Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 116 insertions, 0 deletions

diff --git a/arch/alpha/oprofile/op_model_ev4.c b/arch/alpha/oprofile/op_model_ev4.c
new file mode 100644
index 000000000000..80d764dbf22f
--- /dev/null
+++ b/arch/alpha/oprofile/op_model_ev4.c
@@ -0,0 +1,116 @@
+/**
+ * @file arch/alpha/oprofile/op_model_ev4.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author Richard Henderson <rth@twiddle.net>
+ */
+
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+
+#include "op_impl.h"
+
+
+/* Compute all of the registers in preparation for enabling profiling.  */
+
+static void
+ev4_reg_setup(struct op_register_config *reg,
+              struct op_counter_config *ctr,
+              struct op_system_config *sys)
+{
+        unsigned long ctl = 0, count, hilo;
+
+        /* Select desired events.  We've mapped the event numbers
+           such that they fit directly into the event selection fields.
+
+           Note that there is no "off" setting.  In both cases we select
+           the EXTERNAL event source, hoping that it'll be the lowest
+           frequency, and set the frequency counter to LOW.  The interrupts
+           for these "disabled" counter overflows are ignored by the
+           interrupt handler.
+
+           This is most irritating, because the hardware *can* enable and
+           disable the interrupts for these counters independently, but the
+           wrperfmon interface doesn't allow it.  */
+
+        ctl |= (ctr[0].enabled ? ctr[0].event << 8 : 14 << 8);
+        ctl |= (ctr[1].enabled ? (ctr[1].event - 16) << 32 : 7ul << 32);
+
+        /* EV4 can not read or write its counter registers.  The only
+           thing one can do at all is see if you overflow and get an
+           interrupt.  We can set the width of the counters, to some
+           extent.  Take the interrupt count selected by the user,
+           map it onto one of the possible values, and write it back.  */
+
+        count = ctr[0].count;
+        if (count <= 4096)
+                count = 4096, hilo = 1;
+        else
+                count = 65536, hilo = 0;
+        ctr[0].count = count;
+        ctl |= (ctr[0].enabled && hilo) << 3;
+
+        count = ctr[1].count;
+        if (count <= 256)
+                count = 256, hilo = 1;
+        else
+                count = 4096, hilo = 0;
+        ctr[1].count = count;
+        ctl |= (ctr[1].enabled && hilo);
+
+        reg->mux_select = ctl;
+
+        /* Select performance monitoring options.  */
+        /* ??? Need to come up with some mechanism to trace only
+           selected processes.  EV4 does not have a mechanism to
+           select kernel or user mode only.  For now, enable always.  */
+        reg->proc_mode = 0;
+
+        /* Frequency is folded into mux_select for EV4.  */
+        reg->freq = 0;
+
+        /* See above regarding no writes.  */
+        reg->reset_values = 0;
+        reg->need_reset = 0;
+
+}
+
+/* Program all of the registers in preparation for enabling profiling.  */
+
+static void
+ev4_cpu_setup(void *x)
+{
+        struct op_register_config *reg = x;
+
+        wrperfmon(2, reg->mux_select);
+        wrperfmon(3, reg->proc_mode);
+}
+
+static void
+ev4_handle_interrupt(unsigned long which, struct pt_regs *regs,
+                     struct op_counter_config *ctr)
+{
+        /* EV4 can't properly disable counters individually.
+           Discard "disabled" events now.  */
+        if (!ctr[which].enabled)
+                return;
+
+        /* Record the sample.  */
+        oprofile_add_sample(regs, which);
+}
+
+
+struct op_axp_model op_model_ev4 = {
+        .reg_setup              = ev4_reg_setup,
+        .cpu_setup              = ev4_cpu_setup,
+        .reset_ctr              = NULL,
+        .handle_interrupt       = ev4_handle_interrupt,
+        .cpu_type               = "alpha/ev4",
+        .num_counters           = 2,
+        .can_set_proc_mode      = 0,
+};