xnu-1699.26.8.tar.gz

[apple/xnu.git] / osfmk / i386 / pmap_x86_common.c

diff --git a/osfmk/i386/pmap_x86_common.c b/osfmk/i386/pmap_x86_common.c
index d7e63d6b04116582fec22825b64112a339f56707..9061d73cf06267a719e7ce84547649e3509d8451 100644 (file)
--- a/osfmk/i386/pmap_x86_common.c
+++ b/osfmk/i386/pmap_x86_common.c
@@ -1429,3 +1429,52 @@ pmap_change_wiring(
 
        PMAP_UNLOCK(map);
 }
+
+/*
+ *     "Backdoor" direct map routine for early mappings.
+ *     Useful for mapping memory outside the range
+ *      Sets A, D and NC if requested
+ */
+
+vm_offset_t
+pmap_map_bd(
+       vm_offset_t     virt,
+       vm_map_offset_t start_addr,
+       vm_map_offset_t end_addr,
+       vm_prot_t       prot,
+       unsigned int    flags)
+{
+       pt_entry_t      template;
+       pt_entry_t      *pte;
+       spl_t           spl;
+       vm_offset_t     base = virt;
+       template = pa_to_pte(start_addr)
+               | INTEL_PTE_REF
+               | INTEL_PTE_MOD
+               | INTEL_PTE_WIRED
+               | INTEL_PTE_VALID;
+
+       if ((flags & (VM_MEM_NOT_CACHEABLE | VM_WIMG_USE_DEFAULT)) == VM_MEM_NOT_CACHEABLE) {
+               template |= INTEL_PTE_NCACHE;
+               if (!(flags & (VM_MEM_GUARDED)))
+                       template |= INTEL_PTE_PTA;
+       }
+       if (prot & VM_PROT_WRITE)
+               template |= INTEL_PTE_WRITE;
+
+       while (start_addr < end_addr) {
+               spl = splhigh();
+               pte = pmap_pte(kernel_pmap, (vm_map_offset_t)virt);
+               if (pte == PT_ENTRY_NULL) {
+                       panic("pmap_map_bd: Invalid kernel address\n");
+               }
+               pmap_store_pte(pte, template);
+               splx(spl);
+               pte_increment_pa(template);
+               virt += PAGE_SIZE;
+               start_addr += PAGE_SIZE;
+       }
+       flush_tlb_raw();
+       PMAP_UPDATE_TLBS(kernel_pmap, base, base + end_addr - start_addr);
+       return(virt);
+}