PD#NONE: add cpuburn.[1/1]

Change-Id: Ic37c38e0b3751c7635c899af700ac42c6040302c

9 files changed, 898 insertions, 0 deletions

diff --git a/cpuburn/Android.mk b/cpuburn/Android.mk
new file mode 100644
index 0000000..e47b258
--- a/dev/null
+++ b/cpuburn/Android.mk
@@ -0,0 +1,25 @@
+# Copyright 2006 The Android Open Source Project
+
+# XXX using libutils for simulator build only...
+#
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+    cpuburn-a53.S    \
+
+LOCAL_STATIC_LIBRARIES:= \
+    libcutils \
+    libc
+
+
+LOCAL_C_INCLUDES := $(KERNEL_HEADERS)
+LOCAL_MODULE_TAGS := eng
+
+LOCAL_ARM_MODE := arm
+
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+
+LOCAL_LDLIBS += -lpthread
+LOCAL_MODULE:= cpuburn-a53
+include $(BUILD_EXECUTABLE)
diff --git a/cpuburn/README.md b/cpuburn/README.md
new file mode 100644
index 0000000..3fd963b
--- a/dev/null
+++ b/cpuburn/README.md
@@ -0,0 +1,4 @@
+cpuburn
+=======
+
+A collection of cpuburn programs tuned for different ARM hardware
diff --git a/cpuburn/cpuburn-a53.S b/cpuburn/cpuburn-a53.S
new file mode 100644
index 0000000..2b50295
--- a/dev/null
+++ b/cpuburn/cpuburn-a53.S
@@ -0,0 +1,183 @@
+/*
+ * Copyright © 2016 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This program tries to stress ARM Cortex-A53 processor to generate as
+ * much heat as possible.
+ * WARNING: improperly cooled or otherwise flawed hardware may potentially
+ * overheat and fail. Use at your own risk.
+ *
+ * Compilation instructions:
+ *     $ aarch64-linux-gnu-gcc -o cpuburn-a53 cpuburn-a53.S
+ * or
+ *     $ arm-linux-gnueabihf-gcc -o cpuburn-a53 cpuburn-a53.S
+ *
+ * See http://ssvb.github.io/2012/04/10/cpuburn-arm-cortex-a9.html
+ * for more details.
+ */
+
+#define LOOP_UNROLL_FACTOR   100
+
+#ifdef __aarch64__
+
+/****************************************************************************/
+/* 64-bit implementation                                                    */
+/****************************************************************************/
+
+    .cpu cortex-a53+fp+simd
+    .text
+    .align 2
+    .global main
+    .type main, %function
+
+main:
+        stp         x29, x30, [sp, #-16]!
+
+#ifdef __linux__
+        mov         w0, #84 /* _SC_NPROCESSORS_ONLN */
+        bl          sysconf
+        mov         w29, w0
+        cmp         w29, #2
+        blt         1f
+        bl          fork /* have at least 2 cores */
+        cmp         w29, #4
+        blt         1f
+        bl          fork /* have at least 4 cores */
+        cmp         w29, #8
+        blt         1f
+        bl          fork /* have at least 8 cores */
+1:
+#endif
+
+        movi        v28.16b, #0xff
+        movi        v29.16b, #0xff
+        movi        v30.16b, #0xff
+        movi        v31.16b, #0xff
+
+        adr         x4, 9f
+        add         x4, x4, #1
+        mov         x1, #0
+        mov         x2, #(64 / 4)
+
+        b           0f
+
+    .ltorg
+9:
+    .rept 64
+        .long 0xffffffff
+    .endr
+
+    .balign 64
+0:
+    .rept LOOP_UNROLL_FACTOR
+        uaba        v8.4s, v28.4s, v29.4s
+        bne         1f
+1:      uaba        v9.4s, v30.4s, v31.4s
+        ldr         w0, [x4, x1, lsl #2]
+        uaba        v10.4s, v28.4s, v29.4s
+        bne         1f
+1:      uaba        v11.4s, v30.4s, v31.4s
+        ldr         w0, [x4, x2, lsl #2]
+    .endr
+        b           0b
+
+        mov         w0, #0
+        ldp         x29, x30, [sp], #16
+        ret
+
+/****************************************************************************/
+
+#else
+
+/****************************************************************************/
+/* 32-bit implementation                                                    */
+/****************************************************************************/
+
+    .syntax unified
+    .text
+    .arch armv7-a
+    .fpu neon
+    .global main
+    .type main, %function
+    .align 2
+    .arm
+
+main:
+        push        {r4-r12, lr}
+        vpush       {q8-q15}
+
+#ifdef __linux__
+        mov         r0, 84 /* _SC_NPROCESSORS_ONLN */
+        bl          sysconf
+        mov         r4, r0
+        cmp         r4, #2
+        blt         1f
+        bl          fork /* have at least 2 cores */
+        cmp         r4, #4
+        blt         1f
+        bl          fork /* have at least 4 cores */
+        cmp         r4, #8
+        blt         1f
+        bl          fork /* have at least 8 cores */
+1:
+#endif
+
+        vmov.u8     q12, #0xff
+        vmov.u8     q13, #0xff
+        vmov.u8     q14, #0xff
+        vmov.u8     q15, #0xff
+
+        adr         lr, 9f
+        add         lr, lr, #1
+        mov         r1, #(64 / 4)
+        mov         r2, #(-64 / 4)
+
+        b           0f
+
+    .ltorg
+9:
+    .rept 64
+        .long 0xffffffff
+    .endr
+
+    .balign 64
+0:
+    .rept LOOP_UNROLL_FACTOR
+        vaba.u32    q8, q12, q13
+        bne         1f
+1:      vaba.u32    q9, q14, q15
+        ldrne       r0, [lr, r1, lsl #2]!
+        vaba.u32    q10, q12, q13
+        bne         1f
+1:      vaba.u32    q11, q14, q15
+        ldrne       r0, [lr, r2, lsl #2]!
+    .endr
+        b           0b
+
+        vpop        {q8-q15}
+        mov         r0, #0
+        pop         {r4-r12, pc}
+
+/****************************************************************************/
+
+#endif
diff --git a/cpuburn/cpuburn-a7.S b/cpuburn/cpuburn-a7.S
new file mode 100644
index 0000000..74e925a
--- a/dev/null
+++ b/cpuburn/cpuburn-a7.S
@@ -0,0 +1,91 @@
+/*
+ * Copyright © 2013 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This program tries to stress ARM Cortex-A7 processor to generate as
+ * much heat as possible.
+ * WARNING: improperly cooled or otherwise flawed hardware may potentially
+ * overheat and fail. Use at your own risk.
+ *
+ * Compilation instructions:
+ *     $ arm-linux-gnueabihf-gcc -o cpuburn-a7 cpuburn-a7.S
+ *
+ * See http://ssvb.github.io/2012/04/10/cpuburn-arm-cortex-a9.html
+ * for more details.
+ */
+
+    .syntax unified
+    .text
+    .arch armv7-a
+    .fpu neon
+    .arm
+
+    .global main
+
+.func main
+.type main, %function
+main:
+        push        {r4-r12, lr}
+
+#ifdef __linux__
+        mov         r0, 84 /* _SC_NPROCESSORS_ONLN */
+        bl          sysconf
+        mov         r4, r0
+        cmp         r4, #2
+        blt         1f
+        bl          fork /* have at least 2 cores */
+        cmp         r4, #4
+        blt         1f
+        bl          fork /* have at least 4 cores */
+        cmp         r4, #8
+        blt         1f
+        bl          fork /* have at least 8 cores */
+1:
+#endif
+
+        adr         lr, 9f
+        add         lr, lr, #129
+        mov         r1, #(64 / 4)
+        mov         r2, #(-64 / 4)
+        mov         ip, #1
+        b           0f
+
+    .balign 64
+9:
+    .rept 128
+        .long 0xffffffff
+    .endr
+
+    .balign 64
+/****************************************************************************/
+/* Main loop (2 cycles per loop iteration, reaching peak IPC=2)             */
+/****************************************************************************/
+0:      ldrne       r0, [lr, r1, lsl #2]
+        subs        ip, ip, #0
+
+        ldrne       r0, [lr, r2, lsl #2]
+        bne         0b
+
+        mov         r0, #0
+        pop         {r4-r12, pc}
+.endfunc
diff --git a/cpuburn/cpuburn-a8.S b/cpuburn/cpuburn-a8.S
new file mode 100644
index 0000000..c6f93a6
--- a/dev/null
+++ b/cpuburn/cpuburn-a8.S
@@ -0,0 +1,73 @@
+/*
+ * Copyright © 2012 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This program tries to stress ARM Cortex-A8 processor to generate as
+ * much heat as possible.
+ * WARNING: improperly cooled or otherwise flawed hardware may potentially
+ * overheat and fail. Use at your own risk.
+ *
+ * Compilation instructions:
+ *     $ arm-linux-gnueabihf-gcc -o cpuburn-a8 cpuburn-a8.S
+ *
+ * See http://ssvb.github.com/2012/04/10/cpuburn-arm-cortex-a9.html
+ * for more details.
+ */
+    .syntax unified
+    .text
+    .arch armv7-a
+    .fpu neon
+    .thumb
+
+    .global main
+
+/* optimal value for LOOP_UNROLL_FACTOR seems to be BTB size dependent */
+#define LOOP_UNROLL_FACTOR   130
+/* 16 seems to be a good choice */
+#define STEP                 16
+
+.func main
+.thumb_func
+main:
+        mov         lr, pc
+        adds        lr, lr, #63
+        bic         lr, lr, #63
+        mov         ip, #STEP
+    .p2align 2
+0:
+    .rept LOOP_UNROLL_FACTOR
+        vld2.8      {q0}, [lr, :128], ip
+        vaba.u8     q4, q4, q3
+        bne         1f
+1:      vld2.8      {q1}, [lr, :128], ip
+        vaba.u8     q5, q5, q0
+        vld2.8      {q2}, [lr, :128], ip
+        vaba.u8     q6, q6, q1
+        bne         1f
+1:      vld2.8      {q3}, [lr, :128], ip
+        vaba.u8     q7, q7, q2
+        smuad       r0, r1, r2
+        subs        lr, lr, #(STEP * 4)
+    .endr
+        bne         0b
+.endfunc
diff --git a/cpuburn/cpuburn-a9.S b/cpuburn/cpuburn-a9.S
new file mode 100644
index 0000000..0338b00
--- a/dev/null
+++ b/cpuburn/cpuburn-a9.S
@@ -0,0 +1,97 @@
+/*
+ * Copyright © 2012 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This program tries to stress ARM Cortex-A9 processor to generate as
+ * much heat as possible. Needs NEON, so does not work on Tegra 2.
+ * WARNING: improperly cooled or otherwise flawed hardware may potentially
+ * overheat and fail. Use at your own risk.
+ *
+ * Compilation instructions:
+ *     $ arm-linux-gnueabihf-gcc -o cpuburn-a9 cpuburn-a9.S
+ *
+ * See http://ssvb.github.com/2012/04/10/cpuburn-arm-cortex-a9.html
+ * for more details.
+ */
+    .syntax unified
+    .text
+    .arch armv7-a
+    .fpu neon
+    .arm
+
+    .global main
+    .global sysconf
+    .global fork
+
+/* optimal value for LOOP_UNROLL_FACTOR seems to be BTB size dependent */
+#define LOOP_UNROLL_FACTOR   110
+/* 64 seems to be a good choice */
+#define STEP                 64
+
+.func main
+.type main, %function
+main:
+
+#ifdef __linux__
+        mov         r0, 84 /* _SC_NPROCESSORS_ONLN */
+        blx         sysconf
+        mov         r4, r0
+        cmp         r4, #2
+        blt         1f
+        blx         fork /* have at least 2 cores */
+        cmp         r4, #4
+        blt         1f
+        blx         fork /* have at least 4 cores */
+1:
+#endif
+
+        ldr         lr, =(STEP * 4 + 15)
+        subs        lr, sp, lr
+        bic         lr, lr, #15
+        mov         ip, #STEP
+        mov         r0, #0
+        mov         r1, #0
+        mov         r2, #0
+        mov         r3, #0
+        ldr         r4, =0xFFFFFFFF
+        b           0f
+    .ltorg
+0:
+    .rept LOOP_UNROLL_FACTOR
+        vld2.8      {q0}, [lr, :128], ip
+        it          ne
+        smlalne     r0, r1, lr, r4
+        bne         1f
+1:
+        vld2.8      {q1}, [lr, :128], ip
+        it          ne
+        smlalne     r2, r3, lr, r4
+        bne         1f
+1:
+        vld2.8      {q2}, [lr, :128], ip
+        vld2.8      {q3}, [lr, :128], ip
+        it          ne
+        subsne      lr, lr, #(STEP * 4)
+    .endr
+        bne         0b
+.endfunc
diff --git a/cpuburn/cpuburn-krait.S b/cpuburn/cpuburn-krait.S
new file mode 100644
index 0000000..02f8c73
--- a/dev/null
+++ b/cpuburn/cpuburn-krait.S
@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2016 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This program tries to stress Qualcomm Krait 300/400 processor to generate
+ * as much heat as possible.
+ * WARNING: improperly cooled or otherwise flawed hardware may potentially
+ * overheat and fail. Use at your own risk.
+ *
+ * Compilation instructions:
+ *     $ arm-linux-gnueabihf-gcc -o cpuburn-krait cpuburn-krait.S
+ *
+ * See http://ssvb.github.io/2012/04/10/cpuburn-arm-cortex-a9.html
+ * for more details.
+ */
+
+    .syntax unified
+    .text
+    .arch armv7-a
+    .fpu neon
+    .global main
+    .type main, %function
+    .align 2
+    .arm
+
+main:
+        push        {r4-r12, lr}
+
+#ifdef __linux__
+        mov         r0, #84 /* _SC_NPROCESSORS_ONLN */
+        bl          sysconf
+        mov         r4, r0
+        cmp         r4, #2
+        blt         1f
+        bl          fork /* have at least 2 cores */
+        cmp         r4, #4
+        blt         1f
+        bl          fork /* have at least 4 cores */
+        cmp         r4, #8
+        blt         1f
+        bl          fork /* have at least 8 cores */
+1:
+#endif
+        vmov.u8     q8,  #0x0
+        vmov.u8     q9,  #0x0
+        vmov.u8     q14, #0xff
+        vmov.u8     q15, #0xff
+
+        adr         lr, 9f
+        mov         r1, #16
+        mov         r2, #-16
+        mov         ip, #1
+        b           0f
+
+    .balign 64
+9:
+    .rept 64
+        .long 0xffffffff
+    .endr
+
+    .balign 64
+/****************************************************************************/
+/* Main loop (2 cycles per loop iteration, reaching peak IPC=3)             */
+/****************************************************************************/
+0:      vld2.8      {q1}, [lr, :128], r1
+        vaba.u8     q8, q2, q14
+
+        vld2.8      {q2}, [lr, :128], r2
+        vaba.u8     q9, q1, q15
+
+        subs        ip, ip, #0
+        bne         0b
+/****************************************************************************/
+
+        mov         r0, #0
+        pop         {r4-r12, pc}
diff --git a/cpuburn/cpufreq-ljt-stress-test b/cpuburn/cpufreq-ljt-stress-test
new file mode 100644
index 0000000..dc3f93e
--- a/dev/null
+++ b/cpuburn/cpufreq-ljt-stress-test
@@ -0,0 +1,217 @@
+#!/usr/bin/env ruby
+#
+# Copyright © 2014 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+raise "Please upgrade ruby to at least version 1.9" if RUBY_VERSION =~ /^1\.8/
+
+require 'shellwords'
+
+# Test the availability of the required tools
+
+def tool_exists(tool_name)
+    `which #{tool_name} > /dev/null 2>&1`
+    if $?.to_i != 0 then
+        printf("Error: the required '%s' executable is not found in PATH\n", tool_name)
+        return false
+    else
+        return true
+    end
+end
+
+exit(1) if not tool_exists("md5sum") or
+           not tool_exists("nproc") or
+           not tool_exists("taskset")
+
+$cjpeg = "cjpeg"
+$djpeg = "djpeg"
+
+def download_and_compile_libjpeg_turbo()
+    exit(1) if not tool_exists("wget") or
+               not tool_exists("tar") or
+               not tool_exists("gcc")
+
+    shellescaped_dirname = Shellwords.escape(File.dirname(__FILE__))
+    ljtname = File.join(File.dirname(__FILE__), "libjpeg-turbo-1.3.1")
+    shellescaped_ljtname = Shellwords.escape(ljtname)
+
+    if File.exists?(File.join(ljtname, "djpeg")) then
+        $cjpeg = Shellwords.escape(File.join(ljtname, "cjpeg"))
+        $djpeg = Shellwords.escape(File.join(ljtname, "djpeg"))
+        return
+    end
+
+    if not `md5sum #{shellescaped_ljtname}.tar.gz 2>&1` =~ /2c3a68129dac443a72815ff5bb374b05/ then
+        url = "http://downloads.sourceforge.net/project/libjpeg-turbo/1.3.1/libjpeg-turbo-1.3.1.tar.gz"
+        printf("Downloading libjpeg-turbo-1.3.1.tar.gz ...")
+        `wget -c #{url} -O #{shellescaped_ljtname}.tar.gz 2>&1`
+        if $?.to_i != 0 then
+            printf(" failed\n")
+            exit(1)
+        end
+        printf(" done\n")
+    end
+    if not `md5sum #{shellescaped_ljtname}.tar.gz 2>&1` =~ /2c3a68129dac443a72815ff5bb374b05/ then
+        printf("MD5 check failed for the downloaded libjpeg-turbo-1.3.1.tar.gz\n")
+        exit(1)
+    end
+
+    printf("Extracting libjpeg-turbo-1.3.1.tar.gz ...")
+    `tar -xzf #{shellescaped_ljtname}.tar.gz -C #{shellescaped_dirname}`
+    if $?.to_i != 0 then
+        printf(" failed\n")
+        exit(1)
+    end
+    printf(" done\n")
+
+    Dir.chdir(ljtname) {
+        printf("Compiling libjpeg-turbo, please be patient ...")
+        compilation_log = `./configure --disable-shared && make -j2 2>&1`
+        if $?.to_i != 0 then
+            printf(" failed\n%s\n", compilation_log)
+            exit(1)
+        end
+        printf(" done\n")
+    }
+
+    $cjpeg = Shellwords.escape(File.join(ljtname, "cjpeg"))
+    $djpeg = Shellwords.escape(File.join(ljtname, "djpeg"))
+end
+
+# Check if we have the right cjpeg and djpeg
+if not `#{$djpeg} -v </dev/null 2>&1` =~ /libjpeg\-turbo/ or
+   not `#{$cjpeg} -v </dev/null 2>&1` =~ /libjpeg\-turbo/
+then
+    printf("The cjpeg and djpeg tools from libjpeg-turbo are not found.\n")
+    printf("Trying to download and compile them.\n")
+    download_and_compile_libjpeg_turbo()
+end
+
+###############################################################################
+
+def create_random_jpg(filename, width, height)
+    IO.popen(sprintf("#{$cjpeg} -q 95 > %s", Shellwords.escape(filename)), "wb") {|fh|
+         fh.printf("P3\n%d %d\n255\n", width, height)
+         fh.write(Random.new(0).bytes(3 * width * height).bytes.to_a.map {|x|
+                  x.to_s }.join(" "))
+    }
+end
+
+def read_file(filename)
+    return if not File.exists?(filename)
+    fh = File.open(filename, "rb")
+    data = fh.read
+    fh.close
+    return data
+end
+
+def write_file(filename, data)
+    begin
+        fh = File.open(filename, "wb")
+        fh.write(data)
+        fh.close
+    rescue
+        return false
+    end
+    return true
+end
+
+def set_userspace_governor(core)
+    write_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/scaling_governor", "userspace")
+    governor = read_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/scaling_governor")
+    return false if not governor
+    return governor.strip == "userspace"
+end
+
+def set_freq(core, freq)
+    write_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/scaling_setspeed", freq.to_s)
+    cur_freq = read_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/scaling_cur_freq")
+    return false if not cur_freq
+    return cur_freq.to_i == freq
+end
+
+def get_freq_list(core)
+    freq_list = read_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/scaling_available_frequencies")
+    if not freq_list then
+        freq_list = read_file("/sys/devices/system/cpu/cpu#{core}/cpufreq/stats/time_in_state")
+        return [] if not freq_list
+        return freq_list.split(/\s+/).each_slice(2).map {|x| x[0].to_i}
+    end
+    return freq_list.split(" ").map {|x| x.to_i}
+end
+
+jpgname = File.join(File.dirname(__FILE__), "whitenoise-1920x1080.jpg")
+shellescaped_jpgname = Shellwords.escape(jpgname)
+
+if not File.exists?(jpgname) then
+    printf("Creating '%s' ...", jpgname)
+    create_random_jpg(jpgname, 1920, 1080)
+    printf(" done\n")
+end
+
+number_of_cpu_cores = `nproc`.to_i
+
+test_failed = false
+
+min_freq = 0
+max_freq = 10000
+
+printf("CPU stress test, which is doing JPEG decoding by libjpeg-turbo\n")
+printf("at different cpufreq operating points.\n")
+
+if ARGV[0] and ARGV[1] then
+    min_freq = [ARGV[0].to_i, ARGV[1].to_i].min
+    max_freq = [ARGV[0].to_i, ARGV[1].to_i].max
+    printf("\nTesting CPU clock frequencies between %d MHz and %d MHz\n",
+           min_freq, max_freq)
+end
+
+0.upto(number_of_cpu_cores - 1) {|core|
+    printf("\nTesting CPU %d\n", core)
+    if not set_userspace_governor(core) then
+        raise "Can't set the userspace cpufreq governor"
+    end
+
+    freq_list = get_freq_list(core)
+    freq_list.sort.reverse.each {|freq|
+        printf("%5d MHz ", freq / 1000)
+        if freq < min_freq * 1000 or freq > max_freq * 1000 or not set_freq(core, freq)
+        then
+            printf("SKIPPED\n")
+            next
+        end
+        subtest_failed = false
+        expected_result = `taskset -c #{core} #{$djpeg} #{shellescaped_jpgname} | md5sum`
+        1.upto(60) {
+            printf(".")
+            STDOUT.flush
+            if `taskset -c #{core} #{$djpeg} #{shellescaped_jpgname} | md5sum` != expected_result
+            then
+                subtest_failed = true
+                break
+            end
+        }
+        test_failed = true if subtest_failed
+        printf(subtest_failed ? " FAILED\n" : " OK\n")
+    }
+}
+
+printf("\nOverall result : %s\n", (test_failed ? "FAILED" : "PASSED"))
diff --git a/cpuburn/gnuplot-sunxi-cpufreq b/cpuburn/gnuplot-sunxi-cpufreq
new file mode 100644
index 0000000..ba80b39
--- a/dev/null
+++ b/cpuburn/gnuplot-sunxi-cpufreq
@@ -0,0 +1,112 @@
+#!/usr/bin/env ruby
+#
+# Copyright © 2014 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+require 'tempfile'
+
+# Test the availability of the required tools
+
+def tool_exists(tool_name)
+    `which #{tool_name} > /dev/null 2>&1`
+    if $?.to_i != 0 then
+        printf("Error: the required '%s' executable is not found in PATH\n", tool_name)
+        return false
+    else
+        return true
+    end
+end
+
+exit(1) if not tool_exists("gnuplot")
+
+pngfile = nil
+cpufreq_src_files = []
+
+ARGV.each {|a|
+    if a =~ /\.png$/ then
+        pngfile = a
+    else
+        cpufreq_src_files.push(a) if File.exists?(a)
+    end
+}
+
+if not pngfile or cpufreq_src_files.size == 0 then
+    printf("Usage: #{$PROGRAM_NAME} <png_file> <cpufreq_src_file> [cpufreq_src_file]\n")
+    printf("Where:\n")
+    printf("    png_file         - resulting PNG file with the plot.\n")
+    printf("    cpufreq_src_file - source file with the cpufreq table\n")
+    printf("                       to parse (from the sunxi-3.4 kernel).\n")
+    exit(1)
+end
+
+data = {}
+# Parse the linux-sunxi cpufreq tables
+tablename = nil
+cpufreq_src_files.each {|filename|
+    File.open(filename).each_line {|l|
+        if l =~ /static struct cpufreq_dvfs (.*?)[_]?dvfs_table\[\]/ then
+            tablename = $1
+            tablename = "unknown" if tablename == ""
+            data[tablename] = [] if not data.has_key?(tablename)
+        end
+        if l =~ /\.freq\s*\=\s*(\d+),\s*\.volt\s*\=\s*(\d+)/ then
+            freq = $1.to_i / 1000000
+            volt = $2.to_f / 1000
+            if freq == 0 then
+                tablename = nil
+            end
+            data[tablename].push([freq, volt]) if tablename
+        end
+    }
+}
+
+# Prepare and feed data to gnuplot
+tmpfiles = {}
+data.each {|tablename, data|
+    tmpfiles[tablename] = Tempfile.new(tablename)
+    data.each {|v|
+        tmpfiles[tablename].printf("%f %f\n", v[0], v[1])
+    }
+    tmpfiles[tablename].flush
+}
+
+IO.popen("gnuplot", "w") {|fh|
+    fh.write "
+        set terminal png size 1600, 900
+        set output '#{pngfile}'
+        set format y '%.3f'
+        set xtics 48
+        set ytics 0.025
+        set grid xtics ytics
+        set yrange [0.9:1.575]
+        set xlabel 'CPU clock frequency, MHz'
+        set ylabel 'Required core voltage for reliable operation, V'
+        set style line 1 lc rgb 'blue' linewidth 10
+        set style line 2 lc rgb 'cyan' linewidth 8
+        set style line 3 lc rgb 'orange' linewidth 6
+        set style line 4 lc rgb 'brown' linewidth 4
+    "
+    plotdata = data.sort.map.with_index {|x, i|
+        "'%s' using 1:2 with linespoints ls #{i + 1} title '%s'" %
+                                        [tmpfiles[x[0]].path, x[0]]
+    }
+    fh.printf("plot %s\n", plotdata.join(","))
+}