xnu-6153.11.26.tar.gz

[apple/xnu.git] / osfmk / arm / io_map.c

diff --git a/osfmk/arm/io_map.c b/osfmk/arm/io_map.c
index bae84c7807d562159774c04ca0b03e7918e43c97..1bb8b82d6e238635fd5e5793b9f4c5343834498d 100644 (file)
--- a/osfmk/arm/io_map.c
+++ b/osfmk/arm/io_map.c
@@ -69,6 +69,16 @@ extern vm_offset_t      virtual_space_start;     /* Next available kernel VA */
  */
 vm_offset_t
 io_map(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
+{
+       return io_map_with_prot(phys_addr, size, flags, VM_PROT_READ | VM_PROT_WRITE);
+}
+
+/*
+ * Allocate and map memory for devices that may need to be mapped before
+ * Mach VM is running. Allows caller to specify mapping protection
+ */
+vm_offset_t
+io_map_with_prot(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags, vm_prot_t prot)
 {
        vm_offset_t     start, start_offset;
 
@@ -87,15 +97,15 @@ io_map(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
 
                if (flags == VM_WIMG_WCOMB) {
                        (void) pmap_map_bd_with_options(start, phys_addr, phys_addr + round_page(size),
-                           VM_PROT_READ | VM_PROT_WRITE, PMAP_MAP_BD_WCOMB);
+                           prot, PMAP_MAP_BD_WCOMB);
                } else {
                        (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
-                           VM_PROT_READ | VM_PROT_WRITE);
+                           prot);
                }
        } else {
                (void) kmem_alloc_pageable(kernel_map, &start, round_page(size), VM_KERN_MEMORY_IOKIT);
                (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
-                   VM_PROT_READ | VM_PROT_WRITE, flags);
+                   prot, flags);
        }
 #if KASAN
        kasan_notify_address(start + start_offset, size);