hi,
i am newbies for mips. i want to mmap the kernel space address
0x1f00,0000 to user mode space? how to write the mmap file mothod?
here is my code, is it right? Would you like to give me some advise?
Thanks!
static int
test_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned long start = vma->vm_start;
unsigned long size = vma->vm_end - vma->vm_start;
unsigned long addr;
unsigned long __iomem *buf;
#if 0
addr = 0x1f000000;
addr += vma->vm_pgoff;
#else
buf = (unsigned long __iomem *)ioremap_nocache(0x1f00000, size);
addr = vmalloc_to_pfn((void *)buf);
addr += vma->vm_pgoff;
#endif
remap_pfn_range(vma, start, addr, size, PAGE_SHARED);
return 0;
}
Best,
Figo.zhang
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