ioremap_nocache (9) Linux Manual Page
ioremap_nocache – map bus memory into CPU space
Synopsis
void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);Arguments
offset
-
- bus address of the memory
size
- size of the resource to map
Description
ioremap performs a platform specific sequence of operations to make bus memory CPU accessible via the readb/readw/readl/writeb/ writew/writel functions and the other mmio helpers. The returned address is not guaranteed to be usable directly as a virtual address.
If the area you are trying to map is a PCI BAR you should have a look at pci_iomap.
Authors
Matthew Wilcox <matthew [at] wil.cx>
- Author.
Alan Cox <alan [at] lxorguk.ukuu.org.uk>
- Author.