2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/sched.h"
7 #include "linux/slab.h"
8 #include "linux/ptrace.h"
9 #include "linux/proc_fs.h"
10 #include "linux/file.h"
11 #include "linux/errno.h"
12 #include "linux/init.h"
13 #include "asm/uaccess.h"
14 #include "asm/atomic.h"
15 #include "kern_util.h"
18 #include "user_util.h"
22 #include "registers.h"
24 void switch_to_skas(void *prev, void *next)
26 struct task_struct *from, *to;
31 /* XXX need to check runqueues[cpu].idle */
35 switch_threads(&from->thread.mode.skas.switch_buf,
36 to->thread.mode.skas.switch_buf);
42 extern void schedule_tail(struct task_struct *prev);
44 void new_thread_handler(int sig)
49 fn = current->thread.request.u.thread.proc;
50 arg = current->thread.request.u.thread.arg;
52 thread_wait(¤t->thread.mode.skas.switch_buf,
53 current->thread.mode.skas.fork_buf);
55 if(current->thread.prev_sched != NULL)
56 schedule_tail(current->thread.prev_sched);
57 current->thread.prev_sched = NULL;
59 /* The return value is 1 if the kernel thread execs a process,
62 n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf);
64 /* Handle any immediate reschedules or signals */
66 userspace(¤t->thread.regs.regs);
71 void new_thread_proc(void *stack, void (*handler)(int sig))
73 init_new_thread_stack(stack, handler);
74 os_usr1_process(os_getpid());
77 void release_thread_skas(struct task_struct *task)
81 void fork_handler(int sig)
84 thread_wait(¤t->thread.mode.skas.switch_buf,
85 current->thread.mode.skas.fork_buf);
88 if(current->thread.prev_sched == NULL)
91 schedule_tail(current->thread.prev_sched);
92 current->thread.prev_sched = NULL;
94 /* Handle any immediate reschedules or signals */
96 userspace(¤t->thread.regs.regs);
99 int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
100 unsigned long stack_top, struct task_struct * p,
101 struct pt_regs *regs)
103 void (*handler)(int);
105 if(current->thread.forking){
106 memcpy(&p->thread.regs.regs.skas, ®s->regs.skas,
107 sizeof(p->thread.regs.regs.skas));
108 REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
109 if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
111 handler = fork_handler;
114 init_thread_registers(&p->thread.regs.regs);
115 p->thread.request.u.thread = current->thread.request.u.thread;
116 handler = new_thread_handler;
119 new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf,
120 &p->thread.mode.skas.fork_buf, handler);
124 int new_mm(unsigned long stack)
128 fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
133 map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
138 void init_idle_skas(void)
140 cpu_tasks[current_thread->cpu].pid = os_getpid();
144 extern void start_kernel(void);
146 static int start_kernel_proc(void *unused)
153 cpu_tasks[0].pid = pid;
154 cpu_tasks[0].task = current;
156 cpu_online_map = cpumask_of_cpu(0);
162 extern int userspace_pid[];
164 int start_uml_skas(void)
167 userspace_pid[0] = start_userspace(0);
169 init_new_thread_signals(1);
171 init_task.thread.request.u.thread.proc = start_kernel_proc;
172 init_task.thread.request.u.thread.arg = NULL;
173 return(start_idle_thread(task_stack_page(&init_task),
174 &init_task.thread.mode.skas.switch_buf,
175 &init_task.thread.mode.skas.fork_buf));
178 int external_pid_skas(struct task_struct *task)
180 #warning Need to look up userspace_pid by cpu
181 return(userspace_pid[0]);
184 int thread_pid_skas(struct task_struct *task)
186 #warning Need to look up userspace_pid by cpu
187 return(userspace_pid[0]);
190 void kill_off_processes_skas(void)
193 #warning need to loop over userspace_pids in kill_off_processes_skas
194 os_kill_ptraced_process(userspace_pid[0], 1);
196 struct task_struct *p;
204 pid = p->mm->context.skas.id.u.pid;
205 os_kill_ptraced_process(pid, 1);
210 unsigned long current_stub_stack(void)
212 if(current->mm == NULL)
215 return(current->mm->context.skas.id.stack);