[PATCH] uml: file renaming

Move some foo_kern.c files to foo.c now that the old foo.c files are out
of the way.

Also cleaned up some whitespace and an emacs formatting comment.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/Makefile

@@ -7,7 +7,7 @@ extra-y := vmlinux.lds
 clean-files :=
 
 obj-y = config.o exec.o exitcode.o init_task.o irq.o ksyms.o mem.o \
-	physmem.o process_kern.o ptrace.o reboot.o resource.o sigio.o \
+	physmem.o process.o ptrace.o reboot.o resource.o sigio.o \
 	signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o uaccess.o \
 	um_arch.o umid.o
 

arch/um/kernel/process.c

@@ -1,10 +1,9 @@
-/* 
+/*
  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
  * Copyright 2003 PathScale, Inc.
  * Licensed under the GPL
  */
 
-#include "linux/config.h"
 #include "linux/kernel.h"
 #include "linux/sched.h"
 #include "linux/interrupt.h"
@@ -113,11 +112,11 @@ void set_current(void *t)
 
 void *_switch_to(void *prev, void *next, void *last)
 {
-        struct task_struct *from = prev;
-        struct task_struct *to= next;
+	struct task_struct *from = prev;
+	struct task_struct *to= next;
 
-        to->thread.prev_sched = from;
-        set_current(to);
+	to->thread.prev_sched = from;
+	set_current(to);
 
 	do {
 		current->thread.saved_task = NULL ;
@@ -128,7 +127,7 @@ void *_switch_to(void *prev, void *next, void *last)
 		prev= current;
 	} while(current->thread.saved_task);
 
-        return(current->thread.prev_sched);
+	return(current->thread.prev_sched);
 
 }
 
@@ -142,19 +141,19 @@ void release_thread(struct task_struct *task)
 {
 	CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
 }
- 
+
 void exit_thread(void)
 {
 	unprotect_stack((unsigned long) current_thread);
 }
- 
+
 void *get_current(void)
 {
 	return(current);
 }
 
 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
-		unsigned long stack_top, struct task_struct * p, 
+		unsigned long stack_top, struct task_struct * p,
 		struct pt_regs *regs)
 {
 	int ret;
@@ -183,11 +182,11 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
 	int save_kmalloc_ok = kmalloc_ok;
 
 	kmalloc_ok = 0;
-	CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc, 
+	CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
 			 arg);
 	kmalloc_ok = save_kmalloc_ok;
 }
- 
+
 unsigned long stack_sp(unsigned long page)
 {
 	return(page + PAGE_SIZE - sizeof(void *));
@@ -211,7 +210,7 @@ void default_idle(void)
 		 */
 		if(need_resched())
 			schedule();
-		
+
 		idle_sleep(10);
 	}
 }
@@ -226,7 +225,7 @@ int page_size(void)
 	return(PAGE_SIZE);
 }
 
-void *um_virt_to_phys(struct task_struct *task, unsigned long addr, 
+void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
 		      pte_t *pte_out)
 {
 	pgd_t *pgd;
@@ -235,7 +234,7 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
 	pte_t *pte;
 	pte_t ptent;
 
-	if(task->mm == NULL) 
+	if(task->mm == NULL)
 		return(ERR_PTR(-EINVAL));
 	pgd = pgd_offset(task->mm, addr);
 	if(!pgd_present(*pgd))
@@ -246,7 +245,7 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
 		return(ERR_PTR(-EINVAL));
 
 	pmd = pmd_offset(pud, addr);
-	if(!pmd_present(*pmd)) 
+	if(!pmd_present(*pmd))
 		return(ERR_PTR(-EINVAL));
 
 	pte = pte_offset_kernel(pmd, addr);
@@ -271,7 +270,7 @@ char *current_cmd(void)
 
 void force_sigbus(void)
 {
-	printk(KERN_ERR "Killing pid %d because of a lack of memory\n", 
+	printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
 	       current->pid);
 	lock_kernel();
 	sigaddset(&current->pending.signal, SIGBUS);

arch/um/kernel/skas/Makefile

@@ -3,8 +3,7 @@
 # Licensed under the GPL
 #
 
-obj-y := clone.o exec_kern.o mem.o mmu.o process_kern.o \
-	syscall.o tlb.o uaccess.o
+obj-y := clone.o exec.o mem.o mmu.o process.o syscall.o tlb.o uaccess.o
 
 # clone.o is in the stub, so it can't be built with profiling
 # GCC hardened also auto-enables -fpic, but we need %ebx so it can't work ->

arch/um/kernel/skas/exec.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "asm/current.h"
+#include "asm/page.h"
+#include "asm/signal.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/mmu_context.h"
+#include "tlb.h"
+#include "skas.h"
+#include "um_mmu.h"
+#include "os.h"
+
+void flush_thread_skas(void)
+{
+	force_flush_all();
+	switch_mm_skas(&current->mm->context.skas.id);
+}
+
+void start_thread_skas(struct pt_regs *regs, unsigned long eip,
+		       unsigned long esp)
+{
+	set_fs(USER_DS);
+	PT_REGS_IP(regs) = eip;
+	PT_REGS_SP(regs) = esp;
+}

arch/um/kernel/skas/exec_kern.c

@@ -1,41 +0,0 @@
-/* 
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include "linux/kernel.h"
-#include "asm/current.h"
-#include "asm/page.h"
-#include "asm/signal.h"
-#include "asm/ptrace.h"
-#include "asm/uaccess.h"
-#include "asm/mmu_context.h"
-#include "tlb.h"
-#include "skas.h"
-#include "um_mmu.h"
-#include "os.h"
-
-void flush_thread_skas(void)
-{
-	force_flush_all();
-        switch_mm_skas(&current->mm->context.skas.id);
-}
-
-void start_thread_skas(struct pt_regs *regs, unsigned long eip, 
-		       unsigned long esp)
-{
-	set_fs(USER_DS);
-        PT_REGS_IP(regs) = eip;
-	PT_REGS_SP(regs) = esp;
-}
-
-/*
- * 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:
- */

arch/um/kernel/skas/process.c

@@ -0,0 +1,217 @@
+/*
+ * 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 "skas.h"
+#include "os.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "kern.h"
+#include "mode.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);
+
+	switch_threads(&from->thread.mode.skas.switch_buf,
+		       &to->thread.mode.skas.switch_buf);
+
+	arch_switch_to_skas(current->thread.prev_sched, current);
+
+	if(current->pid == 0)
+		switch_timers(1);
+}
+
+extern void schedule_tail(struct task_struct *prev);
+
+/* This is called magically, by its address being stuffed in a jmp_buf
+ * and being longjmp-d to.
+ */
+void new_thread_handler(void)
+{
+	int (*fn)(void *), n;
+	void *arg;
+
+	if(current->thread.prev_sched != NULL)
+		schedule_tail(current->thread.prev_sched);
+	current->thread.prev_sched = NULL;
+
+	fn = current->thread.request.u.thread.proc;
+	arg = current->thread.request.u.thread.arg;
+
+	/* 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){
+		/* Handle any immediate reschedules or signals */
+		interrupt_end();
+		userspace(&current->thread.regs.regs);
+	}
+	else do_exit(0);
+}
+
+void release_thread_skas(struct task_struct *task)
+{
+}
+
+/* Called magically, see new_thread_handler above */
+void fork_handler(void)
+{
+	force_flush_all();
+	if(current->thread.prev_sched == NULL)
+		panic("blech");
+
+	schedule_tail(current->thread.prev_sched);
+
+	/* XXX: if interrupt_end() calls schedule, this call to
+	 * arch_switch_to_skas isn't needed. We could want to apply this to
+	 * improve performance. -bb */
+	arch_switch_to_skas(current->thread.prev_sched, current);
+
+	current->thread.prev_sched = NULL;
+
+/* Handle any immediate reschedules or signals */
+	interrupt_end();
+
+	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)(void);
+
+	if(current->thread.forking){
+	  	memcpy(&p->thread.regs.regs.skas, &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;
+
+		arch_copy_thread(&current->thread.arch, &p->thread.arch);
+	}
+	else {
+		init_thread_registers(&p->thread.regs.regs);
+		p->thread.request.u.thread = current->thread.request.u.thread;
+		handler = new_thread_handler;
+	}
+
+	new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf,
+		   handler);
+	return(0);
+}
+
+int new_mm(unsigned long stack)
+{
+	int fd;
+
+	fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
+	if(fd < 0)
+		return(fd);
+
+	if(skas_needs_stub)
+		map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
+
+	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);
+}
+
+extern int userspace_pid[];
+
+int start_uml_skas(void)
+{
+	if(proc_mm)
+		userspace_pid[0] = start_userspace(0);
+
+	init_new_thread_signals();
+
+	init_task.thread.request.u.thread.proc = start_kernel_proc;
+	init_task.thread.request.u.thread.arg = NULL;
+	return(start_idle_thread(task_stack_page(&init_task),
+				 &init_task.thread.mode.skas.switch_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]);
+}
+
+void kill_off_processes_skas(void)
+{
+	if(proc_mm)
+#warning need to loop over userspace_pids in kill_off_processes_skas
+		os_kill_ptraced_process(userspace_pid[0], 1);
+	else {
+		struct task_struct *p;
+		int pid, me;
+
+		me = os_getpid();
+		for_each_process(p){
+			if(p->mm == NULL)
+				continue;
+
+			pid = p->mm->context.skas.id.u.pid;
+			os_kill_ptraced_process(pid, 1);
+		}
+	}
+}
+
+unsigned long current_stub_stack(void)
+{
+	if(current->mm == NULL)
+		return(0);
+
+	return(current->mm->context.skas.id.stack);
+}