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)); }
int map_page(unsigned long va, unsigned long pa, int flags) { pmd_t *pd; pte_t *pg; int err = -ENOMEM; spin_lock(&init_mm.page_table_lock); /* 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(&init_mm, pd, va); if (pg != 0) { err = 0; set_pte(pg, mk_pte_phys(pa & PAGE_MASK, __pgprot(flags))); if (mem_init_done) flush_HPTE(0, va, pg); } spin_unlock(&init_mm.page_table_lock); return err; }