* [Qemu-devel] [PATCH] hw/scsi/lsi53c895a: add support for additional diag / debug registers
@ 2015-01-12 9:45 Peter Lieven
2015-01-12 10:21 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Peter Lieven @ 2015-01-12 9:45 UTC (permalink / raw)
To: qemu-devel; +Cc: pbonzini, Peter Lieven
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 */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH] hw/scsi/lsi53c895a: add support for additional diag / debug registers
2015-01-12 9:45 [Qemu-devel] [PATCH] hw/scsi/lsi53c895a: add support for additional diag / debug registers Peter Lieven
@ 2015-01-12 10:21 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2015-01-12 10:21 UTC (permalink / raw)
To: Peter Lieven, qemu-devel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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