gistfile1.c

//----------------------------------------------------------------
//ログ入れたコード
int exynos_smc_read_oemflag(u32 ctrl_word, u32 *val)
{
#if 1
  register u32 reg0 __asm__("r0");
	register u32 reg1 __asm__("r1");
	register u32 reg2 __asm__("r2");
	register u32 reg3 __asm__("r3");
	u32 idx = 0;

	for (idx = 0; reg2 != ctrl_word; idx++) {
		reg0 = -202;
		reg1 = 1;
		reg2 = idx;
		LOG(KERN_INFO "[%s:sta] %x %x %x %x  ", __func__,reg0,reg1,reg2,reg3   );
		__asm__ volatile ("smc    0\n":"+r" (reg0), "+r"(reg1),
				  "+r"(reg2), "+r"(reg3)
		    );
		LOG(KERN_INFO "[%s:end] %x %x %x %x  ", __func__,reg0,reg1,reg2,reg3   );
		if (reg1)
			return -1;
	}

	reg0 = -202;
	reg1 = 1;
	reg2 = idx;

	LOG(KERN_INFO "[%s:sta] %x %x %x %x  ", __func__,reg0,reg1,reg2,reg3   );
	__asm__ volatile ("smc    0\n":"+r" (reg0), "+r"(reg1), "+r"(reg2),
			  "+r"(reg3)
	    );
	LOG(KERN_INFO "[%s:end] %x %x %x %x  ", __func__,reg0,reg1,reg2,reg3   );
	if (reg1)
		return -1;

	*val = reg2;
#else
	*val = 0;
#endif
	return 0;
}

//----------------------------------------------------------------
// 出力
/*
<6>System has 4 CPU's, we are on CPU #0
<6>  Binding this process to CPU #0.
<6>	active mask is 1, setting it to mask=1
<6>And now we are on CPU #0
<6>get_fuse
<6>[exynos_smc_read_oemflag:sta] ffffff36 1 0 0  
<6>[exynos_smc_read_oemflag:end] 0 2f31000 1 0  
<6>System has 4 CPU's, we are on CPU #0
<6>	Binding this process to CPU #0.
<6>	active mask is 1, setting it to mask=f
<6>And now we are on CPU #0
*/

これの２１行目でreg=0x2f31000 なのでretuenしてるようだ・・・