From f8ce8234aa7247c8f3a4317f5671b5fd40ffb8c8 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 7 Jun 2024 21:25:10 -0400
Subject: kernel: Add __cacheline_aligned macro

This commit introduces a "__cacheline_aligned" macro which aligns data
by the cache line size (COHERENCY_UNIT bytes). This is useful for
heavily contended locks.

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/conf/link.ld | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'sys/arch/amd64')

diff --git a/sys/arch/amd64/conf/link.ld b/sys/arch/amd64/conf/link.ld
index b073054..9c47a81 100644
--- a/sys/arch/amd64/conf/link.ld
+++ b/sys/arch/amd64/conf/link.ld
@@ -32,7 +32,7 @@ SECTIONS
     . += CONSTANT(MAXPAGESIZE);
 
     .data : {
-        *(.data .data.*)
+        *(.data)
     } :data
 
     .bss : {
@@ -40,6 +40,12 @@ SECTIONS
         *(.bss .bss.*)
     } :data
 
+    /* -- Cache line alignment -- */
+    . = ALIGN(64);
+    .data.cacheline_aligned : {
+        *(.data.cacheline_aligned)
+    }
+
     /DISCARD/ : {
         *(.eh_frame)
         *(.note .note.*)
-- 
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