lucu.h

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    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

Cache object: 944cbc1be584c883ebef7ff1fe5d6e1e

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FreeBSD/Linux Kernel Cross Reference sys/ppc/lucu.h

FreeBSD/Linux Kernel Cross Reference
sys/ppc/lucu.h