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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
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