class SysReg
Defined at line 37 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h
arch::SysReg() is an object used to access system registers. It's always an
empty object, so it can be constructed afresh for each use. Other classes
can be defined for testing with the same object API.
Public Methods
template <class RegisterTag>auto * Io ()This returns an hwreg "IO provider" pointer that can be passed to
ReadFrom() and WriteTo() methods to access the register identified
by RegisterTag.
Defined at line 43 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h
template <class RegisterTag>auto Read ()This is a shorthand for reading the register into an hwreg::RegisterAddr
object as returned by RegisterTag::Get().
Defined at line 50 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h
template <class RegisterTag, typename T>auto Modify (T && mutate)This is a shorthand for doing Read(), some modifications, and then writing
back. The argument is called with a mutable reference to the object as
returned by Read
<RegisterTag
>(). That object is also returned so it can
be used for additional fluent calls.
Defined at line 59 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h
template <class RegisterTag, typename T>decltype(auto) Write (T && reg)This is a shorthand for writing a register value from an existing
hwreg::RegisterAddr object. It returns the object (or reference) passed
after writing it back to the system register so it can be used for
additional fluent calls.
Defined at line 70 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h
template <class RegisterTag>auto Write (typename RegisterTag::ValueType value)Write
<RegisterTag
> can also be called with a plain integer value to
clobber the register with that value like RegisterTag::Get().FromValue()
before writing it. It returns the hwreg::RegisterAddr object by value.
Defined at line 82 of file ../../zircon/kernel/lib/arch/include/lib/arch/sysreg.h