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diff --git a/quantum/modifiers.h b/quantum/modifiers.h
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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+/** \brief 5-bit packed modifiers
+ *
+ * Mod bits: 43210
+ * bit 0 ||||+- Control
+ * bit 1 |||+-- Shift
+ * bit 2 ||+--- Alt
+ * bit 3 |+---- Gui
+ * bit 4 +----- LR flag(Left:0, Right:1)
+ */
+enum mods_5bit {
+ MOD_LCTL = 0x01,
+ MOD_LSFT = 0x02,
+ MOD_LALT = 0x04,
+ MOD_LGUI = 0x08,
+ MOD_RCTL = 0x11,
+ MOD_RSFT = 0x12,
+ MOD_RALT = 0x14,
+ MOD_RGUI = 0x18,
+};
+#define MOD_HYPR (MOD_LCTL | MOD_LSFT | MOD_LALT | MOD_LGUI)
+#define MOD_MEH (MOD_LCTL | MOD_LSFT | MOD_LALT)
+
+/** \brief 8-bit packed modifiers
+ */
+enum mods_8bit {
+ MOD_BIT_LCTRL = 0b00000001,
+ MOD_BIT_LSHIFT = 0b00000010,
+ MOD_BIT_LALT = 0b00000100,
+ MOD_BIT_LGUI = 0b00001000,
+ MOD_BIT_RCTRL = 0b00010000,
+ MOD_BIT_RSHIFT = 0b00100000,
+ MOD_BIT_RALT = 0b01000000,
+ MOD_BIT_RGUI = 0b10000000,
+};
+#define MOD_MASK_CTRL (MOD_BIT_LCTRL | MOD_BIT_RCTRL)
+#define MOD_MASK_SHIFT (MOD_BIT_LSHIFT | MOD_BIT_RSHIFT)
+#define MOD_MASK_ALT (MOD_BIT_LALT | MOD_BIT_RALT)
+#define MOD_MASK_GUI (MOD_BIT_LGUI | MOD_BIT_RGUI)
+#define MOD_MASK_CS (MOD_MASK_CTRL | MOD_MASK_SHIFT)
+#define MOD_MASK_CA (MOD_MASK_CTRL | MOD_MASK_ALT)
+#define MOD_MASK_CG (MOD_MASK_CTRL | MOD_MASK_GUI)
+#define MOD_MASK_SA (MOD_MASK_SHIFT | MOD_MASK_ALT)
+#define MOD_MASK_SG (MOD_MASK_SHIFT | MOD_MASK_GUI)
+#define MOD_MASK_AG (MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_CSA (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT)
+#define MOD_MASK_CSG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_GUI)
+#define MOD_MASK_CAG (MOD_MASK_CTRL | MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_SAG (MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_CSAG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)