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Diffstat (limited to 'include/asm-blackfin/system.h')
| -rw-r--r-- | include/asm-blackfin/system.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h new file mode 100644 index 0000000000..0e53adfe0f --- /dev/null +++ b/include/asm-blackfin/system.h @@ -0,0 +1,182 @@ +/* + * 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 */ |