Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 213 insertions, 0 deletions

diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
new file mode 100644
index 000000000000..5d096ea63b97
--- /dev/null
+++ b/arch/um/kernel/skas/process_kern.c
@@ -0,0 +1,213 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#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"
+#include "skas.h"
+#include "os.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "kern.h"
+#include "mode.h"
+#include "proc_mm.h"
+#include "registers.h"
+
+void *switch_to_skas(void *prev, void *next)
+{
+        struct task_struct *from, *to;
+
+        from = prev;
+        to = next;
+
+        /* XXX need to check runqueues[cpu].idle */
+        if(current->pid == 0)
+                switch_timers(0);
+
+        to->thread.prev_sched = from;
+        set_current(to);
+
+        switch_threads(&from->thread.mode.skas.switch_buf, 
+                       to->thread.mode.skas.switch_buf);
+
+        if(current->pid == 0)
+                switch_timers(1);
+
+        return(current->thread.prev_sched);
+}
+
+extern void schedule_tail(struct task_struct *prev);
+
+void new_thread_handler(int sig)
+{
+        int (*fn)(void *), n;
+        void *arg;
+
+        fn = current->thread.request.u.thread.proc;
+        arg = current->thread.request.u.thread.arg;
+        change_sig(SIGUSR1, 1);
+        thread_wait(&current->thread.mode.skas.switch_buf, 
+                    current->thread.mode.skas.fork_buf);
+
+        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);
+        else do_exit(0);
+}
+
+void new_thread_proc(void *stack, void (*handler)(int sig))
+{
+        init_new_thread_stack(stack, handler);
+        os_usr1_process(os_getpid());
+}
+
+void release_thread_skas(struct task_struct *task)
+{
+}
+
+void exit_thread_skas(void)
+{
+}
+
+void fork_handler(int sig)
+{
+        change_sig(SIGUSR1, 1);
+        thread_wait(&current->thread.mode.skas.switch_buf, 
+                    current->thread.mode.skas.fork_buf);
+        
+        force_flush_all();
+        if(current->thread.prev_sched == NULL)
+                panic("blech");
+
+        schedule_tail(current->thread.prev_sched);
+        current->thread.prev_sched = NULL;
+
+        userspace(&current->thread.regs.regs);
+}
+
+int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
+                     unsigned long stack_top, struct task_struct * p, 
+                     struct pt_regs *regs)
+{
+        void (*handler)(int);
+
+        if(current->thread.forking){
+                memcpy(&p->thread.regs.regs.skas, 
+                       &current->thread.regs.regs.skas, 
+                       sizeof(p->thread.regs.regs.skas));
+                REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
+                if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
+
+                handler = fork_handler;
+        }
+        else {
+                init_thread_registers(&p->thread.regs.regs);
+                p->thread.request.u.thread = current->thread.request.u.thread;
+                handler = new_thread_handler;
+        }
+
+        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->cpu].pid = os_getpid();
+        default_idle();
+}
+
+extern void start_kernel(void);
+
+static int start_kernel_proc(void *unused)
+{
+        int pid;
+
+        block_signals();
+        pid = os_getpid();
+
+        cpu_tasks[0].pid = pid;
+        cpu_tasks[0].task = current;
+#ifdef CONFIG_SMP
+        cpu_online_map = cpumask_of_cpu(0);
+#endif
+        start_kernel();
+        return(0);
+}
+
+int start_uml_skas(void)
+{
+        start_userspace(0);
+
+        init_new_thread_signals(1);
+        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(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)
+{
+#warning Need to look up userspace_pid by cpu
+        return(userspace_pid[0]);
+}
+
+int thread_pid_skas(struct task_struct *task)
+{
+#warning Need to look up userspace_pid by cpu
+        return(userspace_pid[0]);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */