diff options
Diffstat (limited to 'include/asm-m68k/system.h')
| -rw-r--r-- | include/asm-m68k/system.h | 160 |
1 files changed, 130 insertions, 30 deletions
diff --git a/include/asm-m68k/system.h b/include/asm-m68k/system.h index e987f1f46..859c748e3 100644 --- a/include/asm-m68k/system.h +++ b/include/asm-m68k/system.h @@ -1,53 +1,153 @@ +#ifndef _M68K_SYSTEM_H +#define _M68K_SYSTEM_H + +#include <linux/config.h> /* get configuration macros */ +#include <linux/linkage.h> +#include <asm/segment.h> + +extern inline unsigned long rdusp(void) { + unsigned long usp; + + __asm__ __volatile__("movec %/usp,%0" + : "=d" (usp)); + return usp; +} + +extern inline void wrusp(unsigned long usp) { + __asm__ __volatile__("movec %0,%/usp" + : + : "d" (usp)); +} + /* - * linux/include/asm-m68k/system.h - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file README.legal in the main directory of this archive - * for more details. + * switch_to(n) should switch tasks to task ptr, first checking that + * ptr isn't the current task, in which case it does nothing. This + * also clears the TS-flag if the task we switched to has used the + * math co-processor latest. */ - /* - * 680x0 support added by Hamish Macdonald + * switch_to() saves the extra registers, that are not saved + * automatically by SAVE_SWITCH_STACK in resume(), ie. d0-d5 and + * a0-a1. Some of these are used by schedule() and its predecessors + * and so we might get see unexpected behaviors when a task returns + * with unexpected register values. + * + * syscall stores these registers itself and none of them are used + * by syscall after the function in the syscall has been called. + * + * Beware that resume now expects *next to be in d1 and the offset of + * tss to be in a1. This saves a few instructions as we no longer have + * to push them onto the stack and read them back right after. + * + * 02/17/96 - Jes Sorensen (jds@kom.auc.dk) + * + * Changed 96/09/19 by Andreas Schwab + * pass prev in a0, next in a1, offset of tss in d1, and whether + * the mm structures are shared in d2 (to avoid atc flushing). */ +asmlinkage void resume(void); +#define switch_to(prev,next) { \ + register void *_prev __asm__ ("a0") = (prev); \ + register void *_next __asm__ ("a1") = (next); \ + register int _tssoff __asm__ ("d1") = (int)&((struct task_struct *)0)->tss; \ + register char _shared __asm__ ("d2") = ((prev)->mm == (next)->mm); \ + __asm__ __volatile__("jbsr " SYMBOL_NAME_STR(resume) "\n\t" \ + : : "a" (_prev), "a" (_next), "d" (_tssoff), \ + "d" (_shared) \ + : "d0", "d1", "d2", "d3", "d4", "d5", "a0", "a1"); \ +} -#ifndef _M68K_SYSTEM_H -#define _M68K_SYSTEM_H +#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) +#define tas(ptr) (xchg((ptr),1)) -#include <linux/config.h> /* get configuration macros */ +struct __xchg_dummy { unsigned long a[100]; }; +#define __xg(x) ((volatile struct __xchg_dummy *)(x)) #if defined(CONFIG_ATARI) && !defined(CONFIG_AMIGA) && !defined(CONFIG_MAC) /* block out HSYNC on the atari */ -#define sti() __asm__ __volatile__ ("andiw #0xfbff,sr": : : "memory") +#define sti() __asm__ __volatile__ ("andiw #0xfbff,%/sr": : : "memory") #else /* portable version */ -#define sti() __asm__ __volatile__ ("andiw #0xf8ff,sr": : : "memory") +#define sti() __asm__ __volatile__ ("andiw #0xf8ff,%/sr": : : "memory") #endif /* machine compilation types */ -#define cli() __asm__ __volatile__ ("oriw #0x0700,sr": : : "memory") +#define cli() __asm__ __volatile__ ("oriw #0x0700,%/sr": : : "memory") #define nop() __asm__ __volatile__ ("nop"::) +#define mb() __asm__ __volatile__ ("" : : :"memory") #define save_flags(x) \ -__asm__ __volatile__("movew sr,%0":"=d" (x) : /* no input */ :"memory") +__asm__ __volatile__("movew %/sr,%0":"=d" (x) : /* no input */ :"memory") #define restore_flags(x) \ -__asm__ __volatile__("movew %0,sr": /* no outputs */ :"d" (x) : "memory") +__asm__ __volatile__("movew %0,%/sr": /* no outputs */ :"d" (x) : "memory") #define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc") -#define move_to_user_mode() \ - __asm__ __volatile__ ("movel sp,usp\n\t" /* setup user sp */ \ - "movec %0,msp\n\t" /* setup kernel sp */ \ - "andiw #0xdfff,sr" /* return to user mode */ \ - : /* no output */ \ - : "r" (current->kernel_stack_page + PAGE_SIZE) \ - : "memory", "sp") - -static inline void clear_fpu(void) { - unsigned long nilstate = 0; - __asm__ __volatile__ ("frestore %0@" : : "a" (&nilstate)); +#ifndef CONFIG_RMW_INSNS +static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) +{ + unsigned long tmp, flags; + + save_flags(flags); + cli(); + + switch (size) { + case 1: + __asm__ __volatile__ + ("moveb %2,%0\n\t" + "moveb %1,%2" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 2: + __asm__ __volatile__ + ("movew %2,%0\n\t" + "movew %1,%2" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 4: + __asm__ __volatile__ + ("movel %2,%0\n\t" + "movel %1,%2" + : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + } + restore_flags(flags); + return tmp; } +#else +static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) +{ + switch (size) { + case 1: + __asm__ __volatile__ + ("moveb %2,%0\n\t" + "1:\n\t" + "casb %0,%1,%2\n\t" + "jne 1b" + : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 2: + __asm__ __volatile__ + ("movew %2,%0\n\t" + "1:\n\t" + "casw %0,%1,%2\n\t" + "jne 1b" + : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + case 4: + __asm__ __volatile__ + ("movel %2,%0\n\t" + "1:\n\t" + "casl %0,%1,%2\n\t" + "jne 1b" + : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); + break; + } + return x; +} +#endif -#define halt() \ - __asm__ __volatile__ ("halt") +/* + * Reset the machine. + */ +extern void hard_reset_now(void); #endif /* _M68K_SYSTEM_H */ |