[PATCH v6 32/37] arm: Implement read_mpidr on armv7

Patrick Rudolph
2024-10-02T09:57:47Z

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@9elements.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