[PATCH v2 04/39] xen/riscv: add public arch-riscv.h

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V2:
    - align with arch-arm.h.
---

 xen/include/public/arch-riscv.h | 93 +++++++++++++++++++++++++++++++++
 xen/include/public/xen.h        |  2 +
 2 files changed, 95 insertions(+)
 create mode 100644 xen/include/public/arch-riscv.h

diff --git a/xen/include/public/arch-riscv.h b/xen/include/public/arch-riscv.h
new file mode 100644
index 0000000000..168263b920
--- /dev/null
+++ b/xen/include/public/arch-riscv.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Guest OS interface to RISC-V Xen.
+ * Initially based on the ARM implementation.
+ */
+
+#ifndef __XEN_PUBLIC_ARCH_RISCV_H__
+#define __XEN_PUBLIC_ARCH_RISCV_H__
+
+#if defined(__XEN__) || defined(__XEN_TOOLS__) || defined(__GNUC__)
+#define  int64_aligned_t  int64_t __attribute__((__aligned__(8)))
+#define uint64_aligned_t uint64_t __attribute__((__aligned__(8)))
+#endif
+
+#ifndef __ASSEMBLY__
+#define ___DEFINE_XEN_GUEST_HANDLE(name, type)                  \
+    typedef union { type *p; unsigned long q; }                 \
+        __guest_handle_ ## name;                                \
+    typedef union { type *p; uint64_aligned_t q; }              \
+        __guest_handle_64_ ## name
+
+/*
+ * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
+ * in a struct in memory. On RISCV is always 8 bytes sizes and 8 bytes
+ * aligned.
+ * XEN_GUEST_HANDLE_PARAM represents a guest pointer, when passed as an
+ * hypercall argument. It is 4 bytes on riscv32 and 8 bytes on riscv64.
+ */
+#define __DEFINE_XEN_GUEST_HANDLE(name, type) \
+    ___DEFINE_XEN_GUEST_HANDLE(name, type);   \
+    ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
+#define DEFINE_XEN_GUEST_HANDLE(name)   __DEFINE_XEN_GUEST_HANDLE(name, name)
+#define __XEN_GUEST_HANDLE(name)        __guest_handle_64_ ## name
+#define XEN_GUEST_HANDLE(name)          __XEN_GUEST_HANDLE(name)
+#define XEN_GUEST_HANDLE_PARAM(name)    __guest_handle_ ## name
+#define set_xen_guest_handle_raw(hnd, val)                  \
+    do {                                                    \
+        typeof(&(hnd)) sxghr_tmp_ = &(hnd);                 \
+        sxghr_tmp_->q = 0;                                  \
+        sxghr_tmp_->p = (val);                              \
+    } while ( 0 )
+#define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
+
+typedef uint64_t xen_pfn_t;
+#define PRI_xen_pfn PRIx64
+#define PRIu_xen_pfn PRIu64
+
+typedef uint64_t xen_ulong_t;
+#define PRI_xen_ulong PRIx64
+
+#if defined(__XEN__) || defined(__XEN_TOOLS__)
+
+struct vcpu_guest_context {
+};
+typedef struct vcpu_guest_context vcpu_guest_context_t;
+DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
+
+struct xen_arch_domainconfig {
+};
+
+#endif
+
+/* TODO:  add a placeholder entry if no real ones surface */
+struct arch_vcpu_info {
+};
+typedef struct arch_vcpu_info arch_vcpu_info_t;
+
+/* TODO:  add a placeholder entry if no real ones surface */
+struct arch_shared_info {
+};
+typedef struct arch_shared_info arch_shared_info_t;
+
+/*
+ * Maximum number of virtual CPUs in legacy multi-processor guests.
+ * Only one. All other VCPUS must use VCPUOP_register_vcpu_info.
+ */
+#define XEN_LEGACY_MAX_VCPUS 1
+
+/* Stub definition of PMU structure */
+typedef struct xen_pmu_arch { uint8_t dummy; } xen_pmu_arch_t;
+#endif
+
+#endif /*  __XEN_PUBLIC_ARCH_RISCV_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index b812a0a324..b47d48d0e2 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -18,6 +18,8 @@
 #include "arch-arm.h"
 #elif defined(__powerpc64__)
 #include "arch-ppc.h"
+#elif defined(__riscv)
+#include "arch-riscv.h"
 #else
 #error "Unsupported architecture"
 #endif
-- 
2.42.0