kolibrios-gitea/drivers/usb/uhci/pci.inc

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u32_t pciGetBaseSize(int bus, int devfn, int index,
Bool destructive, Bool *min)
{
int offset;
u32_t addr1;
u32_t addr2;
u32_t mask1;
u32_t mask2;
int bits = 0;
/*
* silently ignore bogus index values. Valid values are 0-6. 0-5 are
* the 6 base address registers, and 6 is the ROM base address register.
*/
if (index < 0 || index > 6)
return 0;
if (min)
*min = destructive;
/* Get the PCI offset */
if (index == 6)
offset = PCI_MAP_ROM_REG;
else
offset = PCI_MAP_REG_START + (index << 2);
addr1 = PciRead32(bus, devfn, offset);
/*
* Check if this is the second part of a 64 bit address.
* XXX need to check how endianness affects 64 bit addresses.
*/
if (index > 0 && index < 6) {
addr2 = PciRead32(bus, devfn, offset - 4);
if (PCI_MAP_IS_MEM(addr2) && PCI_MAP_IS64BITMEM(addr2))
return 0;
}
if (destructive) {
PciWrite32(bus, devfn, offset, 0xffffffff);
mask1 = PciRead32(bus, devfn, offset);
PciWrite32(bus, devfn, offset, addr1);
} else {
mask1 = addr1;
}
/* Check if this is the first part of a 64 bit address. */
if (index < 5 && PCI_MAP_IS_MEM(mask1) && PCI_MAP_IS64BITMEM(mask1))
{
if (PCIGETMEMORY(mask1) == 0)
{
addr2 = PciRead32(bus, devfn, offset + 4);
if (destructive)
{
PciWrite32(bus, devfn, offset + 4, 0xffffffff);
mask2 = PciRead32(bus, devfn, offset + 4);
PciWrite32(bus, devfn, offset + 4, addr2);
}
else
{
mask2 = addr2;
}
if (mask2 == 0)
return 0;
bits = 32;
while ((mask2 & 1) == 0)
{
bits++;
mask2 >>= 1;
}
if (bits > 32)
return bits;
}
}
if (index < 6)
if (PCI_MAP_IS_MEM(mask1))
mask1 = PCIGETMEMORY(mask1);
else
mask1 = PCIGETIO(mask1);
else
mask1 = PCIGETROM(mask1);
if (mask1 == 0)
return 0;
bits = 0;
while ((mask1 & 1) == 0) {
bits++;
mask1 >>= 1;
}
/* I/O maps can be no larger than 8 bits */
if ((index < 6) && PCI_MAP_IS_IO(addr1) && bits > 8)
bits = 8;
/* ROM maps can be no larger than 24 bits */
if (index == 6 && bits > 24)
bits = 24;
return bits;
}