2 * Support for MicroBlaze PVR (processor version register)
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>
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
13 #include <linux/kernel.h>
14 #include <linux/compiler.h>
15 #include <asm/exceptions.h>
19 * Until we get an assembler that knows about the pvr registers,
20 * this horrible cruft will have to do.
21 * That hardcoded opcode is mfs r3, rpvrNN
24 #define get_single_pvr(pvrid, val) \
26 register unsigned tmp __asm__("r3"); \
27 tmp = 0x0; /* Prevent warning about unused */ \
28 __asm__ __volatile__ ( \
29 "mfs %0, rpvr" #pvrid ";" \
30 : "=r" (tmp) : : "memory"); \
35 * Does the CPU support the PVR register?
41 * This must work on all CPU versions, including those before the
42 * PVR was even an option.
50 local_save_flags(flags
);
52 /* PVR bit in MSR tells us if there is any support */
53 if (!(flags
& PVR_MSR_BIT
))
56 get_single_pvr(0, pvr0
);
57 pr_debug("%s: pvr0 is 0x%08x\n", __func__
, pvr0
);
59 if (pvr0
& PVR0_PVR_FULL_MASK
)
62 /* for partial PVR use static cpuinfo */
66 void get_pvr(struct pvr_s
*p
)
68 get_single_pvr(0, p
->pvr
[0]);
69 get_single_pvr(1, p
->pvr
[1]);
70 get_single_pvr(2, p
->pvr
[2]);
71 get_single_pvr(3, p
->pvr
[3]);
72 get_single_pvr(4, p
->pvr
[4]);
73 get_single_pvr(5, p
->pvr
[5]);
74 get_single_pvr(6, p
->pvr
[6]);
75 get_single_pvr(7, p
->pvr
[7]);
76 get_single_pvr(8, p
->pvr
[8]);
77 get_single_pvr(9, p
->pvr
[9]);
78 get_single_pvr(10, p
->pvr
[10]);
79 get_single_pvr(11, p
->pvr
[11]);