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/*
* 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/system.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__ ( \
".byte 0x94,0x60,0xa0, " #pvrid "\n\t" \
: "=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 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(0x00, 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]);
}
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