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/*
* ioapic.c IOAPIC emulation logic
*
* Copyright (c) 2004-2005 Fabrice Bellard
*
* Split the ioapic logic from apic.c
* Xiantao Zhang <xiantao.zhang@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw.h"
#include "pc.h"
#include "qemu-timer.h"
#include "host-utils.h"
//#define DEBUG_IOAPIC
#define IOAPIC_NUM_PINS 0x18
#define IOAPIC_LVT_MASKED (1<<16)
#define IOAPIC_TRIGGER_EDGE 0
#define IOAPIC_TRIGGER_LEVEL 1
/*io{apic,sapic} delivery mode*/
#define IOAPIC_DM_FIXED 0x0
#define IOAPIC_DM_LOWEST_PRIORITY 0x1
#define IOAPIC_DM_PMI 0x2
#define IOAPIC_DM_NMI 0x4
#define IOAPIC_DM_INIT 0x5
#define IOAPIC_DM_SIPI 0x5
#define IOAPIC_DM_EXTINT 0x7
struct IOAPICState {
uint8_t id;
uint8_t ioregsel;
uint32_t irr;
uint64_t ioredtbl[IOAPIC_NUM_PINS];
};
static void ioapic_service(IOAPICState *s)
{
uint8_t i;
uint8_t trig_mode;
uint8_t vector;
uint8_t delivery_mode;
uint32_t mask;
uint64_t entry;
uint8_t dest;
uint8_t dest_mode;
uint8_t polarity;
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
mask = 1 << i;
if (s->irr & mask) {
entry = s->ioredtbl[i];
if (!(entry & IOAPIC_LVT_MASKED)) {
trig_mode = ((entry >> 15) & 1);
dest = entry >> 56;
dest_mode = (entry >> 11) & 1;
delivery_mode = (entry >> 8) & 7;
polarity = (entry >> 13) & 1;
if (trig_mode == IOAPIC_TRIGGER_EDGE)
s->irr &= ~mask;
if (delivery_mode == IOAPIC_DM_EXTINT)
vector = pic_read_irq(isa_pic);
else
vector = entry & 0xff;
apic_deliver_irq(dest, dest_mode, delivery_mode,
vector, polarity, trig_mode);
}
}
}
}
void ioapic_set_irq(void *opaque, int vector, int level)
{
IOAPICState *s = opaque;
/* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
* to GSI 2. GSI maps to ioapic 1-1. This is not
* the cleanest way of doing it but it should work. */
if (vector == 0)
vector = 2;
if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
uint32_t mask = 1 << vector;
uint64_t entry = s->ioredtbl[vector];
if ((entry >> 15) & 1) {
/* level triggered */
if (level) {
s->irr |= mask;
ioapic_service(s);
} else {
s->irr &= ~mask;
}
} else {
/* edge triggered */
if (level) {
s->irr |= mask;
ioapic_service(s);
}
}
}
}
static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr)
{
IOAPICState *s = opaque;
int index;
uint32_t val = 0;
addr &= 0xff;
if (addr == 0x00) {
val = s->ioregsel;
} else if (addr == 0x10) {
switch (s->ioregsel) {
case 0x00:
val = s->id << 24;
break;
case 0x01:
val = 0x11 | ((IOAPIC_NUM_PINS - 1) << 16); /* version 0x11 */
break;
case 0x02:
val = 0;
break;
default:
index = (s->ioregsel - 0x10) >> 1;
if (index >= 0 && index < IOAPIC_NUM_PINS) {
if (s->ioregsel & 1)
val = s->ioredtbl[index] >> 32;
else
val = s->ioredtbl[index] & 0xffffffff;
}
}
#ifdef DEBUG_IOAPIC
printf("I/O APIC read: %08x = %08x\n", s->ioregsel, val);
#endif
}
return val;
}
static void ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
IOAPICState *s = opaque;
int index;
addr &= 0xff;
if (addr == 0x00) {
s->ioregsel = val;
return;
} else if (addr == 0x10) {
#ifdef DEBUG_IOAPIC
printf("I/O APIC write: %08x = %08x\n", s->ioregsel, val);
#endif
switch (s->ioregsel) {
case 0x00:
s->id = (val >> 24) & 0xff;
return;
case 0x01:
case 0x02:
return;
default:
index = (s->ioregsel - 0x10) >> 1;
if (index >= 0 && index < IOAPIC_NUM_PINS) {
if (s->ioregsel & 1) {
s->ioredtbl[index] &= 0xffffffff;
s->ioredtbl[index] |= (uint64_t)val << 32;
} else {
s->ioredtbl[index] &= ~0xffffffffULL;
s->ioredtbl[index] |= val;
}
ioapic_service(s);
}
}
}
}
static const VMStateDescription vmstate_ioapic = {
.name = "ioapic",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
VMSTATE_UINT8(id, IOAPICState),
VMSTATE_UINT8(ioregsel, IOAPICState),
VMSTATE_UINT64_ARRAY(ioredtbl, IOAPICState, IOAPIC_NUM_PINS),
VMSTATE_END_OF_LIST()
}
};
static void ioapic_reset(void *opaque)
{
IOAPICState *s = opaque;
int i;
memset(s, 0, sizeof(*s));
for(i = 0; i < IOAPIC_NUM_PINS; i++)
s->ioredtbl[i] = 1 << 16; /* mask LVT */
}
static CPUReadMemoryFunc * const ioapic_mem_read[3] = {
ioapic_mem_readl,
ioapic_mem_readl,
ioapic_mem_readl,
};
static CPUWriteMemoryFunc * const ioapic_mem_write[3] = {
ioapic_mem_writel,
ioapic_mem_writel,
ioapic_mem_writel,
};
qemu_irq *ioapic_init(void)
{
IOAPICState *s;
qemu_irq *irq;
int io_memory;
s = qemu_mallocz(sizeof(IOAPICState));
ioapic_reset(s);
io_memory = cpu_register_io_memory(ioapic_mem_read,
ioapic_mem_write, s);
cpu_register_physical_memory(0xfec00000, 0x1000, io_memory);
vmstate_register(0, &vmstate_ioapic, s);
qemu_register_reset(ioapic_reset, s);
irq = qemu_allocate_irqs(ioapic_set_irq, s, IOAPIC_NUM_PINS);
return irq;
}
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