[RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI.

[Atish Patra <atish.patra@wdc.com>]

As per the new SBI specification, current SBI implementation is
defined as legacy and will be removed/replaced in future.

Rename existing implementation to reflect that. This patch is just
a preparatory patch for SBI v0.2 and doesn't introduce any functional
changes.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/include/asm/sbi.h | 61 +++++++++++++++++++-----------------
 1 file changed, 33 insertions(+), 28 deletions(-)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 21134b3ef404..7f5ecaaaa0d7 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -8,17 +8,18 @@
 
 #include <linux/types.h>
 
-#define SBI_SET_TIMER 0
-#define SBI_CONSOLE_PUTCHAR 1
-#define SBI_CONSOLE_GETCHAR 2
-#define SBI_CLEAR_IPI 3
-#define SBI_SEND_IPI 4
-#define SBI_REMOTE_FENCE_I 5
-#define SBI_REMOTE_SFENCE_VMA 6
-#define SBI_REMOTE_SFENCE_VMA_ASID 7
-#define SBI_SHUTDOWN 8
-
-#define SBI_CALL(which, arg0, arg1, arg2, arg3) ({		\
+
+#define SBI_EXT_LEGACY_SET_TIMER 0x0
+#define SBI_EXT_LEGACY_CONSOLE_PUTCHAR 0x1
+#define SBI_EXT_LEGACY_CONSOLE_GETCHAR 0x2
+#define SBI_EXT_LEGACY_CLEAR_IPI 0x3
+#define SBI_EXT_LEGACY_SEND_IPI 0x4
+#define SBI_EXT_LEGACY_REMOTE_FENCE_I 0x5
+#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA 0x6
+#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID 0x7
+#define SBI_EXT_LEGACY_SHUTDOWN 0x8
+
+#define SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) ({             \
 	register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);	\
 	register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);	\
 	register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);	\
@@ -32,58 +33,61 @@
 })
 
 /* Lazy implementations until SBI is finalized */
-#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0)
-#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0)
-#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0, 0)
-#define SBI_CALL_3(which, arg0, arg1, arg2) \
-		SBI_CALL(which, arg0, arg1, arg2, 0)
-#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \
-		SBI_CALL(which, arg0, arg1, arg2, arg3)
+#define SBI_CALL_LEGACY_0(which) SBI_CALL_LEGACY(which, 0, 0, 0, 0)
+#define SBI_CALL_LEGACY_1(which, arg0) SBI_CALL_LEGACY(which, arg0, 0, 0, 0)
+#define SBI_CALL_LEGACY_2(which, arg0, arg1) \
+		SBI_CALL_LEGACY(which, arg0, arg1, 0, 0)
+#define SBI_CALL_LEGACY_3(which, arg0, arg1, arg2) \
+		SBI_CALL_LEGACY(which, arg0, arg1, arg2, 0)
+#define SBI_CALL_LEGACY_4(which, arg0, arg1, arg2, arg3) \
+		SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3)
 
 static inline void sbi_console_putchar(int ch)
 {
-	SBI_CALL_1(SBI_CONSOLE_PUTCHAR, ch);
+	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_CONSOLE_PUTCHAR, ch);
 }
 
 static inline int sbi_console_getchar(void)
 {
-	return SBI_CALL_0(SBI_CONSOLE_GETCHAR);
+	return SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CONSOLE_GETCHAR);
 }
 
 static inline void sbi_set_timer(uint64_t stime_value)
 {
 #if __riscv_xlen == 32
-	SBI_CALL_2(SBI_SET_TIMER, stime_value, stime_value >> 32);
+	SBI_CALL_LEGACY_2(SBI_EXT_LEGACY_SET_TIMER, stime_value,
+			  stime_value >> 32);
 #else
-	SBI_CALL_1(SBI_SET_TIMER, stime_value);
+	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SET_TIMER, stime_value);
 #endif
 }
 
 static inline void sbi_shutdown(void)
 {
-	SBI_CALL_0(SBI_SHUTDOWN);
+	SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_SHUTDOWN);
 }
 
 static inline void sbi_clear_ipi(void)
 {
-	SBI_CALL_0(SBI_CLEAR_IPI);
+	SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CLEAR_IPI);
 }
 
 static inline void sbi_send_ipi(const unsigned long *hart_mask)
 {
-	SBI_CALL_1(SBI_SEND_IPI, hart_mask);
+	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SEND_IPI, hart_mask);
 }
 
 static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
 {
-	SBI_CALL_1(SBI_REMOTE_FENCE_I, hart_mask);
+	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_REMOTE_FENCE_I, hart_mask);
 }
 
 static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
 					 unsigned long start,
 					 unsigned long size)
 {
-	SBI_CALL_3(SBI_REMOTE_SFENCE_VMA, hart_mask, start, size);
+	SBI_CALL_LEGACY_3(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA, hart_mask,
+			  start, size);
 }
 
 static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
@@ -91,7 +95,8 @@ static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
 					      unsigned long size,
 					      unsigned long asid)
 {
-	SBI_CALL_4(SBI_REMOTE_SFENCE_VMA_ASID, hart_mask, start, size, asid);
+	SBI_CALL_LEGACY_4(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID, hart_mask,
+			  start, size, asid);
 }
 
 #endif
-- 
2.21.0