grub2/0023-at_keyboard-Split-protocol-from-controller-code.patch

From 216950a4eea1a1ead1c28eaca94e34ea2ef2ad19 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Mon, 8 May 2017 21:41:22 +0200
Subject: [PATCH 023/250] at_keyboard: Split protocol from controller code.

On vexpress controller is different but protocol is the same, so reuse the
code.
---
 grub-core/Makefile.core.def  |   3 +
 grub-core/term/at_keyboard.c | 428 +++----------------------------------------
 grub-core/term/ps2.c         | 387 ++++++++++++++++++++++++++++++++++++++
 include/grub/at_keyboard.h   |   4 -
 include/grub/ps2.h           |  43 +++++
 5 files changed, 463 insertions(+), 402 deletions(-)
 create mode 100644 grub-core/term/ps2.c
 create mode 100644 include/grub/ps2.h

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 77d0b019eb2..6ade6e95057 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -251,6 +251,7 @@ kernel = {
   mips_qemu_mips = term/ns8250.c;
   mips_qemu_mips = term/serial.c;
   mips_qemu_mips = term/at_keyboard.c;
+  mips_qemu_mips = term/ps2.c;
   mips_qemu_mips = commands/boot.c;
   mips_qemu_mips = commands/keylayouts.c;
   mips_qemu_mips = term/i386/pc/vga_text.c;
@@ -266,6 +267,7 @@ kernel = {
   mips_loongson = bus/pci.c;
   mips_loongson = kern/mips/loongson/init.c;
   mips_loongson = term/at_keyboard.c;
+  mips_loongson = term/ps2.c;
   mips_loongson = commands/boot.c;
   mips_loongson = term/serial.c;
   mips_loongson = video/sm712.c;
@@ -1887,6 +1889,7 @@ module = {
 module = {
   name = at_keyboard;
   common = term/at_keyboard.c;
+  common = term/ps2.c;
   enable = x86;
 };
 
diff --git a/grub-core/term/at_keyboard.c b/grub-core/term/at_keyboard.c
index b4ea9ff7e63..3ab4e205f40 100644
--- a/grub-core/term/at_keyboard.c
+++ b/grub-core/term/at_keyboard.c
@@ -22,212 +22,21 @@
 #include <grub/cpu/io.h>
 #include <grub/misc.h>
 #include <grub/term.h>
-#include <grub/keyboard_layouts.h>
 #include <grub/time.h>
 #include <grub/loader.h>
+#include <grub/ps2.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
-static short at_keyboard_status = 0;
-static int e0_received = 0;
-static int f0_received = 0;
-
-static grub_uint8_t led_status;
-
-#define KEYBOARD_LED_SCROLL		(1 << 0)
-#define KEYBOARD_LED_NUM		(1 << 1)
-#define KEYBOARD_LED_CAPS		(1 << 2)
-
 static grub_uint8_t grub_keyboard_controller_orig;
 static grub_uint8_t grub_keyboard_orig_set;
-static grub_uint8_t current_set; 
-
-static void
-grub_keyboard_controller_init (void);
-
-static const grub_uint8_t set1_mapping[128] =
-  {
-    /* 0x00 */ 0 /* Unused  */,               GRUB_KEYBOARD_KEY_ESCAPE, 
-    /* 0x02 */ GRUB_KEYBOARD_KEY_1,           GRUB_KEYBOARD_KEY_2, 
-    /* 0x04 */ GRUB_KEYBOARD_KEY_3,           GRUB_KEYBOARD_KEY_4, 
-    /* 0x06 */ GRUB_KEYBOARD_KEY_5,           GRUB_KEYBOARD_KEY_6, 
-    /* 0x08 */ GRUB_KEYBOARD_KEY_7,           GRUB_KEYBOARD_KEY_8, 
-    /* 0x0a */ GRUB_KEYBOARD_KEY_9,           GRUB_KEYBOARD_KEY_0, 
-    /* 0x0c */ GRUB_KEYBOARD_KEY_DASH,        GRUB_KEYBOARD_KEY_EQUAL, 
-    /* 0x0e */ GRUB_KEYBOARD_KEY_BACKSPACE,   GRUB_KEYBOARD_KEY_TAB, 
-    /* 0x10 */ GRUB_KEYBOARD_KEY_Q,           GRUB_KEYBOARD_KEY_W, 
-    /* 0x12 */ GRUB_KEYBOARD_KEY_E,           GRUB_KEYBOARD_KEY_R, 
-    /* 0x14 */ GRUB_KEYBOARD_KEY_T,           GRUB_KEYBOARD_KEY_Y, 
-    /* 0x16 */ GRUB_KEYBOARD_KEY_U,           GRUB_KEYBOARD_KEY_I, 
-    /* 0x18 */ GRUB_KEYBOARD_KEY_O,           GRUB_KEYBOARD_KEY_P, 
-    /* 0x1a */ GRUB_KEYBOARD_KEY_LBRACKET,    GRUB_KEYBOARD_KEY_RBRACKET, 
-    /* 0x1c */ GRUB_KEYBOARD_KEY_ENTER,       GRUB_KEYBOARD_KEY_LEFT_CTRL, 
-    /* 0x1e */ GRUB_KEYBOARD_KEY_A,           GRUB_KEYBOARD_KEY_S, 
-    /* 0x20 */ GRUB_KEYBOARD_KEY_D,           GRUB_KEYBOARD_KEY_F, 
-    /* 0x22 */ GRUB_KEYBOARD_KEY_G,           GRUB_KEYBOARD_KEY_H, 
-    /* 0x24 */ GRUB_KEYBOARD_KEY_J,           GRUB_KEYBOARD_KEY_K, 
-    /* 0x26 */ GRUB_KEYBOARD_KEY_L,           GRUB_KEYBOARD_KEY_SEMICOLON, 
-    /* 0x28 */ GRUB_KEYBOARD_KEY_DQUOTE,      GRUB_KEYBOARD_KEY_RQUOTE, 
-    /* 0x2a */ GRUB_KEYBOARD_KEY_LEFT_SHIFT,  GRUB_KEYBOARD_KEY_BACKSLASH, 
-    /* 0x2c */ GRUB_KEYBOARD_KEY_Z,           GRUB_KEYBOARD_KEY_X, 
-    /* 0x2e */ GRUB_KEYBOARD_KEY_C,           GRUB_KEYBOARD_KEY_V, 
-    /* 0x30 */ GRUB_KEYBOARD_KEY_B,           GRUB_KEYBOARD_KEY_N, 
-    /* 0x32 */ GRUB_KEYBOARD_KEY_M,           GRUB_KEYBOARD_KEY_COMMA, 
-    /* 0x34 */ GRUB_KEYBOARD_KEY_DOT,         GRUB_KEYBOARD_KEY_SLASH, 
-    /* 0x36 */ GRUB_KEYBOARD_KEY_RIGHT_SHIFT, GRUB_KEYBOARD_KEY_NUMMUL, 
-    /* 0x38 */ GRUB_KEYBOARD_KEY_LEFT_ALT,    GRUB_KEYBOARD_KEY_SPACE, 
-    /* 0x3a */ GRUB_KEYBOARD_KEY_CAPS_LOCK,   GRUB_KEYBOARD_KEY_F1, 
-    /* 0x3c */ GRUB_KEYBOARD_KEY_F2,          GRUB_KEYBOARD_KEY_F3, 
-    /* 0x3e */ GRUB_KEYBOARD_KEY_F4,          GRUB_KEYBOARD_KEY_F5, 
-    /* 0x40 */ GRUB_KEYBOARD_KEY_F6,          GRUB_KEYBOARD_KEY_F7, 
-    /* 0x42 */ GRUB_KEYBOARD_KEY_F8,          GRUB_KEYBOARD_KEY_F9, 
-    /* 0x44 */ GRUB_KEYBOARD_KEY_F10,         GRUB_KEYBOARD_KEY_NUM_LOCK, 
-    /* 0x46 */ GRUB_KEYBOARD_KEY_SCROLL_LOCK, GRUB_KEYBOARD_KEY_NUM7, 
-    /* 0x48 */ GRUB_KEYBOARD_KEY_NUM8,        GRUB_KEYBOARD_KEY_NUM9, 
-    /* 0x4a */ GRUB_KEYBOARD_KEY_NUMMINUS,    GRUB_KEYBOARD_KEY_NUM4, 
-    /* 0x4c */ GRUB_KEYBOARD_KEY_NUM5,        GRUB_KEYBOARD_KEY_NUM6, 
-    /* 0x4e */ GRUB_KEYBOARD_KEY_NUMPLUS,     GRUB_KEYBOARD_KEY_NUM1, 
-    /* 0x50 */ GRUB_KEYBOARD_KEY_NUM2,        GRUB_KEYBOARD_KEY_NUM3, 
-    /* 0x52 */ GRUB_KEYBOARD_KEY_NUM0,        GRUB_KEYBOARD_KEY_NUMDOT, 
-    /* 0x54 */ 0,                             0, 
-    /* 0x56 */ GRUB_KEYBOARD_KEY_102ND,       GRUB_KEYBOARD_KEY_F11, 
-    /* 0x58 */ GRUB_KEYBOARD_KEY_F12,         0,
-    /* 0x5a */ 0,                             0,
-    /* 0x5c */ 0,                             0,
-    /* 0x5e */ 0,                             0,
-    /* 0x60 */ 0,                             0,
-    /* 0x62 */ 0,                             0,
-    /* OLPC keys. Just mapped to normal keys.  */
-    /* 0x64 */ 0,                             GRUB_KEYBOARD_KEY_UP,
-    /* 0x66 */ GRUB_KEYBOARD_KEY_DOWN,        GRUB_KEYBOARD_KEY_LEFT,
-    /* 0x68 */ GRUB_KEYBOARD_KEY_RIGHT,       0,
-    /* 0x6a */ 0,                             0,
-    /* 0x6c */ 0,                             0,
-    /* 0x6e */ 0,                             0,
-    /* 0x70 */ 0,                             0,
-    /* 0x72 */ 0,                             GRUB_KEYBOARD_KEY_JP_RO,
-    /* 0x74 */ 0,                             0,
-    /* 0x76 */ 0,                             0,
-    /* 0x78 */ 0,                             0,
-    /* 0x7a */ 0,                             0,
-    /* 0x7c */ 0,                             GRUB_KEYBOARD_KEY_JP_YEN,
-    /* 0x7e */ GRUB_KEYBOARD_KEY_KPCOMMA
-  };
-
-static const struct
-{
-  grub_uint8_t from, to;
-} set1_e0_mapping[] = 
-  {
-    {0x1c, GRUB_KEYBOARD_KEY_NUMENTER},
-    {0x1d, GRUB_KEYBOARD_KEY_RIGHT_CTRL},
-    {0x35, GRUB_KEYBOARD_KEY_NUMSLASH }, 
-    {0x38, GRUB_KEYBOARD_KEY_RIGHT_ALT},
-    {0x47, GRUB_KEYBOARD_KEY_HOME}, 
-    {0x48, GRUB_KEYBOARD_KEY_UP},
-    {0x49, GRUB_KEYBOARD_KEY_PPAGE}, 
-    {0x4b, GRUB_KEYBOARD_KEY_LEFT},
-    {0x4d, GRUB_KEYBOARD_KEY_RIGHT},
-    {0x4f, GRUB_KEYBOARD_KEY_END}, 
-    {0x50, GRUB_KEYBOARD_KEY_DOWN},
-    {0x51, GRUB_KEYBOARD_KEY_NPAGE},
-    {0x52, GRUB_KEYBOARD_KEY_INSERT},
-    {0x53, GRUB_KEYBOARD_KEY_DELETE}, 
-  };
-
-static const grub_uint8_t set2_mapping[256] =
-  {
-    /* 0x00 */ 0,                             GRUB_KEYBOARD_KEY_F9,
-    /* 0x02 */ 0,                             GRUB_KEYBOARD_KEY_F5,
-    /* 0x04 */ GRUB_KEYBOARD_KEY_F3,          GRUB_KEYBOARD_KEY_F1,
-    /* 0x06 */ GRUB_KEYBOARD_KEY_F2,          GRUB_KEYBOARD_KEY_F12,
-    /* 0x08 */ 0,                             GRUB_KEYBOARD_KEY_F10,
-    /* 0x0a */ GRUB_KEYBOARD_KEY_F8,          GRUB_KEYBOARD_KEY_F6,
-    /* 0x0c */ GRUB_KEYBOARD_KEY_F4,          GRUB_KEYBOARD_KEY_TAB,
-    /* 0x0e */ GRUB_KEYBOARD_KEY_RQUOTE,      0,
-    /* 0x10 */ 0,                             GRUB_KEYBOARD_KEY_LEFT_ALT,
-    /* 0x12 */ GRUB_KEYBOARD_KEY_LEFT_SHIFT,  0,
-    /* 0x14 */ GRUB_KEYBOARD_KEY_LEFT_CTRL,   GRUB_KEYBOARD_KEY_Q,
-    /* 0x16 */ GRUB_KEYBOARD_KEY_1,           0,
-    /* 0x18 */ 0,                             0,
-    /* 0x1a */ GRUB_KEYBOARD_KEY_Z,           GRUB_KEYBOARD_KEY_S,
-    /* 0x1c */ GRUB_KEYBOARD_KEY_A,           GRUB_KEYBOARD_KEY_W,
-    /* 0x1e */ GRUB_KEYBOARD_KEY_2,           0,
-    /* 0x20 */ 0,                             GRUB_KEYBOARD_KEY_C,
-    /* 0x22 */ GRUB_KEYBOARD_KEY_X,           GRUB_KEYBOARD_KEY_D,
-    /* 0x24 */ GRUB_KEYBOARD_KEY_E,           GRUB_KEYBOARD_KEY_4,
-    /* 0x26 */ GRUB_KEYBOARD_KEY_3,           0,
-    /* 0x28 */ 0,                             GRUB_KEYBOARD_KEY_SPACE,
-    /* 0x2a */ GRUB_KEYBOARD_KEY_V,           GRUB_KEYBOARD_KEY_F,
-    /* 0x2c */ GRUB_KEYBOARD_KEY_T,           GRUB_KEYBOARD_KEY_R,
-    /* 0x2e */ GRUB_KEYBOARD_KEY_5,           0,
-    /* 0x30 */ 0,                             GRUB_KEYBOARD_KEY_N,
-    /* 0x32 */ GRUB_KEYBOARD_KEY_B,           GRUB_KEYBOARD_KEY_H,
-    /* 0x34 */ GRUB_KEYBOARD_KEY_G,           GRUB_KEYBOARD_KEY_Y,
-    /* 0x36 */ GRUB_KEYBOARD_KEY_6,           0,
-    /* 0x38 */ 0,                             0,
-    /* 0x3a */ GRUB_KEYBOARD_KEY_M,           GRUB_KEYBOARD_KEY_J,
-    /* 0x3c */ GRUB_KEYBOARD_KEY_U,           GRUB_KEYBOARD_KEY_7,
-    /* 0x3e */ GRUB_KEYBOARD_KEY_8,           0,
-    /* 0x40 */ 0,                             GRUB_KEYBOARD_KEY_COMMA,
-    /* 0x42 */ GRUB_KEYBOARD_KEY_K,           GRUB_KEYBOARD_KEY_I,
-    /* 0x44 */ GRUB_KEYBOARD_KEY_O,           GRUB_KEYBOARD_KEY_0,
-    /* 0x46 */ GRUB_KEYBOARD_KEY_9,           0,
-    /* 0x48 */ 0,                             GRUB_KEYBOARD_KEY_DOT,
-    /* 0x4a */ GRUB_KEYBOARD_KEY_SLASH,       GRUB_KEYBOARD_KEY_L,
-    /* 0x4c */ GRUB_KEYBOARD_KEY_SEMICOLON,   GRUB_KEYBOARD_KEY_P,
-    /* 0x4e */ GRUB_KEYBOARD_KEY_DASH,        0,
-    /* 0x50 */ 0,                             GRUB_KEYBOARD_KEY_JP_RO,
-    /* 0x52 */ GRUB_KEYBOARD_KEY_DQUOTE,      0,
-    /* 0x54 */ GRUB_KEYBOARD_KEY_LBRACKET,    GRUB_KEYBOARD_KEY_EQUAL,
-    /* 0x56 */ 0,                             0,
-    /* 0x58 */ GRUB_KEYBOARD_KEY_CAPS_LOCK,   GRUB_KEYBOARD_KEY_RIGHT_SHIFT,
-    /* 0x5a */ GRUB_KEYBOARD_KEY_ENTER,       GRUB_KEYBOARD_KEY_RBRACKET,
-    /* 0x5c */ 0,                             GRUB_KEYBOARD_KEY_BACKSLASH,
-    /* 0x5e */ 0,                             0,
-    /* 0x60 */ 0,                             GRUB_KEYBOARD_KEY_102ND,
-    /* 0x62 */ 0,                             0,
-    /* 0x64 */ 0,                             0,
-    /* 0x66 */ GRUB_KEYBOARD_KEY_BACKSPACE,   0,
-    /* 0x68 */ 0,                             GRUB_KEYBOARD_KEY_NUM1,
-    /* 0x6a */ GRUB_KEYBOARD_KEY_JP_YEN,      GRUB_KEYBOARD_KEY_NUM4,
-    /* 0x6c */ GRUB_KEYBOARD_KEY_NUM7,        GRUB_KEYBOARD_KEY_KPCOMMA,
-    /* 0x6e */ 0,                             0,
-    /* 0x70 */ GRUB_KEYBOARD_KEY_NUM0,        GRUB_KEYBOARD_KEY_NUMDOT,
-    /* 0x72 */ GRUB_KEYBOARD_KEY_NUM2,        GRUB_KEYBOARD_KEY_NUM5,
-    /* 0x74 */ GRUB_KEYBOARD_KEY_NUM6,        GRUB_KEYBOARD_KEY_NUM8,
-    /* 0x76 */ GRUB_KEYBOARD_KEY_ESCAPE,      GRUB_KEYBOARD_KEY_NUM_LOCK,
-    /* 0x78 */ GRUB_KEYBOARD_KEY_F11,         GRUB_KEYBOARD_KEY_NUMPLUS,
-    /* 0x7a */ GRUB_KEYBOARD_KEY_NUM3,        GRUB_KEYBOARD_KEY_NUMMINUS,
-    /* 0x7c */ GRUB_KEYBOARD_KEY_NUMMUL,      GRUB_KEYBOARD_KEY_NUM9,
-    /* 0x7e */ GRUB_KEYBOARD_KEY_SCROLL_LOCK, 0,
-    /* 0x80 */ 0,                             0, 
-    /* 0x82 */ 0,                             GRUB_KEYBOARD_KEY_F7,
-  };
-
-static const struct
-{
-  grub_uint8_t from, to;
-} set2_e0_mapping[] = 
-  {
-    {0x11, GRUB_KEYBOARD_KEY_RIGHT_ALT},
-    {0x14, GRUB_KEYBOARD_KEY_RIGHT_CTRL},
-    {0x4a, GRUB_KEYBOARD_KEY_NUMSLASH},
-    {0x5a, GRUB_KEYBOARD_KEY_NUMENTER},
-    {0x69, GRUB_KEYBOARD_KEY_END},
-    {0x6b, GRUB_KEYBOARD_KEY_LEFT},
-    {0x6c, GRUB_KEYBOARD_KEY_HOME},
-    {0x70, GRUB_KEYBOARD_KEY_INSERT},
-    {0x71, GRUB_KEYBOARD_KEY_DELETE},
-    {0x72, GRUB_KEYBOARD_KEY_DOWN},
-    {0x74, GRUB_KEYBOARD_KEY_RIGHT},
-    {0x75, GRUB_KEYBOARD_KEY_UP},
-    {0x7a, GRUB_KEYBOARD_KEY_NPAGE},
-    {0x7d, GRUB_KEYBOARD_KEY_PPAGE},
-  };
+struct grub_ps2_state ps2_state;
 
 static int ping_sent;
 
+static void
+grub_keyboard_controller_init (void);
+
 static void
 keyboard_controller_wait_until_ready (void)
 {
@@ -350,12 +159,12 @@ set_scancodes (void)
   if (!grub_keyboard_orig_set)
     {
       grub_dprintf ("atkeyb", "No sets support assumed\n");
-      current_set = 1;
+      ps2_state.current_set = 1;
       return;
     }
 
 #if !USE_SCANCODE_SET
-  current_set = 1;
+  ps2_state.current_set = 1;
   return;
 #else
 
@@ -363,15 +172,15 @@ set_scancodes (void)
 				  & ~KEYBOARD_AT_TRANSLATE);
 
   write_mode (2);
-  current_set = query_mode ();
-  grub_dprintf ("atkeyb", "returned set %d\n", current_set);
-  if (current_set == 2)
+  ps2_state.current_set = query_mode ();
+  grub_dprintf ("atkeyb", "returned set %d\n", ps2_state.current_set);
+  if (ps2_state.current_set == 2)
     return;
 
   write_mode (1);
-  current_set = query_mode ();
-  grub_dprintf ("atkeyb", "returned set %d\n", current_set);
-  if (current_set == 1)
+  ps2_state.current_set = query_mode ();
+  grub_dprintf ("atkeyb", "returned set %d\n", ps2_state.current_set);
+  if (ps2_state.current_set == 1)
     return;
   grub_dprintf ("atkeyb", "no supported scancode set found\n");
 #endif
@@ -386,164 +195,10 @@ keyboard_controller_led (grub_uint8_t leds)
   grub_outb (leds & 0x7, KEYBOARD_REG_DATA);
 }
 
-static int
-fetch_key (int *is_break)
-{
-  int was_ext = 0;
-  grub_uint8_t at_key;
-  int ret = 0;
-
-  if (! KEYBOARD_ISREADY (grub_inb (KEYBOARD_REG_STATUS)))
-    return -1;
-  at_key = grub_inb (KEYBOARD_REG_DATA);
-  /* May happen if no keyboard is connected. Just ignore this.  */
-  if (at_key == 0xff)
-    return -1;
-  if (at_key == 0xe0)
-    {
-      e0_received = 1;
-      return -1;
-    }
-
-  if ((current_set == 2 || current_set == 3) && at_key == 0xf0)
-    {
-      f0_received = 1;
-      return -1;
-    }
-
-  /* Setting LEDs may generate ACKs.  */
-  if (at_key == GRUB_AT_ACK)
-    return -1;
-
-  was_ext = e0_received;
-  e0_received = 0;
-
-  switch (current_set)
-    {
-    case 1:
-      *is_break = !!(at_key & 0x80);
-      if (!was_ext)
-	ret = set1_mapping[at_key & 0x7f];
-      else
-	{
-	  unsigned i;
-	  for (i = 0; i < ARRAY_SIZE (set1_e0_mapping); i++)
-	    if (set1_e0_mapping[i].from == (at_key & 0x7f))
-	      {
-		ret = set1_e0_mapping[i].to;
-		break;
-	      }
-	}
-      break;
-    case 2:
-      *is_break = f0_received;
-      f0_received = 0;
-      if (!was_ext)
-	ret = set2_mapping[at_key];
-      else
-	{
-	  unsigned i;
-	  for (i = 0; i < ARRAY_SIZE (set2_e0_mapping); i++)
-	    if (set2_e0_mapping[i].from == at_key)
-	      {
-		ret = set2_e0_mapping[i].to;
-		break;
-	      }
-	}	
-      break;
-    default:
-      return -1;
-    }
-  if (!ret)
-    {
-      if (was_ext)
-	grub_dprintf ("atkeyb", "Unknown key 0xe0+0x%02x from set %d\n",
-		      at_key, current_set);
-      else
-	grub_dprintf ("atkeyb", "Unknown key 0x%02x from set %d\n",
-		      at_key, current_set);
-      return -1;
-    }
-  return ret;
-}
-
-/* FIXME: This should become an interrupt service routine.  For now
-   it's just used to catch events from control keys.  */
-static int
-grub_keyboard_isr (grub_keyboard_key_t key, int is_break)
-{
-  if (!is_break)
-    switch (key)
-      {
-      case GRUB_KEYBOARD_KEY_LEFT_SHIFT:
-	at_keyboard_status |= GRUB_TERM_STATUS_LSHIFT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_SHIFT:
-	at_keyboard_status |= GRUB_TERM_STATUS_RSHIFT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_LEFT_CTRL:
-	at_keyboard_status |= GRUB_TERM_STATUS_LCTRL;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_CTRL:
-	at_keyboard_status |= GRUB_TERM_STATUS_RCTRL;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_ALT:
-	at_keyboard_status |= GRUB_TERM_STATUS_RALT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_LEFT_ALT:
-	at_keyboard_status |= GRUB_TERM_STATUS_LALT;
-	return 1;
-      default:
-	return 0;
-      }
-  else
-    switch (key)
-      {
-      case GRUB_KEYBOARD_KEY_LEFT_SHIFT:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_LSHIFT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_SHIFT:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_RSHIFT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_LEFT_CTRL:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_LCTRL;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_CTRL:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_RCTRL;
-	return 1;
-      case GRUB_KEYBOARD_KEY_RIGHT_ALT:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_RALT;
-	return 1;
-      case GRUB_KEYBOARD_KEY_LEFT_ALT:
-	at_keyboard_status &= ~GRUB_TERM_STATUS_LALT;
-	return 1;
-      default:
-	return 0;
-      }
-}
-
-/* If there is a raw key pending, return it; otherwise return -1.  */
-static int
-grub_keyboard_getkey (void)
-{
-  int key;
-  int is_break = 0;
-
-  key = fetch_key (&is_break);
-  if (key == -1)
-    return -1;
-
-  if (grub_keyboard_isr (key, is_break))
-    return -1;
-  if (is_break)
-    return -1;
-  return key;
-}
-
 int
 grub_at_keyboard_is_alive (void)
 {
-  if (current_set != 0)
+  if (ps2_state.current_set != 0)
     return 1;
   if (ping_sent
       && KEYBOARD_COMMAND_ISREADY (grub_inb (KEYBOARD_REG_STATUS))
@@ -566,51 +221,28 @@ grub_at_keyboard_is_alive (void)
 static int
 grub_at_keyboard_getkey (struct grub_term_input *term __attribute__ ((unused)))
 {
-  int code;
+  grub_uint8_t at_key;
+  int ret;
+  grub_uint8_t old_led;
 
   if (!grub_at_keyboard_is_alive ())
     return GRUB_TERM_NO_KEY;
 
-  code = grub_keyboard_getkey ();
-  if (code == -1)
-    return GRUB_TERM_NO_KEY;
-#ifdef DEBUG_AT_KEYBOARD
-  grub_dprintf ("atkeyb", "Detected key 0x%x\n", code);
-#endif
-  switch (code)
-    {
-      case GRUB_KEYBOARD_KEY_CAPS_LOCK:
-	at_keyboard_status ^= GRUB_TERM_STATUS_CAPS;
-	led_status ^= KEYBOARD_LED_CAPS;
-	keyboard_controller_led (led_status);
+  if (! KEYBOARD_ISREADY (grub_inb (KEYBOARD_REG_STATUS)))
+    return -1;
+  at_key = grub_inb (KEYBOARD_REG_DATA);
+  old_led = ps2_state.led_status;
 
-#ifdef DEBUG_AT_KEYBOARD
-	grub_dprintf ("atkeyb", "caps_lock = %d\n", !!(at_keyboard_status & GRUB_KEYBOARD_STATUS_CAPS_LOCK));
-#endif
-	return GRUB_TERM_NO_KEY;
-      case GRUB_KEYBOARD_KEY_NUM_LOCK:
-	at_keyboard_status ^= GRUB_TERM_STATUS_NUM;
-	led_status ^= KEYBOARD_LED_NUM;
-	keyboard_controller_led (led_status);
-
-#ifdef DEBUG_AT_KEYBOARD
-	grub_dprintf ("atkeyb", "num_lock = %d\n", !!(at_keyboard_status & GRUB_KEYBOARD_STATUS_NUM_LOCK));
-#endif
-	return GRUB_TERM_NO_KEY;
-      case GRUB_KEYBOARD_KEY_SCROLL_LOCK:
-	at_keyboard_status ^= GRUB_TERM_STATUS_SCROLL;
-	led_status ^= KEYBOARD_LED_SCROLL;
-	keyboard_controller_led (led_status);
-	return GRUB_TERM_NO_KEY;
-      default:
-	return grub_term_map_key (code, at_keyboard_status);
-    }
+  ret = grub_ps2_process_incoming_byte (&ps2_state, at_key);
+  if (old_led != ps2_state.led_status)
+    keyboard_controller_led (ps2_state.led_status);
+  return ret;
 }
 
 static void
 grub_keyboard_controller_init (void)
 {
-  at_keyboard_status = 0;
+  ps2_state.at_keyboard_status = 0;
   /* Drain input buffer. */
   while (1)
     {
@@ -632,13 +264,13 @@ grub_keyboard_controller_init (void)
   grub_keyboard_orig_set = query_mode ();
 #endif
   set_scancodes ();
-  keyboard_controller_led (led_status);
+  keyboard_controller_led (ps2_state.led_status);
 }
 
 static grub_err_t
 grub_keyboard_controller_fini (struct grub_term_input *term __attribute__ ((unused)))
 {
-  if (current_set == 0)
+  if (ps2_state.current_set == 0)
     return GRUB_ERR_NONE;
   if (grub_keyboard_orig_set)
     write_mode (grub_keyboard_orig_set);
@@ -655,7 +287,7 @@ grub_at_fini_hw (int noreturn __attribute__ ((unused)))
 static grub_err_t
 grub_at_restore_hw (void)
 {
-  if (current_set == 0)
+  if (ps2_state.current_set == 0)
     return GRUB_ERR_NONE;
 
   /* Drain input buffer. */
@@ -668,7 +300,7 @@ grub_at_restore_hw (void)
       grub_inb (KEYBOARD_REG_DATA);
     }
   set_scancodes ();
-  keyboard_controller_led (led_status);
+  keyboard_controller_led (ps2_state.led_status);
 
   return GRUB_ERR_NONE;
 }
diff --git a/grub-core/term/ps2.c b/grub-core/term/ps2.c
new file mode 100644
index 00000000000..7ae4e9f2f8c
--- /dev/null
+++ b/grub-core/term/ps2.c
@@ -0,0 +1,387 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007,2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/term.h>
+#include <grub/keyboard_layouts.h>
+#include <grub/ps2.h>
+
+#define KEYBOARD_LED_SCROLL		(1 << 0)
+#define KEYBOARD_LED_NUM		(1 << 1)
+#define KEYBOARD_LED_CAPS		(1 << 2)
+
+static const grub_uint8_t set1_mapping[128] =
+  {
+    /* 0x00 */ 0 /* Unused  */,               GRUB_KEYBOARD_KEY_ESCAPE, 
+    /* 0x02 */ GRUB_KEYBOARD_KEY_1,           GRUB_KEYBOARD_KEY_2, 
+    /* 0x04 */ GRUB_KEYBOARD_KEY_3,           GRUB_KEYBOARD_KEY_4, 
+    /* 0x06 */ GRUB_KEYBOARD_KEY_5,           GRUB_KEYBOARD_KEY_6, 
+    /* 0x08 */ GRUB_KEYBOARD_KEY_7,           GRUB_KEYBOARD_KEY_8, 
+    /* 0x0a */ GRUB_KEYBOARD_KEY_9,           GRUB_KEYBOARD_KEY_0, 
+    /* 0x0c */ GRUB_KEYBOARD_KEY_DASH,        GRUB_KEYBOARD_KEY_EQUAL, 
+    /* 0x0e */ GRUB_KEYBOARD_KEY_BACKSPACE,   GRUB_KEYBOARD_KEY_TAB, 
+    /* 0x10 */ GRUB_KEYBOARD_KEY_Q,           GRUB_KEYBOARD_KEY_W, 
+    /* 0x12 */ GRUB_KEYBOARD_KEY_E,           GRUB_KEYBOARD_KEY_R, 
+    /* 0x14 */ GRUB_KEYBOARD_KEY_T,           GRUB_KEYBOARD_KEY_Y, 
+    /* 0x16 */ GRUB_KEYBOARD_KEY_U,           GRUB_KEYBOARD_KEY_I, 
+    /* 0x18 */ GRUB_KEYBOARD_KEY_O,           GRUB_KEYBOARD_KEY_P, 
+    /* 0x1a */ GRUB_KEYBOARD_KEY_LBRACKET,    GRUB_KEYBOARD_KEY_RBRACKET, 
+    /* 0x1c */ GRUB_KEYBOARD_KEY_ENTER,       GRUB_KEYBOARD_KEY_LEFT_CTRL, 
+    /* 0x1e */ GRUB_KEYBOARD_KEY_A,           GRUB_KEYBOARD_KEY_S, 
+    /* 0x20 */ GRUB_KEYBOARD_KEY_D,           GRUB_KEYBOARD_KEY_F, 
+    /* 0x22 */ GRUB_KEYBOARD_KEY_G,           GRUB_KEYBOARD_KEY_H, 
+    /* 0x24 */ GRUB_KEYBOARD_KEY_J,           GRUB_KEYBOARD_KEY_K, 
+    /* 0x26 */ GRUB_KEYBOARD_KEY_L,           GRUB_KEYBOARD_KEY_SEMICOLON, 
+    /* 0x28 */ GRUB_KEYBOARD_KEY_DQUOTE,      GRUB_KEYBOARD_KEY_RQUOTE, 
+    /* 0x2a */ GRUB_KEYBOARD_KEY_LEFT_SHIFT,  GRUB_KEYBOARD_KEY_BACKSLASH, 
+    /* 0x2c */ GRUB_KEYBOARD_KEY_Z,           GRUB_KEYBOARD_KEY_X, 
+    /* 0x2e */ GRUB_KEYBOARD_KEY_C,           GRUB_KEYBOARD_KEY_V, 
+    /* 0x30 */ GRUB_KEYBOARD_KEY_B,           GRUB_KEYBOARD_KEY_N, 
+    /* 0x32 */ GRUB_KEYBOARD_KEY_M,           GRUB_KEYBOARD_KEY_COMMA, 
+    /* 0x34 */ GRUB_KEYBOARD_KEY_DOT,         GRUB_KEYBOARD_KEY_SLASH, 
+    /* 0x36 */ GRUB_KEYBOARD_KEY_RIGHT_SHIFT, GRUB_KEYBOARD_KEY_NUMMUL, 
+    /* 0x38 */ GRUB_KEYBOARD_KEY_LEFT_ALT,    GRUB_KEYBOARD_KEY_SPACE, 
+    /* 0x3a */ GRUB_KEYBOARD_KEY_CAPS_LOCK,   GRUB_KEYBOARD_KEY_F1, 
+    /* 0x3c */ GRUB_KEYBOARD_KEY_F2,          GRUB_KEYBOARD_KEY_F3, 
+    /* 0x3e */ GRUB_KEYBOARD_KEY_F4,          GRUB_KEYBOARD_KEY_F5, 
+    /* 0x40 */ GRUB_KEYBOARD_KEY_F6,          GRUB_KEYBOARD_KEY_F7, 
+    /* 0x42 */ GRUB_KEYBOARD_KEY_F8,          GRUB_KEYBOARD_KEY_F9, 
+    /* 0x44 */ GRUB_KEYBOARD_KEY_F10,         GRUB_KEYBOARD_KEY_NUM_LOCK, 
+    /* 0x46 */ GRUB_KEYBOARD_KEY_SCROLL_LOCK, GRUB_KEYBOARD_KEY_NUM7, 
+    /* 0x48 */ GRUB_KEYBOARD_KEY_NUM8,        GRUB_KEYBOARD_KEY_NUM9, 
+    /* 0x4a */ GRUB_KEYBOARD_KEY_NUMMINUS,    GRUB_KEYBOARD_KEY_NUM4, 
+    /* 0x4c */ GRUB_KEYBOARD_KEY_NUM5,        GRUB_KEYBOARD_KEY_NUM6, 
+    /* 0x4e */ GRUB_KEYBOARD_KEY_NUMPLUS,     GRUB_KEYBOARD_KEY_NUM1, 
+    /* 0x50 */ GRUB_KEYBOARD_KEY_NUM2,        GRUB_KEYBOARD_KEY_NUM3, 
+    /* 0x52 */ GRUB_KEYBOARD_KEY_NUM0,        GRUB_KEYBOARD_KEY_NUMDOT, 
+    /* 0x54 */ 0,                             0, 
+    /* 0x56 */ GRUB_KEYBOARD_KEY_102ND,       GRUB_KEYBOARD_KEY_F11, 
+    /* 0x58 */ GRUB_KEYBOARD_KEY_F12,         0,
+    /* 0x5a */ 0,                             0,
+    /* 0x5c */ 0,                             0,
+    /* 0x5e */ 0,                             0,
+    /* 0x60 */ 0,                             0,
+    /* 0x62 */ 0,                             0,
+    /* OLPC keys. Just mapped to normal keys.  */
+    /* 0x64 */ 0,                             GRUB_KEYBOARD_KEY_UP,
+    /* 0x66 */ GRUB_KEYBOARD_KEY_DOWN,        GRUB_KEYBOARD_KEY_LEFT,
+    /* 0x68 */ GRUB_KEYBOARD_KEY_RIGHT,       0,
+    /* 0x6a */ 0,                             0,
+    /* 0x6c */ 0,                             0,
+    /* 0x6e */ 0,                             0,
+    /* 0x70 */ 0,                             0,
+    /* 0x72 */ 0,                             GRUB_KEYBOARD_KEY_JP_RO,
+    /* 0x74 */ 0,                             0,
+    /* 0x76 */ 0,                             0,
+    /* 0x78 */ 0,                             0,
+    /* 0x7a */ 0,                             0,
+    /* 0x7c */ 0,                             GRUB_KEYBOARD_KEY_JP_YEN,
+    /* 0x7e */ GRUB_KEYBOARD_KEY_KPCOMMA
+  };
+
+static const struct
+{
+  grub_uint8_t from, to;
+} set1_e0_mapping[] = 
+  {
+    {0x1c, GRUB_KEYBOARD_KEY_NUMENTER},
+    {0x1d, GRUB_KEYBOARD_KEY_RIGHT_CTRL},
+    {0x35, GRUB_KEYBOARD_KEY_NUMSLASH }, 
+    {0x38, GRUB_KEYBOARD_KEY_RIGHT_ALT},
+    {0x47, GRUB_KEYBOARD_KEY_HOME}, 
+    {0x48, GRUB_KEYBOARD_KEY_UP},
+    {0x49, GRUB_KEYBOARD_KEY_PPAGE}, 
+    {0x4b, GRUB_KEYBOARD_KEY_LEFT},
+    {0x4d, GRUB_KEYBOARD_KEY_RIGHT},
+    {0x4f, GRUB_KEYBOARD_KEY_END}, 
+    {0x50, GRUB_KEYBOARD_KEY_DOWN},
+    {0x51, GRUB_KEYBOARD_KEY_NPAGE},
+    {0x52, GRUB_KEYBOARD_KEY_INSERT},
+    {0x53, GRUB_KEYBOARD_KEY_DELETE}, 
+  };
+
+static const grub_uint8_t set2_mapping[256] =
+  {
+    /* 0x00 */ 0,                             GRUB_KEYBOARD_KEY_F9,
+    /* 0x02 */ 0,                             GRUB_KEYBOARD_KEY_F5,
+    /* 0x04 */ GRUB_KEYBOARD_KEY_F3,          GRUB_KEYBOARD_KEY_F1,
+    /* 0x06 */ GRUB_KEYBOARD_KEY_F2,          GRUB_KEYBOARD_KEY_F12,
+    /* 0x08 */ 0,                             GRUB_KEYBOARD_KEY_F10,
+    /* 0x0a */ GRUB_KEYBOARD_KEY_F8,          GRUB_KEYBOARD_KEY_F6,
+    /* 0x0c */ GRUB_KEYBOARD_KEY_F4,          GRUB_KEYBOARD_KEY_TAB,
+    /* 0x0e */ GRUB_KEYBOARD_KEY_RQUOTE,      0,
+    /* 0x10 */ 0,                             GRUB_KEYBOARD_KEY_LEFT_ALT,
+    /* 0x12 */ GRUB_KEYBOARD_KEY_LEFT_SHIFT,  0,
+    /* 0x14 */ GRUB_KEYBOARD_KEY_LEFT_CTRL,   GRUB_KEYBOARD_KEY_Q,
+    /* 0x16 */ GRUB_KEYBOARD_KEY_1,           0,
+    /* 0x18 */ 0,                             0,
+    /* 0x1a */ GRUB_KEYBOARD_KEY_Z,           GRUB_KEYBOARD_KEY_S,
+    /* 0x1c */ GRUB_KEYBOARD_KEY_A,           GRUB_KEYBOARD_KEY_W,
+    /* 0x1e */ GRUB_KEYBOARD_KEY_2,           0,
+    /* 0x20 */ 0,                             GRUB_KEYBOARD_KEY_C,
+    /* 0x22 */ GRUB_KEYBOARD_KEY_X,           GRUB_KEYBOARD_KEY_D,
+    /* 0x24 */ GRUB_KEYBOARD_KEY_E,           GRUB_KEYBOARD_KEY_4,
+    /* 0x26 */ GRUB_KEYBOARD_KEY_3,           0,
+    /* 0x28 */ 0,                             GRUB_KEYBOARD_KEY_SPACE,
+    /* 0x2a */ GRUB_KEYBOARD_KEY_V,           GRUB_KEYBOARD_KEY_F,
+    /* 0x2c */ GRUB_KEYBOARD_KEY_T,           GRUB_KEYBOARD_KEY_R,
+    /* 0x2e */ GRUB_KEYBOARD_KEY_5,           0,
+    /* 0x30 */ 0,                             GRUB_KEYBOARD_KEY_N,
+    /* 0x32 */ GRUB_KEYBOARD_KEY_B,           GRUB_KEYBOARD_KEY_H,
+    /* 0x34 */ GRUB_KEYBOARD_KEY_G,           GRUB_KEYBOARD_KEY_Y,
+    /* 0x36 */ GRUB_KEYBOARD_KEY_6,           0,
+    /* 0x38 */ 0,                             0,
+    /* 0x3a */ GRUB_KEYBOARD_KEY_M,           GRUB_KEYBOARD_KEY_J,
+    /* 0x3c */ GRUB_KEYBOARD_KEY_U,           GRUB_KEYBOARD_KEY_7,
+    /* 0x3e */ GRUB_KEYBOARD_KEY_8,           0,
+    /* 0x40 */ 0,                             GRUB_KEYBOARD_KEY_COMMA,
+    /* 0x42 */ GRUB_KEYBOARD_KEY_K,           GRUB_KEYBOARD_KEY_I,
+    /* 0x44 */ GRUB_KEYBOARD_KEY_O,           GRUB_KEYBOARD_KEY_0,
+    /* 0x46 */ GRUB_KEYBOARD_KEY_9,           0,
+    /* 0x48 */ 0,                             GRUB_KEYBOARD_KEY_DOT,
+    /* 0x4a */ GRUB_KEYBOARD_KEY_SLASH,       GRUB_KEYBOARD_KEY_L,
+    /* 0x4c */ GRUB_KEYBOARD_KEY_SEMICOLON,   GRUB_KEYBOARD_KEY_P,
+    /* 0x4e */ GRUB_KEYBOARD_KEY_DASH,        0,
+    /* 0x50 */ 0,                             GRUB_KEYBOARD_KEY_JP_RO,
+    /* 0x52 */ GRUB_KEYBOARD_KEY_DQUOTE,      0,
+    /* 0x54 */ GRUB_KEYBOARD_KEY_LBRACKET,    GRUB_KEYBOARD_KEY_EQUAL,
+    /* 0x56 */ 0,                             0,
+    /* 0x58 */ GRUB_KEYBOARD_KEY_CAPS_LOCK,   GRUB_KEYBOARD_KEY_RIGHT_SHIFT,
+    /* 0x5a */ GRUB_KEYBOARD_KEY_ENTER,       GRUB_KEYBOARD_KEY_RBRACKET,
+    /* 0x5c */ 0,                             GRUB_KEYBOARD_KEY_BACKSLASH,
+    /* 0x5e */ 0,                             0,
+    /* 0x60 */ 0,                             GRUB_KEYBOARD_KEY_102ND,
+    /* 0x62 */ 0,                             0,
+    /* 0x64 */ 0,                             0,
+    /* 0x66 */ GRUB_KEYBOARD_KEY_BACKSPACE,   0,
+    /* 0x68 */ 0,                             GRUB_KEYBOARD_KEY_NUM1,
+    /* 0x6a */ GRUB_KEYBOARD_KEY_JP_YEN,      GRUB_KEYBOARD_KEY_NUM4,
+    /* 0x6c */ GRUB_KEYBOARD_KEY_NUM7,        GRUB_KEYBOARD_KEY_KPCOMMA,
+    /* 0x6e */ 0,                             0,
+    /* 0x70 */ GRUB_KEYBOARD_KEY_NUM0,        GRUB_KEYBOARD_KEY_NUMDOT,
+    /* 0x72 */ GRUB_KEYBOARD_KEY_NUM2,        GRUB_KEYBOARD_KEY_NUM5,
+    /* 0x74 */ GRUB_KEYBOARD_KEY_NUM6,        GRUB_KEYBOARD_KEY_NUM8,
+    /* 0x76 */ GRUB_KEYBOARD_KEY_ESCAPE,      GRUB_KEYBOARD_KEY_NUM_LOCK,
+    /* 0x78 */ GRUB_KEYBOARD_KEY_F11,         GRUB_KEYBOARD_KEY_NUMPLUS,
+    /* 0x7a */ GRUB_KEYBOARD_KEY_NUM3,        GRUB_KEYBOARD_KEY_NUMMINUS,
+    /* 0x7c */ GRUB_KEYBOARD_KEY_NUMMUL,      GRUB_KEYBOARD_KEY_NUM9,
+    /* 0x7e */ GRUB_KEYBOARD_KEY_SCROLL_LOCK, 0,
+    /* 0x80 */ 0,                             0, 
+    /* 0x82 */ 0,                             GRUB_KEYBOARD_KEY_F7,
+  };
+
+static const struct
+{
+  grub_uint8_t from, to;
+} set2_e0_mapping[] = 
+  {
+    {0x11, GRUB_KEYBOARD_KEY_RIGHT_ALT},
+    {0x14, GRUB_KEYBOARD_KEY_RIGHT_CTRL},
+    {0x4a, GRUB_KEYBOARD_KEY_NUMSLASH},
+    {0x5a, GRUB_KEYBOARD_KEY_NUMENTER},
+    {0x69, GRUB_KEYBOARD_KEY_END},
+    {0x6b, GRUB_KEYBOARD_KEY_LEFT},
+    {0x6c, GRUB_KEYBOARD_KEY_HOME},
+    {0x70, GRUB_KEYBOARD_KEY_INSERT},
+    {0x71, GRUB_KEYBOARD_KEY_DELETE},
+    {0x72, GRUB_KEYBOARD_KEY_DOWN},
+    {0x74, GRUB_KEYBOARD_KEY_RIGHT},
+    {0x75, GRUB_KEYBOARD_KEY_UP},
+    {0x7a, GRUB_KEYBOARD_KEY_NPAGE},
+    {0x7d, GRUB_KEYBOARD_KEY_PPAGE},
+  };
+
+static int
+fetch_key (struct grub_ps2_state *ps2_state, grub_uint8_t at_key, int *is_break)
+{
+  int was_ext = 0;
+  int ret = 0;
+
+  /* May happen if no keyboard is connected. Just ignore this.  */
+  if (at_key == 0xff)
+    return -1;
+  if (at_key == 0xe0)
+    {
+      ps2_state->e0_received = 1;
+      return -1;
+    }
+
+  if ((ps2_state->current_set == 2 || ps2_state->current_set == 3) && at_key == 0xf0)
+    {
+      ps2_state->f0_received = 1;
+      return -1;
+    }
+
+  /* Setting LEDs may generate ACKs.  */
+  if (at_key == GRUB_AT_ACK)
+    return -1;
+
+  was_ext = ps2_state->e0_received;
+  ps2_state->e0_received = 0;
+
+  switch (ps2_state->current_set)
+    {
+    case 1:
+      *is_break = !!(at_key & 0x80);
+      if (!was_ext)
+	ret = set1_mapping[at_key & 0x7f];
+      else
+	{
+	  unsigned i;
+	  for (i = 0; i < ARRAY_SIZE (set1_e0_mapping); i++)
+	    if (set1_e0_mapping[i].from == (at_key & 0x7f))
+	      {
+		ret = set1_e0_mapping[i].to;
+		break;
+	      }
+	}
+      break;
+    case 2:
+      *is_break = ps2_state->f0_received;
+      ps2_state->f0_received = 0;
+      if (!was_ext)
+	ret = set2_mapping[at_key];
+      else
+	{
+	  unsigned i;
+	  for (i = 0; i < ARRAY_SIZE (set2_e0_mapping); i++)
+	    if (set2_e0_mapping[i].from == at_key)
+	      {
+		ret = set2_e0_mapping[i].to;
+		break;
+	      }
+	}	
+      break;
+    default:
+      return -1;
+    }
+  if (!ret)
+    {
+      if (was_ext)
+	grub_dprintf ("atkeyb", "Unknown key 0xe0+0x%02x from set %d\n",
+		      at_key, ps2_state->current_set);
+      else
+	grub_dprintf ("atkeyb", "Unknown key 0x%02x from set %d\n",
+		      at_key, ps2_state->current_set);
+      return -1;
+    }
+  return ret;
+}
+
+/* FIXME: This should become an interrupt service routine.  For now
+   it's just used to catch events from control keys.  */
+static int
+grub_keyboard_isr (struct grub_ps2_state *ps2_state,
+		   grub_keyboard_key_t key, int is_break)
+{
+  if (!is_break)
+    switch (key)
+      {
+      case GRUB_KEYBOARD_KEY_LEFT_SHIFT:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_LSHIFT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_SHIFT:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_RSHIFT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_LEFT_CTRL:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_LCTRL;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_CTRL:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_RCTRL;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_ALT:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_RALT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_LEFT_ALT:
+	ps2_state->at_keyboard_status |= GRUB_TERM_STATUS_LALT;
+	return 1;
+      default:
+	return 0;
+      }
+  else
+    switch (key)
+      {
+      case GRUB_KEYBOARD_KEY_LEFT_SHIFT:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_LSHIFT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_SHIFT:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_RSHIFT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_LEFT_CTRL:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_LCTRL;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_CTRL:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_RCTRL;
+	return 1;
+      case GRUB_KEYBOARD_KEY_RIGHT_ALT:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_RALT;
+	return 1;
+      case GRUB_KEYBOARD_KEY_LEFT_ALT:
+	ps2_state->at_keyboard_status &= ~GRUB_TERM_STATUS_LALT;
+	return 1;
+      default:
+	return 0;
+      }
+}
+
+/* If there is a key pending, return it; otherwise return GRUB_TERM_NO_KEY.  */
+int
+grub_ps2_process_incoming_byte (struct grub_ps2_state *ps2_state,
+				grub_uint8_t at_key)
+{
+  int code;
+  int is_break = 0;
+
+  code = fetch_key (ps2_state, at_key, &is_break);
+  if (code == -1)
+    return GRUB_TERM_NO_KEY;
+
+  if (grub_keyboard_isr (ps2_state, code, is_break))
+    return GRUB_TERM_NO_KEY;
+  if (is_break)
+    return GRUB_TERM_NO_KEY;
+#ifdef DEBUG_AT_KEYBOARD
+  grub_dprintf ("atkeyb", "Detected key 0x%x\n", code);
+#endif
+  switch (code)
+    {
+      case GRUB_KEYBOARD_KEY_CAPS_LOCK:
+	ps2_state->at_keyboard_status ^= GRUB_TERM_STATUS_CAPS;
+	ps2_state->led_status ^= KEYBOARD_LED_CAPS;
+
+#ifdef DEBUG_AT_KEYBOARD
+	grub_dprintf ("atkeyb", "caps_lock = %d\n", !!(ps2_state->at_keyboard_status & GRUB_KEYBOARD_STATUS_CAPS_LOCK));
+#endif
+	return GRUB_TERM_NO_KEY;
+      case GRUB_KEYBOARD_KEY_NUM_LOCK:
+	ps2_state->at_keyboard_status ^= GRUB_TERM_STATUS_NUM;
+	ps2_state->led_status ^= KEYBOARD_LED_NUM;
+
+#ifdef DEBUG_AT_KEYBOARD
+	grub_dprintf ("atkeyb", "num_lock = %d\n", !!(ps2_state->at_keyboard_status & GRUB_KEYBOARD_STATUS_NUM_LOCK));
+#endif
+	return GRUB_TERM_NO_KEY;
+      case GRUB_KEYBOARD_KEY_SCROLL_LOCK:
+	ps2_state->at_keyboard_status ^= GRUB_TERM_STATUS_SCROLL;
+	ps2_state->led_status ^= KEYBOARD_LED_SCROLL;
+	return GRUB_TERM_NO_KEY;
+      default:
+	return grub_term_map_key (code, ps2_state->at_keyboard_status);
+    }
+}
diff --git a/include/grub/at_keyboard.h b/include/grub/at_keyboard.h
index b4f8ff0a061..b031523eb7d 100644
--- a/include/grub/at_keyboard.h
+++ b/include/grub/at_keyboard.h
@@ -27,10 +27,6 @@
 
 #define KEYBOARD_AT_TRANSLATE		0x40
 
-#define GRUB_AT_ACK                     0xfa
-#define GRUB_AT_NACK                    0xfe
-#define GRUB_AT_TRIES                   5
-
 #define KEYBOARD_ISMAKE(x)	!((x) & 0x80)
 #define KEYBOARD_ISREADY(x)	((x) & 0x01)
 #define KEYBOARD_SCANCODE(x)	((x) & 0x7f)
diff --git a/include/grub/ps2.h b/include/grub/ps2.h
new file mode 100644
index 00000000000..4f2e527e497
--- /dev/null
+++ b/include/grub/ps2.h
@@ -0,0 +1,43 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007,2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_PS2_HEADER
+#define GRUB_PS2_HEADER	1
+
+#include <grub/types.h>
+
+#define GRUB_AT_ACK                     0xfa
+#define GRUB_AT_NACK                    0xfe
+#define GRUB_AT_TRIES                   5
+
+/* Make sure it's zeroed-out and set current_set at init.  */
+struct grub_ps2_state
+{
+  int e0_received;
+  int f0_received;
+  grub_uint8_t led_status;
+  short at_keyboard_status;
+  grub_uint8_t current_set;
+};
+
+/* If there is a key pending, return it; otherwise return GRUB_TERM_NO_KEY.  */
+int
+grub_ps2_process_incoming_byte (struct grub_ps2_state *ps2_state,
+				grub_uint8_t data);
+
+#endif
-- 
2.17.1