cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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smp.h (2319B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2012 Regents of the University of California
      4 */
      5
      6#ifndef _ASM_RISCV_SMP_H
      7#define _ASM_RISCV_SMP_H
      8
      9#include <linux/cpumask.h>
     10#include <linux/irqreturn.h>
     11#include <linux/thread_info.h>
     12
     13#define INVALID_HARTID ULONG_MAX
     14
     15struct seq_file;
     16extern unsigned long boot_cpu_hartid;
     17
     18struct riscv_ipi_ops {
     19	void (*ipi_inject)(const struct cpumask *target);
     20	void (*ipi_clear)(void);
     21};
     22
     23#ifdef CONFIG_SMP
     24/*
     25 * Mapping between linux logical cpu index and hartid.
     26 */
     27extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
     28#define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
     29
     30/* print IPI stats */
     31void show_ipi_stats(struct seq_file *p, int prec);
     32
     33/* SMP initialization hook for setup_arch */
     34void __init setup_smp(void);
     35
     36/* Called from C code, this handles an IPI. */
     37void handle_IPI(struct pt_regs *regs);
     38
     39/* Hook for the generic smp_call_function_many() routine. */
     40void arch_send_call_function_ipi_mask(struct cpumask *mask);
     41
     42/* Hook for the generic smp_call_function_single() routine. */
     43void arch_send_call_function_single_ipi(int cpu);
     44
     45int riscv_hartid_to_cpuid(int hartid);
     46
     47/* Set custom IPI operations */
     48void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
     49
     50/* Clear IPI for current CPU */
     51void riscv_clear_ipi(void);
     52
     53/* Secondary hart entry */
     54asmlinkage void smp_callin(void);
     55
     56/*
     57 * Obtains the hart ID of the currently executing task.  This relies on
     58 * THREAD_INFO_IN_TASK, but we define that unconditionally.
     59 */
     60#define raw_smp_processor_id() (current_thread_info()->cpu)
     61
     62#if defined CONFIG_HOTPLUG_CPU
     63int __cpu_disable(void);
     64void __cpu_die(unsigned int cpu);
     65#endif /* CONFIG_HOTPLUG_CPU */
     66
     67#else
     68
     69static inline void show_ipi_stats(struct seq_file *p, int prec)
     70{
     71}
     72
     73static inline int riscv_hartid_to_cpuid(int hartid)
     74{
     75	if (hartid == boot_cpu_hartid)
     76		return 0;
     77
     78	return -1;
     79}
     80static inline unsigned long cpuid_to_hartid_map(int cpu)
     81{
     82	return boot_cpu_hartid;
     83}
     84
     85static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
     86{
     87}
     88
     89static inline void riscv_clear_ipi(void)
     90{
     91}
     92
     93#endif /* CONFIG_SMP */
     94
     95#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
     96bool cpu_has_hotplug(unsigned int cpu);
     97#else
     98static inline bool cpu_has_hotplug(unsigned int cpu)
     99{
    100	return false;
    101}
    102#endif
    103
    104#endif /* _ASM_RISCV_SMP_H */