zephyr: lib/cpu.h: remove dependency to platform layer

Remove dependency to platform cpu.h layer for Zephyr targets. The lib/cpu.h is now common to all SOF targets when building for Zephyr. Add a note to PLATFORM_PRIMARY_CORE_ID documentation that "primary core" is a SOF/application convention and not visible in Zephyr OS interfaces. Core 0 is the boot core in Zephyr, so use this definition as PLATFORM_PRIMARY_CORE_ID for all SOF targets. This was already the case in all platform definitions, so no functional change. In SOF, the primary/secondary distinction is primarily used in IPC code, together with Zephyr CONFIG_SMP_BOOT_DELAY=y. Signed-off-by: Kai Vehmanen <[email protected]>
thesofproject · Nov 12, 2024 · 198c718 · 198c718
1 parent 7303db2
commit 198c718
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/zephyr/include/sof/lib/cpu.h b/zephyr/include/sof/lib/cpu.h
@@ -14,7 +14,15 @@
 #ifndef __SOF_LIB_CPU_H__
 #define __SOF_LIB_CPU_H__
 
-#include <platform/lib/cpu.h>
+/**
+ * \brief Id of primary DSP core
+ *
+ * SOF IPC protocols make a distinction between primary
+ * and secondary cores. In Zephyr, primary core id concept
+ * is not present in public OS interface, but in implementation
+ * zero is the boot core (see z_smp_init() in Zephyr).
+ */
+#define PLATFORM_PRIMARY_CORE_ID	0
 
 #if !defined(__ASSEMBLER__) && !defined(LINKER)