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/******************************************************************************
* pci.c
*
* Architecture-dependent PCI access functions.
*/
#include <xen/spinlock.h>
#include <xen/pci.h>
#include <asm/io.h>
#include <xsm/xsm.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);
}
int pci_conf_write_intercept(unsigned int seg, unsigned int bdf,
unsigned int reg, unsigned int size,
uint32_t *data)
{
struct pci_dev *pdev;
int rc = xsm_pci_config_permission(XSM_HOOK, current->domain, bdf,
reg, reg + size - 1, 1);
if ( rc < 0 )
return rc;
ASSERT(!rc);
/*
* Avoid expensive operations when no hook is going to do anything
* for the access anyway.
*/
if ( reg < 64 || reg >= 256 )
return 0;
pcidevs_lock();
pdev = pci_get_pdev(NULL, PCI_SBDF(seg, bdf));
if ( pdev )
rc = pci_msi_conf_write_intercept(pdev, reg, size, data);
pcidevs_unlock();
return rc;
}
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