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Diffstat (limited to 'arch/m68knommu/include/asm/processor.h')
-rw-r--r--arch/m68knommu/include/asm/processor.h143
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/m68knommu/include/asm/processor.h b/arch/m68knommu/include/asm/processor.h
new file mode 100644
index 000000000000..91cba18acdd3
--- /dev/null
+++ b/arch/m68knommu/include/asm/processor.h
@@ -0,0 +1,143 @@
+/*
+ * include/asm-m68knommu/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/compiler.h>
+#include <linux/threads.h>
+#include <asm/types.h>
+#include <asm/segment.h>
+#include <asm/fpu.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+
+static inline unsigned long rdusp(void)
+{
+#ifdef CONFIG_COLDFIRE
+ extern unsigned int sw_usp;
+ return(sw_usp);
+#else
+ 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.
+ */
+#define TASK_SIZE (0xF0000000UL)
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's. We won't be using it
+ */
+#define TASK_UNMAPPED_BASE 0
+
+/*
+ * if you change this structure, you must change the code and offsets
+ * in m68k/machasm.S
+ */
+
+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 fp[8*3];
+ unsigned long fpcntl[3]; /* fp control regs */
+ unsigned char fpstate[FPSTATESIZE]; /* floating point state */
+};
+
+#define INIT_THREAD { \
+ sizeof(init_stack) + (unsigned long) init_stack, 0, \
+ PS_S, __KERNEL_DS, \
+ {0, 0}, 0, {0,}, {0, 0, 0}, {0,}, \
+}
+
+/*
+ * Coldfire stacks need to be re-aligned on trap exit, conventional
+ * 68k can handle this case cleanly.
+ */
+#if defined(CONFIG_COLDFIRE)
+#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
+#else
+#define reformat(_regs) do { } while (0)
+#endif
+
+/*
+ * Do necessary setup to start up a newly executed thread.
+ *
+ * pass the data segment into user programs if it exists,
+ * it can't hurt anything as far as I can tell
+ */
+#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)
+
+/* 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)
+{
+}
+
+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