1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 *
31 */
32
33#include <debug.h>
34#include <mach/vm_param.h>
35#include <vm/vm_kern.h>
36#include <vm/vm_map.h>
37#include <vm/vm_page.h>
38#include <ppc/pmap.h>
39#include <ppc/io_map_entries.h>
40#include <ppc/Firmware.h>
41#include <ppc/mappings.h>
42#include <ppc/proc_reg.h>
43
44extern vm_offset_t	virtual_avail;
45
46/*
47 * Allocate and map memory for devices that may need to be mapped
48 * outside the usual physical memory. If phys_addr is NULL then
49 * steal the appropriate number of physical pages from the vm
50 * system and map them.
51 *
52 * Note, this will onl
53 */
54vm_offset_t
55io_map(vm_offset_t phys_addr, vm_size_t size, unsigned int flags)
56{
57	vm_offset_t	start;
58	vm_size_t	i;
59	unsigned int    mflags;
60	vm_page_t 	m;
61
62	mflags = mmFlgBlock | mmFlgUseAttr | (flags & VM_MEM_GUARDED) | ((flags & VM_MEM_NOT_CACHEABLE) >> 1);	/* Convert to our mapping_make flags */
63
64#if DEBUG
65	assert (kernel_map != VM_MAP_NULL);			/* VM must be initialised */
66#endif
67
68	if (phys_addr != 0) {						/* If they supplied a physical address, use it */
69
70		size = round_page(size + (phys_addr & PAGE_MASK));	/* Make sure we map all of it */
71
72		(void) kmem_alloc_pageable(kernel_map, &start, size);	/* Get some virtual addresses to use */
73
74		(void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
75			mflags,					/* Map with requested cache mode */
76			(size >> 12), VM_PROT_READ|VM_PROT_WRITE);
77
78		return (start + (phys_addr & PAGE_MASK));	/* Pass back the physical address */
79
80	} else {
81
82		(void) kmem_alloc_pageable(kernel_map, &start, size);	/* Get some virtual addresses */
83
84		mapping_prealloc(size);					/* Make sure there are enough free mappings */
85
86		for (i = 0; i < size ; i += PAGE_SIZE) {
87			m = VM_PAGE_NULL;
88			while ((m = vm_page_grab()) == VM_PAGE_NULL) {	/* Get a physical page */
89				VM_PAGE_WAIT();					/* Wait if we didn't have one */
90			}
91			vm_page_gobble(m);
92
93			(void)mapping_make(kernel_pmap,
94				(addr64_t)(start + i), m->phys_page,
95				mflags,					/* Map with requested cache mode */
96				1, VM_PROT_READ|VM_PROT_WRITE);
97
98		}
99
100		mapping_relpre();						/* Allow mapping release */
101		return start;
102	}
103}
104
105
106/*
107 * Allocate and map memory for devices before the VM system comes alive.
108 */
109
110vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size, unsigned int flags)
111{
112	vm_offset_t	start;
113	unsigned int    mflags;
114
115	if(kernel_map != VM_MAP_NULL) {				/* If VM system is up, redirect to normal routine */
116
117		return io_map(phys_addr, size, flags);			/* Map the address */
118
119	}
120
121	mflags = mmFlgBlock | mmFlgUseAttr | (flags & VM_MEM_GUARDED) | ((flags & VM_MEM_NOT_CACHEABLE) >> 1);	/* Convert to our mapping_make flags */
122
123	size = round_page(size + (phys_addr - (phys_addr & -PAGE_SIZE)));	/* Extend the length to include it all */
124	start = pmap_boot_map(size);				/* Get me some virtual address */
125
126	(void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
127		mflags,					/* Map with requested cache mode */
128		(size >> 12), VM_PROT_READ|VM_PROT_WRITE);
129
130	return (start + (phys_addr & PAGE_MASK));
131}
132