From: Ben Gras <ben@minix3.org>
Date: Sun, 16 Jun 2013 22:33:47 +0000 (+0200)
Subject: kernel, libsys: make it arm-target-independent
X-Git-Tag: v3.3.0~917
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=5bc48ef12eb28bace0057ae2c9caae49f9d4cf16;p=minix.git

kernel, libsys: make it arm-target-independent

	. by making the address and frequency of the
	  free running clock kinfo members, set at runtime
	  in the kernel, instead of compile time constants
	  in libsys

Change-Id: I4a8387302d4d3ffd47d2448525725683a74c9a4f
---

diff --git a/include/minix/type.h b/include/minix/type.h
index 29e59bcba..b6ed40d44 100644
--- a/include/minix/type.h
+++ b/include/minix/type.h
@@ -168,7 +168,7 @@ struct minix_kerninfo {
 	u32_t kerninfo_magic;
 	u32_t minix_feature_flags;	/* features in minix kernel */
 	u32_t ki_flags;			/* what is present in this struct */
-	u32_t minix_frclock;
+	u32_t minix_frclock_tcrr;
 	u32_t flags_unused3;
 	u32_t flags_unused4;
 	struct kinfo		*kinfo;
@@ -176,6 +176,7 @@ struct minix_kerninfo {
 	struct kmessages	*kmessages;
 	struct loadinfo		*loadinfo;
 	struct minix_ipcvecs	*minix_ipcvecs;
+	u64_t minix_arm_frclock_hz;	/* minix_frclock_tcrr frequency */
 } __packed;
 
 #define MINIX_KIF_IPCVECS	(1L << 0)
diff --git a/kernel/arch/earm/memory.c b/kernel/arch/earm/memory.c
index 0e7e449af..9ff7acab6 100644
--- a/kernel/arch/earm/memory.c
+++ b/kernel/arch/earm/memory.c
@@ -790,11 +790,14 @@ int arch_phys_map_reply(const int index, const vir_bytes addr)
 		return OK;
 	}
 	else if (index == frclock_index) {
-#ifdef DM37XX
-		minix_kerninfo.minix_frclock = addr;
-#endif
-#ifdef AM335X
-		minix_kerninfo.minix_frclock = addr;
+#if defined(DM37XX)
+		minix_kerninfo.minix_frclock_tcrr = addr + OMAP3_TIMER_TCRR;
+		minix_kerninfo.minix_arm_frclock_hz = 1625000;
+#elif defined(AM335X) 
+		minix_kerninfo.minix_frclock_tcrr = addr + AM335X_TIMER_TCRR;
+		minix_kerninfo.minix_arm_frclock_hz = 1500000;
+#else
+#error ARM: plese define either AM335X or DM37XX.
 #endif
 
 		return OK;
diff --git a/lib/libsys/arch/earm/frclock_util.c b/lib/libsys/arch/earm/frclock_util.c
index b3bd2d0c0..c32b50151 100644
--- a/lib/libsys/arch/earm/frclock_util.c
+++ b/lib/libsys/arch/earm/frclock_util.c
@@ -11,18 +11,13 @@
 #include <sys/types.h>
 #include <assert.h>
 
-#ifdef DM37XX
-//keesj:todo we don't want to hardcode these values here but ratter
-//get them using a system call. the same applies for the time offset
-static u64_t calib_hz = 1625000, Hz;
-#endif
-#ifdef AM335X
-static u64_t calib_hz = 1500000, Hz;
-#endif
-
 #define MICROHZ         1000000ULL	/* number of micros per second */
 #define MICROSPERTICK(h)	(MICROHZ/(h)) /* number of micros per HZ tick */
 
+static u64_t Hz;
+
+extern struct minix_kerninfo *_minix_kerninfo;
+
 int
 micro_delay(u32_t micros)
 {
@@ -32,7 +27,8 @@ micro_delay(u32_t micros)
 
         /* Start of delay. */
         read_frclock_64(&start);
-	delta_end = (calib_hz * micros) / MICROHZ;
+	assert(_minix_kerninfo->minix_arm_frclock_hz);
+	delta_end = (_minix_kerninfo->minix_arm_frclock_hz * micros) / MICROHZ;
 
         /* If we have to wait for at least one HZ tick, use the regular
          * tickdelay first. Round downwards on purpose, so the average
@@ -54,23 +50,16 @@ micro_delay(u32_t micros)
 
 u32_t frclock_64_to_micros(u64_t tsc)
 {
-        return (u32_t) tsc / (calib_hz / MICROHZ);
+        return (u32_t) tsc / (_minix_kerninfo->minix_arm_frclock_hz / MICROHZ);
 }
 
 void
 read_frclock(u32_t *frclk)
 {
-	extern struct minix_kerninfo *_minix_kerninfo;
-	volatile u32_t *frclock;
-
 	assert(frclk);
-#ifdef DM37XX
-	frclock = (u32_t *)((u8_t *) _minix_kerninfo->minix_frclock + OMAP3_TIMER_TCRR);
-#endif
-#ifdef AM335X
-	frclock = (u32_t *)((u8_t *) _minix_kerninfo->minix_frclock + AM335X_TIMER_TCRR);
-#endif
-	*frclk = *frclock;
+	assert(_minix_kerninfo->minix_frclock_tcrr);
+	assert(_minix_kerninfo->minix_arm_frclock_hz);
+	*frclk = *(volatile u32_t *)((u8_t *) _minix_kerninfo->minix_frclock_tcrr);
 }
 
 u32_t