mouse.h

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#ifndef MOUSE_HPP
#define MOUSE_HPP
 
#include <types.h>
#include <errno.h>
 
#define HW_EQUIP_PS2 4
#define MOUSE_PKT_BYTES 3
#define MOUSE_RESOLUTION 3
 
typedef enum {NothingPress = 8, LeftPress = 9, RightPress = 10} MouseStatus;
 
struct Mouse {
    short x, y, status;
} mouse;
 
void mouseHandler() {
    char dx, dy;
    asm("pushw ds\n"
        "pushw cs\n"
        "popw ds\n");
 
    asm("mov ax, [ebp+10]\n"
        "mov bx, [ebp+12]\n"
        "mov cx, [ebp+14]":"=a"(dy), "=b"(dx), "=c"(mouse.status));
    mouse.x += dx;
    mouse.y -= dy;
 
    asm("popw ds\n"
        "leave\n"
        "retfw");
}
 
void mouseDisable() {
    asm("int 0x15\n"::"a"(0xc200), "b"(0));//Disable
 
    //clear callback function
    asm("pushw es\n"
        "mov es, bx\n"
        "int 0x15\n"
        "popw es"::"a"(0xc207), "b"(0x0000));
}
 
void mouseEnable() {
    mouseDisable();
 
    //set callback function
    asm("pushw es\n"
        "pushw cs\n"
        "popw es\n"
        "int 0x15\n"
        "popw es"::"a"(0xc207), "b"(mouseHandler));
    asm("int 0x15\n"::"a"(0xc200), "b"(0x100));//Enable
}
 
int mouseInitialize() {
    short installedDevices;
    asm("int 0x11":"=a"(installedDevices));
    if((installedDevices & HW_EQUIP_PS2) == 0)
        return -ENODEV;
 
    asm("int 0x15\n"
        "jnc exit%=\n"
        "mov ax, -1\n"
        "exit%=:\n"
        :"=a"(installedDevices):"a"(0xc205), "b"(MOUSE_PKT_BYTES<<8));
    if(installedDevices < 0)
        return -ENODEV;
 
    asm("int 0x15\n"
        "jnc exit%=\n"
        "mov ax, -1\n"
        "exit%=:\n"
        :"=a"(installedDevices):"a"(0xc203), "b"(MOUSE_RESOLUTION<<8));
    if(installedDevices < 0)
        return -ENODEV;
 
    mouseEnable();
    return 0;
}
 
#endif //MOUSE_HPP