1 files changed, 212 insertions, 0 deletions

diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
new file mode 100644
index 000000000000..4bca634975c0
--- /dev/null
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -0,0 +1,212 @@
+/*
+ * 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);