cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

switch_to.h (3170B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
      4 */
      5#ifndef _ASM_POWERPC_SWITCH_TO_H
      6#define _ASM_POWERPC_SWITCH_TO_H
      7
      8#include <linux/sched.h>
      9#include <asm/reg.h>
     10
     11struct thread_struct;
     12struct task_struct;
     13struct pt_regs;
     14
     15extern struct task_struct *__switch_to(struct task_struct *,
     16	struct task_struct *);
     17#define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))
     18
     19extern struct task_struct *_switch(struct thread_struct *prev,
     20				   struct thread_struct *next);
     21
     22extern void switch_booke_debug_regs(struct debug_reg *new_debug);
     23
     24extern int emulate_altivec(struct pt_regs *);
     25
     26#ifdef CONFIG_PPC_BOOK3S_64
     27void restore_math(struct pt_regs *regs);
     28#else
     29static inline void restore_math(struct pt_regs *regs)
     30{
     31}
     32#endif
     33
     34void restore_tm_state(struct pt_regs *regs);
     35
     36extern void flush_all_to_thread(struct task_struct *);
     37extern void giveup_all(struct task_struct *);
     38
     39#ifdef CONFIG_PPC_FPU
     40extern void enable_kernel_fp(void);
     41extern void flush_fp_to_thread(struct task_struct *);
     42extern void giveup_fpu(struct task_struct *);
     43extern void save_fpu(struct task_struct *);
     44static inline void disable_kernel_fp(void)
     45{
     46	msr_check_and_clear(MSR_FP);
     47}
     48#else
     49static inline void save_fpu(struct task_struct *t) { }
     50static inline void flush_fp_to_thread(struct task_struct *t) { }
     51#endif
     52
     53#ifdef CONFIG_ALTIVEC
     54extern void enable_kernel_altivec(void);
     55extern void flush_altivec_to_thread(struct task_struct *);
     56extern void giveup_altivec(struct task_struct *);
     57extern void save_altivec(struct task_struct *);
     58static inline void disable_kernel_altivec(void)
     59{
     60	msr_check_and_clear(MSR_VEC);
     61}
     62#else
     63static inline void save_altivec(struct task_struct *t) { }
     64static inline void __giveup_altivec(struct task_struct *t) { }
     65static inline void enable_kernel_altivec(void)
     66{
     67	BUILD_BUG();
     68}
     69
     70static inline void disable_kernel_altivec(void)
     71{
     72	BUILD_BUG();
     73}
     74#endif
     75
     76#ifdef CONFIG_VSX
     77extern void enable_kernel_vsx(void);
     78extern void flush_vsx_to_thread(struct task_struct *);
     79static inline void disable_kernel_vsx(void)
     80{
     81	msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
     82}
     83#else
     84static inline void enable_kernel_vsx(void)
     85{
     86	BUILD_BUG();
     87}
     88
     89static inline void disable_kernel_vsx(void)
     90{
     91	BUILD_BUG();
     92}
     93#endif
     94
     95#ifdef CONFIG_SPE
     96extern void enable_kernel_spe(void);
     97extern void flush_spe_to_thread(struct task_struct *);
     98extern void giveup_spe(struct task_struct *);
     99extern void __giveup_spe(struct task_struct *);
    100static inline void disable_kernel_spe(void)
    101{
    102	msr_check_and_clear(MSR_SPE);
    103}
    104#else
    105static inline void __giveup_spe(struct task_struct *t) { }
    106#endif
    107
    108static inline void clear_task_ebb(struct task_struct *t)
    109{
    110#ifdef CONFIG_PPC_BOOK3S_64
    111    /* EBB perf events are not inherited, so clear all EBB state. */
    112    t->thread.ebbrr = 0;
    113    t->thread.ebbhr = 0;
    114    t->thread.bescr = 0;
    115    t->thread.mmcr2 = 0;
    116    t->thread.mmcr0 = 0;
    117    t->thread.siar = 0;
    118    t->thread.sdar = 0;
    119    t->thread.sier = 0;
    120    t->thread.used_ebb = 0;
    121#endif
    122}
    123
    124void kvmppc_save_user_regs(void);
    125void kvmppc_save_current_sprs(void);
    126
    127extern int set_thread_tidr(struct task_struct *t);
    128
    129#endif /* _ASM_POWERPC_SWITCH_TO_H */