+#if XNU_MONITOR
+/*
+ * pmap_set_range_xprr_perm takes a range (specified using start and end) that
+ * falls within the physical aperture. All mappings within this range have
+ * their protections changed from those specified by the expected_perm to those
+ * specified by the new_perm.
+ */
+static void
+pmap_set_range_xprr_perm(vm_address_t start,
+ vm_address_t end,
+ unsigned int expected_perm,
+ unsigned int new_perm)
+{
+#if (__ARM_VMSA__ == 7)
+#error This function is not supported on older ARM hardware
+#else
+ pmap_t pmap = NULL;
+
+ vm_address_t va = 0;
+ vm_address_t tte_start = 0;
+ vm_address_t tte_end = 0;
+
+ tt_entry_t *tte_p = NULL;
+ pt_entry_t *pte_p = NULL;
+ pt_entry_t *cpte_p = NULL;
+ pt_entry_t *bpte_p = NULL;
+ pt_entry_t *epte_p = NULL;
+
+ tt_entry_t tte = 0;
+ pt_entry_t cpte = 0;
+ pt_entry_t template = 0;
+
+ pmap = kernel_pmap;
+
+ va = start;
+
+ /*
+ * Validate our arguments; any invalid argument will be grounds for a
+ * panic.
+ */
+ if ((start | end) % ARM_PGBYTES) {
+ panic("%s: start or end not page aligned, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ if (start > end) {
+ panic("%s: start > end, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ if (start < gVirtBase) {
+ panic("%s: start is before physical aperture, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ if (end > static_memory_end) {
+ panic("%s: end is after physical aperture, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ if ((new_perm > XPRR_MAX_PERM) || (expected_perm > XPRR_MAX_PERM)) {
+ panic("%s: invalid XPRR index, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ /*
+ * Walk over the PTEs for the given range, and set the protections on
+ * those PTEs.
+ */
+ while (va < end) {
+ tte_start = va;
+ tte_end = ((va + pt_attr_twig_size(native_pt_attr)) & ~pt_attr_twig_offmask(native_pt_attr));
+
+ if (tte_end > end) {
+ tte_end = end;
+ }
+
+ tte_p = pmap_tte(pmap, va);
+
+ /*
+ * The physical aperture should not have holes.
+ * The physical aperture should be contiguous.
+ * Do not make eye contact with the physical aperture.
+ */
+ if (tte_p == NULL) {
+ panic("%s: physical aperture tte is NULL, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ tte = *tte_p;
+
+ if ((tte & ARM_TTE_TYPE_MASK) == ARM_TTE_TYPE_TABLE) {
+ /*
+ * Walk over the given L3 page table page and update the
+ * PTEs.
+ */
+ pte_p = (pt_entry_t *)ttetokv(tte);
+ bpte_p = &pte_p[ptenum(va)];
+ epte_p = bpte_p + ((tte_end - va) >> pt_attr_leaf_shift(native_pt_attr));
+
+ for (cpte_p = bpte_p; cpte_p < epte_p;
+ cpte_p += PAGE_SIZE / ARM_PGBYTES, va += PAGE_SIZE) {
+ int pai = (int)pa_index(pte_to_pa(*cpte_p));
+ LOCK_PVH(pai);
+ cpte = *cpte_p;
+
+ /*
+ * Every PTE involved should be valid, should
+ * not have the hint bit set, and should have
+ * Every valid PTE involved should
+ * not have the hint bit set and should have
+ * the expected APRR index.
+ */
+ if ((cpte & ARM_PTE_TYPE_MASK) ==
+ ARM_PTE_TYPE_FAULT) {
+ panic("%s: physical aperture PTE is invalid, va=%p, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)va,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ UNLOCK_PVH(pai);
+ continue;
+ }
+
+ if (cpte & ARM_PTE_HINT_MASK) {
+ panic("%s: physical aperture PTE has hint bit set, va=%p, cpte=0x%llx, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ (void *)va, cpte,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ if (pte_to_xprr_perm(cpte) != expected_perm) {
+ panic("%s: perm=%llu does not match expected_perm, cpte=0x%llx, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ pte_to_xprr_perm(cpte), cpte,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ template = cpte;
+ template &= ~ARM_PTE_XPRR_MASK;
+ template |= xprr_perm_to_pte(new_perm);
+
+ WRITE_PTE_STRONG(cpte_p, template);
+ UNLOCK_PVH(pai);
+ }
+ } else {
+ panic("%s: tte=0x%llx is not a table type entry, "
+ "start=%p, end=%p, new_perm=%u, expected_perm=%u",
+ __FUNCTION__,
+ tte,
+ (void *)start, (void *)end, new_perm, expected_perm);
+ }
+
+ va = tte_end;
+ }
+
+ PMAP_UPDATE_TLBS(pmap, start, end, false);
+#endif /* (__ARM_VMSA__ == 7) */
+}
+
+/*
+ * A convenience function for setting protections on a single page.
+ */
+static inline void
+pmap_set_xprr_perm(vm_address_t page_kva,
+ unsigned int expected_perm,
+ unsigned int new_perm)
+{
+ pmap_set_range_xprr_perm(page_kva, page_kva + PAGE_SIZE, expected_perm, new_perm);
+}
+#endif /* XNU_MONITOR */
projects / apple / xnu.git / blobdiff