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