FreeBSD/Linux Kernel Cross Reference
sys/ppc/lucu.h
1 /*
2 * on return from this function we will be running in virtual mode.
3 * We set up the Block Address Translation (BAT) registers thus:
4 * 1) first 3 BATs are 256M blocks, starting from KZERO->0
5 * 2) remaining BAT maps last 256M directly
6 */
7 TEXT mmuinit0(SB), $0
8 /* reset all the tlbs */
9 MOVW $64, R3
10 MOVW R3, CTR
11 MOVW $0, R4
12
13 tlbloop:
14 TLBIE R4
15 SYNC
16 ADD $BIT(19), R4
17 BDNZ tlbloop
18 TLBSYNC
19
20 /* BATs 0 and 1 cover memory from 0x00000000 to 0x20000000 */
21
22 /* KZERO -> 0, IBAT2 and DBAT2, 256 MB */
23 MOVW $(KZERO|(0x7ff<<2)|2), R3
24 MOVW $(PTEVALID|PTEWRITE), R4 /* PTEVALID => Cache coherency on */
25 MOVW R3, SPR(DBATU(2))
26 MOVW R4, SPR(DBATL(2))
27 MOVW R3, SPR(IBATU(2))
28 MOVW R4, SPR(IBATL(2))
29
30 /* enable MMU */
31 MOVW LR, R3
32 OR $KZERO, R3
33 MOVW R3, SPR(SRR0) /* Stored PC for RFI instruction */
34 MOVW MSR, R4
35 OR $(MSR_IR|MSR_DR|MSR_RI|MSR_FP), R4
36 MOVW R4, SPR(SRR1)
37 RFI /* resume in kernel mode in caller */
38
39 RETURN
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