1 files changed, 149 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
new file mode 100644
index 000000000..464e9f5f5
--- /dev/null
+++ b/arch/m68k/include/asm/processor.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * 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_SW_A7
+	extern unsigned int sw_usp;
+	return sw_usp;
+#else
+	register unsigned long usp __asm__("a0");
+	/* move %usp,%a0 */
+	__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
+	return usp;
+#endif
+}
+
+static inline void wrusp(unsigned long usp)
+{
+#ifdef CONFIG_COLDFIRE_SW_A7
+	extern unsigned int sw_usp;
+	sw_usp = usp;
+#else
+	register unsigned long a0 __asm__("a0") = usp;
+	/* move %a0,%usp */
+	__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
+#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.
+ */
+#ifdef CONFIG_MMU
+#if defined(CONFIG_COLDFIRE)
+#define TASK_SIZE	(0xC0000000UL)
+#elif defined(CONFIG_SUN3)
+#define TASK_SIZE	(0x0E000000UL)
+#else
+#define TASK_SIZE	(0xF0000000UL)
+#endif
+#else
+#define TASK_SIZE	(0xFFFFFFFFUL)
+#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
+#if defined(CONFIG_COLDFIRE)
+#define TASK_UNMAPPED_BASE	0x60000000UL
+#elif defined(CONFIG_SUN3)
+#define TASK_UNMAPPED_BASE	0x0A000000UL
+#else
+#define TASK_UNMAPPED_BASE	0xC0000000UL
+#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 */
+};
+
+#define INIT_THREAD  {							\
+	.ksp	= sizeof(init_stack) + (unsigned long) init_stack,	\
+	.sr	= PS_S,							\
+	.fs	= __KERNEL_DS,						\
+}
+
+/*
+ * ColdFire stack format sbould be 0x4 for an aligned usp (will always be
+ * true on thread creation). We need to set this explicitly.
+ */
+#ifdef CONFIG_COLDFIRE
+#define setframeformat(_regs)	do { (_regs)->format = 0x4; } while(0)
+#else
+#define setframeformat(_regs)	do { } while (0)
+#endif
+
+/*
+ * 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)
+{
+	regs->pc = pc;
+	regs->sr &= ~0x2000;
+	setframeformat(regs);
+	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)
+{
+}
+
+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 task_pt_regs(tsk)	((struct pt_regs *) ((tsk)->thread.esp0))
+
+#define cpu_relax()	barrier()
+
+#endif