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git.saurik.com Git - apple/xnu.git/blob - osfmk/i386/AT386/himem.c
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2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
4 * @APPLE_LICENSE_HEADER_START@
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
20 * @APPLE_LICENSE_HEADER_END@
23 * @OSF_FREE_COPYRIGHT@
28 * Revision 1.1.1.1 1998/09/22 21:05:38 wsanchez
29 * Import of Mac OS X kernel (~semeria)
31 * Revision 1.1.1.1 1998/03/07 02:25:39 wsanchez
32 * Import of OSF Mach kernel (~mburg)
34 * Revision 1.3.17.7 1995/08/21 20:33:13 devrcs
35 * ri-osc CR1547: Fix himem buffer translation to cope with non
36 * page-aligned addresses.
37 * [1995/08/08 16:51:58 bolinger]
39 * Revision 1.3.17.6 1995/02/24 15:51:12 alanl
40 * DIPC: Merge from nmk17b2 to nmk18b8.
41 * Notes: lock package cleanup.
45 * Revision 1.3.17.5 1995/01/26 22:14:52 ezf
46 * removed extraneous CMU CR
47 * [1995/01/26 20:24:45 ezf]
49 * Revision 1.3.17.4 1995/01/10 04:51:04 devrcs
50 * mk6 CR801 - merge up from nmk18b4 to nmk18b7
51 * * Rev 1.3.17.3 1994/10/21 18:41:39 joe
53 * [1994/12/09 20:37:48 dwm]
55 * mk6 CR764 - s/spinlock/simple_lock/ (name change only)
56 * [1994/11/10 05:25:33 dwm]
58 * mk6 CR668 - 1.3b26 merge
59 * * Revision 1.3.5.8 1994/05/06 18:44:06 tmt
60 * Fix prototypes for new device signatures.
61 * * Revision 1.3.5.6 1993/12/10 18:08:15 jeffc
62 * CR10305 -- locking bug in himem_reserve(): change call to
63 * vm_page_free to VM_PAGE_FREE.
64 * * Revision 1.3.5.5 1993/11/19 17:56:58 jeffc
65 * CR10125 -- Uninitialized lock in himem_convert. Add himem_init
66 * CR9461 -- Locking bug in himem_convert - must retake lock after
69 * [1994/11/04 09:07:39 dwm]
71 * Revision 1.3.17.1 1994/06/14 03:04:20 toshi
73 * [1994/06/14 01:06:55 toshi]
75 * Revision 1.3.15.2 1994/06/08 21:14:24 dswartz
77 * [1994/06/08 21:12:29 dswartz]
79 * Revision 1.3.15.1 1994/05/19 20:30:23 dwm
80 * mk6 CR 74. Locking bug in himem_reserve(): use VM_PAGE_FREE.
81 * mk6 CR 9461. Init hil_lock used by himem_convert();
82 * retake lock after sleeping.
83 * [1994/05/19 20:30:07 dwm]
85 * Revision 1.3.11.1 1994/02/09 07:27:07 bernadat
86 * Added himem_init() for module initialization.
89 * Take back hil_lock lock on return from thread_sleep()
92 * Add vm_page_gobble() calls where needed. (dwm bug #542)
93 * Change from NORMA_MK14.6 [1993/02/09 22:24:00 dwm]
97 * Revision 1.3.5.4 1993/08/09 19:37:19 dswartz
98 * Add ANSI prototypes - CR#9523
99 * [1993/08/06 17:50:02 dswartz]
101 * Revision 1.3.5.3 1993/08/03 22:21:26 bernard
102 * CR#9523 - ANSI prototype fixes.
103 * [1993/08/03 15:34:10 bernard]
105 * Revision 1.3.5.2 1993/06/09 02:25:18 gm
106 * CR9157 - Find himem.h in the right place.
107 * [1993/05/28 17:27:23 brezak]
109 * Revision 1.3 1993/04/19 16:09:46 devrcs
110 * make endif tags ansi compliant/include files
111 * [1993/02/20 21:46:44 david]
113 * Print an appropriate message when going out of HIMEM pages.
114 * [93/01/26 bernadat]
116 * Revision 1.2 1992/11/25 01:07:08 robert
117 * integrate changes below for norma_14
118 * [1992/11/13 19:28:44 robert]
124 * support of memory above 16 Megs for DMA limited to memory
125 * below 16 Megs. Copies high memory lo low memory before DMA
126 * write operations and does the reverse at completion time for
127 * DMA read operations
131 #include <platforms.h>
132 #include <kern/lock.h>
133 #include <mach/vm_param.h>
134 #include <vm/vm_page.h>
135 #include <i386/AT386/himem.h>
136 #include <kern/kalloc.h>
137 #include <kern/spl.h>
138 #include <mach/boolean.h>
139 #include <kern/misc_protos.h>
140 #include <i386/AT386/misc_protos.h>
143 decl_simple_lock_data(,hil_lock
)
146 int himem_request
; /* number of requests */
147 int himem_used
; /* number of times used */
148 #endif /* HIMEM_STATS */
154 simple_lock_init(&hil_lock
, ETAP_VM_HIMEM
);
158 * Called by drivers, this indicates himem that this driver might need
159 * to allocate as many as npages pages in a single I/O DMA transfer
167 vm_page_t free_head
= VM_PAGE_NULL
;
171 extern vm_offset_t avail_end
;
173 if (avail_end
<= HIGH_MEM
)
175 hil
= (hil_t
)kalloc(npages
*sizeof(struct himem_link
));
177 panic("himem_reserve: kalloc failed\n");
179 for (i
=0; i
< npages
-1; i
++)
180 (hil
+i
)->next
= hil
+i
+1;
183 * This is the only way of getting low physical pages
184 * wtithout changing VM internals
186 for (i
=0; i
!= npages
;) {
187 if ((low
= vm_page_grab()) == VM_PAGE_NULL
)
188 panic("No low memory pages for himem\n");
189 vm_page_gobble(low
); /* mark as consumed internally */
190 if (_high_mem_page(low
->phys_addr
)) {
191 low
->pageq
.next
= (queue_entry_t
)free_head
;
194 (hil
+i
)->low_page
= low
->phys_addr
;
199 for (low
= free_head
; low
; low
= free_head
) {
200 free_head
= (vm_page_t
) low
->pageq
.next
;
205 simple_lock(&hil_lock
);
206 (hil
+npages
-1)->next
= hil_head
;
208 simple_unlock(&hil_lock
);
213 * Called by driver at DMA initialization time. Converts a high memory
214 * physical page to a low memory one. If operation is a write,
215 * [phys_addr, phys_addr+length-1] is copied to new page. Caller must
216 * provide a pointer to a pointer to a himem_list. This is used to store
217 * all the conversions and is use at completion time to revert the pages.
218 * This pointer must point to a null hil_t value for the call on the first
219 * page of a DMA transfer.
224 vm_offset_t phys_addr
,
231 vm_offset_t offset
= phys_addr
& (I386_PGBYTES
- 1);
233 assert (offset
+ length
<= I386_PGBYTES
);
236 simple_lock(&hil_lock
);
237 while (!(h
= hil_head
)) {
238 printf("WARNING: out of HIMEM pages\n");
239 thread_sleep_simple_lock((event_t
)&hil_head
,
240 simple_lock_addr(hil_lock
),
242 /* hil_lock relocked */
244 hil_head
= hil_head
->next
;
245 simple_unlock(&hil_lock
);
248 h
->high_addr
= phys_addr
;
250 if (io_op
== D_WRITE
) {
251 bcopy((char *)phystokv(phys_addr
), (char *)phystokv(h
->low_page
+ offset
),
259 assert(!*hil
|| (*hil
)->high_addr
);
263 return(h
->low_page
+ offset
);
267 * Called by driver at DMA completion time. Converts a list of low memory
268 * physical page to the original high memory one. If operation was read,
269 * [phys_addr, phys_addr+lenght-1] is copied to original page
277 boolean_t wakeup
= FALSE
;
282 bcopy((char *)phystokv(hil
->low_page
+ hil
->offset
),
283 (char *)phystokv(hil
->high_addr
),
291 simple_lock(&hil_lock
);
292 if (!(hil
->next
= hil_head
))
295 simple_unlock(&hil_lock
);
300 thread_wakeup((event_t
)&hil_head
);