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setgate.c
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setgate.c
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#include "setgate.h"
/*
set_intr_gate
Description: set idt[n] to intr gate and attach handler at
addr to idt[n]
Input: handler function at addr, index number n
Output: none
*/
void set_intr_gate(int n, void* addr)
{
idt[n].seg_selector = 0x10;
idt[n].reserved4 = 0;
idt[n].reserved3 = 0;
idt[n].reserved2 = 1;
idt[n].reserved1 = 1;
idt[n].size = 1;
idt[n].reserved0 = 0;
idt[n].dpl = 0;
idt[n].present = 1;
SET_IDT_ENTRY(idt[n], addr);
}
/*
set_system_gate
Description: set idt[n] to system gate and attach handler at
addr to idt[n]
Input: handler function at addr, index number n
Output: none
*/
void set_system_gate(int n, void* addr)
{
idt[n].seg_selector = 0x10;
idt[n].reserved4 = 0;
idt[n].reserved3 = 1;
idt[n].reserved2 = 1;
idt[n].reserved1 = 1;
idt[n].size = 1;
idt[n].reserved0 = 0;
idt[n].dpl = 3;
idt[n].present = 1;
SET_IDT_ENTRY(idt[n], addr);
}
/*
set_system_intr_gate
Description: set idt[n] to system_intr gate and attach handler at
addr to idt[n]
Input: handler function at addr, index number n
Output: none
*/
void set_system_intr_gate(int n, void* addr)
{
idt[n].seg_selector = 0x10;
idt[n].reserved4 = 0;
idt[n].reserved3 = 0;
idt[n].reserved2 = 1;
idt[n].reserved1 = 1;
idt[n].size = 1;
idt[n].reserved0 = 0;
idt[n].dpl = 3;
idt[n].present = 1;
SET_IDT_ENTRY(idt[n], addr);
}
/*
set_trap_gate
Description: set idt[n] to trap gate and attach handler at
addr to idt[n]
Input: handler function at addr, index number n
Output: none
*/
void set_trap_gate(int n, void* addr)
{
idt[n].seg_selector = 0x10;
idt[n].reserved4 = 0;
idt[n].reserved3 = 1;
idt[n].reserved2 = 1;
idt[n].reserved1 = 1;
idt[n].size = 1;
idt[n].reserved0 = 0;
idt[n].dpl = 0;
idt[n].present = 1;
SET_IDT_ENTRY(idt[n], addr);
}
/*
set_task_gate
Description: set idt[n] to task gate and attach handler at
addr to idt[n]
Input: handler function at addr, index number n
Output: none
*/
void set_task_gate(int n, void* addr)
{
idt[n].seg_selector = 0x10;
idt[n].reserved4 = 0;
idt[n].reserved3 = 1;
idt[n].reserved2 = 0;
idt[n].reserved1 = 1;
idt[n].size = 0;
idt[n].reserved0 = 0;
idt[n].dpl = 3;
idt[n].present = 1;
SET_IDT_ENTRY(idt[n], addr);
}