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/*
* VBMouse - Routines to access the PS2 BIOS services
* Copyright (C) 2022 Javier S. Pedro
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef INT15PS2_H
#define INT15PS2_H
#include <stdbool.h>
#include <stdint.h>
/** Standard PS/2 mouse IRQ. At least on VirtualBox. */
#define PS2_MOUSE_IRQ 12
/** The corresponding interrupt vector for IRQ 12. */
#define PS2_MOUSE_INT_VECTOR 0x74
typedef uint8_t ps2m_err;
enum ps2m_errors {
PS2M_ERR_INVALID_FUNCTION = 1,
PSM2_ERR_INVALID_INPUT = 2,
PSM2_ERR_INTERFACE_ERROR = 3,
PSM2_ERR_RESEND = 4,
PSM2_ERR_NO_CALLBACK = 5,
};
enum ps2m_status {
PS2M_STATUS_BUTTON_1 = 1 << 0,
PS2M_STATUS_BUTTON_2 = 1 << 1,
PS2M_STATUS_BUTTON_3 = 1 << 2,
PS2M_STATUS_X_NEG = 1 << 4,
PS2M_STATUS_Y_NEG = 1 << 5,
PS2M_STATUS_X_OVF = 1 << 6,
PS2M_STATUS_Y_OVF = 1 << 7,
};
enum ps2m_packet_size {
PS2M_PACKET_SIZE_PLAIN = 3,
PS2M_PACKET_SIZE_EXT = 4,
};
enum ps2m_device_ids {
/** Standard PS/2 mouse, 2 buttons. */
PS2M_DEVICE_ID_PLAIN = 0,
/** IntelliMouse PS/2, with wheel. */
PS2M_DEVICE_ID_IMPS2 = 3,
/** IntelliMouse Explorer, wheel and 5 buttons. */
PS2M_DEVICE_ID_IMEX = 4,
/** IntelliMouse Explorer, wheel, 5 buttons, and horizontal scrolling. */
PS2M_DEVICE_ID_IMEX_HORZ = 5
};
enum ps2m_resolution {
PS2M_RESOLUTION_25 = 0,
PS2M_RESOLUTION_50 = 1,
PS2M_RESOLUTION_100 = 2,
PS2M_RESOLUTION_200 = 3
};
enum ps2m_sample_rate {
PS2M_SAMPLE_RATE_10 = 0,
PS2M_SAMPLE_RATE_20 = 1,
PS2M_SAMPLE_RATE_40 = 2,
PS2M_SAMPLE_RATE_60 = 3,
PS2M_SAMPLE_RATE_80 = 4,
PS2M_SAMPLE_RATE_100 = 5,
PS2M_SAMPLE_RATE_200 = 6
};
/** Invoked by the BIOS when there is a mouse event. */
typedef void (__far * LPFN_PS2CALLBACK)();
static ps2m_err ps2m_init(uint8_t packet_size);
#pragma aux ps2m_init = \
"stc" /* If nothing happens, assume failure */ \
"mov ax, 0xC205" /* Pointing device: initialization (packet size in bh) */ \
"int 0x15" \
"jnc end" /* Success */ \
"fail: test ah, ah" /* Ensure we have some error code back, set ah to -1 if we don't */ \
"jnz end" \
"dec ah" \
"end:" \
__parm [bh] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_reset(void);
#pragma aux ps2m_reset = \
"stc" \
"mov ax, 0xC201" /* Pointing device: reset */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_get_device_id(uint8_t __far *device_id);
#pragma aux ps2m_get_device_id = \
"stc" \
"mov ax, 0xC204" /* Pointing device: get device ID */ \
"int 0x15" \
"mov es:[di], bh" /* Save returned value */ \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [es di] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_set_resolution(uint8_t resolution);
#pragma aux ps2m_set_resolution = \
"stc" \
"mov ax, 0xC203" /* Pointing device: set resolution (in bh) */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [bh] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_set_sample_rate(uint8_t sample_rate);
#pragma aux ps2m_set_sample_rate = \
"stc" \
"mov ax, 0xC202" /* Pointing device: set sample rate (in bh) */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [bh] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_set_scaling_factor(uint8_t scaling_factor);
#pragma aux ps2m_set_scaling_factor = \
"stc" \
"mov ax, 0xC206" /* Pointing device: extended commands (with bh > 0, set scaling factor) */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [bh] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_set_callback(LPFN_PS2CALLBACK callback);
#pragma aux ps2m_set_callback = \
"stc" \
"mov ax, 0xC207" /* Pointing device: set interrupt callback (in es:bx) */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [es bx] \
__value [ah] \
__modify [ax]
static ps2m_err ps2m_enable(bool enable);
#pragma aux ps2m_enable = \
"test bh, bh" /* Ensure enable is either 1 or 0 */ \
"setnz bh" \
"stc" \
"mov ax, 0xC200" /* Pointing device enable/disable (in bh) */ \
"int 0x15" \
"jnc end" \
"fail: test ah, ah" \
"jnz end" \
"dec ah" \
"end:" \
__parm [bh] \
__value [ah] \
__modify [ax]
static void ps2m_send_imps2_sequence(void)
{
ps2m_set_sample_rate(PS2M_SAMPLE_RATE_200);
ps2m_set_sample_rate(PS2M_SAMPLE_RATE_100);
ps2m_set_sample_rate(PS2M_SAMPLE_RATE_80);
}
static bool ps2m_detect_wheel(void)
{
int err;
uint8_t device_id;
// Switch to the 4-byte packet and reset the mouse.
// We are not supposed to receive messages at this time anyway.
err = ps2m_init(PS2M_PACKET_SIZE_EXT);
if (err) {
return false;
}
// Get the initial mouse device id
err = ps2m_get_device_id(&device_id);
if (err || device_id != 0) {
// TODO : Likely have to accept more device_ids here.
return false;
}
// Send the knock sequence to activate the extended packet
ps2m_send_imps2_sequence();
// Now check if the device id has changed
err = ps2m_get_device_id(&device_id);
return err == 0 && device_id == PS2M_DEVICE_ID_IMPS2;
}
#endif /* INT15PS2_H */
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