70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
#include <sys/types.h>
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#include "go32.h"
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#include "dpmi.h"
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#include "dos.h"
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u_short _go32_my_cs()
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{
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asm("movw %cs,%ax");
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}
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u_short _go32_my_ds()
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{
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asm("movw %ds,%ax");
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}
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u_short _go32_my_ss()
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{
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asm("movw %ss,%ax");
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}
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u_short _go32_conventional_mem_selector()
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{
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return _go32_info_block.selector_for_linear_memory;
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}
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static _go32_dpmi_registers regs;
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static volatile u_long ctrl_break_count = 0;
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static int ctrl_break_hooked = 0;
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static _go32_dpmi_seginfo old_vector;
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static _go32_dpmi_seginfo new_vector;
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static ctrl_break_isr(_go32_dpmi_registers *regs)
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{
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ctrl_break_count ++;
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}
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u_long _go32_was_ctrl_break_hit()
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{
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u_long cnt;
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_go32_want_ctrl_break(1);
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cnt = ctrl_break_count;
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ctrl_break_count = 0;
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return cnt;
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}
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void _go32_want_ctrl_break(int yes)
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{
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if (yes)
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{
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if (ctrl_break_hooked)
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return;
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_go32_dpmi_get_real_mode_interrupt_vector(0x1b, &old_vector);
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new_vector.pm_offset = (int)ctrl_break_isr;
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_go32_dpmi_allocate_real_mode_callback_iret(&new_vector, ®s);
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_go32_dpmi_set_real_mode_interrupt_vector(0x1b, &new_vector);
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ctrl_break_count = 0;
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ctrl_break_hooked = 1;
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}
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else
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{
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if (!ctrl_break_hooked)
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return;
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_go32_dpmi_set_real_mode_interrupt_vector(0x1b, &old_vector);
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_go32_dpmi_free_real_mode_callback(&new_vector);
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ctrl_break_count = 0;
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ctrl_break_hooked = 0;
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}
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}
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