[PATCH v2 33/39] xen/riscv: add minimal stuff to asm/processor.h to build full Xen

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
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..b6218a00a7 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 get_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)
+{
+       int dummy;
+       /* In lieu of a halt instruction, induce a long-latency stall. */
+       __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
+       barrier();
+}
+
 static inline void wfi(void)
 {
     __asm__ __volatile__ ("wfi");
-- 
2.42.0