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/*
* Low-Level PCI Support for PC -- Routing of Interrupts
*
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/io_apic.h>
#include <asm/hw_irq.h>
#include "pci.h"
#include <asm/xen-public/xen.h>
#include <asm/xen-public/physdev.h>
/*
* Never use: 0, 1, 2 (timer, keyboard, and cascade)
* Avoid using: 13, 14 and 15 (FP error and IDE).
* Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
*/
unsigned int pcibios_irq_mask = 0xfff8;
static int pirq_penalty[16] = {
1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
0, 0, 0, 0, 1000, 100000, 100000, 100000
};
int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
static int __init pcibios_irq_init(void)
{
int bus;
physdev_op_t op;
DBG("PCI: IRQ init\n");
if (pcibios_enable_irq || raw_pci_ops == NULL)
return 0;
op.cmd = PHYSDEVOP_PCI_PROBE_ROOT_BUSES;
if (HYPERVISOR_physdev_op(&op) != 0) {
printk(KERN_WARNING "PCI: System does not support PCI\n");
return 0;
}
printk(KERN_INFO "PCI: Probing PCI hardware\n");
for (bus = 0; bus < 256; bus++)
if (test_bit(bus, (unsigned long *)
&op.u.pci_probe_root_buses.busmask[0]))
(void)pcibios_scan_root(bus);
pcibios_enable_irq = pirq_enable_irq;
return 0;
}
subsys_initcall(pcibios_irq_init);
void pcibios_penalize_isa_irq(int irq)
{
/*
* If any ISAPnP device reports an IRQ in its list of possible
* IRQ's, we try to avoid assigning it to PCI devices.
*/
pirq_penalty[irq] += 100;
}
int pirq_enable_irq(struct pci_dev *dev)
{
int err;
u8 pin;
physdev_op_t op;
/* Inform Xen that we are going to use this device. */
op.cmd = PHYSDEVOP_PCI_INITIALISE_DEVICE;
op.u.pci_initialise_device.bus = dev->bus->number;
op.u.pci_initialise_device.dev = PCI_SLOT(dev->devfn);
op.u.pci_initialise_device.func = PCI_FUNC(dev->devfn);
if ( (err = HYPERVISOR_physdev_op(&op)) != 0 )
return err;
/* Now we can bind to the very final IRQ line. */
pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &pin);
dev->irq = pin;
/* Sanity-check that an interrupt-producing device is routed
* to an IRQ. */
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (pin != 0) {
if (dev->irq != 0)
printk(KERN_INFO "PCI: Obtained IRQ %d for device %s\n",
dev->irq, dev->slot_name);
else
printk(KERN_WARNING "PCI: No IRQ known for interrupt "
"pin %c of device %s.\n", 'A' + pin - 1,
dev->slot_name);
}
return 0;
}
int pci_vector_resources(int last, int nr_released)
{
int count = nr_released;
int next = last;
int offset = (last % 8);
while (next < FIRST_SYSTEM_VECTOR) {
next += 8;
#ifdef CONFIG_X86_64
if (next == IA32_SYSCALL_VECTOR)
continue;
#else
if (next == SYSCALL_VECTOR)
continue;
#endif
count++;
if (next >= FIRST_SYSTEM_VECTOR) {
if (offset%8) {
next = FIRST_DEVICE_VECTOR + offset;
offset++;
continue;
}
count--;
}
}
return count;
}
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