[PATCH v3 30/34] xen/riscv: add minimal stuff to processor.h to build full Xen

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V3:
 - Update the commit message
 - rename get_processor_id to smp_processor_id
 - code style fixes
 - update the cpu_relax instruction: use pause instruction instead of div %0, 
%0, zero
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/processor.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/xen/arch/riscv/include/asm/processor.h 
b/xen/arch/riscv/include/asm/processor.h
index 6db681d805..a3bff6c9c3 100644
--- a/xen/arch/riscv/include/asm/processor.h
+++ b/xen/arch/riscv/include/asm/processor.h
@@ -12,6 +12,9 @@
 
 #ifndef __ASSEMBLY__
 
+/* TODO: need to be implemeted */
+#define smp_processor_id() 0
+
 /* On stack VCPU state */
 struct cpu_user_regs
 {
@@ -53,6 +56,18 @@ struct cpu_user_regs
     unsigned long pregs;
 };
 
+/* TODO: need to implement */
+#define cpu_to_core(cpu)   (0)
+#define cpu_to_socket(cpu) (0)
+
+static inline void cpu_relax(void)
+{
+    /* Encoding of the pause instruction */
+    __asm__ __volatile__ ( ".insn 0x100000F" );
+
+    barrier();
+}
+
 static inline void wfi(void)
 {
     __asm__ __volatile__ ("wfi");
-- 
2.43.0