arm64: Add sysreg header generation scripting · Pull Request !2736 · openEuler/kernel

PR sync from: Junhao He <hejunhao3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/JZ3ABW35Y4TSWBNGZTVMV47TR4S63ISO/ 
The arm64 kernel requires some metadata for each system register it may
need to access. Currently we have:

* A SYS_<regname> definition which sorresponds to a sys_reg() macro.
  This is used both to look up a sysreg by encoding (e.g. in KVM), and
  also to generate code to access a sysreg where the assembler is
  unaware of the specific sysreg encoding.

Where assemblers support the S3_<op1>_C<crn>_C<crm>_<op2> syntax for
  system registers, we could use this rather than manually assembling
  the instructions. However, we don't have consistent definitions for
  these and we currently still need to handle toolchains that lack this
  feature.

* A set of <regname>_<fieldname>_SHIFT and <regname>_<fieldname>_MASK
  definitions, which can be used to extract fields from the register, or
  to construct a register from a set of fields.

These do not follow the convention used by <linux/bitfield.h>, and the
  masks are not shifted into place, preventing their use in FIELD_PREP()
  and FIELD_GET(). We require the SHIFT definitions for inline assembly
  (and WIDTH definitions would be helpful for UBFX/SBFX), so we cannot
  only define a shifted MASK. Defining a SHIFT, WIDTH, shifted MASK and
  unshifted MASK is tedious and error-prone and life is much easier when
  they can be relied up to exist when writing code.

* A set of <regname>_<fieldname>_<valname> definitions for each
  enumerated value a field may hold. These are used when identifying the
  presence of features.

Atop of this, other code has to build up metadata at runtime (e.g. the
sets of RES0/RES1 bits in a register).

Alejandro Tafalla (1):
  arm64/sysreg: Fix typo in Enum element regex

James Morse (1):
  arm64/sysreg: Extend the maximum width of a register and symbol name

Marc Zyngier (1):
  arm64: Allow the definition of UNKNOWN system register fields

Mark Brown (6):
  arm64/sysreg: Enable automatic generation of system register
    definitions
  arm64/sysreg: Introduce helpers for access to sysreg fields
  arm64/sysreg: Add SYS_FIELD_GET() helper
  arm64/sysreg: Support generation of RAZ fields
  arm64/sysreg: Allow leading blanks on comments in sysreg file
  arm64/sysreg: Allow enumerations to be declared as signed or unsigned

Mark Rutland (4):
  arm64: Add sysreg header generation scripting
  arm64/sysreg: improve comment for regs without fields
  arm64/sysreg: fix odd line spacing
  arm64/sysreg: allow *Enum blocks in SysregFields blocks

-- 
2.33.0
 
https://gitee.com/openeuler/kernel/issues/I8DFTV

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