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lsi: implement basic SBCL functionality 

HP-UX checks this register after sending data to the target. If there's no valid
information present, it assumes the client disconnected because the kernel sent
to much data. Implement at least some of the SBCL functionality that is possible
without having a real SCSI bus.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Message-Id: <20190215194021.20543-1-svens@stackframe.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sven Schnelle 2019-02-15 20:40:21 +01:00 committed by Paolo Bonzini
parent d804232dc4
commit 12dd89f700
1 changed files with 27 additions and 4 deletions
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31
hw/scsi/lsi53c895a.c
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@ -160,6 +160,11 @@ static const char *names[] = {
#define LSI_CCNTL1_DDAC 0x08
#define LSI_CCNTL1_ZMOD 0x80
#define LSI_SBCL_ATN 0x08
#define LSI_SBCL_BSY 0x20
#define LSI_SBCL_ACK 0x40
#define LSI_SBCL_REQ 0x80
/* Enable Response to Reselection */
#define LSI_SCID_RRE 0x60
@ -258,6 +263,7 @@ typedef struct {
uint8_t sdid;
uint8_t ssid;
uint8_t sfbr;
uint8_t sbcl;
uint8_t stest1;
uint8_t stest2;
uint8_t stest3;
@ -356,6 +362,7 @@ static void lsi_soft_reset(LSIState *s)
s->socl = 0;
s->sdid = 0;
s->ssid = 0;
s->sbcl = 0;
s->stest1 = 0;
s->stest2 = 0;
s->stest3 = 0;
@ -530,6 +537,8 @@ static void lsi_script_dma_interrupt(LSIState *s, int stat)
static inline void lsi_set_phase(LSIState *s, int phase)
{
s->sbcl &= ~PHASE_MASK;
s->sbcl |= phase | LSI_SBCL_REQ;
s->sstat1 = (s->sstat1 & ~PHASE_MASK) | phase;
}
@ -567,6 +576,7 @@ static void lsi_disconnect(LSIState *s)
{
s->scntl1 &= ~LSI_SCNTL1_CON;
s->sstat1 &= ~PHASE_MASK;
s->sbcl = 0;
}
static void lsi_bad_selection(LSIState *s, uint32_t id)
@ -1265,7 +1275,9 @@ again:
s->scntl1 |= LSI_SCNTL1_CON;
if (insn & (1 << 3)) {
s->socl |= LSI_SOCL_ATN;
s->sbcl |= LSI_SBCL_ATN;
}
s->sbcl |= LSI_SBCL_BSY;
lsi_set_phase(s, PHASE_MO);
break;
case 1: /* Disconnect */
@ -1297,8 +1309,14 @@ again:
insn & (1 << 10) ? " CC" : "");
if (insn & (1 << 3)) {
s->socl |= LSI_SOCL_ATN;
s->sbcl |= LSI_SBCL_ATN;
lsi_set_phase(s, PHASE_MO);
}
if (insn & (1 << 6)) {
s->sbcl |= LSI_SBCL_ACK;
}
if (insn & (1 << 9)) {
qemu_log_mask(LOG_UNIMP,
"lsi_scsi: Target mode not implemented\n");
@ -1314,7 +1332,13 @@ again:
insn & (1 << 10) ? " CC" : "");
if (insn & (1 << 3)) {
s->socl &= ~LSI_SOCL_ATN;
s->sbcl &= ~LSI_SBCL_ATN;
}
if (insn & (1 << 6)) {
s->sbcl &= ~LSI_SBCL_ACK;
}
if (insn & (1 << 10))
s->carry = 0;
break;
@ -1591,9 +1615,7 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
ret = s->ssid;
break;
case 0xb: /* SBCL */
/* ??? This is not correct. However it's (hopefully) only
used for diagnostics, so should be ok. */
ret = 0;
ret = s->sbcl;
break;
case 0xc: /* DSTAT */
ret = s->dstat | LSI_DSTAT_DFE;
@ -2143,7 +2165,7 @@ static int lsi_post_load(void *opaque, int version_id)
static const VMStateDescription vmstate_lsi_scsi = {
.name = "lsiscsi",
.version_id = 0,
.version_id = 1,
.minimum_version_id = 0,
.pre_save = lsi_pre_save,
.post_load = lsi_post_load,
@ -2202,6 +2224,7 @@ static const VMStateDescription vmstate_lsi_scsi = {
VMSTATE_UINT8(stime0, LSIState),
VMSTATE_UINT8(respid0, LSIState),
VMSTATE_UINT8(respid1, LSIState),
VMSTATE_UINT8_V(sbcl, LSIState, 1),
VMSTATE_UINT32(mmrs, LSIState),
VMSTATE_UINT32(mmws, LSIState),
VMSTATE_UINT32(sfs, LSIState),