linux-kernel - [PATCH v6 32/37] arm: Implement read

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Message-ID: <20241002094832.24933-33-patrick.rudolph@9elements.com>
Date: Wed,  2 Oct 2024 11:47:23 +0200
From: Patrick Rudolph <patrick.rudolph@...ements.com>
To: u-boot@...ts.denx.de,
	linux-kernel@...r.kernel.org
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
	Tom Rini <trini@...sulko.com>
Subject: [PATCH v6 32/37] arm: Implement read_mpidr on armv7

Implement read_mpidr() on armv7 to make use of it in generic
code that compiles on both armv7 and armv8.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
---
 arch/arm/include/asm/system.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 7e30cac32a..94c6f8f134 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -384,6 +384,15 @@ void switch_to_hypervisor_ret(void);
 #define wfi()
 #endif
 
+static inline unsigned long read_mpidr(void)
+{
+	unsigned long val;
+
+	asm volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (val));
+
+	return val;
+}
+
 static inline unsigned long get_cpsr(void)
 {
 	unsigned long cpsr;
-- 
2.46.2