Commit 078bc965 authored by Marc Zyngier's avatar Marc Zyngier Committed by Will Deacon
Browse files

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



*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: default avatarMark Rutland <mark.rutland@arm.com>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241219173351.1123087-2-maz@kernel.org


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent e52163df

arch/arm64/tools/gen-sysreg.awk

+1 −1
Original line number Diff line number Diff line
@@ -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)

arch/arm64/tools/sysreg

+10 −2
Original line number Diff line number Diff line
@@ -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>