arch.s390x.cpu.skey Module Reference

Functions
auto	arch::s390x::cpu::skey::iske (u64 phys_addr) noexcept -> u8
	Insert Storage Key Extended (ISKE).
constexpr auto	arch::s390x::cpu::skey::make_skey (u8 acc, bool fetch_protect) noexcept -> u8
	Construct a storage key byte from an access-control value and a fetch-protection flag.
auto	arch::s390x::cpu::skey::rrbe (u64 phys_addr) noexcept -> condition_code
	Reset Reference Bit Extended (RRBE).
constexpr auto	arch::s390x::cpu::skey::skey_acc (u8 key) noexcept -> u8
	Extract the 4-bit access-control field from a key byte.
constexpr auto	arch::s390x::cpu::skey::skey_is_changed (u8 key) noexcept -> bool
	Test whether the change bit is set in a key byte.
constexpr auto	arch::s390x::cpu::skey::skey_is_fetch_protected (u8 key) noexcept -> bool
	Test whether the fetch-protection bit is set in a key byte.
constexpr auto	arch::s390x::cpu::skey::skey_is_referenced (u8 key) noexcept -> bool
	Test whether the reference bit is set in a key byte.
auto	arch::s390x::cpu::skey::sske (u64 phys_addr, u8 key) noexcept -> void
	Set Storage Key Extended (SSKE).
auto	arch::s390x::cpu::skey::sske_nq (u64 phys_addr, u8 key) noexcept -> void
	Set Storage Key Extended, non-quiescing form (SSKE with M3=8).
auto	arch::s390x::cpu::skey::sske_preserve_rc (u64 phys_addr, u8 acc, bool fetch_protect) noexcept -> void
	Set the access-control and fetch-protection bits of a frame's storage key.

Variables
constexpr u32	arch::s390x::cpu::skey::PSW_KEY_SHIFT = 52
	PSW key field position within the 64-bit PSW mask word.
constexpr u8	arch::s390x::cpu::skey::SKEY_ACC_MASK = 0xF0
	Access control bits occupy the high nibble of the key byte.
constexpr u8	arch::s390x::cpu::skey::SKEY_ACC_SHIFT = 4
	Shift count to position an access-control value into the key byte.
constexpr u8	arch::s390x::cpu::skey::SKEY_CHANGE = 0x02
	Change bit (PoP bit 6 of the key byte, value 0x02). Set by the CPU when the frame is written.
constexpr u8	arch::s390x::cpu::skey::SKEY_FETCH_PROTECT = 0x08
	Fetch-protection bit (PoP bit 4 of the key byte, value 0x08).
constexpr u8	arch::s390x::cpu::skey::SKEY_REF = 0x04
	Reference bit (PoP bit 5 of the key byte, value 0x04). Set by the CPU when the frame is accessed (read or write).

Files
file	arch/s390x/cpu/skey.cxxm
	z/Architecture storage key operations (SSKE, ISKE, RRBE).