diff options
Diffstat (limited to 'ps2.h')
| -rw-r--r-- | ps2.h | 124 |
1 files changed, 124 insertions, 0 deletions
@@ -0,0 +1,124 @@ +/* + * 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 PS2_H +#define PS2_H + +#include <stdbool.h> +#include <stdint.h> + +enum { + 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, +}; + +#pragma aux PS2_CB far loadds parm reverse caller [] +// TODO: ax and es look not be preserved with this. VBox BIOS already preserves them though. + +/** Invoked by the BIOS when there is a mouse event. + * @param status combination of PS2M_STATUS_* flags */ +typedef void (__far * LPFN_PS2CALLBACK)(uint8_t status, uint8_t x, uint8_t y, uint8_t z); + +static inline void cli(void); +#pragma aux cli = "cli" + +static inline void sti(void); +#pragma aux sti = "sti" + +static uint8_t ps2_init(void); +#pragma aux ps2_init = \ + "stc" /* If nothing happens, assume failure */ \ + "mov ax, 0xC205" /* Pointing device: initialization */ \ + "mov bh, 3" /* Use 3 byte packets */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ax, 0xC201" /* Pointing device: reset */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ax, 0xC203" /* Pointing device: set resolution */ \ + "mov bh, 3" /* 3 count per mm = ~ 200 ppi */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ax, 0xC202" /* Pointing device: set sample rate*/ \ + "mov bh, 5" /* 2: 40 samples per second */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ax, 0xC206" /* Pointing device: extended commands */ \ + "mov bh, 1" /* Set 1:1 scaling */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ah, 0" /* Success */ \ + "jmp end" \ + \ + "fail: test ah, ah" /* Ensure we have some error code back, set ah to ff if we don't */ \ + "jnz end" \ + "mov ah, 0xFF" \ + "end:" \ + __value [ah] \ + __modify [ax] + +static uint8_t ps2_set_callback(LPFN_PS2CALLBACK callback); +#pragma aux ps2_set_callback = \ + "stc" /* If nothing happens, assume failure */ \ + "mov ax, 0xC207" /* Pointing device: set interrupt callback (in es:bx) */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ah, 0" /* Success */ \ + "jmp end" \ + \ + "fail: test ah, ah" /* Ensure we have some error code back */ \ + "jnz end" \ + "mov ah, 0xFF" \ + "end:" \ + __parm [es bx] \ + __value [ah] \ + __modify [ax] + +static uint8_t ps2_enable(bool enable); +#pragma aux ps2_enable = \ + "test bh, bh" /* Ensure enable is either 1 or 0 */ \ + "setnz bh" \ + "stc" /* If nothing happens, assume failure */ \ + "mov ax, 0xC200" /* Pointing device enable/disable (in bh) */ \ + "int 0x15" \ + "jc fail" \ + \ + "mov ah, 0" /* Success */ \ + "jmp end" \ + \ + "fail: test ah, ah" /* Ensure we have some error code back */ \ + "jnz end" \ + "mov ah, 0xFF" \ + "end:" \ + __parm [bh] \ + __value [ah] \ + __modify [ax] + +#endif |