The nuconsole input terminal works in conjunction with the nusetkey
module to support changing the keyboard keymap.
---
grub-core/Makefile.core.def | 6 ++
grub-core/term/i386/pc/nuconsole.c | 111 +++++++++++++++++++++++++++++++++++++
2 files changed, 117 insertions(+)
create mode 100644 grub-core/term/i386/pc/nuconsole.c
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 6f9e1f0..31d43f2 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -2319,3 +2319,9 @@ module = {
i386_pc = commands/i386/pc/nusetkey.c;
enable = i386_pc;
};
+
+module = {
+ name = nuconsole;
+ i386_pc = term/i386/pc/nuconsole.c;
+ enable = i386_pc;
+};
diff --git a/grub-core/term/i386/pc/nuconsole.c
b/grub-core/term/i386/pc/nuconsole.c
new file mode 100644
index 0000000..ede33ea
--- /dev/null
+++ b/grub-core/term/i386/pc/nuconsole.c
@@ -0,0 +1,111 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2002,2003,2005,2007,2008,2009 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/machine/memory.h>
+#include <grub/term.h>
+#include <grub/types.h>
+#include <grub/machine/int.h>
+#include <grub/machine/nusetkey.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+/*
+ * grub_nuconsole_getkey - If a character is pending, then return it.
+ * Otherwise, return GRUB_TERM_NO_KEY (i.e., -1).
+ *
+ * BIOS call 'INT 16H Function 11H' checks whether
+ * a character is pending, supporting so-called
+ * 'extended' key codes.
+ * Call this function with:
+ * - %ah = 0x11.
+ * When the function returns:
+ * - If a character is pending, then:
+ * - Zero flag is clear.
+ * - %ah = keyboard scan code.
+ * - %al = ASCII character.
+ * - If there is no character pending, then:
+ * - Zero flag is set.
+ *
+ * BIOS call 'INT 16H Function 10H' reads a
+ * character from the keyboard, again supporting
+ * 'extended' key codes.
+ * Call this function with:
+ * - %ah = 0x10.
+ * When the function returns:
+ * - %ah = keyboard scan code.
+ * - %al = ASCII character.
+ */
+static int
+grub_nuconsole_getkey (struct grub_term_input *term __attribute__ ((unused)))
+{
+ struct grub_bios_int_registers regs;
+
+ /*
+ * Check if a character is pending.
+ */
+ regs.eax = 0x1100;
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+ grub_bios_interrupt (0x16, ®s);
+ if (regs.flags & GRUB_CPU_INT_FLAGS_ZERO)
+ return GRUB_TERM_NO_KEY;
+
+ /*
+ * Read the character that is pending.
+ */
+ regs.eax = 0x1000;
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+ grub_bios_interrupt (0x16, ®s);
+
+ /*
+ * Process the key code that was read from the keyboard, and return the
+ * corresponding GRUB key code.
+ */
+ return grub_nusetkey_xlat (regs.eax);
+}
+
+static const struct grub_machine_bios_data_area *bios_data_area =
+ (struct grub_machine_bios_data_area *)
GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
+
+/*
+ * grub_nuconsole_getkeystatus - Return the Shift, Ctrl, and Alt modifier
+ * states.
+ */
+static int
+grub_nuconsole_getkeystatus (struct grub_term_input *term __attribute__
((unused)))
+{
+ /* conveniently GRUB keystatus is modelled after BIOS one. */
+ return bios_data_area->keyboard_flag_lower & ~0x80;
+}
+
+static struct grub_term_input grub_nuconsole_term_input =
+ {
+ .name = "nuconsole",
+ .getkey = grub_nuconsole_getkey,
+ .getkeystatus = grub_nuconsole_getkeystatus
+ };
+
+GRUB_MOD_INIT(nuconsole)
+{
+ grub_term_register_input ("nuconsole", &grub_nuconsole_term_input);
+}
+
+GRUB_MOD_FINI(nuconsole)
+{
+ grub_term_unregister_input (&grub_nuconsole_term_input);
+}
--
2.1.4
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