Start code I'll work on tomorrow^Wtoday.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23381 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/boot/platform/atari_m68k/start.c

@@ -0,0 +1,135 @@
+/*
+ * Copyright 2003-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <KernelExport.h>
+#include <boot/platform.h>
+#include <boot/heap.h>
+#include <boot/stage2.h>
+#include <arch/cpu.h>
+
+#include <string.h>
+
+#include "console.h"
+#include "cpu.h"
+#include "mmu.h"
+#include "keyboard.h"
+#include "toscalls.h"
+
+
+#define HEAP_SIZE 65536
+
+// GCC defined globals
+extern void (*__ctor_list)(void);
+extern void (*__ctor_end)(void);
+extern uint8 __bss_start;
+extern uint8 _end;
+
+extern int main(stage2_args *args);
+void _start(void);
+
+
+uint32 sBootOptions;
+
+
+static void
+clear_bss(void)
+{
+	memset(&__bss_start, 0, &_end - &__bss_start);
+}
+
+
+static void
+call_ctors(void)
+{ 
+	void (**f)(void);
+
+	for (f = &__ctor_list; f < &__ctor_end; f++) {		
+		(**f)();
+	}
+}
+
+
+uint32
+platform_boot_options(void)
+{
+#if 0
+	if (!gKernelArgs.fb.enabled)
+		sBootOptions |= check_for_boot_keys();
+#endif
+	return sBootOptions;
+}
+
+
+void
+platform_start_kernel(void)
+{
+	static struct kernel_args *args = &gKernelArgs;
+		// something goes wrong when we pass &gKernelArgs directly
+		// to the assembler inline below - might be a bug in GCC
+		// or I don't see something important...
+	addr_t stackTop = gKernelArgs.cpu_kstack[0].start + gKernelArgs.cpu_kstack[0].size;
+
+	smp_init_other_cpus();
+	serial_cleanup();
+	mmu_init_for_kernel();
+	smp_boot_other_cpus();
+
+	dprintf("kernel entry at %lx\n", gKernelArgs.kernel_image.elf_header.e_entry);
+
+	asm("movl	%0, %%eax;	"			// move stack out of way
+		"movl	%%eax, %%esp; "
+		: : "m" (stackTop));
+	asm("pushl  $0x0; "					// we're the BSP cpu (0)
+		"pushl 	%0;	"					// kernel args
+		"pushl 	$0x0;"					// dummy retval for call to main
+		"pushl 	%1;	"					// this is the start address
+		"ret;		"					// jump.
+		: : "g" (args), "g" (gKernelArgs.kernel_image.elf_header.e_entry));
+
+	panic("kernel returned!\n");
+}
+
+
+void
+platform_exit(void)
+{
+	// reset the system using the keyboard controller
+	out8(0xfe, 0x64);
+}
+
+
+void
+_start(void)
+{
+	stage2_args args;
+
+	asm("cld");			// Ain't nothing but a GCC thang.
+	asm("fninit");		// initialize floating point unit
+
+	clear_bss();
+	call_ctors();
+		// call C++ constructors before doing anything else
+
+	args.heap_size = HEAP_SIZE;
+
+	//serial_init();
+	console_init();
+	cpu_init();
+	mmu_init();
+
+	// wait a bit to give the user the opportunity to press a key
+	spin(750000);
+
+	// reading the keyboard doesn't seem to work in graphics mode (maybe a bochs problem)
+	sBootOptions = check_for_boot_keys();
+	//if (sBootOptions & BOOT_OPTION_DEBUG_OUTPUT)
+		serial_enable();
+
+	//apm_init();
+	//smp_init();
+	main(&args);
+}
+