Tuesday, October 21, 2014

What is ioremap() ?

ioremap() function is used to map the physical addres of an I/O device to the kernel virtual address.Kernel creates a page table i.e mapping of virtual address to the physical address requested.When we do iounmap() this mapping is destroyed.

void *ioremap(unsigned long phys_addr, unsigned long size);

void iounmap(void * addr);




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