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57 #include <mach/vm_param.h>
58 #include <vm/vm_kern.h>
59 #include <vm/vm_map.h>
61 #include <arm/io_map_entries.h>
62 #include <san/kasan.h>
64 extern vm_offset_t virtual_space_start
; /* Next available kernel VA */
67 * Allocate and map memory for devices that may need to be mapped before
71 io_map(vm_map_offset_t phys_addr
, vm_size_t size
, unsigned int flags
)
73 return io_map_with_prot(phys_addr
, size
, flags
, VM_PROT_READ
| VM_PROT_WRITE
);
77 * Allocate and map memory for devices that may need to be mapped before
78 * Mach VM is running. Allows caller to specify mapping protection
81 io_map_with_prot(vm_map_offset_t phys_addr
, vm_size_t size
, unsigned int flags
, vm_prot_t prot
)
83 vm_offset_t start
, start_offset
;
85 start_offset
= phys_addr
& PAGE_MASK
;
87 phys_addr
-= start_offset
;
89 if (kernel_map
== VM_MAP_NULL
) {
91 * VM is not initialized. Grab memory.
93 start
= virtual_space_start
;
94 virtual_space_start
+= round_page(size
);
96 assert(flags
== VM_WIMG_WCOMB
|| flags
== VM_WIMG_IO
);
98 if (flags
== VM_WIMG_WCOMB
) {
99 (void) pmap_map_bd_with_options(start
, phys_addr
, phys_addr
+ round_page(size
),
100 prot
, PMAP_MAP_BD_WCOMB
);
102 (void) pmap_map_bd(start
, phys_addr
, phys_addr
+ round_page(size
),
106 (void) kmem_alloc_pageable(kernel_map
, &start
, round_page(size
), VM_KERN_MEMORY_IOKIT
);
107 (void) pmap_map(start
, phys_addr
, phys_addr
+ round_page(size
),
111 kasan_notify_address(start
+ start_offset
, size
);
113 return start
+ start_offset
;
116 /* just wrap this since io_map handles it */
119 io_map_spec(vm_map_offset_t phys_addr
, vm_size_t size
, unsigned int flags
)
121 return io_map(phys_addr
, size
, flags
);