[PATCH] Add VIA HW RNG driver

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/char/hw_random/via-rng.c b/drivers/char/hw_random/via-rng.c
new file mode 100644
index 000000000000..0e786b617bb8
--- /dev/null
+++ b/drivers/char/hw_random/via-rng.c
@@ -0,0 +1,183 @@
+/*
+ * RNG driver for VIA RNGs
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * with the majority of the code coming from:
+ *
+ * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
+ * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for the AMD 768 Random Number Generator (RNG)
+ * (c) Copyright 2001 Red Hat Inc <alan@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for Intel i810 Random Number Generator (RNG)
+ * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/hw_random.h>
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/cpufeature.h>
+
+
+#define PFX     KBUILD_MODNAME ": "
+
+
+enum {
+        VIA_STRFILT_CNT_SHIFT   = 16,
+        VIA_STRFILT_FAIL        = (1 << 15),
+        VIA_STRFILT_ENABLE      = (1 << 14),
+        VIA_RAWBITS_ENABLE      = (1 << 13),
+        VIA_RNG_ENABLE          = (1 << 6),
+        VIA_XSTORE_CNT_MASK     = 0x0F,
+
+        VIA_RNG_CHUNK_8         = 0x00, /* 64 rand bits, 64 stored bits */
+        VIA_RNG_CHUNK_4         = 0x01, /* 32 rand bits, 32 stored bits */
+        VIA_RNG_CHUNK_4_MASK    = 0xFFFFFFFF,
+        VIA_RNG_CHUNK_2         = 0x02, /* 16 rand bits, 32 stored bits */
+        VIA_RNG_CHUNK_2_MASK    = 0xFFFF,
+        VIA_RNG_CHUNK_1         = 0x03, /* 8 rand bits, 32 stored bits */
+        VIA_RNG_CHUNK_1_MASK    = 0xFF,
+};
+
+/*
+ * Investigate using the 'rep' prefix to obtain 32 bits of random data
+ * in one insn.  The upside is potentially better performance.  The
+ * downside is that the instruction becomes no longer atomic.  Due to
+ * this, just like familiar issues with /dev/random itself, the worst
+ * case of a 'rep xstore' could potentially pause a cpu for an
+ * unreasonably long time.  In practice, this condition would likely
+ * only occur when the hardware is failing.  (or so we hope :))
+ *
+ * Another possible performance boost may come from simply buffering
+ * until we have 4 bytes, thus returning a u32 at a time,
+ * instead of the current u8-at-a-time.
+ */
+
+static inline u32 xstore(u32 *addr, u32 edx_in)
+{
+        u32 eax_out;
+
+        asm(".byte 0x0F,0xA7,0xC0 /* xstore %%edi (addr=%0) */"
+                :"=m"(*addr), "=a"(eax_out)
+                :"D"(addr), "d"(edx_in));
+
+        return eax_out;
+}
+
+static int via_rng_data_present(struct hwrng *rng)
+{
+        u32 bytes_out;
+        u32 *via_rng_datum = (u32 *)(&rng->priv);
+
+        /* We choose the recommended 1-byte-per-instruction RNG rate,
+         * for greater randomness at the expense of speed.  Larger
+         * values 2, 4, or 8 bytes-per-instruction yield greater
+         * speed at lesser randomness.
+         *
+         * If you change this to another VIA_CHUNK_n, you must also
+         * change the ->n_bytes values in rng_vendor_ops[] tables.
+         * VIA_CHUNK_8 requires further code changes.
+         *
+         * A copy of MSR_VIA_RNG is placed in eax_out when xstore
+         * completes.
+         */
+
+        *via_rng_datum = 0; /* paranoia, not really necessary */
+        bytes_out = xstore(via_rng_datum, VIA_RNG_CHUNK_1);
+        bytes_out &= VIA_XSTORE_CNT_MASK;
+        if (bytes_out == 0)
+                return 0;
+        return 1;
+}
+
+static int via_rng_data_read(struct hwrng *rng, u32 *data)
+{
+        u32 via_rng_datum = (u32)rng->priv;
+
+        *data = via_rng_datum;
+
+        return 1;
+}
+
+static int via_rng_init(struct hwrng *rng)
+{
+        u32 lo, hi, old_lo;
+
+        /* Control the RNG via MSR.  Tread lightly and pay very close
+         * close attention to values written, as the reserved fields
+         * are documented to be "undefined and unpredictable"; but it
+         * does not say to write them as zero, so I make a guess that
+         * we restore the values we find in the register.
+         */
+        rdmsr(MSR_VIA_RNG, lo, hi);
+
+        old_lo = lo;
+        lo &= ~(0x7f << VIA_STRFILT_CNT_SHIFT);
+        lo &= ~VIA_XSTORE_CNT_MASK;
+        lo &= ~(VIA_STRFILT_ENABLE | VIA_STRFILT_FAIL | VIA_RAWBITS_ENABLE);
+        lo |= VIA_RNG_ENABLE;
+
+        if (lo != old_lo)
+                wrmsr(MSR_VIA_RNG, lo, hi);
+
+        /* perhaps-unnecessary sanity check; remove after testing if
+           unneeded */
+        rdmsr(MSR_VIA_RNG, lo, hi);
+        if ((lo & VIA_RNG_ENABLE) == 0) {
+                printk(KERN_ERR PFX "cannot enable VIA C3 RNG, aborting\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+
+static struct hwrng via_rng = {
+        .name           = "via",
+        .init           = via_rng_init,
+        .data_present   = via_rng_data_present,
+        .data_read      = via_rng_data_read,
+};
+
+
+static int __init mod_init(void)
+{
+        int err;
+
+        if (!cpu_has_xstore)
+                return -ENODEV;
+        printk(KERN_INFO "VIA RNG detected\n");
+        err = hwrng_register(&via_rng);
+        if (err) {
+                printk(KERN_ERR PFX "RNG registering failed (%d)\n",
+                       err);
+                goto out;
+        }
+out:
+        return err;
+}
+
+static void __exit mod_exit(void)
+{
+        hwrng_unregister(&via_rng);
+}
+
+subsys_initcall(mod_init);
+module_exit(mod_exit);
+
+MODULE_DESCRIPTION("H/W RNG driver for VIA chipsets");
+MODULE_LICENSE("GPL");