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#ifndef _M68KNOMMU_SYSTEM_H
#define _M68KNOMMU_SYSTEM_H
#include <linux/config.h> /* get configuration macros */
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/entry.h>
/*
* 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.
*/
/*
* 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,last) \
{ \
void *_last; \
__asm__ __volatile__( \
"movel %1, %%a0\n\t" \
"movel %2, %%a1\n\t" \
"jbsr resume\n\t" \
"movel %%d1, %0\n\t" \
: "=d" (_last) \
: "d" (prev), "d" (next) \
: "cc", "d0", "d1", "d2", "d3", "d4", "d5", "a0", "a1"); \
(last) = _last; \
}
#ifdef CONFIG_COLDFIRE
#define local_irq_enable() __asm__ __volatile__ ( \
"move %/sr,%%d0\n\t" \
"andi.l #0xf8ff,%%d0\n\t" \
"move %%d0,%/sr\n" \
: /* no outputs */ \
: \
: "cc", "%d0", "memory")
#define local_irq_disable() __asm__ __volatile__ ( \
"move %/sr,%%d0\n\t" \
"ori.l #0x0700,%%d0\n\t" \
"move %%d0,%/sr\n" \
: /* no inputs */ \
: \
: "cc", "%d0", "memory")
#else
/* portable version */ /* FIXME - see entry.h*/
#define ALLOWINT 0xf8ff
#define local_irq_enable() asm volatile ("andiw %0,%%sr": : "i" (ALLOWINT) : "memory")
#define local_irq_disable() asm volatile ("oriw #0x0700,%%sr": : : "memory")
#endif
#define local_save_flags(x) asm volatile ("movew %%sr,%0":"=d" (x) : : "memory")
#define local_irq_restore(x) asm volatile ("movew %0,%%sr": :"d" (x) : "memory")
/* For spinlocks etc */
#define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } while (0)
#define irqs_disabled() \
({ \
unsigned long flags; \
local_save_flags(flags); \
((flags & 0x0700) == 0x0700); \
})
#define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc")
/*
* Force strict CPU ordering.
* Not really required on m68k...
*/
#define nop() asm volatile ("nop"::)
#define mb() asm volatile ("" : : :"memory")
#define rmb() asm volatile ("" : : :"memory")
#define wmb() asm volatile ("" : : :"memory")
#define set_rmb(var, value) do { xchg(&var, value); } while (0)
#define set_mb(var, value) set_rmb(var, value)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() do { } while(0)
#endif
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
#define tas(ptr) (xchg((ptr),1))
struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((volatile struct __xchg_dummy *)(x))
#ifndef CONFIG_RMW_INSNS
static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
{
unsigned long tmp, flags;
local_irq_save(flags);
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;
}
local_irq_restore(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
/*
* Atomic compare and exchange. Compare OLD with MEM, if identical,
* store NEW in MEM. Return the initial value in MEM. Success is
* indicated by comparing RETURN with OLD.
*/
#define __HAVE_ARCH_CMPXCHG 1
static __inline__ unsigned long
cmpxchg(volatile int *p, int old, int new)
{
unsigned long flags;
int prev;
local_irq_save(flags);
if ((prev = *p) == old)
*p = new;
local_irq_restore(flags);
return(prev);
}
#ifdef CONFIG_M68332
#define HARD_RESET_NOW() ({ \
local_irq_disable(); \
asm(" \
movew #0x0000, 0xfffa6a; \
reset; \
/*movew #0x1557, 0xfffa44;*/ \
/*movew #0x0155, 0xfffa46;*/ \
moveal #0, %a0; \
movec %a0, %vbr; \
moveal 0, %sp; \
moveal 4, %a0; \
jmp (%a0); \
"); \
})
#endif
#if defined( CONFIG_M68328 ) || defined( CONFIG_M68EZ328 ) || \
defined (CONFIG_M68360) || defined( CONFIG_M68VZ328 )
#define HARD_RESET_NOW() ({ \
local_irq_disable(); \
asm(" \
moveal #0x10c00000, %a0; \
moveb #0, 0xFFFFF300; \
moveal 0(%a0), %sp; \
moveal 4(%a0), %a0; \
jmp (%a0); \
"); \
})
#endif
#ifdef CONFIG_COLDFIRE
#if defined(CONFIG_M5272) && defined(CONFIG_NETtel)
/*
* Need to account for broken early mask of 5272 silicon. So don't
* jump through the original start address. Jump strait into the
* known start of the FLASH code.
*/
#define HARD_RESET_NOW() ({ \
asm(" \
movew #0x2700, %sr; \
jmp 0xf0000400; \
"); \
})
#elif defined(CONFIG_NETtel) || defined(CONFIG_eLIA) || defined(CONFIG_DISKtel) || defined(CONFIG_SECUREEDGEMP3) || defined(CONFIG_CLEOPATRA)
#define HARD_RESET_NOW() ({ \
asm(" \
movew #0x2700, %sr; \
moveal #0x10000044, %a0; \
movel #0xffffffff, (%a0); \
moveal #0x10000001, %a0; \
moveb #0x00, (%a0); \
moveal #0xf0000004, %a0; \
moveal (%a0), %a0; \
jmp (%a0); \
"); \
})
#elif defined(CONFIG_M528x)
/*
* The MCF528x has a bit (SOFTRST) in memory (Reset Control Register RCR),
* that when set, resets the MCF528x.
*/
#define HARD_RESET_NOW() \
({ \
unsigned char volatile *reset; \
asm("move.w #0x2700, %sr"); \
reset = ((volatile unsigned short *)(MCF_IPSBAR + 0x110000)); \
while(1) \
*reset |= (0x01 << 7);\
})
#else
#define HARD_RESET_NOW() ({ \
asm(" \
movew #0x2700, %sr; \
moveal #0x4, %a0; \
moveal (%a0), %a0; \
jmp (%a0); \
"); \
})
#endif
#endif
#define arch_align_stack(x) (x)
#endif /* _M68KNOMMU_SYSTEM_H */
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