[PATCH v2 01/28] arm64: sysreg: Emit RESx/UNKN values for Mapping/Fields definitions

[Marc Zyngier]

The sysreg file is using the Mapping or Fields qualifiers to indicate
that a given encoding is only a mapping to a particular register (or
an instance of a more generic register definition).

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
and Fields qualifiers as well.

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/tools/gen-sysreg.awk | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/tools/gen-sysreg.awk b/arch/arm64/tools/gen-sysreg.awk
index 86860ab672dc7..e099f7d3b2833 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 +239,9 @@ $1 == "EndSysreg" && block_current() == "Sysreg" {
 	print ""
 
 	next_bit = -1
-	res0 = null
-	res1 = null
-	unkn = null
+	res0 = $2 "_RES0"
+	res1 = $2 "_RES1"
+	unkn = $2 "_UNKN"
 
 	next
 }
-- 
2.47.3