A question about map_page
kang shuo
blackfin.kang at gmail.com
Sat Jun 30 13:31:36 EST 2007
hi:
I had read some ppc code in linux-2.6.20. There is a question
about map_page function. map_page seems to implement the map between
virtual address and physical address. But I can not understand how the
tlb entry operation is done in the code in map_page. The map_page is
as the following:
int
map_page(unsigned long va, phys_addr_t pa, int flags)
{
pmd_t *pd;
pte_t *pg;
int err = -ENOMEM;
/* Use upper 10 bits of VA to index the first level map */
pd = pmd_offset(pgd_offset_k(va), va);
/* Use middle 10 bits of VA to index the second-level map */
pg = pte_alloc_kernel(pd, va);
if (pg != 0) {
err = 0;
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
if (mem_init_done)
flush_HPTE(0, va, pmd_val(*pd));
}
return err;
}
Could anyone give me some hints about where and when tlb entry
is setup according to map_page function. That is very appreciate.
-- Thanks
-- Michael.Kang
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