From 23b4c9d5dbead4764023d196c5e90cffec7ac5ff Mon Sep 17 00:00:00 2001
From: Bahadir Balban <bbalban@b-labs.co.uk>
Date: Fri, 17 Apr 2009 15:18:42 +0300
Subject: [PATCH] Moved boot-related functions to boot.c

---
 tasks/mm0/src/boot.c | 128 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 tasks/mm0/src/boot.c

diff --git a/tasks/mm0/src/boot.c b/tasks/mm0/src/boot.c
new file mode 100644
index 0000000..9a2d260
--- /dev/null
+++ b/tasks/mm0/src/boot.c
@@ -0,0 +1,128 @@
+/*
+ * Functions used for running initial tasks during boot.
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#include <boot.h>
+#include <mmap.h>
+#include <utcb.h>
+#include <shm.h>
+#include <l4/api/thread.h>
+#include <l4lib/arch/syslib.h>
+
+int boottask_setup_regions(struct vm_file *file, struct tcb *task,
+			   unsigned long task_start, unsigned long task_end)
+{
+	/*
+	 * Set task's main address space boundaries. Not all tasks
+	 * run in the default user boundaries, e.g. mm0 pager.
+	 */
+	task->start = task_start;
+	task->end = task_end;
+
+	/* Task stack starts right after the environment. */
+	task->stack_end = task->end;
+	task->stack_start = task->stack_end - DEFAULT_STACK_SIZE;
+
+	/* Prepare environment boundaries. */
+	task->args_end = task->stack_end;
+	task->args_start = task->stack_start - DEFAULT_ENV_SIZE;
+
+	/* Currently RO text and RW data are one region. TODO: Fix this */
+	task->data_start = task->start;
+	task->data_end = task->start + page_align_up(file->length);
+	task->text_start = task->data_start;
+	task->text_end = task->data_end;
+	task->entry = task->text_start;
+
+	/* Task's region available for mmap */
+	task->map_start = task->data_end;
+	task->map_end = task->stack_start;
+
+	return 0;
+}
+
+/*
+ * Used for mmapping boot task regions. These are slightly different
+ * from a vfs executable file.
+ */
+int boottask_mmap_regions(struct tcb *task, struct vm_file *file)
+{
+	void *mapped;
+	struct vm_file *shm;
+
+	/*
+	 * mmap each task's physical image to task's address space.
+	 * TODO: Map data and text separately when available from bootdesc.
+	 */
+	if (IS_ERR(mapped = do_mmap(file, 0, task, task->text_start,
+				    VM_READ | VM_WRITE | VM_EXEC | VMA_PRIVATE,
+				    __pfn(page_align_up(task->text_end) -
+				    task->text_start)))) {
+		printf("do_mmap: failed with %d.\n", (int)mapped);
+		return (int)mapped;
+	}
+
+	/* mmap each task's stack as anonymous memory. */
+	if (IS_ERR(mapped = do_mmap(0, 0, task, task->stack_start,
+				    VM_READ | VM_WRITE |
+				    VMA_PRIVATE | VMA_ANONYMOUS,
+				    __pfn(task->stack_end -
+					  task->stack_start)))) {
+		printf("do_mmap: Mapping stack failed with %d.\n",
+		       (int)mapped);
+		return (int)mapped;
+	}
+
+	/* Task's utcb */
+	task->utcb = utcb_new_address();
+
+	/* Create a shared memory segment available for shmat() */
+	if (IS_ERR(shm = shm_new((key_t)task->utcb, __pfn(DEFAULT_UTCB_SIZE))))
+		return (int)shm;
+
+	return 0;
+}
+
+/*
+ * Main entry point for the creation, initialisation and
+ * execution of a new task.
+ */
+struct tcb *boottask_exec(struct vm_file *f, unsigned long task_region_start,
+			  unsigned long task_region_end, struct task_ids *ids)
+{
+	struct tcb *task;
+	int err;
+
+	if (IS_ERR(task = task_create(0, ids, THREAD_NEW_SPACE,
+				      TCB_NO_SHARING)))
+		return task;
+
+	if ((err = boottask_setup_regions(f, task, task_region_start,
+					  task_region_end)) < 0)
+		return PTR_ERR(err);
+
+	if ((err = boottask_mmap_regions(task, f)) < 0)
+		return PTR_ERR(err);
+
+	if ((err =  task_setup_registers(task, 0, 0, 0)) < 0)
+		return PTR_ERR(err);
+
+	/* Add the task to the global task list */
+	global_add_task(task);
+
+	/* Add the file to global vm lists */
+	global_add_vm_file(f);
+
+	/* Prefault all its regions */
+	if (ids->tid == VFS_TID)
+		task_prefault_regions(task, f);
+
+	/* Start the task */
+	if ((err = task_start(task)) < 0)
+		return PTR_ERR(err);
+
+	return task;
+}
+
+