pci-direct.h

xen 3.2.2 源码

#ifndef ASM_PCI_DIRECT_H
#define ASM_PCI_DIRECT_H 1

#include <xen/types.h>
#include <asm/io.h>

/* Direct PCI access. This is used for PCI accesses in early boot before
   the PCI subsystem works. */

#define PDprintk(x...)

static inline u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
{
    u32 v;
    outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
    v = inl(0xcfc);
    if (v != 0xffffffff)
        PDprintk("%x reading 4 from %x: %x\n", slot, offset, v);
    return v;
}

static inline u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
{
    u8 v;
    outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
    v = inb(0xcfc + (offset&3));
    PDprintk("%x reading 1 from %x: %x\n", slot, offset, v);
    return v;
}

static inline u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
{
    u16 v;
    outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
    v = inw(0xcfc + (offset&2));
    PDprintk("%x reading 2 from %x: %x\n", slot, offset, v);
    return v;
}

static inline void write_pci_config(
    u8 bus, u8 slot, u8 func, u8 offset, u32 val)
{
    PDprintk("%x writing to %x: %x\n", slot, offset, val);
    outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
    outl(val, 0xcfc);
}

#endif