1*10465441SEvalZero /*
2*10465441SEvalZero * File : trap.c
3*10465441SEvalZero * This file is part of RT-Thread RTOS
4*10465441SEvalZero * COPYRIGHT (C) 2006, RT-Thread Development Team
5*10465441SEvalZero *
6*10465441SEvalZero * The license and distribution terms for this file may be
7*10465441SEvalZero * found in the file LICENSE in this distribution or at
8*10465441SEvalZero * http://openlab.rt-thread.com/license/LICENSE
9*10465441SEvalZero *
10*10465441SEvalZero * Change Logs:
11*10465441SEvalZero * Date Author Notes
12*10465441SEvalZero */
13*10465441SEvalZero
14*10465441SEvalZero #include <rtthread.h>
15*10465441SEvalZero #include <rthw.h>
16*10465441SEvalZero
17*10465441SEvalZero #include <bsp.h>
18*10465441SEvalZero
19*10465441SEvalZero /* Interrupt descriptor table. (Must be built at run time because
20*10465441SEvalZero * shifted function addresses can't be represented in relocation records.)
21*10465441SEvalZero */
22*10465441SEvalZero struct Gatedesc idt[256] = { {0}, };
23*10465441SEvalZero struct Pseudodesc idt_pd =
24*10465441SEvalZero {
25*10465441SEvalZero 0, sizeof(idt) - 1, (unsigned long) idt,
26*10465441SEvalZero };
27*10465441SEvalZero
28*10465441SEvalZero /* exception and interrupt handler table */
29*10465441SEvalZero extern rt_isr_handler_t isr_table[];
30*10465441SEvalZero extern rt_isr_handler_t trap_func[];
31*10465441SEvalZero extern rt_isr_handler_t hdinterrupt_func[];
32*10465441SEvalZero
33*10465441SEvalZero /**
34*10465441SEvalZero * @addtogroup I386
35*10465441SEvalZero */
36*10465441SEvalZero /*@{*/
37*10465441SEvalZero
38*10465441SEvalZero /**
39*10465441SEvalZero * this function initializes the interrupt descript table
40*10465441SEvalZero *
41*10465441SEvalZero */
rt_hw_idt_init(void)42*10465441SEvalZero void rt_hw_idt_init(void)
43*10465441SEvalZero {
44*10465441SEvalZero extern void Xdefault;
45*10465441SEvalZero int i, j, func;
46*10465441SEvalZero
47*10465441SEvalZero // install a default handler
48*10465441SEvalZero for (i = 0; i < sizeof(idt)/sizeof(idt[0]); i++)
49*10465441SEvalZero SETGATE(idt[i], 0, GD_KT, &Xdefault, 0);
50*10465441SEvalZero
51*10465441SEvalZero /*install trap handler*/
52*10465441SEvalZero for(i = 0; i < 16; i++)
53*10465441SEvalZero {
54*10465441SEvalZero func = (int)trap_func[i];
55*10465441SEvalZero SETGATE(idt[i], 0, GD_KT, func, 0);
56*10465441SEvalZero }
57*10465441SEvalZero
58*10465441SEvalZero func = (int)trap_func[3];
59*10465441SEvalZero SETGATE(idt[3], 0, GD_KT, func, 3);
60*10465441SEvalZero
61*10465441SEvalZero i = 0;
62*10465441SEvalZero
63*10465441SEvalZero /*install exteral interrupt handler*/
64*10465441SEvalZero for(j = IRQ_OFFSET; j < IRQ_OFFSET + MAX_HANDLERS; j++)
65*10465441SEvalZero {
66*10465441SEvalZero func = (int)hdinterrupt_func[i];
67*10465441SEvalZero SETGATE(idt[j], 0, GD_KT, func, 0);
68*10465441SEvalZero i++;
69*10465441SEvalZero }
70*10465441SEvalZero
71*10465441SEvalZero // Load the IDT
72*10465441SEvalZero asm volatile("lidt idt_pd + 2");
73*10465441SEvalZero }
74*10465441SEvalZero
75*10465441SEvalZero /**
76*10465441SEvalZero * this function will deal with all kinds of kernel trap
77*10465441SEvalZero *
78*10465441SEvalZero *@param trapno the trap number
79*10465441SEvalZero *
80*10465441SEvalZero */
rt_hw_trap_irq(int trapno)81*10465441SEvalZero void rt_hw_trap_irq(int trapno)
82*10465441SEvalZero {
83*10465441SEvalZero switch(trapno)
84*10465441SEvalZero {
85*10465441SEvalZero case T_DIVIDE:
86*10465441SEvalZero rt_kprintf("Divide error interrupt\n");
87*10465441SEvalZero RT_ASSERT(0);
88*10465441SEvalZero case T_PGFLT:
89*10465441SEvalZero rt_kprintf("Page fault interrupt\n");
90*10465441SEvalZero RT_ASSERT(0);
91*10465441SEvalZero case T_GPFLT:
92*10465441SEvalZero rt_kprintf("General protection interrupt\n");
93*10465441SEvalZero RT_ASSERT(0);
94*10465441SEvalZero case T_DEFAULT:
95*10465441SEvalZero rt_hw_interrupt_handle(T_DEFAULT);
96*10465441SEvalZero return;
97*10465441SEvalZero }
98*10465441SEvalZero
99*10465441SEvalZero /*kernel bug if run here*/
100*10465441SEvalZero RT_ASSERT(0);
101*10465441SEvalZero }
102*10465441SEvalZero
103*10465441SEvalZero /*@}*/
104