mirror of
https://github.com/torvalds/linux
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120bb4246a
I updated this to remove unnecessary variable initialization, make check_routing be inline only and not __init, switch to strtoul, and formatting fixes as per Randy Dunlap's recommendations. I updated this to change pirq_table_addr to a long, and to add a warning msg if the PIRQ table wasn't found at the specified address, as per thread with Matthew Wilcox. In our hardware situation, the BIOS is unable to store or generate it's PIRQ table in the F0000h-100000h standard range. This patch adds a pci kernel parameter, pirqaddr to allow the bootloader (or BIOS based loader) to inform the kernel where the PIRQ table got stored. A beneficial side-effect is that, if one's BIOS uses a static address each time for it's PIRQ table, then pirqaddr can be used to avoid the $pirq search through that address block each time at boot for normal PIRQ BIOSes. Signed-off-by: Jaya Kumar <jayalk@intworks.biz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/*
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* Low-Level PCI Access for i386 machines.
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*
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* (c) 1999 Martin Mares <mj@ucw.cz>
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*/
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(x...) printk(x)
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#else
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#define DBG(x...)
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#endif
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#define PCI_PROBE_BIOS 0x0001
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#define PCI_PROBE_CONF1 0x0002
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#define PCI_PROBE_CONF2 0x0004
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#define PCI_PROBE_MMCONF 0x0008
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#define PCI_PROBE_MASK 0x000f
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#define PCI_NO_SORT 0x0100
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#define PCI_BIOS_SORT 0x0200
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#define PCI_NO_CHECKS 0x0400
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#define PCI_USE_PIRQ_MASK 0x0800
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#define PCI_ASSIGN_ROMS 0x1000
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#define PCI_BIOS_IRQ_SCAN 0x2000
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#define PCI_ASSIGN_ALL_BUSSES 0x4000
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extern unsigned int pci_probe;
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extern unsigned long pirq_table_addr;
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/* pci-i386.c */
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extern unsigned int pcibios_max_latency;
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void pcibios_resource_survey(void);
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int pcibios_enable_resources(struct pci_dev *, int);
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/* pci-pc.c */
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extern int pcibios_last_bus;
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extern struct pci_bus *pci_root_bus;
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extern struct pci_ops pci_root_ops;
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/* pci-irq.c */
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struct irq_info {
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u8 bus, devfn; /* Bus, device and function */
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struct {
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u8 link; /* IRQ line ID, chipset dependent, 0=not routed */
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u16 bitmap; /* Available IRQs */
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} __attribute__((packed)) irq[4];
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u8 slot; /* Slot number, 0=onboard */
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u8 rfu;
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} __attribute__((packed));
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struct irq_routing_table {
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u32 signature; /* PIRQ_SIGNATURE should be here */
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u16 version; /* PIRQ_VERSION */
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u16 size; /* Table size in bytes */
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u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */
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u16 exclusive_irqs; /* IRQs devoted exclusively to PCI usage */
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u16 rtr_vendor, rtr_device; /* Vendor and device ID of interrupt router */
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u32 miniport_data; /* Crap */
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u8 rfu[11];
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u8 checksum; /* Modulo 256 checksum must give zero */
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struct irq_info slots[0];
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} __attribute__((packed));
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extern unsigned int pcibios_irq_mask;
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extern int pcibios_scanned;
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extern spinlock_t pci_config_lock;
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extern int (*pcibios_enable_irq)(struct pci_dev *dev);
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