[PATCH v2 04/14] xen/riscv: add <asm/csr.h> header

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

The following changes were made in comparison with <asm/csr.h> from
Linux:
  * remove all defines as they are defined in riscv_encoding.h
  * leave only csr_* macros

Origin: https://github.com/torvalds/linux.git 2475bf0250de
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V2:
  - Minor refactoring mentioned in the commit message, switch tabs to
    spaces and refactor things around __asm__ __volatile__.
  - Update the commit message and add "Origin:" tag.
---
 xen/arch/riscv/include/asm/csr.h | 84 ++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/csr.h

diff --git a/xen/arch/riscv/include/asm/csr.h b/xen/arch/riscv/include/asm/csr.h
new file mode 100644
index 0000000000..4275cf6515
--- /dev/null
+++ b/xen/arch/riscv/include/asm/csr.h
@@ -0,0 +1,84 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2015 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_CSR_H
+#define _ASM_RISCV_CSR_H
+
+#include <asm/asm.h>
+#include <xen/const.h>
+#include <asm/riscv_encoding.h>
+
+#ifndef __ASSEMBLY__
+
+#define csr_read(csr)                                           \
+({                                                              \
+    register unsigned long __v;                                 \
+    __asm__ __volatile__ (  "csrr %0, " __ASM_STR(csr)          \
+                            : "=r" (__v)                        \
+                            : : "memory" );                     \
+    __v;                                                        \
+})
+
+#define csr_write(csr, val)                                     \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrw " __ASM_STR(csr) ", %0"       \
+                            : /* no outputs */                  \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+})
+
+#define csr_swap(csr, val)                                      \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrrw %0, " __ASM_STR(csr) ", %1"  \
+                            : "=r" (__v)                        \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+    __v;                                                        \
+})
+
+#define csr_read_set(csr, val)                                  \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrrs %0, " __ASM_STR(csr) ", %1"  \
+                            : "=r" (__v)                        \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+    __v;                                                        \
+})
+
+#define csr_set(csr, val)                                       \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrs " __ASM_STR(csr) ", %0"       \
+                            : /* no outputs */                  \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+})
+
+#define csr_read_clear(csr, val)                                \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrrc %0, " __ASM_STR(csr) ", %1"  \
+                            : "=r" (__v)                        \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+    __v;                                                        \
+})
+
+#define csr_clear(csr, val)                                     \
+({                                                              \
+    unsigned long __v = (unsigned long)(val);                   \
+    __asm__ __volatile__ (  "csrc " __ASM_STR(csr) ", %0"       \
+                            : /*no outputs */                   \
+                            : "rK" (__v)                        \
+                            : "memory" );                       \
+})
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_RISCV_CSR_H */
-- 
2.39.0