Re: Zero page

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

> 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.

did you look at uvm_loanzero, which does something similar?

YAMAMOTO Takashi

> 
>       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.
> 
> Masao
> 
> -- 
> Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635