Re: Zero page

[Antti Kantee <pooka%cs.hut.fi@localhost>]

On Wed Feb 03 2010 at 03:06:00 +0900, Masao Uebayashi wrote:
> I need to add zero-page to support XIP.  Unallocated blocks are redirected
> to this.  Basically it's a static simgle page filled with zero.
> 
>       void *pmap_zeropage;
>       paddr_t pmap_zeropage_phys_addr;
> 
> and initialized by pmap.c like:
> 
>       pmap_zeropage = (void *)uvm_pageboot_alloc(PAGE_SIZE);
>       pmap_zeropage_phys_addr = MIPS_KSEG0_TO_PHYS(pmap_zeropage);
> 
> Because it's used publically (from the coming custome genfs_getpages()), it's
> defined somewhere like uvm_page.h.

Why does it need to be in pmap?