riscv: implement ALTERNATIVE_2 macro

When the alternatives were added the commit already provided a template
on how to implement 2 different alternatives for one piece of code.

Make this usable.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Link: https://lore.kernel.org/r/20220511192921.2223629-5-heiko@sntech.deSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/include/asm/alternative-macros.h

@@ -39,6 +39,24 @@
 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
 	__ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k)
 
+.macro __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
+				  new_c_2, vendor_id_2, errata_id_2, enable_2
+886 :
+	\old_c
+887 :
+	ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_1
+	ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2
+.endm
+
+#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					CONFIG_k_1,			\
+				  new_c_2, vendor_id_2, errata_id_2,	\
+					CONFIG_k_2)			\
+	__ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					IS_ENABLED(CONFIG_k_1),		\
+				   new_c_2, vendor_id_2, errata_id_2,	\
+					IS_ENABLED(CONFIG_k_2)
+
 #else /* !__ASSEMBLY__ */
 
 #include <asm/asm.h>
@@ -74,6 +92,25 @@
 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k)	\
 	__ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k))
 
+#define __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					enable_1,			\
+				   new_c_2, vendor_id_2, errata_id_2,	\
+					enable_2)			\
+	"886 :\n"							\
+	old_c "\n"							\
+	"887 :\n"							\
+	ALT_NEW_CONTENT(vendor_id_1, errata_id_1, enable_1, new_c_1)	\
+	ALT_NEW_CONTENT(vendor_id_2, errata_id_2, enable_2, new_c_2)
+
+#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					CONFIG_k_1,			\
+				  new_c_2, vendor_id_2, errata_id_2,	\
+					CONFIG_k_2)			\
+	__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					IS_ENABLED(CONFIG_k_1),		\
+				   new_c_2, vendor_id_2, errata_id_2,	\
+					IS_ENABLED(CONFIG_k_2))
+
 #endif /* __ASSEMBLY__ */
 
 #else /* CONFIG_RISCV_ALTERNATIVE */
@@ -86,6 +123,12 @@
 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
 	__ALTERNATIVE_CFG old_c
 
+#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					CONFIG_k_1,			\
+				  new_c_2, vendor_id_2, errata_id_2,	\
+					CONFIG_k_2)			\
+       __ALTERNATIVE_CFG old_c
+
 #else /* !__ASSEMBLY__ */
 
 #define __ALTERNATIVE_CFG(old_c)  \
@@ -94,6 +137,12 @@
 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
 	__ALTERNATIVE_CFG(old_c)
 
+#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
+					CONFIG_k_1,			\
+				  new_c_2, vendor_id_2, errata_id_2,	\
+					CONFIG_k_2) \
+       __ALTERNATIVE_CFG(old_c)
+
 #endif /* __ASSEMBLY__ */
 #endif /* CONFIG_RISCV_ALTERNATIVE */
 
@@ -119,25 +168,14 @@
  * this case, this vendor can create a new macro ALTERNATIVE_2() based
  * on the following sample code and then replace ALTERNATIVE() with
  * ALTERNATIVE_2() to append its customized content.
- *
- * .macro __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
- *                                   new_c_2, vendor_id_2, errata_id_2, enable_2
- * 886 :
- *      \old_c
- * 887 :
- *      ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_1
- *      ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2
- * .endm
- *
- * #define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
- *                                   new_c_2, vendor_id_2, errata_id_2, CONFIG_k_2) \
- *        __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, IS_ENABLED(CONFIG_k_1), \
- *                                   new_c_2, vendor_id_2, errata_id_2, IS_ENABLED(CONFIG_k_2) \
- *
- * #define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
- *                                    new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) \
- *         _ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
- *                                         new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2)
- *
  */
+#define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1,		\
+					errata_id_1, CONFIG_k_1,	\
+				   new_content_2, vendor_id_2,		\
+					errata_id_2, CONFIG_k_2)	\
+	_ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1,	\
+					    errata_id_1, CONFIG_k_1,	\
+					new_content_2, vendor_id_2,	\
+					    errata_id_2, CONFIG_k_2)
+
 #endif