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arm64/sysreg: Allow a 'Mapping' descriptor for system registers

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*EL02 and *_EL12 system registers are actually only accessors for
EL0 and EL1 registers accessed from EL2 when HCR_EL2.E2H==1. They
do not have fields of their own.

To that effect, introduce a 'Mapping' entry, describing which
system register an _EL12 register maps to.

Implementation wise, this is handled the same was as Fields,
which ls only a comment.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241219173351.1123087-2-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2024-12-19 17:33:47 +00:00 committed by Will Deacon
parent e52163df77
commit 078bc96539
2 changed files with 11 additions and 3 deletions
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2
arch/arm64/tools/gen-sysreg.awk
View File

@ -206,7 +206,7 @@ END {
# Currently this is effectivey a comment, in future we may want to emit
# defines for the fields.
/^Fields/ && block_current() == "Sysreg" {
(/^Fields/ || /^Mapping/) && block_current() == "Sysreg" {
expect_fields(2)
if (next_bit != 63)

12
arch/arm64/tools/sysreg
View File

@ -24,8 +24,16 @@
# ...
# EndEnum
# Alternatively if multiple registers share the same layout then
# a SysregFields block can be used to describe the shared layout
# For VHE aliases (*_EL12, *_EL02) of system registers, a Mapping
# entry describes the register the alias actually accesses:
# Sysreg <name_EL12> <op0> <op1> <crn> <crm> <op2>
# Mapping <name_EL1>
# EndSysreg
# Where multiple system regsiters are not VHE aliases but share a
# common layout, a SysregFields block can be used to describe the
# shared layout:
# SysregFields <fieldsname>
# <field>