?? i8259.c
字號:
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
i8259.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#include "type.h"
#include "const.h"
#include "protect.h"
#include "string.h"
#include "proc.h"
#include "tty.h"
#include "console.h"
#include "global.h"
#include "proto.h"
/*======================================================================*
init_8259A
*======================================================================*/
PUBLIC void init_8259A()
{
out_byte(INT_M_CTL, 0x11); // Master 8259, ICW1.
out_byte(INT_S_CTL, 0x11); // Slave 8259, ICW1.
out_byte(INT_M_CTLMASK, INT_VECTOR_IRQ0); // Master 8259, ICW2. 設置 '主8259' 的中斷入口地址為 0x20.
out_byte(INT_S_CTLMASK, INT_VECTOR_IRQ8); // Slave 8259, ICW2. 設置 '從8259' 的中斷入口地址為 0x28
out_byte(INT_M_CTLMASK, 0x4); // Master 8259, ICW3. IR2 對應 '從8259'.
out_byte(INT_S_CTLMASK, 0x2); // Slave 8259, ICW3. 對應 '主8259' 的 IR2.
out_byte(INT_M_CTLMASK, 0x1); // Master 8259, ICW4.
out_byte(INT_S_CTLMASK, 0x1); // Slave 8259, ICW4.
out_byte(INT_M_CTLMASK, 0xFF); // Master 8259, OCW1.
out_byte(INT_S_CTLMASK, 0xFF); // Slave 8259, OCW1.
int i;
for(i=0;i<NR_IRQ;i++){
irq_table[i] = spurious_irq;
}
}
/*======================================================================*
put_irq_handler
*======================================================================*/
PUBLIC void put_irq_handler(int irq, t_pf_irq_handler handler)
{
disable_irq(irq);
irq_table[irq] = handler;
}
/*======================================================================*
spurious_irq
*======================================================================*/
PUBLIC void spurious_irq(int irq)
{
disp_str("spurious_irq: ");
disp_int(irq);
disp_str("\n");
}
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