6 * This is prt of the Driver for Video Capture Cards (Frame grabbers)
7 * and TV Tuner cards using the Brooktree Bt848, Bt848A, Bt849A, Bt878, Bt879
9 * Copyright Roger Hardiman.
11 * bktr_mem : This kernel module allows us to keep our allocated
12 * contiguous memory for the video buffer, DMA programs and VBI data
13 * while the main bktr driver is unloaded and reloaded.
14 * This avoids the problem of trying to allocate contiguous each
15 * time the bktr driver is loaded.
19 * 1. Redistributions of source code must retain the
20 * Copyright (c) 2000 Roger Hardiman
21 * All rights reserved.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * This product includes software developed by Roger Hardiman
34 * 4. The name of the author may not be used to endorse or promote products
35 * derived from this software without specific prior written permission.
37 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
38 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
39 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
41 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
42 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
43 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
46 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
47 * POSSIBILITY OF SUCH DAMAGE.
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/systm.h>
54 #include <dev/bktr/bktr_mem.h>
56 struct memory_pointers {
59 vm_offset_t odd_dma_prog;
61 vm_offset_t vbibuffer;
65 static struct memory_pointers memory_list[BKTR_MEM_MAX_DEVICES];
67 /*************************************************************/
70 bktr_mem_modevent(module_t mod, int type, void *unused){
75 printf("bktr_mem: memory holder loaded\n");
77 * bzero causes a panic.
78 bzero((caddr_t)memory_list, sizeof(memory_list));
79 * So use a simple for loop for now.
82 unsigned char *d = (unsigned char *)memory_list;
83 for (x=0; x< sizeof(memory_list); x++) {
91 printf("bktr_mem: memory holder cannot be unloaded\n");
100 /*************************************************************/
103 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) {
118 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
119 printf("bktr_mem: Unit number %d invalid for memory type %d, address 0x%x\n"
125 case BKTR_MEM_DMA_PROG: memory_list[unit].dma_prog = addr;
126 memory_list[unit].addresses_stored = 1;
128 case BKTR_MEM_ODD_DMA_PROG: memory_list[unit].odd_dma_prog = addr;
129 memory_list[unit].addresses_stored = 1;
131 case BKTR_MEM_VBIDATA: memory_list[unit].vbidata = addr;
132 memory_list[unit].addresses_stored = 1;
134 case BKTR_MEM_VBIBUFFER: memory_list[unit].vbibuffer = addr;
135 memory_list[unit].addresses_stored = 1;
137 case BKTR_MEM_BUF: memory_list[unit].buf = addr;
138 memory_list[unit].addresses_stored = 1;
140 default: printf("bktr_mem: Invalid memory type %d for bktr%d, address 0x%xn",
146 /*************************************************************/
149 bktr_retrieve_address(int unit, int type) {
151 if ((unit < 0) || (unit >= BKTR_MEM_MAX_DEVICES)) {
152 printf("bktr_mem: Unit number %d too large for memory type %d\n",unit,type);
156 case BKTR_MEM_DMA_PROG: return memory_list[unit].dma_prog;
157 case BKTR_MEM_ODD_DMA_PROG: return memory_list[unit].odd_dma_prog;
158 case BKTR_MEM_VBIDATA: return memory_list[unit].vbidata;
159 case BKTR_MEM_VBIBUFFER: return memory_list[unit].vbibuffer;
160 case BKTR_MEM_BUF: return memory_list[unit].buf;
161 default: printf("bktr_mem: Invalid memory type %d for bktr%d",type,unit);
166 /*************************************************************/
168 static moduledata_t bktr_mem_mod = {
173 /* The load order is First and module type is Driver to make sure bktr_mem
174 loads (and initialises) before bktr when both are loaded together */
175 DECLARE_MODULE(bktr_mem, bktr_mem_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
176 MODULE_VERSION(bktr_mem, 1);