1 files changed, 81 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/cpu/pvr.c b/arch/microblaze/kernel/cpu/pvr.c
new file mode 100644
index 000000000000..c9a4340ddd53
--- /dev/null
+++ b/arch/microblaze/kernel/cpu/pvr.c
@@ -0,0 +1,81 @@
+/*
+ * 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]);
+}