[PATCH 1/3] kvx: Add missing include/asm/mmu.h

oss at kalray.eu oss at kalray.eu
Tue Jun 27 08:42:00 PDT 2023

From: Jules Maselbas <jmaselbas at kalray.eu>

Since the rework of remap_range each architecture is expected to have
the asm/mmu.h header, this wasn't the case for kvx, fix this.

By default the KV3-1 cpu (as found in Coolidge SoC) starts with all memory
uncached and MMU disabled. Data and instruction L1-caches are enabled very
early during barebox start code, see arch/kvx/cpu/start.S, using the wfxl
instruction to modify DCE and ICE (resp. Data and Instruction Cache Enable)
bits in PS (Processor Status) of the system register file.

The core MMU is not used by barebox, however there is a default mapping of
the memory when the MMU is disabled where only the SMEM and DDR memory are
cached and device-memory isn't.

Fixes b792124a7d ("rework remap_range")

Signed-off-by: Jules Maselbas <jmaselbas at kalray.eu>
 arch/kvx/include/asm/mmu.h | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 arch/kvx/include/asm/mmu.h

diff --git a/arch/kvx/include/asm/mmu.h b/arch/kvx/include/asm/mmu.h
new file mode 100644
index 0000000000..d39889bd3f
--- /dev/null
+++ b/arch/kvx/include/asm/mmu.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_MMU_H
+#define __ASM_MMU_H
+#endif /* __ASM_MMU_H */

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