include/asm/cpufeature.h

122  * Each capability has the following list of attributes :
124  * 1) Scope of Detection : The system detects a given capability by
127  *    model. The capability provides a call back ( @matches() ) to
134  *        capability is finalised. (See section 2 below)
138  *        system decides to finalise the state of the capability. If the
139  *        capability relies on a field in one of the CPU ID feature
148  *    The process of detection is usually denoted by "update" capability
152  *    capability at some point during its execution and take necessary
159  *    changes to the state of a capability once it finalises the capability
161  *    safely. A CPU brought up after a capability is "finalised" is
162  *    referred to as "Late CPU" w.r.t the capability. e.g, all secondary
183  *	a) SCOPE_BOOT_CPU : All CPUs are verified against the capability
187  *	user after the kernel boot are verified against the capability.
192  *    capability, if it has not been finalised already. See section 5
196  *    detected capability, on all CPUs on the system. Appropriate actions
200  *    point. The actions are always initiated only after the capability
201  *    is finalised. This is usally denoted by "enabling" the capability.
203  *	a) Action is triggered on all online CPUs, after the capability is
211  * 5) Conflicts: Based on the state of the capability on a late CPU vs.
227  *     Case (a) is not permitted for a capability that the system requires
228  *     all CPUs to have in order for the capability to be enabled. This is
231  *     Case (b) is not permitted for a capability that must be enabled
234  *     enabled after the corresponding capability is finalised.
238  *     or both flags in the capability's type field.
241  *     ARM64_CPUCAP_PANIC_ON_CONFLICT flag is specified for the capability,
247  * Decide how the capability is detected.
254  * during early boot. i.e, the capability should be "detected" and
269  * Is it permitted for a late CPU to have this capability when system
273 /* Is it safe for a late CPU to miss this capability when system has it */
300  * capability to be advertised by cpus_have_*cap()!
309  * is not allowed to have the capability when the system doesn't have it.
318  * CPUs must match the state of the capability as detected by the boot CPU. In
335 	u16 capability;  member
339 	 * Take the appropriate actions to configure this capability
340 	 * for this CPU. If the capability is detected by the kernel
343 	 * capability is available on that specific CPU. This is
347 	 * is required only if the CPU has the capability, then the
374 	 * "capability" of the same "type" as described by the parent.
394  * of call backs, sharing the same capability bit.
454  * Test for a capability with a runtime check.
456  * Before the capability is detected, this returns false.
468  * Test for a capability without a runtime check.
485  * Test for a capability without a runtime check.