2011年10鐃緒申12鐃緒申
ARM Linux鐃塾ユー鐃緒申鐃竣ワ申鐃緒申鐃緒申爐�鐃緒申Cortex-A9鐃塾ワ申鐃緒申鐃緒申鐃暑カ鐃緒申鐃藷タわ申鐃緒申鐃術わ申鐃緒申
鐃緒申鐃緒申鐃緒申鐃緒申Cortex-A9鐃塾ワ申鐃緒申鐃緒申鐃暑カ鐃緒申鐃藷タわ申鐃緒申鐃術わ申鐃緒申鐃緒申単鐃淑実行誌申鐃瞬の件申測鐃緒申法鐃竣とわ申鐃緒申鐃緒申鐃緒申鐃緒申颪�まわ申鐃緒申鐃緒申鐃緒申鐃塾とわ申鐃祝わ申鐃獣醐申鐃盾ー鐃宿で誌申鐃術わ申鐃暑こ鐃夙わ申鐃緒申鐃緒申箸鐃緒申討鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申竜鐃緒申鐃緒申虜埜鐃祝わ申颪い鐃緒申箸鐃緒申蝓�鐃醇ー鐃緒申鐃緒申鐃盾ー鐃宿わ申鐃緒申僖侫鐃緒申鐃緒申泪鵐好鐃祝ワ申鐃塾レジ鐃緒申鐃緒申鐃祝ワ申鐃緒申鐃緒申鐃緒申鐃緒申鐃暑た鐃緒申砲呂鐃緒申蕕�鐃緒申鐃緒申User Enable Register(PMUSERENR)鐃祝てワ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申弔鐃緒申討鐃緒申鐃宿�鐃竣わ申鐃緒申鐃緒申泙鐃緒申鐃緒申鐃獣縁申淵鐃緒申鐃緒申優鐃盾ジ鐃遵ー鐃緒申鐃緒申辰討鐃緒申鐃緒申鐃獣てみまわ申鐃緒申鐃緒申
鐃緒申鐃緒申鐃粛ワ申皀醐申紂種申鐃塾削申鐃緒申
鐃醇ー鐃緒申鐃緒申鐃盾ー鐃宿わ申鐃緒申鐃�Performance Monitoring Unit鐃舜のワ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申弔鐃緒申鐃祝は￥申鐃緒申鐃初か鐃緒申鐃緒申鐃獣醐申鐃盾ー鐃宿わ申PMUSERENR鐃曙ジ鐃緒申鐃緒申鐃緒申bit0鐃緒申立鐃銃てわ申鐃緒申必鐃竣わ申鐃緒申鐃緒申泙鐃緒申鐃緒申椶鐃緒申鐃緒申鐃�ARM鐃緒申Architecture Reference Manual鐃薯見てわ申鐃緒申鐃緒申鐃緒申鐃緒申
鐃緒申鐃述に載ってわ申鐃暑カ鐃緒申鐃粛ワ申皀醐申紂種申鐃緒申任鐃�HelloWorld鐃塾ワ申鐃緒申鐃緒申鐃薯少わ申鐃術刻申鐃緒申鐃銃以駕申鐃緒申鐃緒申鐃緒申鐃緒申泙鐃緒申鐃緒申鐃緒申併鐃緒申佑砲鐃緒申鐃緒申里蓮鐃�Linux 鐃叔バワ申鐃緒申鐃宿ライ鐃出プワ申鐃緒申鐃緒申潺鵐亜鐃�)
pmuser.c
#include <linux/module.h>
#include <linux/init.h>
#define PMUSERENR_EN 0
MODULE_LICENSE("Dual BSD/GPL");
static int pmuser_init(void)
{
unsigned long x;
asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (x));
x |= 1 << PMUSERENR_EN;
asm volatile("mcr p15, 0, %0, c9, c14, 0" :: "r" (x));
printk(KERN_ALERT "Enabled accessing Performance Monitoring Unit from user space\n");
return 0;
}
static void pmuser_exit(void)
{
unsigned long x;
asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (x));
x &= ~(1 << PMUSERENR_EN);
asm volatile("mcr p15, 0, %0, c9, c14, 0" :: "r" (x));
printk(KERN_ALERT "Disabled accessing Performance Monitoring Unit from user space\n");
}
module_init(pmuser_init);
module_exit(pmuser_exit);
Makefile
obj-m := pmuser.o KERNEL_DIR = ../../kernel all: make -C $(KERNEL_DIR) M=$(PWD) modules clean: make -C $(KERNEL_DIR) M=$(PWD) clean
Makefile鐃緒申鐃�KERNEL_DIR鐃熟ワ申鐃緒申鐃粛ワ申鐃緒申鐃塾のワ申鐃緒申鐃緒申鐃塾デワ申鐃曙ク鐃夙ワ申鐃舜わ申鐃処う鐃祝緒申鐃緒申鐃緒申鐃銃わ申鐃緒申鐃緒申鐃緒申鐃緒申
鐃縮常申離鐃緒申鐃緒申優鐃塾ビワ申匹里茲�鐃祝￥申ARCH=arm, CROSS_COMPILE=... 鐃塾環駈申鐃術随申鐃薯セットわ申鐃銃わ申鐃緒申
$ make make -C ../../kernel M=/opt/koba/kzm/android/work/kernel_modules/pmuser modules make[1]: Entering directory `/opt/koba/kzm/work/kernel' CC [M] /opt/koba/kzm/work/kernel_modules/pmuser/pmuser.o Building modules, stage 2. MODPOST 1 modules LD [M] /opt/koba/kzm/work/kernel_modules/pmuser/pmuser.ko make[1]: Leaving directory `/opt/koba/kzm/work/kernel' $
鐃緒申鐃緒申如鐃�pmuser.ko 鐃緒申鐃叔わ申鐃殉わ申鐃緒申鐃緒申
鐃銃ワ申鐃夙プワ申鐃緒申鐃緒申鐃�
鐃緒申鐃緒申鐃塾居申鐃緒申鐃緒申同鐃緒申鐃緒申里鐃夙わ申鐃殉わ申鐃緒申
pmon_ca9.h
#ifndef __KMC_PMON_CA9_H
#define __KMC_PMON_CA9_H
/* Performance Monitor Control Register of Cortex A9*/
#define PMCR_D 3
#define PMCR_C 2
#define PMCR_E 0
#define PMCNTENSET_C 31
volatile __inline__ static unsigned long __attribute__((always_inline))
pmon_start_cycle_counter()
{
unsigned long x;
x = 1 << PMCNTENSET_C;
asm volatile("mcr p15, 0, %0, c9, c12, 1" :: "r" (x));
asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (x));
x |= ((1 << PMCR_D) | (1 << PMCR_C) | (1 << PMCR_E));
asm volatile("mcr p15, 0, %0, c9, c12, 0" :: "r" (x));
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (x));
return x;
}
volatile __inline__ static unsigned long __attribute__((always_inline))
pmon_read_cycle_counter()
{
unsigned long x;
asm volatile ("mrc p15, 0, %0, c9, c13, 0": "=r" (x));
return x;
}
#endif /* __KMC_PMON_CA9_H */
test.c
#include <stdio.h>
#include "pmon_ca9.h"
int func(int x)
{
int sum = 0;
int i;
for (i = 1; i <= x; i++) {
sum += i;
}
return sum;
}
int
main()
{
unsigned long start, end;
int x;
start = pmon_start_cycle_counter();
x = func(1000);
end = pmon_read_cycle_counter();
printf("time = %ld, x = %d\n", end - start, x);
return x;
}
鐃渋刻申鐃緒申
ARM Ubuntu鐃塾常申任鐃緒申離謄鐃緒申肇廛鐃緒申鐃緒申鐃緒申鐃俊ワ申匹鐃緒申銅孫圓鐃緒申討澆泙鐃緒申鐃�
user@arm-maverick:~/work/pmon$ gcc -o test test.c user@arm-maverick:~/work/pmon$ ls pmon_ca9.h pmuser.ko test test.c user@arm-maverick:~/work/pmon$ ./test Illegal instruction
鐃緒申鐃縮に実行わ申鐃緒申箸鐃緒申里茲�鐃緒申鐃純外鐃叔異常終了鐃緒申鐃銃わ申鐃殉わ申鐃殉わ申鐃緒申鐃醇ー鐃緒申鐃緒申鐃盾ー鐃宿でわ申PMU鐃塾ワ申鐃緒申鐃緒申鐃緒申鐃緒申鐃舜止わ申鐃緒申討鐃緒申襪�鐃緒申任鐃緒申鐃�
鐃緒申鐃緒申鐃獣わ申鐃緒申鐃緒申鐃粛ワ申皀醐申紂種申鐃緒申鐃緒申鐃緒申匹鐃緒申討鐃緒申蕁�鐃緒申鐃駿実行わ申鐃銃みまわ申鐃緒申
user@arm-maverick:~/work/pmon$ sudo insmod ./pmuser.ko user@arm-maverick:~/work/pmon$ ./test time = 146, x = 500500
鐃緒申鐃緒申蕕件申鐃銃逸申鐃緒申討鐃緒申鐃処う鐃叔わ申鐃緒申
2011.10.13 鐃宿居申
鐃緒申鐃緒申鐃緒申鐃�SMP(Symmetric Multiprocessing)鐃緒申鐃塾醐申鐃緒申討鐃緒申泙鐃緒申鐃�
鐃緒申鐃緒申鐃藷タわ申鐃緒申鐃緒申肇鐃緒申鐃緒申鵐燭鐃緒申匹濬个鐃緒申鐃緒申漫鐃緒申離鐃緒申鐃緒申納孫圓鐃緒申譴随申蕕�鐃緒申鐃緒申鐃緒申鐃淑わ申泙鐃緒申鐃�
鐃緒申連鐃緒申鐃緒申據鐃緒申鐃�
Cortex-A9鐃塾ワ申鐃緒申鐃緒申鐃暑カ鐃緒申鐃藷タわ申鐃緒申鐃術わ申鐃緒申鐃緒申単鐃淑実行誌申鐃瞬の件申測鐃緒申法
