[PATCH v3 28/34] xen/riscv: add required things to current.h

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Add minimal requied things to be able to build full Xen.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V3:
 - add SPDX
 - drop a forward declaration of struct vcpu;
 - update guest_cpu_user_regs() macros
 - replace get_processor_id with smp_processor_id
 - update the commit message
 - code style fixes
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/current.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/xen/arch/riscv/include/asm/current.h 
b/xen/arch/riscv/include/asm/current.h
index d84f15dc50..1694f68c6f 100644
--- a/xen/arch/riscv/include/asm/current.h
+++ b/xen/arch/riscv/include/asm/current.h
@@ -3,6 +3,21 @@
 #ifndef __ASM_CURRENT_H
 #define __ASM_CURRENT_H
 
+#include <xen/bug.h>
+#include <xen/percpu.h>
+#include <asm/processor.h>
+
+#ifndef __ASSEMBLY__
+
+/* Which VCPU is "current" on this PCPU. */
+DECLARE_PER_CPU(struct vcpu *, curr_vcpu);
+
+#define current            this_cpu(curr_vcpu)
+#define set_current(vcpu)  do { current = (vcpu); } while (0)
+#define get_cpu_current(cpu)  per_cpu(curr_vcpu, cpu)
+
+#define guest_cpu_user_regs() ({ BUG(); NULL; })
+
 #define switch_stack_and_jump(stack, fn) do {               \
     asm volatile (                                          \
             "mv sp, %0\n"                                   \
@@ -10,4 +25,8 @@
     unreachable();                                          \
 } while ( false )
 
+#define get_per_cpu_offset() __per_cpu_offset[smp_processor_id()]
+
+#endif /* __ASSEMBLY__ */
+
 #endif /* __ASM_CURRENT_H */
-- 
2.43.0