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+#----------------------------------------------------------------------------
+# On command line:
+#
+# make all = Make software.
+#
+# make clean = Clean out built project files.
+#
+# make coff = Convert ELF to AVR COFF.
+#
+# make extcoff = Convert ELF to AVR Extended COFF.
+#
+# make program = Download the hex file to the device.
+# Please customize your programmer settings(PROGRAM_CMD)
+#
+# make teensy = Download the hex file to the device, using teensy_loader_cli.
+# (must have teensy_loader_cli installed).
+#
+# make dfu = Download the hex file to the device, using dfu-programmer (must
+# have dfu-programmer installed).
+#
+# make flip = Download the hex file to the device, using Atmel FLIP (must
+# have Atmel FLIP installed).
+#
+# make dfu-ee = Download the eeprom file to the device, using dfu-programmer
+# (must have dfu-programmer installed).
+#
+# make flip-ee = Download the eeprom file to the device, using Atmel FLIP
+# (must have Atmel FLIP installed).
+#
+# make debug = Start either simulavr or avarice as specified for debugging,
+# with avr-gdb or avr-insight as the front end for debugging.
+#
+# make filename.s = Just compile filename.c into the assembler code only.
+#
+# make filename.i = Create a preprocessed source file for use in submitting
+# bug reports to the GCC project.
+#
+# To rebuild project do "make clean" then "make all".
+#----------------------------------------------------------------------------
+
+# Target file name (without extension).
+TARGET = kc60
+
+
+# Directory common source filess exist
+TOP_DIR = ../..
+TMK_DIR = ../../tmk_core
+
+# Directory keyboard dependent files exist
+TARGET_DIR = .
+
+# # project specific files
+SRC = kc60.c
+
+ifdef KEYMAP
+ SRC := keymaps/$(KEYMAP).c $(SRC)
+else
+ SRC := keymaps/default.c $(SRC)
+endif
+
+CONFIG_H = config.h
+
+# MCU name
+#MCU = at90usb1287
+MCU = atmega32u4
+
+# Processor frequency.
+# This will define a symbol, F_CPU, in all source code files equal to the
+# processor frequency in Hz. You can then use this symbol in your source code to
+# calculate timings. Do NOT tack on a 'UL' at the end, this will be done
+# automatically to create a 32-bit value in your source code.
+#
+# This will be an integer division of F_USB below, as it is sourced by
+# F_USB after it has run through any CPU prescalers. Note that this value
+# does not *change* the processor frequency - it should merely be updated to
+# reflect the processor speed set externally so that the code can use accurate
+# software delays.
+F_CPU = 16000000
+
+
+#
+# LUFA specific
+#
+# Target architecture (see library "Board Types" documentation).
+ARCH = AVR8
+
+# Input clock frequency.
+# This will define a symbol, F_USB, in all source code files equal to the
+# input clock frequency (before any prescaling is performed) in Hz. This value may
+# differ from F_CPU if prescaling is used on the latter, and is required as the
+# raw input clock is fed directly to the PLL sections of the AVR for high speed
+# clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+# at the end, this will be done automatically to create a 32-bit value in your
+# source code.
+#
+# If no clock division is performed on the input clock inside the AVR (via the
+# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+F_USB = $(F_CPU)
+
+# Interrupt driven control endpoint task(+60)
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
+
+# Boot Section Size in *bytes*
+# Teensy halfKay 512
+# Teensy++ halfKay 1024
+# Atmel DFU loader 4096
+# LUFA bootloader 4096
+# USBaspLoader 2048
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
+
+
+# Build Options
+# change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = yes # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes # Audio control and System control(+450)
+CONSOLE_ENABLE = yes # Console for debug(+400)
+COMMAND_ENABLE = yes # Commands for debug and configuration
+KEYBOARD_LOCK_ENABLE = yes # Allow locking of keyboard via magic key
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no # USB Nkey Rollover
+BACKLIGHT_ENABLE = yes # Enable keyboard backlight functionality
+MIDI_ENABLE = no # MIDI controls
+UNICODE_ENABLE = no # Unicode
+BLUETOOTH_ENABLE = no # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no # Audio output on port C6
+
+
+ifdef KEYMAP
+
+ifeq ("$(wildcard keymaps/$(KEYMAP).c)","")
+ifneq ("$(wildcard keymaps/$(KEYMAP)/makefile.mk)","")
+ include keymaps/$(KEYMAP)/makefile.mk
+endif
+endif
+
+else
+
+ifneq ("$(wildcard keymaps/default/makefile.mk)","")
+ include keymaps/default/makefile.mk
+endif
+
+endif
+
+# Optimize size but this may cause error "relocation truncated to fit"
+#EXTRALDFLAGS = -Wl,--relax
+
+# Search Path
+VPATH += $(TARGET_DIR)
+VPATH += $(TOP_DIR)
+VPATH += $(TMK_DIR)
+
+include $(TOP_DIR)/quantum/quantum.mk
+
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/*
 * Read-Copy Update mechanism for mutual exclusion
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2001
 *
 * Authors: Dipankar Sarma <dipankar@in.ibm.com>
 *          Manfred Spraul <manfred@colorfullife.com>
 * 
 * Modifications for Xen: Jose Renato Santos
 * Copyright (C) Hewlett-Packard, 2006
 *
 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
 * Papers:
 * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
 * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 * http://lse.sourceforge.net/locking/rcupdate.html
 */
#include <xen/types.h>
#include <xen/kernel.h>
#include <xen/init.h>
#include <xen/spinlock.h>
#include <xen/smp.h>
#include <xen/rcupdate.h>
#include <xen/sched.h>
#include <asm/atomic.h>
#include <xen/bitops.h>
#include <xen/percpu.h>
#include <xen/softirq.h>

/* Definition for rcupdate control block. */
struct rcu_ctrlblk rcu_ctrlblk = {
    .cur = -300,
    .completed = -300,
    .lock = SPIN_LOCK_UNLOCKED,
    .cpumask = CPU_MASK_NONE,
};

DEFINE_PER_CPU(struct rcu_data, rcu_data) = { 0L };

static int blimit = 10;
static int qhimark = 10000;
static int qlowmark = 100;
static int rsinterval = 1000;

static void force_quiescent_state(struct rcu_data *rdp,
                                  struct rcu_ctrlblk *rcp)
{
    cpumask_t cpumask;
    raise_softirq(SCHEDULE_SOFTIRQ);
    if (unlikely(rdp->qlen - rdp->last_rs_qlen > rsinterval)) {
        rdp->last_rs_qlen = rdp->qlen;
        /*
         * Don't send IPI to itself. With irqs disabled,
         * rdp->cpu is the current cpu.
         */
        cpumask = rcp->cpumask;
        cpu_clear(rdp->cpu, cpumask);
        cpumask_raise_softirq(cpumask, SCHEDULE_SOFTIRQ);
    }
}

/**
 * call_rcu - Queue an RCU callback for invocation after a grace period.
 * @head: structure to be used for queueing the RCU updates.
 * @func: actual update function to be invoked after the grace period
 *
 * The update function will be invoked some time after a full grace
 * period elapses, in other words after all currently executing RCU
 * read-side critical sections have completed.  RCU read-side critical
 * sections are delimited by rcu_read_lock() and rcu_read_unlock(),
 * and may be nested.
 */
void fastcall call_rcu(struct rcu_head *head,
                       void (*func)(struct rcu_head *rcu))
{
    unsigned long flags;
    struct rcu_data *rdp;

    head->func = func;
    head->next = NULL;
    local_irq_save(flags);
    rdp = &__get_cpu_var(rcu_data);
    *rdp->nxttail = head;
    rdp->nxttail = &head->next;
    if (unlikely(++rdp->qlen > qhimark)) {
        rdp->blimit = INT_MAX;
        force_quiescent_state(rdp, &rcu_ctrlblk);
    }
    local_irq_restore(flags);
}

/*
 * Invoke the completed RCU callbacks. They are expected to be in
 * a per-cpu list.
 */
static void rcu_do_batch(struct rcu_data *rdp)
{
    struct rcu_head *next, *list;
    int count = 0;

    list = rdp->donelist;
    while (list) {
        next = rdp->donelist = list->next;
        list->func(list);
        list = next;
        rdp->qlen--;
        if (++count >= rdp->blimit)
            break;
    }
    if (rdp->blimit == INT_MAX && rdp->qlen <= qlowmark)
        rdp->blimit = blimit;
    if (!rdp->donelist)
        rdp->donetail = &rdp->donelist;
    else
        raise_softirq(RCU_SOFTIRQ);
}

/*
 * Grace period handling:
 * The grace period handling consists out of two steps:
 * - A new grace period is started.
 *   This is done by rcu_start_batch. The start is not broadcasted to
 *   all cpus, they must pick this up by comparing rcp->cur with
 *   rdp->quiescbatch. All cpus are recorded  in the
 *   rcu_ctrlblk.cpumask bitmap.
 * - All cpus must go through a quiescent state.
 *   Since the start of the grace period is not broadcasted, at least two
 *   calls to rcu_check_quiescent_state are required:
 *   The first call just notices that a new grace period is running. The
 *   following calls check if there was a quiescent state since the beginning
 *   of the grace period. If so, it updates rcu_ctrlblk.cpumask. If
 *   the bitmap is empty, then the grace period is completed.
 *   rcu_check_quiescent_state calls rcu_start_batch(0) to start the next grace
 *   period (if necessary).
 */
/*
 * Register a new batch of callbacks, and start it up if there is currently no
 * active batch and the batch to be registered has not already occurred.
 * Caller must hold rcu_ctrlblk.lock.
 */
static void rcu_start_batch(struct rcu_ctrlblk *rcp)
{
    if (rcp->next_pending &&
        rcp->completed == rcp->cur) {
        rcp->next_pending = 0;
        /*
         * next_pending == 0 must be visible in
         * __rcu_process_callbacks() before it can see new value of cur.
         */
        smp_wmb();
        rcp->cur++;

        rcp->cpumask = cpu_online_map;
    }
}

/*
 * cpu went through a quiescent state since the beginning of the grace period.
 * Clear it from the cpu mask and complete the grace period if it was the last
 * cpu. Start another grace period if someone has further entries pending
 */
static void cpu_quiet(int cpu, struct rcu_ctrlblk *rcp)
{
    cpu_clear(cpu, rcp->cpumask);
    if (cpus_empty(rcp->cpumask)) {
        /* batch completed ! */
        rcp->completed = rcp->cur;
        rcu_start_batch(rcp);
    }
}

/*
 * Check if the cpu has gone through a quiescent state (say context
 * switch). If so and if it already hasn't done so in this RCU
 * quiescent cycle, then indicate that it has done so.
 */
static void rcu_check_quiescent_state(struct rcu_ctrlblk *rcp,