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/*
* 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_THREAD_INFO_H
#define _ASM_MICROBLAZE_THREAD_INFO_H
#ifdef __KERNEL__
/* we have 8k stack */
#define THREAD_SHIFT 13
#define THREAD_SIZE (1 << THREAD_SHIFT)
#define THREAD_SIZE_ORDER 1
#ifndef __ASSEMBLY__
# include <linux/types.h>
# include <asm/processor.h>
# include <asm/segment.h>
/*
* low level task data that entry.S needs immediate access to
* - this struct should fit entirely inside of one cache line
* - this struct shares the supervisor stack pages
* - if the contents of this structure are changed, the assembly constants
* must also be changed
*/
struct cpu_context {
__u32 r1; /* stack pointer */
__u32 r2;
/* dedicated registers */
__u32 r13;
__u32 r14;
__u32 r15;
__u32 r16;
__u32 r17;
__u32 r18;
/* non-volatile registers */
__u32 r19;
__u32 r20;
__u32 r21;
__u32 r22;
__u32 r23;
__u32 r24;
__u32 r25;
__u32 r26;
__u32 r27;
__u32 r28;
__u32 r29;
__u32 r30;
/* r31 is used as current task pointer */
/* special purpose registers */
__u32 msr;
__u32 ear;
__u32 esr;
__u32 fsr;
};
struct thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
unsigned long flags; /* low level flags */
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
mm_segment_t addr_limit; /* thread address space */
struct restart_block restart_block;
struct cpu_context cpu_context;
};
/*
* macros/functions for gaining access to the thread information structure
*
* preempt_count needs to be 1 initially, until the scheduler is functional.
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.exec_domain = &default_exec_domain, \
.flags = 0, \
.cpu = 0, \
.preempt_count = 1, \
.addr_limit = KERNEL_DS, \
.restart_block = { \
.fn = do_no_restart_syscall, \
}, \
}
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
register unsigned long sp asm("r1");
return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}
/* thread information allocation */
#endif /* __ASSEMBLY__ */
#define PREEMPT_ACTIVE 0x10000000
/*
* thread information flags
* - these are process state flags that various assembly files may
* need to access
* - pending work-to-be-done flags are in LSW
* - other flags in MSW
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
/* restore singlestep on return to user mode */
#define TIF_SINGLESTEP 4
#define TIF_IRET 5 /* return with iret */
#define TIF_MEMDIE 6
#define TIF_FREEZE 14 /* Freezing for suspend */
/* FIXME change in entry.S */
#define TIF_KERNEL_TRACE 8 /* kernel trace active */
/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_POLLING_NRFLAG 16
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_IRET (1<<TIF_IRET)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE (1<<TIF_FREEZE)
#define _TIF_KERNEL_TRACE (1 << TIF_KERNEL_TRACE)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK 0x0000FFFE
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK 0x0000FFFF
/*
* Thread-synchronous status.
*
* This is different from the flags in that nobody else
* ever touches our thread-synchronous status, so we don't
* have to worry about atomic accesses.
*/
/* FPU was used by this task this quantum (SMP) */
#define TS_USEDFPU 0x0001
#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
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