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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efc_sm.c (1124B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
      4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
      5 */
      6
      7/*
      8 * Generic state machine framework.
      9 */
     10#include "efc.h"
     11#include "efc_sm.h"
     12
     13/**
     14 * efc_sm_post_event() - Post an event to a context.
     15 *
     16 * @ctx: State machine context
     17 * @evt: Event to post
     18 * @data: Event-specific data (if any)
     19 */
     20int
     21efc_sm_post_event(struct efc_sm_ctx *ctx,
     22		  enum efc_sm_event evt, void *data)
     23{
     24	if (!ctx->current_state)
     25		return -EIO;
     26
     27	ctx->current_state(ctx, evt, data);
     28	return 0;
     29}
     30
     31void
     32efc_sm_transition(struct efc_sm_ctx *ctx,
     33		  void (*state)(struct efc_sm_ctx *,
     34				enum efc_sm_event, void *), void *data)
     35
     36{
     37	if (ctx->current_state == state) {
     38		efc_sm_post_event(ctx, EFC_EVT_REENTER, data);
     39	} else {
     40		efc_sm_post_event(ctx, EFC_EVT_EXIT, data);
     41		ctx->current_state = state;
     42		efc_sm_post_event(ctx, EFC_EVT_ENTER, data);
     43	}
     44}
     45
     46static char *event_name[] = EFC_SM_EVENT_NAME;
     47
     48const char *efc_sm_event_name(enum efc_sm_event evt)
     49{
     50	if (evt > EFC_EVT_LAST)
     51		return "unknown";
     52
     53	return event_name[evt];
     54}