1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_POWERPC_KUP_8XX_H_ 3#define _ASM_POWERPC_KUP_8XX_H_ 4 5#include <asm/bug.h> 6#include <asm/mmu.h> 7 8#ifdef CONFIG_PPC_KUAP 9 10#ifndef __ASSEMBLY__ 11 12#include <asm/reg.h> 13 14static __always_inline void __kuap_save_and_lock(struct pt_regs *regs) 15{ 16 regs->kuap = mfspr(SPRN_MD_AP); 17 mtspr(SPRN_MD_AP, MD_APG_KUAP); 18} 19#define __kuap_save_and_lock __kuap_save_and_lock 20 21static __always_inline void kuap_user_restore(struct pt_regs *regs) 22{ 23} 24 25static __always_inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap) 26{ 27 mtspr(SPRN_MD_AP, regs->kuap); 28} 29 30#ifdef CONFIG_PPC_KUAP_DEBUG 31static __always_inline unsigned long __kuap_get_and_assert_locked(void) 32{ 33 WARN_ON_ONCE(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16); 34 35 return 0; 36} 37#define __kuap_get_and_assert_locked __kuap_get_and_assert_locked 38#endif 39 40static __always_inline void uaccess_begin_8xx(unsigned long val) 41{ 42 asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : : 43 "i"(SPRN_MD_AP), "r"(val), "i"(MMU_FTR_KUAP) : "memory"); 44} 45 46static __always_inline void uaccess_end_8xx(void) 47{ 48 asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : : 49 "i"(SPRN_MD_AP), "r"(MD_APG_KUAP), "i"(MMU_FTR_KUAP) : "memory"); 50} 51 52static __always_inline void allow_user_access(void __user *to, const void __user *from, 53 unsigned long size, unsigned long dir) 54{ 55 uaccess_begin_8xx(MD_APG_INIT); 56} 57 58static __always_inline void prevent_user_access(unsigned long dir) 59{ 60 uaccess_end_8xx(); 61} 62 63static __always_inline unsigned long prevent_user_access_return(void) 64{ 65 unsigned long flags; 66 67 flags = mfspr(SPRN_MD_AP); 68 69 uaccess_end_8xx(); 70 71 return flags; 72} 73 74static __always_inline void restore_user_access(unsigned long flags) 75{ 76 uaccess_begin_8xx(flags); 77} 78 79static __always_inline bool 80__bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) 81{ 82 return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000); 83} 84 85#endif /* !__ASSEMBLY__ */ 86 87#endif /* CONFIG_PPC_KUAP */ 88 89#endif /* _ASM_POWERPC_KUP_8XX_H_ */ 90