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-rw-r--r--include/asm-blackfin/processor.h174
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diff --git a/include/asm-blackfin/processor.h b/include/asm-blackfin/processor.h
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+/*
+ * U-boot - processor.h
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * This file is based on
+ * include/asm-m68k/processor.h
+ * Changes made by Akbar Hussain Lineo, Inc, May 2001 for BLACKFIN
+ * Copyright (C) 1995 Hamish Macdonald
+ *
+ * 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 __ASM_BLACKFIN_PROCESSOR_H
+#define __ASM_BLACKFIN_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+#include <linux/config.h>
+#include <asm/segment.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+
+extern inline unsigned long rdusp(void)
+{
+ unsigned long usp;
+
+ __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
+ return usp;
+}
+
+extern inline void wrusp(unsigned long usp)
+{
+ __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
+}
+
+/*
+ * User space process size: 3.75GB. This is hardcoded into a few places,
+ * so don't change it unless you know what you are doing.
+ */
+#define TASK_SIZE (0xF0000000UL)
+
+/*
+ * Bus types
+ */
+#define EISA_bus 0
+#define MCA_bus 0
+
+/* There is no pc register avaliable for BLACKFIN, so we are going to get
+ * it indirectly
+ */
+
+#if 0
+inline unsigned long obtain_pc_indirectly(void)
+{
+ unsigned long pc;
+ __asm__ __volatile__("%0 = rets;\n":"=d"(pc));
+ return (pc - 4); /* call pcrel24 is 4 bytes long */
+}
+#endif
+
+/*
+ * if you change this structure, you must change the code and offsets
+ * in m68k/machasm.S
+ */
+
+struct thread_struct {
+ unsigned long ksp; /* kernel stack pointer */
+ unsigned long usp; /* user stack pointer */
+ unsigned short seqstat; /* saved status register */
+ unsigned long esp0; /* points to SR of stack frame pt_regs */
+ unsigned long pc; /* instruction pointer */
+};
+
+#define INIT_MMAP { &init_mm, 0, 0x40000000, NULL, __pgprot(_PAGE_PRESENT|_PAGE_ACCESSED), VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
+
+#define INIT_THREAD { \
+ sizeof(init_stack) + (unsigned long) init_stack, 0, \
+ PS_S, 0\
+}
+
+/*
+ * Do necessary setup to start up a newly executed thread.
+ *
+ * pass the data segment into user programs if it exists,
+ * it can't hurt anything as far as I can tell
+ */
+#define start_thread(_regs, _pc, _usp) \
+do { \
+ set_fs(USER_DS); /* reads from user space */ \
+ (_regs)->pc = (_pc); \
+ if (current->mm) \
+ (_regs)->r5 = current->mm->start_data; \
+ (_regs)->seqstat &= ~0x0c00; \
+ wrusp(_usp); \
+ /* Adde by HuTao, May 26, 2003 3:39PM */\
+ if ((_regs)->ipend & 0x8000) /* check whether system in supper mode - StChen */\
+ (_regs)->ipend = 0x0;\
+} while(0)
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+
+/* Free all resources held by a thread. */
+static inline void release_thread(struct task_struct *dead_task)
+{
+}
+
+extern int kernel_thread(int (*fn) (void *), void *arg,
+ unsigned long flags);
+
+#define copy_segments(tsk, mm) do { } while (0)
+#define release_segments(mm) do { } while (0)
+#define forget_segments() do { } while (0)
+
+/*
+ * Free current thread data structures etc..
+ */
+static inline void exit_thread(void)
+{
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+extern inline unsigned long thread_saved_pc(struct thread_struct *t)
+{
+ extern void scheduling_functions_start_here(void);
+ extern void scheduling_functions_end_here(void);
+ return 0;
+}
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define KSTK_EIP(tsk) \
+ ({ \
+ unsigned long eip = 0; \
+ if ((tsk)->thread.esp0 > PAGE_SIZE && \
+ MAP_NR((tsk)->thread.esp0) < max_mapnr) \
+ eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
+ eip; })
+#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
+#define THREAD_SIZE (2*PAGE_SIZE)
+
+/* Allocation and freeing of basic task resources. */
+#define alloc_task_struct() \
+ ((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
+#define free_task_struct(p) free_pages((unsigned long)(p),1)
+#define get_task_struct(tsk) atomic_inc(&mem_map[MAP_NR(tsk)].count)
+
+#define init_task (init_task_union.task)
+#define init_stack (init_task_union.stack)
+
+#endif