sh: speculative execution support for SH7780. (45ed285b) · Commits · 戴 / test

arch/sh/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -366,6 +366,16 @@ config SH_STORE_QUEUES
		Selecting this option will enable an in-kernel API for manipulating
		the store queues integrated in the SH-4 processors.

		config SPECULATIVE_EXECUTION
		bool "Speculative subroutine return"
		depends on CPU_SUBTYPE_SH7780 && EXPERIMENTAL
		help
		This enables support for a speculative instruction fetch for
		subroutine return. There are various pitfalls associated with
		this, as outlined in the SH7780 hardware manual.

		If unsure, say N.

		config CPU_HAS_INTEVT
		bool

+19 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,23 @@ __setup("no" __stringify(x), x##_setup);
		onchip_setup(fpu);
		onchip_setup(dsp);

		#ifdef CONFIG_SPECULATIVE_EXECUTION
		#define CPUOPM 0xff2f0000
		#define CPUOPM_RABD (1 << 5)

		static void __init speculative_execution_init(void)
		{
		/* Clear RABD */
		ctrl_outl(ctrl_inl(CPUOPM) & ~CPUOPM_RABD, CPUOPM);

		/* Flush the update */
		(void)ctrl_inl(CPUOPM);
		ctrl_barrier();
		}
		#else
		#define speculative_execution_init() do { } while (0)
		#endif

		/*
		* Generic first-level cache init
		*/
		@@ -261,4 +278,6 @@ asmlinkage void __init sh_cpu_init(void)
		*/
		ubc_wakeup();
		#endif

		speculative_execution_init();
		}