2 * This is part of the Driver for Video Capture Cards (Frame grabbers)
3 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
5 * Copyright Roger Hardiman.
7 * bktr_mem : This kernel module allows us to keep our allocated
8 * contiguous memory for the video buffer, DMA programs and VBI data
9 * while the main bktr driver is unloaded and reloaded.
10 * This avoids the problem of trying to allocate contiguous each
11 * time the bktr driver is loaded.
15 * SPDX-License-Identifier: BSD-4-Clause
17 * 1. Redistributions of source code must retain the
18 * Copyright (c) 2000 Roger Hardiman
19 * All rights reserved.
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 * 3. All advertising materials mentioning features or use of this software
30 * must display the following acknowledgement:
31 * This product includes software developed by Roger Hardiman
32 * 4. The name of the author may not be used to endorse or promote products
33 * derived from this software without specific prior written permission.
35 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
36 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
37 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
39 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
44 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
45 * POSSIBILITY OF SUCH DAMAGE.
48 #include <sys/cdefs.h>
49 __FBSDID("$FreeBSD$");
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/module.h>
54 #include <sys/systm.h>
55 #include <dev/bktr/bktr_mem.h>
57 struct memory_pointers {
60 vm_offset_t odd_dma_prog;
62 vm_offset_t vbibuffer;
66 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
68 /*************************************************************/
71 bktr_mem_modevent(module_t mod, int type, void *unused){
75 printf("bktr_mem: memory holder loaded\n");
77 * bzero((caddr_t)memory_list, sizeof(memory_list));
78 * causes a panic. So use a simple for loop for now.
84 d = (unsigned char *)memory_list;
85 for (x = 0; x < sizeof(memory_list); x++)
90 printf("bktr_mem: memory holder cannot be unloaded\n");
99 /*************************************************************/
102 bktr_has_stored_addresses(int unit)
105 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
106 printf("bktr_mem: Unit number %d invalid\n", unit);
110 return memory_list[unit].addresses_stored;
113 /*************************************************************/
116 bktr_store_address(int unit, int type, vm_offset_t addr)
119 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
120 printf("bktr_mem: Unit number %d invalid for memory type %d, address %p\n",
121 unit, type, (void *) addr);
126 case BKTR_MEM_DMA_PROG:
127 memory_list[unit].dma_prog = addr;
128 memory_list[unit].addresses_stored = 1;
130 case BKTR_MEM_ODD_DMA_PROG:
131 memory_list[unit].odd_dma_prog = addr;
132 memory_list[unit].addresses_stored = 1;
134 case BKTR_MEM_VBIDATA:
135 memory_list[unit].vbidata = addr;
136 memory_list[unit].addresses_stored = 1;
138 case BKTR_MEM_VBIBUFFER:
139 memory_list[unit].vbibuffer = addr;
140 memory_list[unit].addresses_stored = 1;
143 memory_list[unit].buf = addr;
144 memory_list[unit].addresses_stored = 1;
147 printf("bktr_mem: Invalid memory type %d for bktr%d, address %p\n",
148 type, unit, (void *)addr);
153 /*************************************************************/
156 bktr_retrieve_address(int unit, int type)
159 if (unit < 0 || unit >= BKTR_MEM_MAX_DEVICES) {
160 printf("bktr_mem: Unit number %d too large for memory type %d\n",
165 case BKTR_MEM_DMA_PROG:
166 return memory_list[unit].dma_prog;
167 case BKTR_MEM_ODD_DMA_PROG:
168 return memory_list[unit].odd_dma_prog;
169 case BKTR_MEM_VBIDATA:
170 return memory_list[unit].vbidata;
171 case BKTR_MEM_VBIBUFFER:
172 return memory_list[unit].vbibuffer;
174 return memory_list[unit].buf;
176 printf("bktr_mem: Invalid memory type %d for bktr%d",
182 /*************************************************************/
184 static moduledata_t bktr_mem_mod = {
191 * The load order is First and module type is Driver to make sure bktr_mem
192 * loads (and initialises) before bktr when both are loaded together.
194 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
195 MODULE_VERSION(bktr_mem, 1);