From 467a2bdf17ad376dafada9f1734784f4611fa6fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jovan=20Dmitrovi=C4=87?= <jovan.dmitrovic@htecgroup.com>
Date: Wed, 11 Jun 2025 10:11:33 +0200
Subject: mips: Implement MIPS HAL and UHI
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Implement abstract interface for MIPS, including unified hosting
interface (UHI).

Signed-off-by: Jovan Dmitrović <jovan.dmitrovic@htecgroup.com>
---
 libgloss/mips/hal/mips_lock_cache.c | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 libgloss/mips/hal/mips_lock_cache.c

(limited to 'libgloss/mips/hal/mips_lock_cache.c')

diff --git a/libgloss/mips/hal/mips_lock_cache.c b/libgloss/mips/hal/mips_lock_cache.c
new file mode 100644
index 0000000..35011ab
--- /dev/null
+++ b/libgloss/mips/hal/mips_lock_cache.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2017-2018 MIPS Tech, LLC
+ *
+ * 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 the copyright holder 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 HOLDER 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.
+*/
+
+#include "cache.h"
+
+/*  
+ * The MIPS32 cache architecture does support per-line cache locking.
+ * If you lock any cache lines, then don't call the mips_flush_cache
+ * routine, because these will flush the locked data out of the cache
+ * too; use only mips_clean_xcache routines.
+*/
+
+/* Load and lock a block of data into the D-cache */
+void __attribute__ ((use_hazard_barrier_return)) _MIPS_HAL_NOMIPS16
+mips_lock_dcache (vaddr_t data, size_t n)
+{
+  /* Calculate cache sizes */
+  mips_size_cache ();
+
+  /* If D-cache is present */
+  if (mips_dcache_linesize > 0)
+    mips_cache_op (data, n, mips_dcache_linesize, Fetch_Lock_D);
+  
+  mips_sync ();
+  return;
+}
+
+/* Load and lock a block of instructions into the I-cache */
+void __attribute__ ((use_hazard_barrier_return)) _MIPS_HAL_NOMIPS16
+mips_lock_icache (vaddr_t code, size_t n)
+{
+  /* Calculate cache sizes */
+  mips_size_cache ();
+
+  /* If I-cache is present */
+  if (mips_icache_linesize > 0)
+    mips_cache_op (code, n, mips_icache_linesize, Fetch_Lock_I);
+  
+  mips_sync ();
+  return;
+}
+
+/* Load and lock a block of data into the L2-cache */
+void __attribute__ ((use_hazard_barrier_return)) _MIPS_HAL_NOMIPS16
+mips_lock_scache (vaddr_t data, size_t n)
+{
+  /* Calculate cache sizes */
+  mips_size_cache ();
+
+  /* If L2-cache is present */
+  if (mips_scache_linesize > 0)
+    mips_cache_op (data, n, mips_scache_linesize, Fetch_Lock_S);
+  
+  mips_sync ();
+  return;
+}
-- 
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