m68k: merge m68k and m68knommu arch directories

There is a lot of common code that could be shared between the m68k
and m68knommu arch branches. It makes sense to merge the two branches
into a single directory structure so that we can more easily share
that common code.

This is a brute force merge, based on a script from Stephen King
<sfking@fdwdc.com>, which was originally written by Arnd Bergmann
<arnd@arndb.de>.

> The script was inspired by the script Sam Ravnborg used to merge the
> includes from m68knommu. For those files common to both arches but
> differing in content, the m68k version of the file is renamed to
> <file>_mm.<ext> and the m68knommu version of the file is moved into the
> corresponding m68k directory and renamed <file>_no.<ext> and a small
> wrapper file <file>.<ext> is used to select between the two version. Files
> that are common to both but don't differ are removed from the m68knommu
> tree and files and directories that are unique to the m68knommu tree are
> moved to the m68k tree. Finally, the arch/m68knommu tree is removed.
>
> To select between the the versions of the files, the wrapper uses
>
> #ifdef CONFIG_MMU
> #include <file>_mm.<ext>
> #else
> #include <file>_no.<ext>
> #endif

On top of this file merge I have done a simplistic merge of m68k and
m68knommu Kconfig, which primarily attempts to keep existing options and
menus in place. Other than a handful of options being moved it produces
identical .config outputs on m68k and m68knommu targets I tested it on.

With this in place there is now quite a bit of scope for merge cleanups
in future patches.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 3 insertions, 352 deletions

diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index c2a1fc23dd75..6cf4bd6e34f8 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -1,354 +1,5 @@
-/*
- *  linux/arch/m68k/kernel/process.c
- *
- *  Copyright (C) 1995  Hamish Macdonald
- *
- *  68060 fixes by Jesper Skov
- */
-
-/*
- * This file handles the architecture-dependent parts of process handling..
- */
-
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/smp.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/reboot.h>
-#include <linux/init_task.h>
-#include <linux/mqueue.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/traps.h>
-#include <asm/machdep.h>
-#include <asm/setup.h>
-#include <asm/pgtable.h>
-
-/*
- * Initial task/thread structure. Make this a per-architecture thing,
- * because different architectures tend to have different
- * alignment requirements and potentially different initial
- * setup.
- */
-static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
-static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
-union thread_union init_thread_union __init_task_data
-	__attribute__((aligned(THREAD_SIZE))) =
-		{ INIT_THREAD_INFO(init_task) };
-
-/* initial task structure */
-struct task_struct init_task = INIT_TASK(init_task);
-
-EXPORT_SYMBOL(init_task);
-
-asmlinkage void ret_from_fork(void);
-
-
-/*
- * Return saved PC from a blocked thread
- */
-unsigned long thread_saved_pc(struct task_struct *tsk)
-{
-	struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
-	/* Check whether the thread is blocked in resume() */
-	if (in_sched_functions(sw->retpc))
-		return ((unsigned long *)sw->a6)[1];
-	else
-		return sw->retpc;
-}
-
-/*
- * The idle loop on an m68k..
- */
-static void default_idle(void)
-{
-	if (!need_resched())
-#if defined(MACH_ATARI_ONLY)
-		/* block out HSYNC on the atari (falcon) */
-		__asm__("stop #0x2200" : : : "cc");
+#ifdef CONFIG_MMU
+#include "process_mm.c"
 #else
-		__asm__("stop #0x2000" : : : "cc");
+#include "process_no.c"
 #endif
-}
-
-void (*idle)(void) = default_idle;
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
-	/* endless idle loop with no priority at all */
-	while (1) {
-		while (!need_resched())
-			idle();
-		preempt_enable_no_resched();
-		schedule();
-		preempt_disable();
-	}
-}
-
-void machine_restart(char * __unused)
-{
-	if (mach_reset)
-		mach_reset();
-	for (;;);
-}
-
-void machine_halt(void)
-{
-	if (mach_halt)
-		mach_halt();
-	for (;;);
-}
-
-void machine_power_off(void)
-{
-	if (mach_power_off)
-		mach_power_off();
-	for (;;);
-}
-
-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
-void show_regs(struct pt_regs * regs)
-{
-	printk("\n");
-	printk("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
-	       regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
-	printk("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
-	       regs->orig_d0, regs->d0, regs->a2, regs->a1);
-	printk("A0: %08lx  D5: %08lx  D4: %08lx\n",
-	       regs->a0, regs->d5, regs->d4);
-	printk("D3: %08lx  D2: %08lx  D1: %08lx\n",
-	       regs->d3, regs->d2, regs->d1);
-	if (!(regs->sr & PS_S))
-		printk("USP: %08lx\n", rdusp());
-}
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-	int pid;
-	mm_segment_t fs;
-
-	fs = get_fs();
-	set_fs (KERNEL_DS);
-
-	{
-	register long retval __asm__ ("d0");
-	register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
-
-	retval = __NR_clone;
-	__asm__ __volatile__
-	  ("clrl %%d2\n\t"
-	   "trap #0\n\t"		/* Linux/m68k system call */
-	   "tstl %0\n\t"		/* child or parent */
-	   "jne 1f\n\t"			/* parent - jump */
-	   "lea %%sp@(%c7),%6\n\t"	/* reload current */
-	   "movel %6@,%6\n\t"
-	   "movel %3,%%sp@-\n\t"	/* push argument */
-	   "jsr %4@\n\t"		/* call fn */
-	   "movel %0,%%d1\n\t"		/* pass exit value */
-	   "movel %2,%%d0\n\t"		/* exit */
-	   "trap #0\n"
-	   "1:"
-	   : "+d" (retval)
-	   : "i" (__NR_clone), "i" (__NR_exit),
-	     "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
-	     "i" (-THREAD_SIZE)
-	   : "d2");
-
-	pid = retval;
-	}
-
-	set_fs (fs);
-	return pid;
-}
-EXPORT_SYMBOL(kernel_thread);
-
-void flush_thread(void)
-{
-	unsigned long zero = 0;
-	set_fs(USER_DS);
-	current->thread.fs = __USER_DS;
-	if (!FPU_IS_EMU)
-		asm volatile (".chip 68k/68881\n\t"
-			      "frestore %0@\n\t"
-			      ".chip 68k" : : "a" (&zero));
-}
-
-/*
- * "m68k_fork()".. By the time we get here, the
- * non-volatile registers have also been saved on the
- * stack. We do some ugly pointer stuff here.. (see
- * also copy_thread)
- */
-
-asmlinkage int m68k_fork(struct pt_regs *regs)
-{
-	return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
-}
-
-asmlinkage int m68k_vfork(struct pt_regs *regs)
-{
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
-		       NULL, NULL);
-}
-
-asmlinkage int m68k_clone(struct pt_regs *regs)
-{
-	unsigned long clone_flags;
-	unsigned long newsp;
-	int __user *parent_tidptr, *child_tidptr;
-
-	/* syscall2 puts clone_flags in d1 and usp in d2 */
-	clone_flags = regs->d1;
-	newsp = regs->d2;
-	parent_tidptr = (int __user *)regs->d3;
-	child_tidptr = (int __user *)regs->d4;
-	if (!newsp)
-		newsp = rdusp();
-	return do_fork(clone_flags, newsp, regs, 0,
-		       parent_tidptr, child_tidptr);
-}
-
-int copy_thread(unsigned long clone_flags, unsigned long usp,
-		 unsigned long unused,
-		 struct task_struct * p, struct pt_regs * regs)
-{
-	struct pt_regs * childregs;
-	struct switch_stack * childstack, *stack;
-	unsigned long *retp;
-
-	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
-
-	*childregs = *regs;
-	childregs->d0 = 0;
-
-	retp = ((unsigned long *) regs);
-	stack = ((struct switch_stack *) retp) - 1;
-
-	childstack = ((struct switch_stack *) childregs) - 1;
-	*childstack = *stack;
-	childstack->retpc = (unsigned long)ret_from_fork;
-
-	p->thread.usp = usp;
-	p->thread.ksp = (unsigned long)childstack;
-
-	if (clone_flags & CLONE_SETTLS)
-		task_thread_info(p)->tp_value = regs->d5;
-
-	/*
-	 * Must save the current SFC/DFC value, NOT the value when
-	 * the parent was last descheduled - RGH  10-08-96
-	 */
-	p->thread.fs = get_fs().seg;
-
-	if (!FPU_IS_EMU) {
-		/* Copy the current fpu state */
-		asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
-
-		if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2])
-		  asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
-				"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
-				: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
-				: "memory");
-		/* Restore the state in case the fpu was busy */
-		asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
-	}
-
-	return 0;
-}
-
-/* Fill in the fpu structure for a core dump.  */
-
-int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
-{
-	char fpustate[216];
-
-	if (FPU_IS_EMU) {
-		int i;
-
-		memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
-		memcpy(fpu->fpregs, current->thread.fp, 96);
-		/* Convert internal fpu reg representation
-		 * into long double format
-		 */
-		for (i = 0; i < 24; i += 3)
-			fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
-			                 ((fpu->fpregs[i] & 0x0000ffff) << 16);
-		return 1;
-	}
-
-	/* First dump the fpu context to avoid protocol violation.  */
-	asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
-	if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
-		return 0;
-
-	asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
-		:: "m" (fpu->fpcntl[0])
-		: "memory");
-	asm volatile ("fmovemx %/fp0-%/fp7,%0"
-		:: "m" (fpu->fpregs[0])
-		: "memory");
-	return 1;
-}
-EXPORT_SYMBOL(dump_fpu);
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *name,
-			  const char __user *const __user *argv,
-			  const char __user *const __user *envp)
-{
-	int error;
-	char * filename;
-	struct pt_regs *regs = (struct pt_regs *) &name;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		return error;
-	error = do_execve(filename, argv, envp, regs);
-	putname(filename);
-	return error;
-}
-
-unsigned long get_wchan(struct task_struct *p)
-{
-	unsigned long fp, pc;
-	unsigned long stack_page;
-	int count = 0;
-	if (!p || p == current || p->state == TASK_RUNNING)
-		return 0;
-
-	stack_page = (unsigned long)task_stack_page(p);
-	fp = ((struct switch_stack *)p->thread.ksp)->a6;
-	do {
-		if (fp < stack_page+sizeof(struct thread_info) ||
-		    fp >= 8184+stack_page)
-			return 0;
-		pc = ((unsigned long *)fp)[1];
-		if (!in_sched_functions(pc))
-			return pc;
-		fp = *(unsigned long *) fp;
-	} while (count++ < 16);
-	return 0;
-}