* [PATCH] parisc: Define depi_safe macro
@ 2021-12-21 20:04 John David Anglin
0 siblings, 0 replies; only message in thread
From: John David Anglin @ 2021-12-21 20:04 UTC (permalink / raw)
To: linux-parisc; +Cc: Helge Deller, Deller, James Bottomley
Define depi_safe macro.
The depi instruction is similar to the extru instruction on 64-bit machines. It leaves
the most-significant 32 bits of the target register in an undefined state. On 64-bit
machines, the macro uses depdi to perform safe deposits in the least-significant 32 bits.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
---
diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h
index 6d13ae236fcb..6369082c6c74 100644
--- a/arch/parisc/include/asm/assembly.h
+++ b/arch/parisc/include/asm/assembly.h
@@ -158,6 +158,16 @@
#endif
.endm
+ /* The depi instruction leaves the most significant 32 bits of the
+ * target register in an undefined state on PA 2.0 systems. */
+ .macro depi_safe i, p, len, t
+#ifdef CONFIG_64BIT
+ depdi \i, 32+(\p), \len, \t
+#else
+ depi \i, \p, \len, \t
+#endif
+ .endm
+
/* load 32-bit 'value' into 'reg' compensating for the ldil
* sign-extension when running in wide mode.
* WARNING!! neither 'value' nor 'reg' can be expressions
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2021-12-21 20:04 [PATCH] parisc: Define depi_safe macro John David Anglin
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