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Diffstat (limited to 'arch/m68k/include/asm/processor_mm.h')
-rw-r--r--arch/m68k/include/asm/processor_mm.h130
1 files changed, 130 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/processor_mm.h b/arch/m68k/include/asm/processor_mm.h
new file mode 100644
index 00000000000..1f61ef53f0e
--- /dev/null
+++ b/arch/m68k/include/asm/processor_mm.h
@@ -0,0 +1,130 @@
+/*
+ * 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)
+{
+ unsigned long usp;
+
+ __asm__ __volatile__("move %/usp,%0" : "=a" (usp));
+ return usp;
+}
+
+static inline void wrusp(unsigned long usp)
+{
+ __asm__ __volatile__("move %0,%/usp" : : "a" (usp));
+}
+
+/*
+ * 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.
+ */
+#ifndef CONFIG_SUN3
+#define TASK_UNMAPPED_BASE 0xC0000000UL
+#else
+#define TASK_UNMAPPED_BASE 0x0A000000UL
+#endif
+#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
+
+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), \
+}
+
+/*
+ * 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);
+}
+
+/* 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