m68k: merge mmu and non-mmu versions of processor.h
[linux-2.6.git] / arch / m68k / include / asm / processor.h
index fc3f2c2..74fd674 100644 (file)
@@ -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