powerpc/8xx: Create C version of kuap save/restore/check helpers
In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_save_and_lock() and kuap_user_restore() and kuap_kernel_restore() and kuap_assert_locked() and kuap_get_and_assert_locked() on 8xx. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156a7c4b669d26785391422a5581a1d919544c9a.1615552867.git.christophe.leroy@csgroup.eu
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@ -34,6 +34,37 @@
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#include <asm/reg.h>
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#include <asm/reg.h>
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static inline void kuap_save_and_lock(struct pt_regs *regs)
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{
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regs->kuap = mfspr(SPRN_MD_AP);
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mtspr(SPRN_MD_AP, MD_APG_KUAP);
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}
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static inline void kuap_user_restore(struct pt_regs *regs)
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{
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}
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static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
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{
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mtspr(SPRN_MD_AP, regs->kuap);
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}
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static inline unsigned long kuap_get_and_assert_locked(void)
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{
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unsigned long kuap = mfspr(SPRN_MD_AP);
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16);
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return kuap;
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}
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static inline void kuap_assert_locked(void)
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{
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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kuap_get_and_assert_locked();
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}
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static inline void allow_user_access(void __user *to, const void __user *from,
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static inline void allow_user_access(void __user *to, const void __user *from,
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unsigned long size, unsigned long dir)
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unsigned long size, unsigned long dir)
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{
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{
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