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/*
* U-boot - system.h
*
* Copyright (c) 2005 blackfin.uclinux.org
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _BLACKFIN_SYSTEM_H
#define _BLACKFIN_SYSTEM_H
#include <linux/config.h> /* get configuration macros */
#include <asm/linkage.h>
#include <asm/blackfin.h>
#include <asm/segment.h>
#include <asm/entry.h>
#define prepare_to_switch() do { } while(0)
/*
* 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.
*
* 05/25/01 - Tony Kou (tonyko@lineo.ca)
*
* Adapted for BlackFin (ADI) by Ted Ma, Metrowerks, and Motorola GSG
* Copyright (c) 2002 Arcturus Networks Inc. (www.arcturusnetworks.com)
* Copyright (c) 2003 Metrowerks (www.metrowerks.com)
*/
asmlinkage void resume(void);
#define switch_to(prev,next,last) { \
void *_last; \
__asm__ __volatile__( \
"r0 = %1;\n\t" \
"r1 = %2;\n\t" \
"call resume;\n\t" \
"%0 = r0;\n\t" \
: "=d" (_last) \
: "d" (prev), \
"d" (next) \
: "CC", "R0", "R1", "R2", "R3", "R4", "R5", "P0", "P1");\
(last) = _last; \
}
/* Force kerenl switch to user mode -- Steven Chen */
#define switch_to_user_mode() { \
__asm__ __volatile__( \
"call kernel_to_user_mode;\n\t" \
:: \
: "CC", "R0", "R1", "R2", "R3", "R4", "R5", "P0", "P1");\
}
/*
* Interrupt configuring macros.
*/
extern int irq_flags;
#define __sti() { \
__asm__ __volatile__ ( \
"r3 = %0;" \
"sti r3;" \
::"m"(irq_flags):"R3"); \
}
#define __cli() { \
__asm__ __volatile__ ( \
"cli r3;" \
:::"R3"); \
}
#define __save_flags(x) { \
__asm__ __volatile__ ( \
"cli r3;" \
"%0 = r3;" \
"sti r3;" \
::"m"(x):"R3"); \
}
#define __save_and_cli(x) { \
__asm__ __volatile__ ( \
"cli r3;" \
"%0 = r3;" \
::"m"(x):"R3"); \
}
#define __restore_flags(x) { \
__asm__ __volatile__ ( \
"r3 = %0;" \
"sti r3;" \
::"m"(x):"R3"); \
}
/* For spinlocks etc */
#define local_irq_save(x) __save_and_cli(x)
#define local_irq_restore(x) __restore_flags(x)
#define local_irq_disable() __cli()
#define local_irq_enable() __sti()
#define cli() __cli()
#define sti() __sti()
#define save_flags(x) __save_flags(x)
#define restore_flags(x) __restore_flags(x)
#define save_and_cli(x) __save_and_cli(x)
/*
* Force strict CPU ordering.
*/
#define nop() asm volatile ("nop;\n\t"::)
#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()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#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))
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
int size)
{
unsigned long tmp;
unsigned long flags = 0;
save_and_cli(flags);
switch (size) {
case 1:
__asm__ __volatile__("%0 = %2;\n\t" "%2 = %1;\n\t": "=&d"(tmp): "d"(x), "m"(*__xg(ptr)):"memory");
break;
case 2:
__asm__ __volatile__("%0 = %2;\n\t" "%2 = %1;\n\t": "=&d"(tmp): "d"(x), "m"(*__xg(ptr)):"memory");
break;
case 4:
__asm__ __volatile__("%0 = %2;\n\t" "%2 = %1;\n\t": "=&d"(tmp): "d"(x), "m"(*__xg(ptr)):"memory");
break;
}
restore_flags(flags);
return tmp;
}
/* Depend on whether Blackfin has hard reset function */
/* YES it does, but it is tricky to implement - FIXME later ...MaTed--- */
#define HARD_RESET_NOW() ({})
#endif /* _BLACKFIN_SYSTEM_H */
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