| Message ID | 1421055917-17701-1-git-send-email-pl@kamp.de |
|---|---|
| State | New |
| Headers | show |
On 12/01/2015 10:45, Peter Lieven wrote: > Some ancient Linux kernels read from registers 0x09 and 0x3c-3f during > boot. According to the spec these registers are for diag and debug > purposes only. If they are absend qemu aborts on read. > > Signed-off-by: Peter Lieven <pl@kamp.de> > --- > hw/scsi/lsi53c895a.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c > index ec92048..db7d4b8 100644 > --- a/hw/scsi/lsi53c895a.c > +++ b/hw/scsi/lsi53c895a.c > @@ -277,6 +277,7 @@ typedef struct { > uint32_t csbc; > uint32_t scratch[18]; /* SCRATCHA-SCRATCHR */ > uint8_t sbr; > + uint32_t adder; > > /* Script ram is stored as 32-bit words in host byteorder. */ > uint32_t script_ram[2048]; > @@ -1389,6 +1390,7 @@ again: > switch ((insn >> 27) & 7) { > case 0: /* Jump */ > DPRINTF("Jump to 0x%08x\n", addr); > + s->adder = addr; > s->dsp = addr; > break; > case 1: /* Call */ > @@ -1513,6 +1515,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset) > return 0x7f; > case 0x08: /* Revision ID */ > return 0x00; > + case 0x09: /* SOCL */ > + return s->socl; > case 0xa: /* SSID */ > return s->ssid; > case 0xb: /* SBCL */ > @@ -1577,6 +1581,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset) > return s->sbr; > case 0x3b: /* DCNTL */ > return s->dcntl; > + /* ADDER Output (Debug of relative jump address) */ > + CASE_GET_REG32(adder, 0x3c) > case 0x40: /* SIEN0 */ > return s->sien0; > case 0x41: /* SIEN1 */ > Thanks! Paolo
diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index ec92048..db7d4b8 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -277,6 +277,7 @@ typedef struct { uint32_t csbc; uint32_t scratch[18]; /* SCRATCHA-SCRATCHR */ uint8_t sbr; + uint32_t adder; /* Script ram is stored as 32-bit words in host byteorder. */ uint32_t script_ram[2048]; @@ -1389,6 +1390,7 @@ again: switch ((insn >> 27) & 7) { case 0: /* Jump */ DPRINTF("Jump to 0x%08x\n", addr); + s->adder = addr; s->dsp = addr; break; case 1: /* Call */ @@ -1513,6 +1515,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset) return 0x7f; case 0x08: /* Revision ID */ return 0x00; + case 0x09: /* SOCL */ + return s->socl; case 0xa: /* SSID */ return s->ssid; case 0xb: /* SBCL */ @@ -1577,6 +1581,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset) return s->sbr; case 0x3b: /* DCNTL */ return s->dcntl; + /* ADDER Output (Debug of relative jump address) */ + CASE_GET_REG32(adder, 0x3c) case 0x40: /* SIEN0 */ return s->sien0; case 0x41: /* SIEN1 */
Some ancient Linux kernels read from registers 0x09 and 0x3c-3f during boot. According to the spec these registers are for diag and debug purposes only. If they are absend qemu aborts on read. Signed-off-by: Peter Lieven <pl@kamp.de> --- hw/scsi/lsi53c895a.c | 6 ++++++ 1 file changed, 6 insertions(+)