[PATCH 01/28] arm64: sysreg: Emit RESx/UNKN values for Mapping definitions

[Marc Zyngier <maz@kernel.org>]

The sysreg file is using the Mapping qualifier to indicate that
a given encoding is only a mapping to a particular register.
As a result, we don't output any definition, and instead expect
the canonical definitions to be used.

This works rather well for individual fields, but creates problems
for macros that refer to more generic classes of bits such as RESx.

Relax the above rule by emitting the RESx and UNKN values for Mapping
qualifiers as well.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/tools/gen-sysreg.awk | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/tools/gen-sysreg.awk b/arch/arm64/tools/gen-sysreg.awk
index 86860ab672dc7..d7f7ceb768fe5 100755
--- a/arch/arm64/tools/gen-sysreg.awk
+++ b/arch/arm64/tools/gen-sysreg.awk
@@ -228,7 +228,7 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 }
 
 # Currently this is effectivey a comment, in future we may want to emit
-# defines for the fields.
+# defines for the fields. "Mapping" does emit the RESx/UNKN definitions.
 ($1 == "Fields" || $1 == "Mapping") && block_current() == "Sysreg" {
 	expect_fields(2)
 
@@ -239,9 +239,15 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 	print ""
 
 	next_bit = -1
-	res0 = null
-	res1 = null
-	unkn = null
+	if ($1 == "Mapping") {
+		res0 = $2 "_RES0"
+		res1 = $2 "_RES1"
+		unkn = $2 "_UNKN"
+	} else {
+		res0 = null
+		res1 = null
+		unkn = null
+	}
 
 	next
 }
-- 
2.47.3