kernel: Introduce per-arch M_WORD_SIZE

The machine word size describes how many bytes of data can be processed
at once. Add a per-arch M_WORD_SIZE constant to represent this platform
specific characteristic. This commit also adds an MALIGN() helper macro
to sys/param.h which can be used for optimization purposes in cases
where you want data to be perfectly aligned on a machine word boundary.

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 80 insertions, 0 deletions

diff --git a/sys/include/arch/aarch64/param.h b/sys/include/arch/aarch64/param.h
new file mode 100644
index 0000000..c074ffb
--- /dev/null
+++ b/sys/include/arch/aarch64/param.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _AARCH64_PARAM_H_
+#define _AARCH64_PARAM_H_
+
+#define M_WORD_SIZE 4
+
+#endif  /* !_AARCH64_PARAM_H_ */
diff --git a/sys/include/arch/amd64/param.h b/sys/include/arch/amd64/param.h
new file mode 100644
index 0000000..6ea3fca
--- /dev/null
+++ b/sys/include/arch/amd64/param.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _AMD64_PARAM_H_
+#define _AMD64_PARAM_H_
+
+#define M_WORD_SIZE 8
+
+#endif  /* !_AMD64_PARAM_H_ */
diff --git a/sys/include/sys/param.h b/sys/include/sys/param.h
index 7331d5f..2bbbabd 100644
--- a/sys/include/sys/param.h
+++ b/sys/include/sys/param.h
@@ -30,11 +30,20 @@
 #ifndef _SYS_PARAM_H_
 #define _SYS_PARAM_H_
 
+#if defined(_KERNEL)
+#include <machine/param.h>
+#endif
+
 /* Assumed cache line size */
 #ifndef COHERENCY_UNIT
 #define COHERENCY_UNIT 64
 #endif
 
+/* Assumed machine word size */
+#ifndef M_WORD_SIZE
+#define M_WORD_SIZE 4
+#endif
+
 /* Bit related macros */
 #define ISSET(v, f)  ((v) & (f))
 #define BIT(n) (1ULL << (n))
@@ -47,6 +56,7 @@
 /* Align up/down a value */
 #define ALIGN_DOWN(value, align)      ((value) & ~((align)-1))
 #define ALIGN_UP(value, align)        (((value) + (align)-1) & ~((align)-1))
+#define MALIGN(value)                 ALIGN_UP((value), M_WORD_SIZE)
 
 /* Bitmap helper macros */
 #define setbit(a, b) ((a)[(b) >> 3] |= BIT(b % 8))