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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bL_switcher.h (2186B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * arch/arm/include/asm/bL_switcher.h
      4 *
      5 * Created by:  Nicolas Pitre, April 2012
      6 * Copyright:   (C) 2012-2013  Linaro Limited
      7 */
      8
      9#ifndef ASM_BL_SWITCHER_H
     10#define ASM_BL_SWITCHER_H
     11
     12#include <linux/compiler.h>
     13#include <linux/types.h>
     14
     15typedef void (*bL_switch_completion_handler)(void *cookie);
     16
     17int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
     18			 bL_switch_completion_handler completer,
     19			 void *completer_cookie);
     20static inline int bL_switch_request(unsigned int cpu, unsigned int new_cluster_id)
     21{
     22	return bL_switch_request_cb(cpu, new_cluster_id, NULL, NULL);
     23}
     24
     25/*
     26 * Register here to be notified about runtime enabling/disabling of
     27 * the switcher.
     28 *
     29 * The notifier chain is called with the switcher activation lock held:
     30 * the switcher will not be enabled or disabled during callbacks.
     31 * Callbacks must not call bL_switcher_{get,put}_enabled().
     32 */
     33#define BL_NOTIFY_PRE_ENABLE	0
     34#define BL_NOTIFY_POST_ENABLE	1
     35#define BL_NOTIFY_PRE_DISABLE	2
     36#define BL_NOTIFY_POST_DISABLE	3
     37
     38#ifdef CONFIG_BL_SWITCHER
     39
     40int bL_switcher_register_notifier(struct notifier_block *nb);
     41int bL_switcher_unregister_notifier(struct notifier_block *nb);
     42
     43/*
     44 * Use these functions to temporarily prevent enabling/disabling of
     45 * the switcher.
     46 * bL_switcher_get_enabled() returns true if the switcher is currently
     47 * enabled.  Each call to bL_switcher_get_enabled() must be followed
     48 * by a call to bL_switcher_put_enabled().  These functions are not
     49 * recursive.
     50 */
     51bool bL_switcher_get_enabled(void);
     52void bL_switcher_put_enabled(void);
     53
     54int bL_switcher_trace_trigger(void);
     55int bL_switcher_get_logical_index(u32 mpidr);
     56
     57#else
     58static inline int bL_switcher_register_notifier(struct notifier_block *nb)
     59{
     60	return 0;
     61}
     62
     63static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
     64{
     65	return 0;
     66}
     67
     68static inline bool bL_switcher_get_enabled(void) { return false; }
     69static inline void bL_switcher_put_enabled(void) { }
     70static inline int bL_switcher_trace_trigger(void) { return 0; }
     71static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
     72#endif /* CONFIG_BL_SWITCHER */
     73
     74#endif