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-rw-r--r--include/asm-blackfin/system.h182
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diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h
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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 */