From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Mon, 29 Apr 2019 01:17:54 +0100
Subject: Initial import of qemu-2.4.1

---
 roms/u-boot/arch/powerpc/lib/interrupts.c | 127 ++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 roms/u-boot/arch/powerpc/lib/interrupts.c

(limited to 'roms/u-boot/arch/powerpc/lib/interrupts.c')

diff --git a/roms/u-boot/arch/powerpc/lib/interrupts.c b/roms/u-boot/arch/powerpc/lib/interrupts.c
new file mode 100644
index 00000000..f7cf9157
--- /dev/null
+++ b/roms/u-boot/arch/powerpc/lib/interrupts.c
@@ -0,0 +1,127 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2003
+ * Gleb Natapov <gnatapov@mrv.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <watchdog.h>
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#endif
+
+#ifdef CONFIG_SHOW_ACTIVITY
+void board_show_activity (ulong) __attribute__((weak, alias("__board_show_activity")));
+
+void __board_show_activity (ulong dummy)
+{
+	return;
+}
+#endif /* CONFIG_SHOW_ACTIVITY */
+
+#ifndef CONFIG_SYS_WATCHDOG_FREQ
+#define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
+#endif
+
+extern int interrupt_init_cpu (unsigned *);
+extern void timer_interrupt_cpu (struct pt_regs *);
+
+static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
+
+static __inline__ unsigned long get_msr (void)
+{
+	unsigned long msr;
+
+	asm volatile ("mfmsr %0":"=r" (msr):);
+
+	return msr;
+}
+
+static __inline__ void set_msr (unsigned long msr)
+{
+	asm volatile ("mtmsr %0"::"r" (msr));
+}
+
+static __inline__ unsigned long get_dec (void)
+{
+	unsigned long val;
+
+	asm volatile ("mfdec %0":"=r" (val):);
+
+	return val;
+}
+
+
+static __inline__ void set_dec (unsigned long val)
+{
+	if (val)
+		asm volatile ("mtdec %0"::"r" (val));
+}
+
+
+void enable_interrupts (void)
+{
+	set_msr (get_msr () | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int disable_interrupts (void)
+{
+	ulong msr = get_msr ();
+
+	set_msr (msr & ~MSR_EE);
+	return ((msr & MSR_EE) != 0);
+}
+
+int interrupt_init (void)
+{
+	int ret;
+
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	ret = interrupt_init_cpu (&decrementer_count);
+
+	if (ret)
+		return ret;
+
+	set_dec (decrementer_count);
+
+	set_msr (get_msr () | MSR_EE);
+
+	return (0);
+}
+
+static volatile ulong timestamp = 0;
+
+void timer_interrupt (struct pt_regs *regs)
+{
+	/* call cpu specific function from $(CPU)/interrupts.c */
+	timer_interrupt_cpu (regs);
+
+	/* Restore Decrementer Count */
+	set_dec (decrementer_count);
+
+	timestamp++;
+
+#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
+	if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0)
+		WATCHDOG_RESET ();
+#endif    /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
+
+#ifdef CONFIG_STATUS_LED
+	status_led_tick (timestamp);
+#endif /* CONFIG_STATUS_LED */
+
+#ifdef CONFIG_SHOW_ACTIVITY
+	board_show_activity (timestamp);
+#endif /* CONFIG_SHOW_ACTIVITY */
+}
+
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
-- 
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