nuclear@1: /* TODO: try NOT using the v8086 interrupts to avoid the overhead */
nuclear@1: #include "mouse.h"
nuclear@1: #include "inttypes.h"
nuclear@1: #include "dpmi.h"
nuclear@1: 
nuclear@1: #define INTR	0x33
nuclear@1: 
nuclear@1: #define QUERY	0
nuclear@1: #define SHOW	1
nuclear@1: #define HIDE	2
nuclear@1: #define READ	3
nuclear@1: #define WRITE	4
nuclear@1: 
nuclear@1: #define XLIM	7
nuclear@1: #define YLIM	8
nuclear@1: 
nuclear@1: int have_mouse(void)
nuclear@1: {
nuclear@1: 	struct dpmi_real_regs regs;
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 	regs.eax = QUERY;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: 	return regs.eax & 0xffff;
nuclear@1: }
nuclear@1: 
nuclear@1: void show_mouse(int show)
nuclear@1: {
nuclear@1: 	struct dpmi_real_regs regs;
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 	regs.eax = show ? SHOW : HIDE;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: }
nuclear@1: 
nuclear@1: int read_mouse(int *xp, int *yp)
nuclear@1: {
nuclear@1: 	struct dpmi_real_regs regs;
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 
nuclear@1: 	regs.eax = READ;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: 
nuclear@1: 	if(xp) *xp = regs.ecx & 0xffff;
nuclear@1: 	if(yp) *yp = regs.edx & 0xffff;
nuclear@1: 	return regs.ebx & 0xffff;
nuclear@1: }
nuclear@1: 
nuclear@1: void set_mouse(int x, int y)
nuclear@1: {
nuclear@1: 	struct dpmi_real_regs regs;
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 
nuclear@1: 	regs.eax = WRITE;
nuclear@1: 	regs.ecx = x;
nuclear@1: 	regs.edx = y;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: }
nuclear@1: 
nuclear@1: void set_mouse_limits(int xmin, int ymin, int xmax, int ymax)
nuclear@1: {
nuclear@1: 	struct dpmi_real_regs regs;
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 	regs.eax = XLIM;
nuclear@1: 	regs.ecx = xmin;
nuclear@1: 	regs.edx = xmax;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: 
nuclear@1: 	memset(&regs, 0, sizeof regs);
nuclear@1: 	regs.eax = YLIM;
nuclear@1: 	regs.ecx = ymin;
nuclear@1: 	regs.edx = ymax;
nuclear@1: 	dpmi_real_int(INTR, &regs);
nuclear@1: }