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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idle.fuc (2527B)

      1/*
      2 * Copyright 2013 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Ben Skeggs
     23 */
     24
     25#ifdef INCLUDE_PROC
     26process(PROC_IDLE, #idle, #idle_recv)
     27#endif
     28
     29/******************************************************************************
     30 * IDLE data segment
     31 *****************************************************************************/
     32#ifdef INCLUDE_DATA
     33#endif
     34
     35/******************************************************************************
     36 * IDLE code segment
     37 *****************************************************************************/
     38#ifdef INCLUDE_CODE
     39// description
     40//
     41// $r15 - current (idle)
     42// $r14 - message
     43// $r0  - zero
     44idle_recv:
     45	ret
     46
     47// description
     48//
     49// $r15 - current (idle)
     50// $r0  - zero
     51idle:
     52	// set our "no interrupt has occurred during our execution" flag
     53	bset $flags $p0
     54
     55	// count IDLE invocations for debugging purposes
     56	nv_iord($r1, NV_PPWR_DSCRATCH(1))
     57	add b32 $r1 1
     58	nv_iowr(NV_PPWR_DSCRATCH(1), $r1)
     59
     60	// keep looping while there's pending messages for any process
     61	idle_loop:
     62	mov $r1 #proc_list_head
     63	bclr $flags $p2
     64	idle_proc:
     65		// process the process' messages until there's none left
     66		idle_proc_exec:
     67			push $r1
     68			mov b32 $r14 $r1
     69			call(recv)
     70			pop $r1
     71			bra not $p1 #idle_proc_next
     72			bset $flags $p2
     73			bra #idle_proc_exec
     74		// next process!
     75		idle_proc_next:
     76		add b32 $r1 #proc_size
     77		cmp b32 $r1 $r15
     78		bra ne #idle_proc
     79	bra $p2 #idle_loop
     80
     81	// sleep if no interrupts have occurred
     82	sleep $p0
     83	bra #idle
     84#endif