90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_KUP_8XX_H_
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#define _ASM_POWERPC_KUP_8XX_H_
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#include <asm/bug.h>
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#include <asm/mmu.h>
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#ifdef CONFIG_PPC_KUAP
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#ifndef __ASSEMBLY__
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#include <asm/reg.h>
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static __always_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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#define __kuap_save_and_lock __kuap_save_and_lock
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static __always_inline void kuap_user_restore(struct pt_regs *regs)
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{
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}
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static __always_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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#ifdef CONFIG_PPC_KUAP_DEBUG
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static __always_inline unsigned long __kuap_get_and_assert_locked(void)
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{
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WARN_ON_ONCE(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16);
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return 0;
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}
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#define __kuap_get_and_assert_locked __kuap_get_and_assert_locked
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#endif
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static __always_inline void uaccess_begin_8xx(unsigned long val)
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{
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asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : :
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"i"(SPRN_MD_AP), "r"(val), "i"(MMU_FTR_KUAP) : "memory");
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}
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static __always_inline void uaccess_end_8xx(void)
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{
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asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : :
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"i"(SPRN_MD_AP), "r"(MD_APG_KUAP), "i"(MMU_FTR_KUAP) : "memory");
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}
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static __always_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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{
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uaccess_begin_8xx(MD_APG_INIT);
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}
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static __always_inline void prevent_user_access(unsigned long dir)
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{
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uaccess_end_8xx();
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}
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static __always_inline unsigned long prevent_user_access_return(void)
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{
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unsigned long flags;
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flags = mfspr(SPRN_MD_AP);
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uaccess_end_8xx();
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return flags;
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}
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static __always_inline void restore_user_access(unsigned long flags)
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{
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uaccess_begin_8xx(flags);
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}
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static __always_inline bool
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__bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
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{
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return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* CONFIG_PPC_KUAP */
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#endif /* _ASM_POWERPC_KUP_8XX_H_ */
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