/* * Kernel Debugger Architecture Dependent Console I/O handler * * This file is subject to the terms and conditions of the GNU General Public * License. * * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved. * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. */ #include <linux/kdb.h> #include <linux/keyboard.h> #include <linux/ctype.h> #include <linux/module.h> #include <linux/io.h> /* Keyboard Controller Registers on normal PCs. */ #define KBD_STATUS_REG 0x64 /* Status register (R) */ #define KBD_DATA_REG 0x60 /* Keyboard data register (R/W) */ /* Status Register Bits */ #define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */ #define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */ static int kbd_exists; /* * Check if the keyboard controller has a keypress for us. * Some parts (Enter Release, LED change) are still blocking polled here, * but hopefully they are all short. */ int kdb_get_kbd_char(void) { int scancode, scanstatus; static int shift_lock; /* CAPS LOCK state (0-off, 1-on) */ static int shift_key; /* Shift next keypress */ static int ctrl_key; u_short keychar; if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) || (inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) { kbd_exists = 0; return -1; } kbd_exists = 1; if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0) return -1; /* * Fetch the scancode */ scancode = inb(KBD_DATA_REG); scanstatus = inb(KBD_STATUS_REG); /* * Ignore mouse events. */ if (scanstatus & KBD_STAT_MOUSE_OBF) return -1; /* * Ignore release, trigger on make * (except for shift keys, where we want to * keep the shift state so long as the key is * held down). */ if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) { /* * Next key may use shift table */ if ((scancode & 0x80) == 0) shift_key = 1; else shift_key = 0; return -1; } if ((scancode&0x7f) == 0x1d) { /* * Left ctrl key */ if ((scancode & 0x80) == 0) ctrl_key = 1; else ctrl_key = 0; return -1; } if ((scancode & 0x80) != 0) return -1; scancode &= 0x7f; /* * Translate scancode */ if (scancode == 0x3a) { /* * Toggle caps lock */ shift_lock ^= 1; #ifdef KDB_BLINK_LED kdb_toggleled(0x4); #endif return -1; } if (scancode == 0x0e) { /* * Backspace */ return 8; } /* Special Key */ switch (scancode) { case 0xF: /* Tab */ return 9; case 0x53: /* Del */ return 4; case 0x47: /* Home */ return 1; case 0x4F: /* End */ return 5; case 0x4B: /* Left */ return 2; case 0x48: /* Up */ return 16; case 0x50: /* Down */ return 14; case 0x4D: /* Right */ return 6; } if (scancode == 0xe0) return -1; /* * For Japanese 86/106 keyboards * See comment in drivers/char/pc_keyb.c. * - Masahiro Adegawa */ if (scancode == 0x73) scancode = 0x59; else if (scancode == 0x7d) scancode = 0x7c; if (!shift_lock && !shift_key && !ctrl_key) { keychar = plain_map[scancode]; } else if ((shift_lock || shift_key) && key_maps[1]) { keychar = key_maps[1][scancode]; } else if (ctrl_key && key_maps[4]) { keychar = key_maps[4][scancode]; } else { keychar = 0x0020; kdb_printf("Unknown state/scancode (%d)\n", scancode); } keychar &= 0x0fff; if (keychar == '\t') keychar = ' '; switch (KTYP(keychar)) { case KT_LETTER: case KT_LATIN: if (isprint(keychar)) break; /* printable characters */ /* drop through */ case KT_SPEC: if (keychar == K_ENTER) break; /* drop through */ default: return -1; /* ignore unprintables */ } if ((scancode & 0x7f) == 0x1c) { /* * enter key. All done. Absorb the release scancode. */ while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0) ; /* * Fetch the scancode */ scancode = inb(KBD_DATA_REG); scanstatus = inb(KBD_STATUS_REG); while (scanstatus & KBD_STAT_MOUSE_OBF) { scancode = inb(KBD_DATA_REG); scanstatus = inb(KBD_STATUS_REG); } if (scancode != 0x9c) { /* * Wasn't an enter-release, why not? */ kdb_printf("kdb: expected enter got 0x%x status 0x%x\n", scancode, scanstatus); } return 13; } return keychar & 0xff; } EXPORT_SYMBOL_GPL(kdb_get_kbd_char);