Initial commit of the platform independent part of the new stage2 boot loader.

Not yet complete, of course, but already scans amiga partitions :-)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4461 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/boot/loader/partitions.cpp

@@ -0,0 +1,124 @@
+/*
+** Copyright 2003, Axel Dörfler, [email protected]. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+
+
+#include <boot/partitions.h>
+#include <boot/vfs.h>
+#include <boot/stdio.h>
+#include <ddm_modules.h>
+#include <util/kernel_cpp.h>
+
+#include <unistd.h>
+#include <string.h>
+
+
+static partition_module_info *sPartitionModules[] = {
+#ifdef BOOT_SUPPORT_PARTITION_AMIGA
+	&gAmigaPartitionModule,
+#endif
+#ifdef BOOT_SUPPORT_PARTITION_INTEL
+	&gIntelPartitionModule,
+#endif
+#ifdef BOOT_SUPPORT_PARTITION_APPLE
+	&gApplePartitionModule,
+#endif
+};
+static const int32 sNumPartitionModules = sizeof(sPartitionModules) / sizeof(partition_module_info *);
+
+extern list gPartitions;
+
+
+Partition::Partition(int fd)
+{
+	// it's safe to close the file
+	fFD = dup(fd);
+}
+
+
+Partition::~Partition()
+{
+	close(fFD);
+}
+
+
+ssize_t 
+Partition::ReadAt(void *cookie, off_t position, void *buffer, size_t bufferSize)
+{
+	if (position > this->size)
+		return 0;
+	if (position < 0)
+		position = 0;
+
+	if (position + bufferSize > this->size)
+		bufferSize = this->size - position;
+
+	return read_pos(fFD, this->offset + position, buffer, bufferSize);
+}
+
+
+ssize_t 
+Partition::WriteAt(void *cookie, off_t position, const void *buffer, size_t bufferSize)
+{
+	if (position > this->size)
+		return 0;
+	if (position < 0)
+		position = 0;
+
+	if (position + bufferSize > this->size)
+		bufferSize = this->size - position;
+
+	return write_pos(fFD, this->offset + position, buffer, bufferSize);
+}
+
+
+//	#pragma mark -
+
+
+status_t
+add_partitions_for(int fd)
+{
+	struct partition_data partition;
+	memset(&partition, 0, sizeof(partition_data));
+
+	// set some magic/default values
+	partition.id = (partition_id)&partition;
+	partition.block_size = 512;
+	partition.size = 1024*1024*1024; // ToDo: fix this!
+	partition.volume = (dev_t)fd;
+
+	for (int32 i = 0; i < sNumPartitionModules; i++) {
+		partition_module_info *module = sPartitionModules[i];
+		void *cookie;
+
+		puts(module->pretty_name);
+		if (module->identify_partition(fd, &partition, &cookie) <= 0.0)
+			continue;
+
+		status_t status = module->scan_partition(fd, &partition, cookie);
+		module->free_identify_partition_cookie(&partition, cookie);
+
+		if (status == B_OK)
+			return B_OK;
+	}
+	return B_ENTRY_NOT_FOUND; 
+}
+
+
+partition_data *
+create_child_partition(partition_id id, int32 index, partition_id childID)
+{
+	partition_data &partition = *(partition_data *)id;
+	Partition *child = new Partition(partition.volume);
+	if (child == NULL) {
+		printf("creating partition failed: no memory\n");
+		return NULL;
+	}
+
+	list_add_item(&gPartitions, (void *)child);
+
+	return child;
+}
+
+