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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epapr_hcalls.S (1152B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
      4 */
      5
      6#include <linux/threads.h>
      7#include <asm/epapr_hcalls.h>
      8#include <asm/reg.h>
      9#include <asm/page.h>
     10#include <asm/cputable.h>
     11#include <asm/thread_info.h>
     12#include <asm/ppc_asm.h>
     13#include <asm/asm-compat.h>
     14#include <asm/asm-offsets.h>
     15#include <asm/export.h>
     16
     17#ifndef CONFIG_PPC64
     18/* epapr_ev_idle() was derived from e500_idle() */
     19_GLOBAL(epapr_ev_idle)
     20	PPC_LL	r4, TI_LOCAL_FLAGS(r2)	/* set napping bit */
     21	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
     22	PPC_STL	r4, TI_LOCAL_FLAGS(r2)	/* it will return to our caller */
     23
     24	wrteei	1
     25
     26idle_loop:
     27	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
     28
     29.global epapr_ev_idle_start
     30epapr_ev_idle_start:
     31	li	r3, -1
     32	nop
     33	nop
     34	nop
     35
     36	/*
     37	 * Guard against spurious wakeups from a hypervisor --
     38	 * only interrupt will cause us to return to LR due to
     39	 * _TLF_NAPPING.
     40	 */
     41	b	idle_loop
     42#endif
     43
     44/* Hypercall entry point. Will be patched with device tree instructions. */
     45.global epapr_hypercall_start
     46epapr_hypercall_start:
     47	li	r3, -1
     48	nop
     49	nop
     50	nop
     51	blr
     52EXPORT_SYMBOL(epapr_hypercall_start)