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-rw-r--r--kernel/arch/alpha/oprofile/op_model_ev6.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/kernel/arch/alpha/oprofile/op_model_ev6.c b/kernel/arch/alpha/oprofile/op_model_ev6.c
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+++ b/kernel/arch/alpha/oprofile/op_model_ev6.c
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+/**
+ * @file arch/alpha/oprofile/op_model_ev6.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author Richard Henderson <rth@twiddle.net>
+ */
+
+#include <linux/oprofile.h>
+#include <linux/smp.h>
+#include <asm/ptrace.h>
+
+#include "op_impl.h"
+
+
+/* Compute all of the registers in preparation for enabling profiling. */
+
+static void
+ev6_reg_setup(struct op_register_config *reg,
+ struct op_counter_config *ctr,
+ struct op_system_config *sys)
+{
+ unsigned long ctl, reset, need_reset, i;
+
+ /* Select desired events. We've mapped the event numbers
+ such that they fit directly into the event selection fields. */
+ ctl = 0;
+ if (ctr[0].enabled && ctr[0].event)
+ ctl |= (ctr[0].event & 1) << 4;
+ if (ctr[1].enabled)
+ ctl |= (ctr[1].event - 2) & 15;
+ reg->mux_select = ctl;
+
+ /* Select logging options. */
+ /* ??? Need to come up with some mechanism to trace only
+ selected processes. EV6 does not have a mechanism to
+ select kernel or user mode only. For now, enable always. */
+ reg->proc_mode = 0;
+
+ /* EV6 cannot change the width of the counters as with the
+ other implementations. But fortunately, we can write to
+ the counters and set the value such that it will overflow
+ at the right time. */
+ reset = need_reset = 0;
+ for (i = 0; i < 2; ++i) {
+ unsigned long count = ctr[i].count;
+ if (!ctr[i].enabled)
+ continue;
+
+ if (count > 0x100000)
+ count = 0x100000;
+ ctr[i].count = count;
+ reset |= (0x100000 - count) << (i ? 6 : 28);
+ if (count != 0x100000)
+ need_reset |= 1 << i;
+ }
+ reg->reset_values = reset;
+ reg->need_reset = need_reset;
+}
+
+/* Program all of the registers in preparation for enabling profiling. */
+
+static void
+ev6_cpu_setup (void *x)
+{
+ struct op_register_config *reg = x;
+
+ wrperfmon(2, reg->mux_select);
+ wrperfmon(3, reg->proc_mode);
+ wrperfmon(6, reg->reset_values | 3);
+}
+
+/* CTR is a counter for which the user has requested an interrupt count
+ in between one of the widths selectable in hardware. Reset the count
+ for CTR to the value stored in REG->RESET_VALUES. */
+
+static void
+ev6_reset_ctr(struct op_register_config *reg, unsigned long ctr)
+{
+ wrperfmon(6, reg->reset_values | (1 << ctr));
+}
+
+static void
+ev6_handle_interrupt(unsigned long which, struct pt_regs *regs,
+ struct op_counter_config *ctr)
+{
+ /* Record the sample. */
+ oprofile_add_sample(regs, which);
+}
+
+
+struct op_axp_model op_model_ev6 = {
+ .reg_setup = ev6_reg_setup,
+ .cpu_setup = ev6_cpu_setup,
+ .reset_ctr = ev6_reset_ctr,
+ .handle_interrupt = ev6_handle_interrupt,
+ .cpu_type = "alpha/ev6",
+ .num_counters = 2,
+ .can_set_proc_mode = 0,
+};