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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_POWERPC_KUP_8XX_H_ #define _ASM_POWERPC_KUP_8XX_H_ #include <asm/bug.h> #include <asm/mmu.h> #ifdef CONFIG_PPC_KUAP #ifndef __ASSEMBLY__ #include <linux/jump_label.h> #include <asm/reg.h> extern struct static_key_false disable_kuap_key; static __always_inline bool kuap_is_disabled(void) { return static_branch_unlikely(&disable_kuap_key); } static inline void kuap_save_and_lock(struct pt_regs *regs) { if (kuap_is_disabled()) return; regs->kuap = mfspr(SPRN_MD_AP); mtspr(SPRN_MD_AP, MD_APG_KUAP); } static inline void kuap_user_restore(struct pt_regs *regs) { } static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap) { if (kuap_is_disabled()) return; mtspr(SPRN_MD_AP, regs->kuap); } static inline unsigned long kuap_get_and_assert_locked(void) { unsigned long kuap; if (kuap_is_disabled()) return MD_APG_INIT; kuap = mfspr(SPRN_MD_AP); if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16); return kuap; } static inline void kuap_assert_locked(void) { if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && !kuap_is_disabled()) kuap_get_and_assert_locked(); } static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { if (kuap_is_disabled()) return; mtspr(SPRN_MD_AP, MD_APG_INIT); } static inline void prevent_user_access(unsigned long dir) { if (kuap_is_disabled()) return; mtspr(SPRN_MD_AP, MD_APG_KUAP); } static inline unsigned long prevent_user_access_return(void) { unsigned long flags; if (kuap_is_disabled()) return MD_APG_INIT; flags = mfspr(SPRN_MD_AP); mtspr(SPRN_MD_AP, MD_APG_KUAP); return flags; } static inline void restore_user_access(unsigned long flags) { if (kuap_is_disabled()) return; mtspr(SPRN_MD_AP, flags); } static inline bool bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) { if (kuap_is_disabled()) return false; return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000); } #endif /* !__ASSEMBLY__ */ #endif /* CONFIG_PPC_KUAP */ #endif /* _ASM_POWERPC_KUP_8XX_H_ */
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