/* * Support for MicroBlaze PVR (processor version register) * * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2007-2009 PetaLogix * Copyright (C) 2007 John Williams <john.williams@petalogix.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/kernel.h>#include <linux/compiler.h>#include <asm/exceptions.h>#include <asm/pvr.h>#include <linux/irqflags.h> /* * Until we get an assembler that knows about the pvr registers, * this horrible cruft will have to do. * That hardcoded opcode is mfs r3, rpvrNN */ #define get_single_pvr(pvrid, val)				\{								\	register unsigned tmp __asm__("r3");			\	tmp = 0x0;	/* Prevent warning about unused */	\	__asm__ __volatile__ (					\			"mfs	%0, rpvr" #pvrid ";"		\			: "=r" (tmp) : : "memory");		\	val = tmp;						\} /* * Does the CPU support the PVR register? * return value: * 0: no PVR * 1: simple PVR * 2: full PVR * * This must work on all CPU versions, including those before the * PVR was even an option. */ int cpu_has_pvr(void){	unsigned long flags;	unsigned pvr0; 	local_save_flags(flags); 	/* PVR bit in MSR tells us if there is any support */	if (!(flags & PVR_MSR_BIT))		return 0; 	get_single_pvr(0, pvr0);	pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0); 	if (pvr0 & PVR0_PVR_FULL_MASK)		return 1; 	/* for partial PVR use static cpuinfo */	return 2;} void get_pvr(struct pvr_s *p){	get_single_pvr(0, p->pvr[0]);	get_single_pvr(1, p->pvr[1]);	get_single_pvr(2, p->pvr[2]);	get_single_pvr(3, p->pvr[3]);	get_single_pvr(4, p->pvr[4]);	get_single_pvr(5, p->pvr[5]);	get_single_pvr(6, p->pvr[6]);	get_single_pvr(7, p->pvr[7]);	get_single_pvr(8, p->pvr[8]);	get_single_pvr(9, p->pvr[9]);	get_single_pvr(10, p->pvr[10]);	get_single_pvr(11, p->pvr[11]);}