Messages in this thread Patch in this message | | | From | Andrea della Porta <> | Subject | [PATCH v2 1/4] arm64: Introduce aarch32_enabled() | Date | Mon, 23 Oct 2023 16:42:20 +0200 |
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Aarch32 bit support on 64bit kernels depends on whether CONFIG_COMPAT is selected or not. As it is a compile time option it doesn't provide the flexibility to have distributions set their own policy for Aarch32 support and give the user the flexibility to override it.
As a first step introduce aarch32_enabled() which abstracts whether 32 bit compat is turned on or off. Upcoming patches will implement the ability to set Aarch32 compat state at boot time.
Signed-off-by: Andrea della Porta <andrea.porta@suse.com> --- arch/arm64/include/asm/cpufeature.h | 15 +++++++++++++++ arch/arm64/kernel/entry-common.c | 2 ++ 2 files changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 396af9b9c857..1180d68daaff 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -657,6 +657,21 @@ static inline bool supports_clearbhb(int scope) ID_AA64ISAR2_EL1_CLRBHB_SHIFT); } +#ifdef CONFIG_COMPAT +extern bool __aarch32_enabled; + +static inline bool aarch32_enabled(void) +{ + return __aarch32_enabled; +} +#else /* !CONFIG_COMPAT */ + +static inline bool aarch32_enabled(void) +{ + return false; +} +#endif + const struct cpumask *system_32bit_el0_cpumask(void); DECLARE_STATIC_KEY_FALSE(arm64_mismatched_32bit_el0); diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 0fc94207e69a..69ff9b8c0bde 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -877,6 +877,8 @@ asmlinkage void noinstr el0t_32_error_handler(struct pt_regs *regs) { __el0_error_handler_common(regs); } + +bool __aarch32_enabled __ro_after_init = true; #else /* CONFIG_COMPAT */ UNHANDLED(el0t, 32, sync) UNHANDLED(el0t, 32, irq) -- 2.35.3
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