+static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = swapper_pg_dir + pgd_index(addr);
+ if (pgd_none(*pgd)) {
+ pgd_ERROR(*pgd);
+ return;
+ }
+
+ pmd = pmd_offset(pgd, addr);
+ if (pmd_none(*pmd)) {
+ pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
+ set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
+ if (pte != pte_offset_kernel(pmd, 0)) {
+ pmd_ERROR(*pmd);
+ return;
+ }
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+ if (!pte_none(*pte)) {
+ pte_ERROR(*pte);
+ return;
+ }
+
+ set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
+
+ __flush_tlb_page(get_asid(), addr);
+}
+
+/*
+ * As a performance optimization, other platforms preserve the fixmap mapping
+ * across a context switch, we don't presently do this, but this could be done
+ * in a similar fashion as to the wired TLB interface that sh64 uses (by way
+ * of the memorry mapped UTLB configuration) -- this unfortunately forces us to
+ * give up a TLB entry for each mapping we want to preserve. While this may be
+ * viable for a small number of fixmaps, it's not particularly useful for
+ * everything and needs to be carefully evaluated. (ie, we may want this for
+ * the vsyscall page).
+ *
+ * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
+ * in at __set_fixmap() time to determine the appropriate behavior to follow.
+ *
+ * -- PFM.
+ */
+void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
+{
+ unsigned long address = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+
+ set_pte_phys(address, phys, prot);
+}
+