linux-kernel - [PATCH 38/43] MN10300: Specify an ELF HWCAP flag for MN10300 Atomic Operations Unit support

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Date:	Tue, 26 Oct 2010 03:56:24 +0100
From:	David Howells <dhowells@...hat.com>
To:	linux-am33-list@...hat.com
Cc:	linux-kernel@...r.kernel.org, Mark Salter <msalter@...hat.com>
Subject: [PATCH 38/43] MN10300: Specify an ELF HWCAP flag for MN10300 Atomic
 Operations Unit support

From: Mark Salter <msalter@...hat.com>

Use an ELF HWCAP flag to indicate to the process that the CPU provides LL/SC
equivalent atomic operations unit support in addition to BSET/BCLR.

Signed-off-by: Mark Salter <msalter@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 arch/mn10300/include/asm/elf.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)


diff --git a/arch/mn10300/include/asm/elf.h b/arch/mn10300/include/asm/elf.h
index a30d220..8157c92 100644
--- a/arch/mn10300/include/asm/elf.h
+++ b/arch/mn10300/include/asm/elf.h
@@ -32,6 +32,12 @@
 #define R_MN10300_ALIGN 	34	/* Alignment requirement. */
 
 /*
+ * AM33/AM34 HW Capabilities
+ */
+#define HWCAP_MN10300_ATOMIC_OP_UNIT	1	/* Has AM34 Atomic Operations */
+
+
+/*
  * ELF register definitions..
  */
 typedef unsigned long elf_greg_t;
@@ -128,7 +134,11 @@ do {						\
  * instruction set this CPU supports.  This could be done in user space,
  * but it's not easy, and we've already done it here.
  */
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+#define ELF_HWCAP	(HWCAP_MN10300_ATOMIC_OP_UNIT)
+#else
 #define ELF_HWCAP	(0)
+#endif
 
 /*
  * This yields a string that ld.so will use to load implementation

--
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