m68k: merge mmu and non-mmu versions of processor.h

The mmu and non-mmu versions of processor.h have a lot of common code.
This is a strait forward merge. start_thread() could be improved, but
that is not quite as strait forward, leaving for a follow on change.

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

1 files changed, 168 insertions, 3 deletions

diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
index fc3f2c2..74fd674 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -1,5 +1,170 @@
-#ifdef __uClinux__
-#include "processor_no.h"
+/*
+ * include/asm-m68k/processor.h
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+#ifndef __ASM_M68K_PROCESSOR_H
+#define __ASM_M68K_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+#include <linux/thread_info.h>
+#include <asm/segment.h>
+#include <asm/fpu.h>
+#include <asm/ptrace.h>
+
+static inline unsigned long rdusp(void)
+{
+#ifdef CONFIG_COLDFIRE
+	extern unsigned int sw_usp;
+	return sw_usp;
 #else
-#include "processor_mm.h"
+	unsigned long usp;
+	__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
+	return usp;
+#endif
+}
+
+static inline void wrusp(unsigned long usp)
+{
+#ifdef CONFIG_COLDFIRE
+	extern unsigned int sw_usp;
+	sw_usp = usp;
+#else
+	__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
+#endif
+}
+
+/*
+ * User space process size: 3.75GB. This is hardcoded into a few places,
+ * so don't change it unless you know what you are doing.
+ */
+#ifndef CONFIG_SUN3
+#define TASK_SIZE	(0xF0000000UL)
+#else
+#define TASK_SIZE	(0x0E000000UL)
+#endif
+
+#ifdef __KERNEL__
+#define STACK_TOP	TASK_SIZE
+#define STACK_TOP_MAX	STACK_TOP
+#endif
+
+/* This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#ifdef CONFIG_MMU
+#ifndef CONFIG_SUN3
+#define TASK_UNMAPPED_BASE	0xC0000000UL
+#else
+#define TASK_UNMAPPED_BASE	0x0A000000UL
+#endif
+#define TASK_UNMAPPED_ALIGN(addr, off)	PAGE_ALIGN(addr)
+#else
+#define TASK_UNMAPPED_BASE	0
+#endif
+
+struct thread_struct {
+	unsigned long  ksp;		/* kernel stack pointer */
+	unsigned long  usp;		/* user stack pointer */
+	unsigned short sr;		/* saved status register */
+	unsigned short fs;		/* saved fs (sfc, dfc) */
+	unsigned long  crp[2];		/* cpu root pointer */
+	unsigned long  esp0;		/* points to SR of stack frame */
+	unsigned long  faddr;		/* info about last fault */
+	int            signo, code;
+	unsigned long  fp[8*3];
+	unsigned long  fpcntl[3];	/* fp control regs */
+	unsigned char  fpstate[FPSTATESIZE];  /* floating point state */
+	struct thread_info info;
+};
+
+#define INIT_THREAD  {							\
+	.ksp	= sizeof(init_stack) + (unsigned long) init_stack,	\
+	.sr	= PS_S,							\
+	.fs	= __KERNEL_DS,						\
+	.info	= INIT_THREAD_INFO(init_task),				\
+}
+
+#ifdef CONFIG_MMU
+/*
+ * Do necessary setup to start up a newly executed thread.
+ */
+static inline void start_thread(struct pt_regs * regs, unsigned long pc,
+				unsigned long usp)
+{
+	/* reads from user space */
+	set_fs(USER_DS);
+
+	regs->pc = pc;
+	regs->sr &= ~0x2000;
+	wrusp(usp);
+}
+
+#else
+
+/*
+ * Coldfire stacks need to be re-aligned on trap exit, conventional
+ * 68k can handle this case cleanly.
+ */
+#ifdef CONFIG_COLDFIRE
+#define reformat(_regs)		do { (_regs)->format = 0x4; } while(0)
+#else
+#define reformat(_regs)		do { } while (0)
+#endif
+
+#define start_thread(_regs, _pc, _usp)                  \
+do {                                                    \
+	set_fs(USER_DS); /* reads from user space */    \
+	(_regs)->pc = (_pc);                            \
+	((struct switch_stack *)(_regs))[-1].a6 = 0;    \
+	reformat(_regs);                                \
+	if (current->mm)                                \
+		(_regs)->d5 = current->mm->start_data;  \
+	(_regs)->sr &= ~0x2000;                         \
+	wrusp(_usp);                                    \
+} while(0)
+
+#endif
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+
+/* Free all resources held by a thread. */
+static inline void release_thread(struct task_struct *dead_task)
+{
+}
+
+/* Prepare to copy thread state - unlazy all lazy status */
+#define prepare_to_copy(tsk)	do { } while (0)
+
+extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
+
+/*
+ * Free current thread data structures etc..
+ */
+static inline void exit_thread(void)
+{
+}
+
+extern unsigned long thread_saved_pc(struct task_struct *tsk);
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define	KSTK_EIP(tsk)	\
+    ({			\
+	unsigned long eip = 0;	 \
+	if ((tsk)->thread.esp0 > PAGE_SIZE && \
+	    (virt_addr_valid((tsk)->thread.esp0))) \
+	      eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
+	eip; })
+#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
+
+#define cpu_relax()	barrier()
+
 #endif