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[v1,49/57] xen/riscv: add minimal stuff to asm/processor.h to build full Xen

Message ID 49fc04992808963a17321e4f34b8310a4b3077fb.1692181079.git.oleksii.kurochko@gmail.com (mailing list archive)
State New, archived
Headers show
Series Enable build of full Xen for RISC-V | expand

Commit Message

Oleksii Kurochko Aug. 16, 2023, 10:20 a.m. UTC 
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
---
 xen/arch/riscv/include/asm/processor.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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Patch

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");