pci-lib.c

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>

unsigned long PCIBIOS_MIN_IO = 0x0000;
unsigned long PCIBIOS_MIN_MEM = 0;

/*
 * We need to avoid collisions with `mirrored' VGA ports
 * and other strange ISA hardware, so we always want the
 * addresses to be allocated in the 0x000-0x0ff region
 * modulo 0x400.
 */
void pcibios_align_resource(void *data, struct resource *res,
			    resource_size_t size, resource_size_t align)
{
	struct pci_dev *dev = data;
	struct pci_channel *chan = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
		if (start < PCIBIOS_MIN_IO + chan->io_resource->start)
			start = PCIBIOS_MIN_IO + chan->io_resource->start;

		/*
                 * Put everything into 0x00-0xff region modulo 0x400.
		 */
		if (start & 0x300) {
			start = (start + 0x3ff) & ~0x3ff;
			res->start = start;
		}
	} else if (res->flags & IORESOURCE_MEM) {
		if (start < PCIBIOS_MIN_MEM + chan->mem_resource->start)
			start = PCIBIOS_MIN_MEM + chan->mem_resource->start;
	}

	res->start = start;
}

int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
			enum pci_mmap_state mmap_state, int write_combine)
{
	/*
	 * I/O space can be accessed via normal processor loads and stores on
	 * this platform but for now we elect not to do this and portable
	 * drivers should not do this anyway.
	 */
	if (mmap_state == pci_mmap_io)
		return -EINVAL;

	/*
	 * Ignore write-combine; for now only return uncached mappings.
	 */
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			       vma->vm_end - vma->vm_start,
			       vma->vm_page_prot);
}

#ifdef CONFIG_HOTPLUG
EXPORT_SYMBOL(pcibios_resource_to_bus);
EXPORT_SYMBOL(pcibios_bus_to_resource);
EXPORT_SYMBOL(PCIBIOS_MIN_IO);
EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
#endif