[PATCH v4 1/7] riscv: asm: alternative-macros: Introduce ALTERNATIVE_3() macro

Prabhakar
2022-11-24T17:23:15Z

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Introduce ALTERNATIVE_3() macro.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
RFC v3 -> v4
* New patch
---
arch/riscv/include/asm/alternative-macros.h | 94 +++++++++++++++++++++
1 file changed, 94 insertions(+)

diff --git a/arch/riscv/include/asm/alternative-macros.h b/arch/riscv/include/asm/alternative-macros.h
index ec2f3f1b836f..1caf4306b3d6 100644
--- a/arch/riscv/include/asm/alternative-macros.h
+++ b/arch/riscv/include/asm/alternative-macros.h
@@ -69,6 +69,34 @@
new_c_2, vendor_id_2, errata_id_2, \
IS_ENABLED(CONFIG_k_2)

+.macro __ALTERNATIVE_CFG_3 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
+ new_c_2, vendor_id_2, errata_id_2, enable_2, \
+ new_c_3, vendor_id_3, errata_id_3, enable_3
+886 :
+ .option push
+ .option norvc
+ .option norelax
+ \old_c
+ .option pop
+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
+ ALT_NEW_CONTENT \vendor_id_3, \errata_id_3, \enable_3, \new_c_3
+.endm
+
+#define _ALTERNATIVE_CFG_3(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, \
+ new_c_3, vendor_id_3, errata_id_3, \
+ CONFIG_k_3) \
+ __ALTERNATIVE_CFG_3 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), \
+ new_c_3, vendor_id_3, errata_id_3, \
+ IS_ENABLED(CONFIG_k_3)
+
#else /* !__ASSEMBLY__ */

#include <asm/asm.h>
@@ -135,6 +163,36 @@
new_c_2, vendor_id_2, errata_id_2, \
IS_ENABLED(CONFIG_k_2))

+#define __ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, errata_id_1, \
+ enable_1, \
+ new_c_2, vendor_id_2, errata_id_2, \
+ enable_2, \
+ new_c_3, vendor_id_3, errata_id_3, \
+ enable_3) \
+ "886 :\n" \
+ ".option push\n" \
+ ".option norvc\n" \
+ ".option norelax\n" \
+ old_c "\n" \
+ ".option pop\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) \
+ ALT_NEW_CONTENT(vendor_id_3, errata_id_3, enable_3, new_c_3)
+
+#define _ALTERNATIVE_CFG_3(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, \
+ new_c_3, vendor_id_3, errata_id_3, \
+ CONFIG_k_3) \
+ __ALTERNATIVE_CFG_3(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), \
+ new_c_3, vendor_id_3, errata_id_3, \
+ IS_ENABLED(CONFIG_k_3))
+
#endif /* __ASSEMBLY__ */

#else /* CONFIG_RISCV_ALTERNATIVE */
@@ -153,6 +211,14 @@
CONFIG_k_2) \
__ALTERNATIVE_CFG old_c

+#define _ALTERNATIVE_CFG_3(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, \
+ new_c_3, vendor_id_3, errata_id_3, \
+ CONFIG_k_3) \
+ __ALTERNATIVE_CFG old_c
+
#else /* !__ASSEMBLY__ */

#define __ALTERNATIVE_CFG(old_c) \
@@ -167,6 +233,14 @@
CONFIG_k_2) \
__ALTERNATIVE_CFG(old_c)

+#define _ALTERNATIVE_CFG_3(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, \
+ new_c_3, vendor_id_3, errata_id_3, \
+ CONFIG_k_3) \
+ __ALTERNATIVE_CFG(old_c)
+
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_RISCV_ALTERNATIVE */

@@ -202,4 +276,24 @@
new_content_2, vendor_id_2, \
errata_id_2, CONFIG_k_2)

+/*
+ * A vendor wants to replace an old_content, but another vendor has used
+ * ALTERNATIVE_2() to patch its customized content at the same location. In
+ * this case, this vendor can create a new macro ALTERNATIVE_3() based
+ * on the following sample code and then replace ALTERNATIVE_2() with
+ * ALTERNATIVE_3() to append its customized content.
+ */
+#define ALTERNATIVE_3(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, \
+ new_content_3, vendor_id_3, \
+ errata_id_3, CONFIG_k_3) \
+ _ALTERNATIVE_CFG_3(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, \
+ new_content_3, vendor_id_3, \
+ errata_id_3, CONFIG_k_3)
+
#endif
--
2.25.1