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qemu-e2k/hw/hppa/lasi.c
Helge Deller b899fe41ce hw/hppa/lasi: Don't abort on invalid IMR value 
NetBSD initializes the LASI IMR value with 0xffffffff to disable all LASI
interrupts. This triggered an assert() and stopped the emulation.  By replacing
the check with a warning in the guest log we now allow NetBSD to boot again.

Signed-off-by: Helge Deller <deller@gmx.de>
2020-08-26 23:04:00 +02:00

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/*
* HP-PARISC Lasi chipset emulation.
*
* (C) 2019 by Helge Deller <deller@gmx.de>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
* Documentation available at:
* https://parisc.wiki.kernel.org/images-parisc/7/79/Lasi_ers.pdf
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "cpu.h"
#include "trace.h"
#include "hw/hw.h"
#include "hw/irq.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "hppa_sys.h"
#include "hw/net/lasi_82596.h"
#include "hw/char/parallel.h"
#include "hw/char/serial.h"
#include "hw/input/lasips2.h"
#include "exec/address-spaces.h"
#include "migration/vmstate.h"
#define TYPE_LASI_CHIP "lasi-chip"
#define LASI_IRR 0x00 /* RO */
#define LASI_IMR 0x04
#define LASI_IPR 0x08
#define LASI_ICR 0x0c
#define LASI_IAR 0x10
#define LASI_PCR 0x0C000 /* LASI Power Control register */
#define LASI_ERRLOG 0x0C004 /* LASI Error Logging register */
#define LASI_VER 0x0C008 /* LASI Version Control register */
#define LASI_IORESET 0x0C00C /* LASI I/O Reset register */
#define LASI_AMR 0x0C010 /* LASI Arbitration Mask register */
#define LASI_IO_CONF 0x7FFFE /* LASI primary configuration register */
#define LASI_IO_CONF2 0x7FFFF /* LASI secondary configuration register */
#define LASI_BIT(x) (1ul << (x))
#define LASI_IRQ_BITS (LASI_BIT(5) | LASI_BIT(7) | LASI_BIT(8) | LASI_BIT(9) \
| LASI_BIT(13) | LASI_BIT(14) | LASI_BIT(16) | LASI_BIT(17) \
| LASI_BIT(18) | LASI_BIT(19) | LASI_BIT(20) | LASI_BIT(21) \
| LASI_BIT(26))
#define ICR_BUS_ERROR_BIT LASI_BIT(8) /* bit 8 in ICR */
#define ICR_TOC_BIT LASI_BIT(1) /* bit 1 in ICR */
#define LASI_CHIP(obj) \
OBJECT_CHECK(LasiState, (obj), TYPE_LASI_CHIP)
typedef struct LasiState {
PCIHostState parent_obj;
uint32_t irr;
uint32_t imr;
uint32_t ipr;
uint32_t icr;
uint32_t iar;
uint32_t errlog;
uint32_t amr;
uint32_t rtc;
time_t rtc_ref;
MemoryRegion this_mem;
} LasiState;
static bool lasi_chip_mem_valid(void *opaque, hwaddr addr,
unsigned size, bool is_write,
MemTxAttrs attrs)
{
bool ret = false;
switch (addr) {
case LASI_IRR:
case LASI_IMR:
case LASI_IPR:
case LASI_ICR:
case LASI_IAR:
case (LASI_LAN_HPA - LASI_HPA):
case (LASI_LPT_HPA - LASI_HPA):
case (LASI_UART_HPA - LASI_HPA):
case (LASI_RTC_HPA - LASI_HPA):
case LASI_PCR ... LASI_AMR:
ret = true;
}
trace_lasi_chip_mem_valid(addr, ret);
return ret;
}
static MemTxResult lasi_chip_read_with_attrs(void *opaque, hwaddr addr,
uint64_t *data, unsigned size,
MemTxAttrs attrs)
{
LasiState *s = opaque;
MemTxResult ret = MEMTX_OK;
uint32_t val;
switch (addr) {
case LASI_IRR:
val = s->irr;
break;
case LASI_IMR:
val = s->imr;
break;
case LASI_IPR:
val = s->ipr;
/* Any read to IPR clears the register. */
s->ipr = 0;
break;
case LASI_ICR:
val = s->icr & ICR_BUS_ERROR_BIT; /* bus_error */
break;
case LASI_IAR:
val = s->iar;
break;
case (LASI_LAN_HPA - LASI_HPA):
case (LASI_LPT_HPA - LASI_HPA):
case (LASI_UART_HPA - LASI_HPA):
val = 0;
break;
case (LASI_RTC_HPA - LASI_HPA):
val = time(NULL);
val += s->rtc_ref;
break;
case LASI_PCR:
case LASI_VER: /* only version 0 existed. */
case LASI_IORESET:
val = 0;
break;
case LASI_ERRLOG:
val = s->errlog;
break;
case LASI_AMR:
val = s->amr;
break;
default:
/* Controlled by lasi_chip_mem_valid above. */
g_assert_not_reached();
}
trace_lasi_chip_read(addr, val);
*data = val;
return ret;
}
static MemTxResult lasi_chip_write_with_attrs(void *opaque, hwaddr addr,
uint64_t val, unsigned size,
MemTxAttrs attrs)
{
LasiState *s = opaque;
trace_lasi_chip_write(addr, val);
switch (addr) {
case LASI_IRR:
/* read-only. */
break;
case LASI_IMR:
s->imr = val;
if (((val & LASI_IRQ_BITS) != val) && (val != 0xffffffff))
qemu_log_mask(LOG_GUEST_ERROR,
"LASI: tried to set invalid %lx IMR value.\n",
(unsigned long) val);
break;
case LASI_IPR:
/* Any write to IPR clears the register. */
s->ipr = 0;
break;
case LASI_ICR:
s->icr = val;
/* if (val & ICR_TOC_BIT) issue_toc(); */
break;
case LASI_IAR:
s->iar = val;
break;
case (LASI_LAN_HPA - LASI_HPA):
/* XXX: reset LAN card */
break;
case (LASI_LPT_HPA - LASI_HPA):
/* XXX: reset parallel port */
break;
case (LASI_UART_HPA - LASI_HPA):
/* XXX: reset serial port */
break;
case (LASI_RTC_HPA - LASI_HPA):
s->rtc_ref = val - time(NULL);
break;
case LASI_PCR:
if (val == 0x02) /* immediately power off */
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
break;
case LASI_ERRLOG:
s->errlog = val;
break;
case LASI_VER:
/* read-only. */
break;
case LASI_IORESET:
break; /* XXX: TODO: Reset various devices. */
case LASI_AMR:
s->amr = val;
break;
default:
/* Controlled by lasi_chip_mem_valid above. */
g_assert_not_reached();
}
return MEMTX_OK;
}
static const MemoryRegionOps lasi_chip_ops = {
.read_with_attrs = lasi_chip_read_with_attrs,
.write_with_attrs = lasi_chip_write_with_attrs,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
.accepts = lasi_chip_mem_valid,
},
.impl = {
.min_access_size = 1,
.max_access_size = 4,
},
};
static const VMStateDescription vmstate_lasi = {
.name = "Lasi",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(irr, LasiState),
VMSTATE_UINT32(imr, LasiState),
VMSTATE_UINT32(ipr, LasiState),
VMSTATE_UINT32(icr, LasiState),
VMSTATE_UINT32(iar, LasiState),
VMSTATE_UINT32(errlog, LasiState),
VMSTATE_UINT32(amr, LasiState),
VMSTATE_END_OF_LIST()
}
};
static void lasi_set_irq(void *opaque, int irq, int level)
{
LasiState *s = opaque;
uint32_t bit = 1u << irq;
if (level) {
s->ipr |= bit;
if (bit & s->imr) {
uint32_t iar = s->iar;
s->irr |= bit;
if ((s->icr & ICR_BUS_ERROR_BIT) == 0) {
stl_be_phys(&address_space_memory, iar & -32, iar & 31);
}
}
}
}
static int lasi_get_irq(unsigned long hpa)
{
switch (hpa) {
case LASI_HPA:
return 14;
case LASI_UART_HPA:
return 5;
case LASI_LPT_HPA:
return 7;
case LASI_LAN_HPA:
return 8;
case LASI_SCSI_HPA:
return 9;
case LASI_AUDIO_HPA:
return 13;
case LASI_PS2KBD_HPA:
case LASI_PS2MOU_HPA:
return 26;
default:
g_assert_not_reached();
}
}
DeviceState *lasi_init(MemoryRegion *address_space)
{
DeviceState *dev;
LasiState *s;
dev = qdev_new(TYPE_LASI_CHIP);
s = LASI_CHIP(dev);
s->iar = CPU_HPA + 3;
/* Lasi access from main memory. */
memory_region_init_io(&s->this_mem, OBJECT(s), &lasi_chip_ops,
s, "lasi", 0x100000);
memory_region_add_subregion(address_space, LASI_HPA, &s->this_mem);
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
/* LAN */
if (enable_lasi_lan()) {
qemu_irq lan_irq = qemu_allocate_irq(lasi_set_irq, s,
lasi_get_irq(LASI_LAN_HPA));
lasi_82596_init(address_space, LASI_LAN_HPA, lan_irq);
}
/* Parallel port */
qemu_irq lpt_irq = qemu_allocate_irq(lasi_set_irq, s,
lasi_get_irq(LASI_LPT_HPA));
parallel_mm_init(address_space, LASI_LPT_HPA + 0x800, 0,
lpt_irq, parallel_hds[0]);
/* Real time clock (RTC), it's only one 32-bit counter @9000 */
s->rtc = time(NULL);
s->rtc_ref = 0;
if (serial_hd(1)) {
/* Serial port */
qemu_irq serial_irq = qemu_allocate_irq(lasi_set_irq, s,
lasi_get_irq(LASI_UART_HPA));
serial_mm_init(address_space, LASI_UART_HPA + 0x800, 0,
serial_irq, 8000000 / 16,
serial_hd(0), DEVICE_NATIVE_ENDIAN);
}
/* PS/2 Keyboard/Mouse */
qemu_irq ps2kbd_irq = qemu_allocate_irq(lasi_set_irq, s,
lasi_get_irq(LASI_PS2KBD_HPA));
lasips2_init(address_space, LASI_PS2KBD_HPA, ps2kbd_irq);
return dev;
}
static void lasi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_lasi;
}
static const TypeInfo lasi_pcihost_info = {
.name = TYPE_LASI_CHIP,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(LasiState),
.class_init = lasi_class_init,
};
static void lasi_register_types(void)
{
type_register_static(&lasi_pcihost_info);
}
type_init(lasi_register_types)
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