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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pvr.c (1939B)

      1/*
      2 * Support for MicroBlaze PVR (processor version register)
      3 *
      4 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
      5 * Copyright (C) 2007-2009 PetaLogix
      6 * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
      7 *
      8 * This file is subject to the terms and conditions of the GNU General Public
      9 * License. See the file "COPYING" in the main directory of this archive
     10 * for more details.
     11 */
     12
     13#include <linux/kernel.h>
     14#include <linux/compiler.h>
     15#include <asm/exceptions.h>
     16#include <asm/pvr.h>
     17#include <linux/irqflags.h>
     18
     19/*
     20 * Until we get an assembler that knows about the pvr registers,
     21 * this horrible cruft will have to do.
     22 * That hardcoded opcode is mfs r3, rpvrNN
     23 */
     24
     25#define get_single_pvr(pvrid, val)				\
     26{								\
     27	register unsigned tmp __asm__("r3");			\
     28	tmp = 0x0;	/* Prevent warning about unused */	\
     29	__asm__ __volatile__ (					\
     30			"mfs	%0, rpvr" #pvrid ";"		\
     31			: "=r" (tmp) : : "memory");		\
     32	val = tmp;						\
     33}
     34
     35/*
     36 * Does the CPU support the PVR register?
     37 * return value:
     38 * 0: no PVR
     39 * 1: simple PVR
     40 * 2: full PVR
     41 *
     42 * This must work on all CPU versions, including those before the
     43 * PVR was even an option.
     44 */
     45
     46int cpu_has_pvr(void)
     47{
     48	unsigned long flags;
     49	unsigned pvr0;
     50
     51	local_save_flags(flags);
     52
     53	/* PVR bit in MSR tells us if there is any support */
     54	if (!(flags & PVR_MSR_BIT))
     55		return 0;
     56
     57	get_single_pvr(0, pvr0);
     58	pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0);
     59
     60	if (pvr0 & PVR0_PVR_FULL_MASK)
     61		return 1;
     62
     63	/* for partial PVR use static cpuinfo */
     64	return 2;
     65}
     66
     67void get_pvr(struct pvr_s *p)
     68{
     69	get_single_pvr(0, p->pvr[0]);
     70	get_single_pvr(1, p->pvr[1]);
     71	get_single_pvr(2, p->pvr[2]);
     72	get_single_pvr(3, p->pvr[3]);
     73	get_single_pvr(4, p->pvr[4]);
     74	get_single_pvr(5, p->pvr[5]);
     75	get_single_pvr(6, p->pvr[6]);
     76	get_single_pvr(7, p->pvr[7]);
     77	get_single_pvr(8, p->pvr[8]);
     78	get_single_pvr(9, p->pvr[9]);
     79	get_single_pvr(10, p->pvr[10]);
     80	get_single_pvr(11, p->pvr[11]);
     81}