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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getcpu.S (933B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 *
      4 * Copyright (C) IBM Corporation, 2012
      5 *
      6 * Author: Anton Blanchard <anton@au.ibm.com>
      7 */
      8#include <asm/ppc_asm.h>
      9#include <asm/vdso.h>
     10
     11	.text
     12/*
     13 * Exact prototype of getcpu
     14 *
     15 * int __kernel_getcpu(unsigned *cpu, unsigned *node);
     16 *
     17 */
     18#if defined(CONFIG_PPC64)
     19V_FUNCTION_BEGIN(__kernel_getcpu)
     20  .cfi_startproc
     21	mfspr	r5,SPRN_SPRG_VDSO_READ
     22	PPC_LCMPI	cr0,r3,0
     23	PPC_LCMPI	cr1,r4,0
     24	clrlwi  r6,r5,16
     25	rlwinm  r7,r5,16,31-15,31-0
     26	beq	cr0,1f
     27	stw	r6,0(r3)
     281:	crclr	cr0*4+so
     29	li	r3,0			/* always success */
     30	beqlr	cr1
     31	stw	r7,0(r4)
     32	blr
     33  .cfi_endproc
     34V_FUNCTION_END(__kernel_getcpu)
     35#elif !defined(CONFIG_SMP)
     36V_FUNCTION_BEGIN(__kernel_getcpu)
     37  .cfi_startproc
     38	cmpwi	cr0, r3, 0
     39	cmpwi	cr1, r4, 0
     40	li	r5, 0
     41	beq	cr0, 1f
     42	stw	r5, 0(r3)
     431:	li	r3, 0			/* always success */
     44	crclr	cr0*4+so
     45	beqlr	cr1
     46	stw	r5, 0(r4)
     47	blr
     48  .cfi_endproc
     49V_FUNCTION_END(__kernel_getcpu)
     50#endif