xnu-3789.51.2.tar.gz

[apple/xnu.git] / osfmk / x86_64 / pmap.c

diff --git a/osfmk/x86_64/pmap.c b/osfmk/x86_64/pmap.c
index ff941d2e23ab5cd0e1bc3a495a94b8cb78d3369a..cb643816851259087aac2b0a9c89cd9b980b10f1 100644 (file)
--- a/osfmk/x86_64/pmap.c
+++ b/osfmk/x86_64/pmap.c
@@ -3236,3 +3236,18 @@ void pmap_advise_pagezero_range(pmap_t lpmap, uint64_t low_bound) {
                mp_enable_preemption();
        }
 }
                mp_enable_preemption();
        }
 }

+
+void pmap_verify_noncacheable(uintptr_t vaddr) {
+       pt_entry_t *ptep = NULL;
+       ptep = pmap_pte(kernel_pmap, vaddr);
+       if (ptep == NULL) {
+               panic("pmap_verify_noncacheable: no translation for 0x%lx", vaddr);
+       }
+       /* Non-cacheable OK */
+       if (*ptep & (INTEL_PTE_NCACHE))
+               return;
+       /* Write-combined OK */
+       if (*ptep & (INTEL_PTE_PTA))
+               return;
+       panic("pmap_verify_noncacheable: IO read from a cacheable address? address: 0x%lx, PTE: %p, *PTE: 0x%llx", vaddr, ptep, *ptep);
+}