vserver 1.9.3

[linux-2.6.git] / arch / um / kernel / skas / process_kern.c

diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
index 128146c..5418f08 100644 (file)
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -6,6 +6,12 @@
 #include "linux/sched.h"
 #include "linux/slab.h"
 #include "linux/ptrace.h"
+#include "linux/proc_fs.h"
+#include "linux/file.h"
+#include "linux/errno.h"
+#include "linux/init.h"
+#include "asm/uaccess.h"
+#include "asm/atomic.h"
 #include "kern_util.h"
 #include "time_user.h"
 #include "signal_user.h"
@@ -16,6 +22,62 @@
 #include "frame.h"
 #include "kern.h"
 #include "mode.h"
+#include "proc_mm.h"
+
+static atomic_t using_sysemu;
+int sysemu_supported;
+
+void set_using_sysemu(int value)
+{
+       atomic_set(&using_sysemu, sysemu_supported && value);
+}
+
+int get_using_sysemu(void)
+{
+       return atomic_read(&using_sysemu);
+}
+
+int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
+{
+       if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
+               *eof = 1;
+
+       return strlen(buf);
+}
+
+int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
+{
+       char tmp[2];
+
+       if (copy_from_user(tmp, buf, 1))
+               return -EFAULT;
+
+       if (tmp[0] == '0' || tmp[0] == '1')
+               set_using_sysemu(tmp[0] - '0');
+       return count; /*We use the first char, but pretend to write everything*/
+}
+
+int __init make_proc_sysemu(void)
+{
+       struct proc_dir_entry *ent;
+       if (mode_tt || !sysemu_supported)
+               return 0;
+
+       ent = create_proc_entry("sysemu", 0600, &proc_root);
+
+       if (ent == NULL)
+       {
+               printk("Failed to register /proc/sysemu\n");
+               return(0);
+       }
+
+       ent->read_proc  = proc_read_sysemu;
+       ent->write_proc = proc_write_sysemu;
+
+       return 0;
+}
+
+late_initcall(make_proc_sysemu);
 
 int singlestepping_skas(void)
 {
@@ -61,11 +123,13 @@ void new_thread_handler(int sig)
        thread_wait(&current->thread.mode.skas.switch_buf, 
                    current->thread.mode.skas.fork_buf);
 
-#ifdef CONFIG_SMP
-       schedule_tail(NULL);
-#endif
+       if(current->thread.prev_sched != NULL)
+               schedule_tail(current->thread.prev_sched);
        current->thread.prev_sched = NULL;
 
+       /* The return value is 1 if the kernel thread execs a process,
+        * 0 if it just exits
+        */
        n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
        if(n == 1)
                userspace(&current->thread.regs.regs);
@@ -93,11 +157,11 @@ void fork_handler(int sig)
                    current->thread.mode.skas.fork_buf);
        
        force_flush_all();
-#ifdef CONFIG_SMP
+       if(current->thread.prev_sched == NULL)
+               panic("blech");
+
        schedule_tail(current->thread.prev_sched);
-#endif
        current->thread.prev_sched = NULL;
-       unblock_signals();
 
        userspace(&current->thread.regs.regs);
 }
@@ -128,15 +192,36 @@ int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
                handler = new_thread_handler;
        }
 
-       new_thread((void *) p->thread.kernel_stack, 
-                  &p->thread.mode.skas.switch_buf, 
+       new_thread(p->thread_info, &p->thread.mode.skas.switch_buf,
                   &p->thread.mode.skas.fork_buf, handler);
        return(0);
 }
 
+int new_mm(int from)
+{
+       struct proc_mm_op copy;
+       int n, fd;
+
+       fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
+       if(fd < 0)
+               return(fd);
+
+       if(from != -1){
+               copy = ((struct proc_mm_op) { .op       = MM_COPY_SEGMENTS,
+                                             .u        =
+                                             { .copy_segments  = from } } );
+               n = os_write_file(fd, &copy, sizeof(copy));
+               if(n != sizeof(copy))
+                       printk("new_mm : /proc/mm copy_segments failed, "
+                              "err = %d\n", -n);
+       }
+
+       return(fd);
+}
+
 void init_idle_skas(void)
 {
-       cpu_tasks[current->thread_info->cpu].pid = os_getpid();
+       cpu_tasks[current_thread->cpu].pid = os_getpid();
        default_idle();
 }
 
@@ -160,27 +245,29 @@ static int start_kernel_proc(void *unused)
 
 int start_uml_skas(void)
 {
-       start_userspace();
+       start_userspace(0);
        capture_signal_stack();
 
        init_new_thread_signals(1);
-       idle_timer();
+       uml_idle_timer();
 
        init_task.thread.request.u.thread.proc = start_kernel_proc;
        init_task.thread.request.u.thread.arg = NULL;
-       return(start_idle_thread((void *) init_task.thread.kernel_stack,
+       return(start_idle_thread(init_task.thread_info,
                                 &init_task.thread.mode.skas.switch_buf,
                                 &init_task.thread.mode.skas.fork_buf));
 }
 
 int external_pid_skas(struct task_struct *task)
 {
-       return(userspace_pid);
+#warning Need to look up userspace_pid by cpu
+       return(userspace_pid[0]);
 }
 
 int thread_pid_skas(struct task_struct *task)
 {
-       return(userspace_pid);
+#warning Need to look up userspace_pid by cpu
+       return(userspace_pid[0]);
 }
 
 /*