CPU init stuff. TODO: check for LPSTOP (040), and cpu model (must be >= 020).

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23449 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/boot/platform/atari_m68k/cpu.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * calculate_cpu_conversion_factor() was written by Travis Geiselbrecht and
+ * licensed under the NewOS license.
+ */
+
+
+#include "cpu.h"
+
+#include <OS.h>
+#include <boot/platform.h>
+#include <boot/stdio.h>
+#include <boot/kernel_args.h>
+#include <boot/stage2.h>
+#include <arch/cpu.h>
+#include <arch_kernel.h>
+#include <arch_system_info.h>
+
+#include <string.h>
+
+
+//#define TRACE_CPU
+#ifdef TRACE_CPU
+#	define TRACE(x) dprintf x
+#else
+#	define TRACE(x) ;
+#endif
+
+bool gCpuHasLPSTOP = false;
+
+static status_t
+check_cpu_features()
+{
+#warning M68K: check for LPSTOP
+	if (false)
+		gCpuHasLPSTOP = true;
+
+#warning M68K: check for >= 020
+
+	return B_OK;
+}
+
+
+//	#pragma mark -
+
+
+extern "C" void
+spin(bigtime_t microseconds)
+{
+	bigtime_t time = system_time();
+	if (gCpuHasLPSTOP) {
+		while ((system_time() - time) < microseconds)
+			asm volatile ("lpstop;");
+	} else {
+		while ((system_time() - time) < microseconds)
+			asm volatile ("nop;");
+	}
+}
+
+
+extern "C" void
+cpu_init()
+{
+	if (check_cpu_features() != B_OK)
+		panic("You need a 68020 or higher in order to boot!\n");
+
+	gKernelArgs.num_cpus = 1;
+		// this will eventually be corrected later on
+		// ...or not!
+}
+

src/system/boot/platform/atari_m68k/cpu.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef CPU_H
+#define CPU_H
+
+
+#include <SupportDefs.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void cpu_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* CPU_H */