Linux-mips port: HIGHMEM Address map

[<Rishabh@xxxxxxxxxxxx>]

Hi,

 

Guys I am trying to figure out the virtual address map of linux mips port for the HIGHMEM enabled kernel.

I am unable to figure out from which virtual address map is the HIGHMEM Memory starts.

 

I found in function mem_init()

 

                        high_memory = (KSEG1 – KSEG0) >> PAGE_SHIFT;

 

Also I have seen in many driver source codes that __virt_to_phys(high_memory) has been used, will that mean that virtual address for HIGHMEM is beginning from 0xa0000000.

 

If that is so then if I want to relocate it to KSEG3 which I feel will be free how can I do it?

I have my SDRAM mapped at 2 locations {virtual addresses} (0xa0000000 – 0xa3ffffff) and (0x80000000 – 0x83ffffff). Physical Address is (0x00000000 – 0x03ffffff).

 

I have also physical memory 0x20000000 – 0x23ffffff(physical address) to be used for HIGHMEM.

 

Regards,

 

Rishabh

 

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