /* resume in kernel mode in caller */ RETURN