kernel: refactor syscall dispatch system

kernel/syscall.c

@@ -1,40 +0,0 @@
-#include <mango/machine/cpu.h>
-#include <mango/printk.h>
-#include <mango/syscall.h>
-
-kern_status_t sys_exit(int status)
-{
-	printk("sys_exit(%d)", status);
-	while (1) {
-		ml_cpu_pause();
-	}
-	return KERN_UNIMPLEMENTED;
-}
-
-kern_status_t sys_vm_object_create(
-	const char *name,
-	size_t len,
-	enum vm_prot prot,
-	kern_handle_t *out_handle)
-{
-	printk("sys_vm_object_create()");
-	return KERN_UNIMPLEMENTED;
-}
-
-#define SYSCALL_TABLE_ENTRY(id, p) [SYS_##id] = (virt_addr_t)(sys_##p)
-
-static const virt_addr_t syscall_table[] = {
-	SYSCALL_TABLE_ENTRY(EXIT, exit),
-	SYSCALL_TABLE_ENTRY(VM_OBJECT_CREATE, vm_object_create),
-};
-static const size_t syscall_table_count
-	= sizeof syscall_table / sizeof syscall_table[0];
-
-virt_addr_t syscall_get_func(unsigned int sysid)
-{
-	if (sysid >= syscall_table_count) {
-		return 0;
-	}
-
-	return syscall_table[sysid];
-}