64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "../port/error.h"
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#include "ureg.h"
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/*
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* GISB arbiter registers
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*/
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static u32int *regs = (u32int*)(VIRTIO2 + 0x400000);
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enum {
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ArbTimer = 0x008/4,
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ArbErrCapClear = 0x7e4/4,
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ArbErrCapAddrHi = 0x7e8/4,
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ArbErrCapAddr = 0x7ec/4,
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ArbErrCapStatus = 0x7f4/4,
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CapStatusTimeout = 1<<12,
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CapStatusAbort = 1<<11,
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CapStatusWrite = 1<<1,
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CapStatusValid = 1<<0,
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ArbErrCapMaster = 0x7f8/4,
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};
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static int
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arbinterrupt(Ureg *)
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{
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u32int status = regs[ArbErrCapStatus];
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u32int master;
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uvlong addr;
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if((status & CapStatusValid) == 0)
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return 0;
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master = regs[ArbErrCapMaster];
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addr = regs[ArbErrCapAddr];
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addr |= (uvlong)regs[ArbErrCapAddrHi]<<32;
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regs[ArbErrCapClear] = CapStatusValid;
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iprint("cpu%d: GISB arbiter error: %s%s %s bus addr %llux, master %.8ux\n",
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m->machno,
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(status & CapStatusTimeout) ? "timeout" : "",
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(status & CapStatusAbort) ? "abort" : "",
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(status & CapStatusWrite) ? "writing" : "reading",
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addr,
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master);
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return 1;
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}
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void
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gisblink(void)
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{
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extern int (*buserror)(Ureg*); // trap.c
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regs[ArbErrCapClear] = CapStatusValid;
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buserror = arbinterrupt;
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}
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