/* * 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> /* * 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]); }