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/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_MICROBLAZE_PROCESSOR_H
#define _ASM_MICROBLAZE_PROCESSOR_H
#include <asm/ptrace.h>
#include <asm/setup.h>
#include <asm/registers.h>
#include <asm/entry.h>
#include <asm/current.h>
# ifndef __ASSEMBLY__
/* from kernel/cpu/mb.c */
extern const struct seq_operations cpuinfo_op;
# define cpu_relax() barrier()
# define cpu_sleep() do {} while (0)
# define prepare_to_copy(tsk) do {} while (0)
#define task_pt_regs(tsk) \
(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
/* Do necessary setup to start up a newly executed thread. */
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
# endif /* __ASSEMBLY__ */
# ifndef CONFIG_MMU
/*
* User space process size: memory size
*
* TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
* user processes and the kernel is on the same memory region. They
* both share the memory space and that is limited by the amount of
* physical memory. thus, we set TASK_SIZE == amount of total memory.
*/
# define TASK_SIZE (0x81000000 - 0x80000000)
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
# define current_text_addr() ({ __label__ _l; _l: &&_l; })
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's. We won't be using it
*/
# define TASK_UNMAPPED_BASE 0
/* definition in include/linux/sched.h */
struct task_struct;
/* thread_struct is gone. use thread_info instead. */
struct thread_struct { };
# define INIT_THREAD { }
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
/* Free all resources held by a thread. */
static inline void exit_thread(void)
{
}
extern unsigned long thread_saved_pc(struct task_struct *t);
extern unsigned long get_wchan(struct task_struct *p);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
# define KSTK_EIP(tsk) (0)
# define KSTK_ESP(tsk) (0)
# else /* CONFIG_MMU */
/*
* This is used to define STACK_TOP, and with MMU it must be below
* kernel base to select the correct PGD when handling MMU exceptions.
*/
# define TASK_SIZE (CONFIG_KERNEL_START)
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
# define THREAD_KSP 0
# ifndef __ASSEMBLY__
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
# define current_text_addr() ({ __label__ _l; _l: &&_l; })
/* If you change this, you must change the associated assembly-languages
* constants defined below, THREAD_*.
*/
struct thread_struct {
/* kernel stack pointer (must be first field in structure) */
unsigned long ksp;
unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
void *pgdir; /* root of page-table tree */
struct pt_regs *regs; /* Pointer to saved register state */
};
# define INIT_THREAD { \
.ksp = sizeof init_stack + (unsigned long)init_stack, \
.pgdir = swapper_pg_dir, \
}
/* Free all resources held by a thread. */
extern inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Free current thread data structures etc. */
static inline void exit_thread(void)
{
}
/* Return saved (kernel) PC of a blocked thread. */
# define thread_saved_pc(tsk) \
((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
unsigned long get_wchan(struct task_struct *p);
/* The size allocated for kernel stacks. This _must_ be a power of two! */
# define KERNEL_STACK_SIZE 0x2000
/* Return some info about the user process TASK. */
# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
# define task_pt_regs_plus_args(tsk) \
((void *)task_pt_regs(tsk))
# define task_sp(task) (task_regs(task)->r1)
# define task_pc(task) (task_regs(task)->pc)
/* Grotty old names for some. */
# define KSTK_EIP(task) (task_pc(task))
# define KSTK_ESP(task) (task_sp(task))
/* FIXME */
# define deactivate_mm(tsk, mm) do { } while (0)
# define STACK_TOP TASK_SIZE
# define STACK_TOP_MAX STACK_TOP
# endif /* __ASSEMBLY__ */
# endif /* CONFIG_MMU */
#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
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