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/******************************************************************************
* pci.c
*
* Architecture-dependent PCI access functions.
*/
#include <xen/spinlock.h>
#include <xen/pci.h>
#include <asm/io.h>
static DEFINE_SPINLOCK(pci_config_lock);
uint32_t pci_conf_read(uint32_t cf8, uint8_t offset, uint8_t bytes)
{
unsigned long flags;
uint32_t value;
BUG_ON((offset + bytes) > 4);
spin_lock_irqsave(&pci_config_lock, flags);
outl(cf8, 0xcf8);
switch ( bytes )
{
case 1:
value = inb(0xcfc + offset);
break;
case 2:
value = inw(0xcfc + offset);
break;
case 4:
value = inl(0xcfc + offset);
break;
default:
value = 0;
BUG();
}
spin_unlock_irqrestore(&pci_config_lock, flags);
return value;
}
void pci_conf_write(uint32_t cf8, uint8_t offset, uint8_t bytes, uint32_t data)
{
unsigned long flags;
BUG_ON((offset + bytes) > 4);
spin_lock_irqsave(&pci_config_lock, flags);
outl(cf8, 0xcf8);
switch ( bytes )
{
case 1:
outb((uint8_t)data, 0xcfc + offset);
break;
case 2:
outw((uint16_t)data, 0xcfc + offset);
break;
case 4:
outl(data, 0xcfc + offset);
break;
}
spin_unlock_irqrestore(&pci_config_lock, flags);
}
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