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/*
* 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/config.h>
#include <asm/segment.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>
extern inline unsigned long rdusp(void) {
unsigned long usp;
__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
return usp;
}
extern 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
#ifdef __ASSEMBLY__
#define TASK_SIZE (0x0E000000)
#else
#define TASK_SIZE (0x0E000000UL)
#endif
#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)
/*
* Bus types
*/
#define EISA_bus 0
#define MCA_bus 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 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 { \
sizeof(init_stack) + (unsigned long) init_stack, 0, \
PS_S, __KERNEL_DS, \
}
/*
* 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)
{
}
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
#define copy_segments(tsk, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}
/*
* Return saved PC of a blocked thread.
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
extern void scheduling_functions_start_here(void);
extern void scheduling_functions_end_here(void);
struct switch_stack *sw = (struct switch_stack *)t->ksp;
/* Check whether the thread is blocked in resume() */
if (sw->retpc > (unsigned long)scheduling_functions_start_here &&
sw->retpc < (unsigned long)scheduling_functions_end_here)
return ((unsigned long *)sw->a6)[1];
else
return sw->retpc;
}
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) \
({ \
unsigned long eip = 0; \
if ((tsk)->thread.esp0 > PAGE_SIZE && \
(VALID_PAGE(virt_to_page((tsk)->thread.esp0)))) \
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
eip; })
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
#define THREAD_SIZE (2*PAGE_SIZE)
/* Allocation and freeing of basic task resources. */
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p) free_pages((unsigned long)(p),1)
#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#define cpu_relax() do { } while (0)
#endif
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