Add stubs for process-related functions.

1 files changed, 124 insertions, 1 deletions

diff --git a/src/kernel/user/process.c b/src/kernel/user/process.c
index 22295ef..7b51370 100644
--- a/src/kernel/user/process.c
+++ b/src/kernel/user/process.c
@@ -1,13 +1,136 @@
 #include <mutex.h>
+#include <hashtbl.h>
+
 #include <process.h>
 
+typedef struct user_region {
+	void* addr;
+	size_t size;
+
+	int mode;
+
+	fs_handle_t *file;		// null if not mmaped-file
+	size_t file_offset;
+
+	struct user_region *next;
+} user_region_t;
+
 typedef struct process {
 	pagedir_t *pd;
+	user_region_t *regions;
+
+	hashtbl_t *filesystems;
 
 	thread_t *thread;
 
-	int pid, ppid;
+	int pid;
+	struct process *parent;
 } process_t;
 
+static int next_pid = 1;
+
+static void proc_kmem_violation(registers_t *regs);
+static void proc_user_pf(void* proc, registers_t *regs, void* addr);
+
+process_t *current_process() {
+	if (current_thread) return current_thread->proc;
+	return 0;
+}
+
+// ============================== //
+// CREATING AND RUNNING PROCESSES //
+// ============================== //
+
+process_t *new_process(process_t *parent) {
+	process_t *proc = (proces_t*)malloc(sizeof(process_t));
+	if (proc == 0) return 0;
+
+	proc->filesystems = create_hashtbl(str_key_eq_fun, str_hash_fun, free, 0);
+	if (proc->filesystems == 0) {
+		free(proc);
+		return 0;
+	}
+
+	proc->pd = pagedir_create(proc_user_pf, proc);
+	if (proc->pd == 0) {
+		delete_hashtbl(proc->filesystems, 0);
+		free(proc);
+		return 0;
+	}
+
+	proc->regions = 0;
+	proc->thread = 0;
+	proc->pid = (next_pid++);
+	proc->parent = parent;
+
+	return proc;
+}
+
+static void run_user_code(void* data) {
+	// TODO
+	exit();
+}
+bool start_process(process_t *p, void* entry) {
+	// TODO
+}
+
+// ================================== //
+// MANAGING FILESYSTEMS FOR PROCESSES //
+// ================================== //
+
+bool proc_add_fs(process_t *p, fs_t *fs, const char* name) {
+	char *n = strdup(name);
+	if (n == 0) return false;
+
+	bool add_ok = hashtbl_add(p->filesystems, n, fs);
+	if (!add_ok) {
+		free(n);
+		return false;
+	}
+
+	return true;
+}
+
+fs_t *proc_find_fs(process_t *p, const char* name) {
+	return hashtbl_find(p->filesystems, name);
+}
+
+// ============================= //
+// USER MEMORY REGION MANAGEMENT //
+// ============================= //
+
+bool mmap(process_t *proc, void* addr, size_t size, int mode) {
+	//TODO
+	return false;
+}
+
+bool mmap_file(process_t *proc, fs_handle_t *h, size_t offset, void* addr, size_t size, int mode) {
+	//TODO
+	return false;
+}
+
+bool mchmap(process_t *proc, void* addr, int mode) {
+	//TODO
+	return false;
+}
+
+bool munmap(process_t *proc, void* addr) {
+	//TODO
+	return false;
+}
+
+// =============================== //
+// USER MEMORY PAGE FAULT HANDLERS //
+// =============================== //
+
+static void proc_kmem_violation(registers_t *regs) {
+	//TODO
+	dbg_printf("Kernel memory violation in user process : exiting.\n");
+	exit();
+}
+static void proc_user_pf(void* proc, registers_t *regs, void* addr) {
+	//TODO
+	PANIC("TODO");
+}
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/