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[U-Boot,v7,1/9] armv8: Add read_mpidr() function

Message ID 1444841757-28043-2-git-send-email-s.temerkhanov@gmail.com
State Accepted
Delegated to: Tom Rini
Headers show

Commit Message

Sergey Temerkhanov Oct. 14, 2015, 4:55 p.m. UTC 
This patch adds the read_mpidr() function which returns the
MPIDR_EL1 register value

Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>

Reviewed-by: Simon Glass <sjg@chromium.org>
---

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 arch/arm/include/asm/system.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Tom Rini Jan. 19, 2016, 10:33 p.m. UTC | #1 
On Wed, Oct 14, 2015 at 09:55:44AM -0700, Sergey Temerkhanov wrote:

> This patch adds the read_mpidr() function which returns the
> MPIDR_EL1 register value
> 
> Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
> Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
> 
> Reviewed-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!
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Patch

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 868ea54..323c43e 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -71,6 +71,17 @@  static inline void set_sctlr(unsigned int val)
 	asm volatile("isb");
 }
 
+static inline unsigned long read_mpidr(void)
+{
+	unsigned long val;
+
+	asm volatile("mrs %0, mpidr_el1" : "=r" (val));
+
+	return val;
+}
+
+#define BSP_COREID	0
+
 void __asm_flush_dcache_all(void);
 void __asm_invalidate_dcache_all(void);
 void __asm_flush_dcache_range(u64 start, u64 end);