1 /*
2 * Copyright (c) 2011 Aeroflex Gaisler
3 *
4 * BSD license:
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25
26 #include <asm-leon/leonstack.h>
27 #include <asm-leon/irq.h>
28 #define NULL 0
29
30 /* single vector trapping version of trap handler installs */
31 struct svt_trap_entry
32 {
33 int start, end, func;
34 };
35 extern struct svt_trap_entry trap_table[28];
36 extern struct svt_trap_entry svt_trap_table_ext[17];
37 extern struct svt_trap_entry svt_trap_table_ext_end;
38
39 static struct svt_trap_entry *
gettrap_pos(int nr)40 gettrap_pos (int nr)
41 {
42 struct svt_trap_entry *p = trap_table;
43 while ((p->start) || (p->end) || (p->func))
44 {
45 if (p->start <= nr && p->end >= nr)
46 {
47 break;
48 }
49 p++;
50 }
51 return p;
52 }
53
54 int
svtloleveltrapinstall(int trap,void (* handler)())55 svtloleveltrapinstall (int trap, void (*handler) ())
56 {
57 struct svt_trap_entry *p = gettrap_pos (trap);
58 if (p >= &svt_trap_table_ext_end)
59 {
60 return 0;
61 }
62 p->start = trap;
63 p->end = trap;
64 p->func = handler;
65 return 1;
66 }
67
68 int
svtlolevelirqinstall(int irqnr,void (* handler)())69 svtlolevelirqinstall (int irqnr, void (*handler) ())
70 {
71 if (irqnr == 0 || irqnr >= 15)
72 {
73 return 0;
74 }
75 return svtloleveltrapinstall (irqnr + 0x10, handler);
76 }
77