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-rw-r--r--arch/x86/pci/irq.c377
1 files changed, 313 insertions, 64 deletions
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index 97b63e35e152..a498b847d740 100644
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -25,6 +25,8 @@
#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
#define PIRQ_VERSION 0x0100
+#define IRT_SIGNATURE (('$' << 0) + ('I' << 8) + ('R' << 16) + ('T' << 24))
+
static int broken_hp_bios_irq9;
static int acer_tm360_irqrouting;
@@ -68,30 +70,99 @@ void (*pcibios_disable_irq)(struct pci_dev *dev) = pirq_disable_irq;
* and perform checksum verification.
*/
-static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr)
+static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr,
+ u8 *limit)
{
struct irq_routing_table *rt;
int i;
u8 sum;
- rt = (struct irq_routing_table *) addr;
+ rt = (struct irq_routing_table *)addr;
if (rt->signature != PIRQ_SIGNATURE ||
rt->version != PIRQ_VERSION ||
rt->size % 16 ||
- rt->size < sizeof(struct irq_routing_table))
+ rt->size < sizeof(struct irq_routing_table) ||
+ (limit && rt->size > limit - addr))
return NULL;
sum = 0;
for (i = 0; i < rt->size; i++)
sum += addr[i];
if (!sum) {
- DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n",
- rt);
+ DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%lx\n",
+ __pa(rt));
return rt;
}
return NULL;
}
+/*
+ * Handle the $IRT PCI IRQ Routing Table format used by AMI for its BCP
+ * (BIOS Configuration Program) external tool meant for tweaking BIOS
+ * structures without the need to rebuild it from sources. The $IRT
+ * format has been invented by AMI before Microsoft has come up with its
+ * $PIR format and a $IRT table is therefore there in some systems that
+ * lack a $PIR table.
+ *
+ * It uses the same PCI BIOS 2.1 format for interrupt routing entries
+ * themselves but has a different simpler header prepended instead,
+ * occupying 8 bytes, where a `$IRT' signature is followed by one byte
+ * specifying the total number of interrupt routing entries allocated in
+ * the table, then one byte specifying the actual number of entries used
+ * (which the BCP tool can take advantage of when modifying the table),
+ * and finally a 16-bit word giving the IRQs devoted exclusively to PCI.
+ * Unlike with the $PIR table there is no alignment guarantee.
+ *
+ * Given the similarity of the two formats the $IRT one is trivial to
+ * convert to the $PIR one, which we do here, except that obviously we
+ * have no information as to the router device to use, but we can handle
+ * it by matching PCI device IDs actually seen on the bus against ones
+ * that our individual routers recognise.
+ *
+ * Reportedly there is another $IRT table format where a 16-bit word
+ * follows the header instead that points to interrupt routing entries
+ * in a $PIR table provided elsewhere. In that case this code will not
+ * be reached though as the $PIR table will have been chosen instead.
+ */
+static inline struct irq_routing_table *pirq_convert_irt_table(u8 *addr,
+ u8 *limit)
+{
+ struct irt_routing_table *ir;
+ struct irq_routing_table *rt;
+ u16 size;
+ u8 sum;
+ int i;
+
+ ir = (struct irt_routing_table *)addr;
+ if (ir->signature != IRT_SIGNATURE || !ir->used || ir->size < ir->used)
+ return NULL;
+
+ size = sizeof(*ir) + ir->used * sizeof(ir->slots[0]);
+ if (size > limit - addr)
+ return NULL;
+
+ DBG(KERN_DEBUG "PCI: $IRT Interrupt Routing Table found at 0x%lx\n",
+ __pa(ir));
+ size = sizeof(*rt) + ir->used * sizeof(rt->slots[0]);
+ rt = kzalloc(size, GFP_KERNEL);
+ if (!rt)
+ return NULL;
+
+ rt->signature = PIRQ_SIGNATURE;
+ rt->version = PIRQ_VERSION;
+ rt->size = size;
+ rt->exclusive_irqs = ir->exclusive_irqs;
+ for (i = 0; i < ir->used; i++)
+ rt->slots[i] = ir->slots[i];
+
+ addr = (u8 *)rt;
+ sum = 0;
+ for (i = 0; i < size; i++)
+ sum += addr[i];
+ rt->checksum = -sum;
+
+ return rt;
+}
/*
* Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
@@ -99,17 +170,29 @@ static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr)
static struct irq_routing_table * __init pirq_find_routing_table(void)
{
+ u8 * const bios_start = (u8 *)__va(0xf0000);
+ u8 * const bios_end = (u8 *)__va(0x100000);
u8 *addr;
struct irq_routing_table *rt;
if (pirq_table_addr) {
- rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
+ rt = pirq_check_routing_table((u8 *)__va(pirq_table_addr),
+ NULL);
if (rt)
return rt;
printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
}
- for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
- rt = pirq_check_routing_table(addr);
+ for (addr = bios_start;
+ addr < bios_end - sizeof(struct irq_routing_table);
+ addr += 16) {
+ rt = pirq_check_routing_table(addr, bios_end);
+ if (rt)
+ return rt;
+ }
+ for (addr = bios_start;
+ addr < bios_end - sizeof(struct irt_routing_table);
+ addr++) {
+ rt = pirq_convert_irt_table(addr, bios_end);
if (rt)
return rt;
}
@@ -135,7 +218,8 @@ static void __init pirq_peer_trick(void)
#ifdef DEBUG
{
int j;
- DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
+ DBG(KERN_DEBUG "%02x:%02x.%x slot=%02x",
+ e->bus, e->devfn / 8, e->devfn % 8, e->slot);
for (j = 0; j < 4; j++)
DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
DBG("\n");
@@ -253,6 +337,15 @@ static void write_pc_conf_nybble(u8 base, u8 index, u8 val)
pc_conf_set(reg, x);
}
+/*
+ * FinALi pirq rules are as follows:
+ *
+ * - bit 0 selects between INTx Routing Table Mapping Registers,
+ *
+ * - bit 3 selects the nibble within the INTx Routing Table Mapping Register,
+ *
+ * - bits 7:4 map to bits 3:0 of the PCI INTx Sensitivity Register.
+ */
static int pirq_finali_get(struct pci_dev *router, struct pci_dev *dev,
int pirq)
{
@@ -260,11 +353,13 @@ static int pirq_finali_get(struct pci_dev *router, struct pci_dev *dev,
0, 9, 3, 10, 4, 5, 7, 6, 0, 11, 0, 12, 0, 14, 0, 15
};
unsigned long flags;
+ u8 index;
u8 x;
+ index = (pirq & 1) << 1 | (pirq & 8) >> 3;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY);
- x = irqmap[read_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, pirq - 1)];
+ x = irqmap[read_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index)];
pc_conf_set(PC_CONF_FINALI_LOCK, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return x;
@@ -278,13 +373,15 @@ static int pirq_finali_set(struct pci_dev *router, struct pci_dev *dev,
};
u8 val = irqmap[irq];
unsigned long flags;
+ u8 index;
if (!val)
return 0;
+ index = (pirq & 1) << 1 | (pirq & 8) >> 3;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY);
- write_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, pirq - 1, val);
+ write_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index, val);
pc_conf_set(PC_CONF_FINALI_LOCK, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return 1;
@@ -293,7 +390,7 @@ static int pirq_finali_set(struct pci_dev *router, struct pci_dev *dev,
static int pirq_finali_lvl(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
- u8 mask = ~(1u << (pirq - 1));
+ u8 mask = ~((pirq & 0xf0u) >> 4);
unsigned long flags;
u8 trig;
@@ -579,6 +676,81 @@ static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
return 1;
}
+
+/*
+ * PIRQ routing for the SiS85C497 AT Bus Controller & Megacell (ATM)
+ * ISA bridge used with the SiS 85C496/497 486 Green PC VESA/ISA/PCI
+ * Chipset.
+ *
+ * There are four PCI INTx#-to-IRQ Link registers provided in the
+ * SiS85C497 part of the peculiar combined 85C496/497 configuration
+ * space decoded by the SiS85C496 PCI & CPU Memory Controller (PCM)
+ * host bridge, at 0xc0/0xc1/0xc2/0xc3 respectively for the PCI INT
+ * A/B/C/D lines. Bit 7 enables the respective link if set and bits
+ * 3:0 select the 8259A IRQ line as follows:
+ *
+ * 0000 : Reserved
+ * 0001 : Reserved
+ * 0010 : Reserved
+ * 0011 : IRQ3
+ * 0100 : IRQ4
+ * 0101 : IRQ5
+ * 0110 : IRQ6
+ * 0111 : IRQ7
+ * 1000 : Reserved
+ * 1001 : IRQ9
+ * 1010 : IRQ10
+ * 1011 : IRQ11
+ * 1100 : IRQ12
+ * 1101 : Reserved
+ * 1110 : IRQ14
+ * 1111 : IRQ15
+ *
+ * We avoid using a reserved value for disabled links, hence the
+ * choice of IRQ15 for that case.
+ *
+ * References:
+ *
+ * "486 Green PC VESA/ISA/PCI Chipset, SiS 85C496/497", Rev 3.0,
+ * Silicon Integrated Systems Corp., July 1995
+ */
+
+#define PCI_SIS497_INTA_TO_IRQ_LINK 0xc0u
+
+#define PIRQ_SIS497_IRQ_MASK 0x0fu
+#define PIRQ_SIS497_IRQ_ENABLE 0x80u
+
+static int pirq_sis497_get(struct pci_dev *router, struct pci_dev *dev,
+ int pirq)
+{
+ int reg;
+ u8 x;
+
+ reg = pirq;
+ if (reg >= 1 && reg <= 4)
+ reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1;
+
+ pci_read_config_byte(router, reg, &x);
+ return (x & PIRQ_SIS497_IRQ_ENABLE) ? (x & PIRQ_SIS497_IRQ_MASK) : 0;
+}
+
+static int pirq_sis497_set(struct pci_dev *router, struct pci_dev *dev,
+ int pirq, int irq)
+{
+ int reg;
+ u8 x;
+
+ reg = pirq;
+ if (reg >= 1 && reg <= 4)
+ reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1;
+
+ pci_read_config_byte(router, reg, &x);
+ x &= ~(PIRQ_SIS497_IRQ_MASK | PIRQ_SIS497_IRQ_ENABLE);
+ x |= irq ? (PIRQ_SIS497_IRQ_ENABLE | irq) : PIRQ_SIS497_IRQ_MASK;
+ pci_write_config_byte(router, reg, x);
+ return 1;
+}
+
/*
* PIRQ routing for SiS 85C503 router used in several SiS chipsets.
* We have to deal with the following issues here:
@@ -640,11 +812,12 @@ static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
* bit 6-4 are probably unused, not like 5595
*/
-#define PIRQ_SIS_IRQ_MASK 0x0f
-#define PIRQ_SIS_IRQ_DISABLE 0x80
-#define PIRQ_SIS_USB_ENABLE 0x40
+#define PIRQ_SIS503_IRQ_MASK 0x0f
+#define PIRQ_SIS503_IRQ_DISABLE 0x80
+#define PIRQ_SIS503_USB_ENABLE 0x40
-static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
+static int pirq_sis503_get(struct pci_dev *router, struct pci_dev *dev,
+ int pirq)
{
u8 x;
int reg;
@@ -653,10 +826,11 @@ static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
if (reg >= 0x01 && reg <= 0x04)
reg += 0x40;
pci_read_config_byte(router, reg, &x);
- return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
+ return (x & PIRQ_SIS503_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS503_IRQ_MASK);
}
-static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
+static int pirq_sis503_set(struct pci_dev *router, struct pci_dev *dev,
+ int pirq, int irq)
{
u8 x;
int reg;
@@ -665,8 +839,8 @@ static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i
if (reg >= 0x01 && reg <= 0x04)
reg += 0x40;
pci_read_config_byte(router, reg, &x);
- x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
- x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
+ x &= ~(PIRQ_SIS503_IRQ_MASK | PIRQ_SIS503_IRQ_DISABLE);
+ x |= irq ? irq : PIRQ_SIS503_IRQ_DISABLE;
pci_write_config_byte(router, reg, x);
return 1;
}
@@ -958,13 +1132,19 @@ static __init int serverworks_router_probe(struct irq_router *r,
static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
- if (device != PCI_DEVICE_ID_SI_503)
- return 0;
-
- r->name = "SIS";
- r->get = pirq_sis_get;
- r->set = pirq_sis_set;
- return 1;
+ switch (device) {
+ case PCI_DEVICE_ID_SI_496:
+ r->name = "SiS85C497";
+ r->get = pirq_sis497_get;
+ r->set = pirq_sis497_set;
+ return 1;
+ case PCI_DEVICE_ID_SI_503:
+ r->name = "SiS85C503";
+ r->get = pirq_sis503_get;
+ r->set = pirq_sis503_set;
+ return 1;
+ }
+ return 0;
}
static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
@@ -1084,10 +1264,32 @@ static struct pci_dev *pirq_router_dev;
* chipset" ?
*/
+static bool __init pirq_try_router(struct irq_router *r,
+ struct irq_routing_table *rt,
+ struct pci_dev *dev)
+{
+ struct irq_router_handler *h;
+
+ DBG(KERN_DEBUG "PCI: Trying IRQ router for [%04x:%04x]\n",
+ dev->vendor, dev->device);
+
+ for (h = pirq_routers; h->vendor; h++) {
+ /* First look for a router match */
+ if (rt->rtr_vendor == h->vendor &&
+ h->probe(r, dev, rt->rtr_device))
+ return true;
+ /* Fall back to a device match */
+ if (dev->vendor == h->vendor &&
+ h->probe(r, dev, dev->device))
+ return true;
+ }
+ return false;
+}
+
static void __init pirq_find_router(struct irq_router *r)
{
struct irq_routing_table *rt = pirq_table;
- struct irq_router_handler *h;
+ struct pci_dev *dev;
#ifdef CONFIG_PCI_BIOS
if (!rt->signature) {
@@ -1106,50 +1308,94 @@ static void __init pirq_find_router(struct irq_router *r)
DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n",
rt->rtr_vendor, rt->rtr_device);
- pirq_router_dev = pci_get_domain_bus_and_slot(0, rt->rtr_bus,
- rt->rtr_devfn);
- if (!pirq_router_dev) {
- DBG(KERN_DEBUG "PCI: Interrupt router not found at "
- "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
- return;
+ /* Use any vendor:device provided by the routing table or try all. */
+ if (rt->rtr_vendor) {
+ dev = pci_get_domain_bus_and_slot(0, rt->rtr_bus,
+ rt->rtr_devfn);
+ if (dev && pirq_try_router(r, rt, dev))
+ pirq_router_dev = dev;
+ } else {
+ dev = NULL;
+ for_each_pci_dev(dev) {
+ if (pirq_try_router(r, rt, dev)) {
+ pirq_router_dev = dev;
+ break;
+ }
+ }
}
- for (h = pirq_routers; h->vendor; h++) {
- /* First look for a router match */
- if (rt->rtr_vendor == h->vendor &&
- h->probe(r, pirq_router_dev, rt->rtr_device))
- break;
- /* Fall back to a device match */
- if (pirq_router_dev->vendor == h->vendor &&
- h->probe(r, pirq_router_dev, pirq_router_dev->device))
- break;
- }
- dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
- pirq_router.name,
- pirq_router_dev->vendor, pirq_router_dev->device);
+ if (pirq_router_dev)
+ dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
+ pirq_router.name,
+ pirq_router_dev->vendor, pirq_router_dev->device);
+ else
+ DBG(KERN_DEBUG "PCI: Interrupt router not found at "
+ "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
/* The device remains referenced for the kernel lifetime */
}
-static struct irq_info *pirq_get_info(struct pci_dev *dev)
+/*
+ * We're supposed to match on the PCI device only and not the function,
+ * but some BIOSes build their tables with the PCI function included
+ * for motherboard devices, so if a complete match is found, then give
+ * it precedence over a slot match.
+ */
+static struct irq_info *pirq_get_dev_info(struct pci_dev *dev)
{
struct irq_routing_table *rt = pirq_table;
int entries = (rt->size - sizeof(struct irq_routing_table)) /
sizeof(struct irq_info);
+ struct irq_info *slotinfo = NULL;
struct irq_info *info;
for (info = rt->slots; entries--; info++)
- if (info->bus == dev->bus->number &&
- PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
- return info;
- return NULL;
+ if (info->bus == dev->bus->number) {
+ if (info->devfn == dev->devfn)
+ return info;
+ if (!slotinfo &&
+ PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
+ slotinfo = info;
+ }
+ return slotinfo;
+}
+
+/*
+ * Buses behind bridges are typically not listed in the PIRQ routing table.
+ * Do the usual dance then and walk the tree of bridges up adjusting the
+ * pin number accordingly on the way until the originating root bus device
+ * has been reached and then use its routing information.
+ */
+static struct irq_info *pirq_get_info(struct pci_dev *dev, u8 *pin)
+{
+ struct pci_dev *temp_dev = dev;
+ struct irq_info *info;
+ u8 temp_pin = *pin;
+ u8 dpin = temp_pin;
+
+ info = pirq_get_dev_info(dev);
+ while (!info && temp_dev->bus->parent) {
+ struct pci_dev *bridge = temp_dev->bus->self;
+
+ temp_pin = pci_swizzle_interrupt_pin(temp_dev, temp_pin);
+ info = pirq_get_dev_info(bridge);
+ if (info)
+ dev_warn(&dev->dev,
+ "using bridge %s INT %c to get INT %c\n",
+ pci_name(bridge),
+ 'A' + temp_pin - 1, 'A' + dpin - 1);
+
+ temp_dev = bridge;
+ }
+ *pin = temp_pin;
+ return info;
}
static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
{
- u8 pin;
struct irq_info *info;
int i, pirq, newirq;
+ u8 dpin, pin;
int irq = 0;
u32 mask;
struct irq_router *r = &pirq_router;
@@ -1157,8 +1403,8 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
char *msg = NULL;
/* Find IRQ pin */
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
- if (!pin) {
+ pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &dpin);
+ if (!dpin) {
dev_dbg(&dev->dev, "no interrupt pin\n");
return 0;
}
@@ -1171,20 +1417,21 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
if (!pirq_table)
return 0;
- info = pirq_get_info(dev);
+ pin = dpin;
+ info = pirq_get_info(dev, &pin);
if (!info) {
dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n",
- 'A' + pin - 1);
+ 'A' + dpin - 1);
return 0;
}
pirq = info->irq[pin - 1].link;
mask = info->irq[pin - 1].bitmap;
if (!pirq) {
- dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + pin - 1);
+ dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + dpin - 1);
return 0;
}
dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x",
- 'A' + pin - 1, pirq, mask, pirq_table->exclusive_irqs);
+ 'A' + dpin - 1, pirq, mask, pirq_table->exclusive_irqs);
mask &= pcibios_irq_mask;
/* Work around broken HP Pavilion Notebooks which assign USB to
@@ -1226,7 +1473,7 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
newirq = i;
}
}
- dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + pin - 1, newirq);
+ dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + dpin - 1, newirq);
/* Check if it is hardcoded */
if ((pirq & 0xf0) == 0xf0) {
@@ -1260,15 +1507,17 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
return 0;
}
}
- dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n", msg, 'A' + pin - 1, irq);
+ dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n",
+ msg, 'A' + dpin - 1, irq);
/* Update IRQ for all devices with the same pirq value */
for_each_pci_dev(dev2) {
- pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
- if (!pin)
+ pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &dpin);
+ if (!dpin)
continue;
- info = pirq_get_info(dev2);
+ pin = dpin;
+ info = pirq_get_info(dev2, &pin);
if (!info)
continue;
if (info->irq[pin - 1].link == pirq) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 23:40:11 +0000