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linux/include/asm-sparc64/thread_info.h
Jesper Juhl dcd497f99a [PATCH] streamline preempt_count type across archs 
The preempt_count member of struct thread_info is currently either defined
as int, unsigned int or __s32 depending on arch.  This patch makes the type
of preempt_count an int on all archs.

Having preempt_count be an unsigned type prevents the catching of
preempt_count < 0 bugs, and using int on some archs and __s32 on others is
not exactely "neat" - much nicer when it's just int all over.

A previous version of this patch was already ACK'ed by Robert Love, and the
only change in this version of the patch compared to the one he ACK'ed is
that this one also makes sure the preempt_count member is consistently
commented.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:19 -07:00

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/* $Id: thread_info.h,v 1.1 2002/02/10 00:00:58 davem Exp $
* thread_info.h: sparc64 low-level thread information
*
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
*/
#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H
#ifdef __KERNEL__
#define NSWINS 7
#define TI_FLAG_BYTE_FAULT_CODE 0
#define TI_FLAG_FAULT_CODE_SHIFT 56
#define TI_FLAG_BYTE_WSTATE 1
#define TI_FLAG_WSTATE_SHIFT 48
#define TI_FLAG_BYTE_CWP 2
#define TI_FLAG_CWP_SHIFT 40
#define TI_FLAG_BYTE_CURRENT_DS 3
#define TI_FLAG_CURRENT_DS_SHIFT 32
#define TI_FLAG_BYTE_FPDEPTH 4
#define TI_FLAG_FPDEPTH_SHIFT 24
#define TI_FLAG_BYTE_WSAVED 5
#define TI_FLAG_WSAVED_SHIFT 16
#include <asm/page.h>
#ifndef __ASSEMBLY__
#include <asm/ptrace.h>
#include <asm/types.h>
struct task_struct;
struct exec_domain;
struct thread_info {
/* D$ line 1 */
struct task_struct *task;
unsigned long flags;
__u8 cpu;
__u8 fpsaved[7];
unsigned long ksp;
/* D$ line 2 */
unsigned long fault_address;
struct pt_regs *kregs;
struct exec_domain *exec_domain;
int preempt_count; /* 0 => preemptable, <0 => BUG */
int __pad;
unsigned long *utraps;
struct reg_window reg_window[NSWINS];
unsigned long rwbuf_stkptrs[NSWINS];
unsigned long gsr[7];
unsigned long xfsr[7];
__u64 __user *user_cntd0;
__u64 __user *user_cntd1;
__u64 kernel_cntd0, kernel_cntd1;
__u64 pcr_reg;
__u64 cee_stuff;
struct restart_block restart_block;
unsigned long fpregs[0] __attribute__ ((aligned(64)));
};
#endif /* !(__ASSEMBLY__) */
/* offsets into the thread_info struct for assembly code access */
#define TI_TASK 0x00000000
#define TI_FLAGS 0x00000008
#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
#define TI_CPU 0x00000010
#define TI_FPSAVED 0x00000011
#define TI_KSP 0x00000018
#define TI_FAULT_ADDR 0x00000020
#define TI_KREGS 0x00000028
#define TI_EXEC_DOMAIN 0x00000030
#define TI_PRE_COUNT 0x00000038
#define TI_UTRAPS 0x00000040
#define TI_REG_WINDOW 0x00000048
#define TI_RWIN_SPTRS 0x000003c8
#define TI_GSR 0x00000400
#define TI_XFSR 0x00000438
#define TI_USER_CNTD0 0x00000470
#define TI_USER_CNTD1 0x00000478
#define TI_KERN_CNTD0 0x00000480
#define TI_KERN_CNTD1 0x00000488
#define TI_PCR 0x00000490
#define TI_CEE_STUFF 0x00000498
#define TI_RESTART_BLOCK 0x000004a0
#define TI_FPREGS 0x00000500
/* We embed this in the uppermost byte of thread_info->flags */
#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
#if PAGE_SHIFT == 13
#define THREAD_SIZE (2*PAGE_SIZE)
#define THREAD_SHIFT (PAGE_SHIFT + 1)
#else /* PAGE_SHIFT == 13 */
#define THREAD_SIZE PAGE_SIZE
#define THREAD_SHIFT PAGE_SHIFT
#endif /* PAGE_SHIFT == 13 */
#define PREEMPT_ACTIVE 0x4000000
/*
* macros/functions for gaining access to the thread information structure
*
* preempt_count needs to be 1 initially, until the scheduler is functional.
*/
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
.exec_domain = &default_exec_domain, \
.preempt_count = 1, \
.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 */
register struct thread_info *current_thread_info_reg asm("g6");
#define current_thread_info() (current_thread_info_reg)
/* thread information allocation */
#if PAGE_SHIFT == 13
#define __THREAD_INFO_ORDER 1
#else /* PAGE_SHIFT == 13 */
#define __THREAD_INFO_ORDER 0
#endif /* PAGE_SHIFT == 13 */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk) \
({ \
struct thread_info *ret; \
\
ret = (struct thread_info *) \
__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
if (ret) \
memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
ret; \
})
#else
#define alloc_thread_info(tsk) \
((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
#endif
#define free_thread_info(ti) \
free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
#define __thread_flag_byte_ptr(ti) \
((unsigned char *)(&((ti)->flags)))
#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
#endif /* !(__ASSEMBLY__) */
/*
* Thread information flags, only 16 bits are available as we encode
* other values into the upper 6 bytes.
*
* On trap return we need to test several values:
*
* user: need_resched, notify_resume, sigpending, wsaved, perfctr
* kernel: fpdepth
*
* So to check for work in the kernel case we simply load the fpdepth
* byte out of the flags and test it. For the user case we encode the
* lower 3 bytes of flags as follows:
* ----------------------------------------
* | wsaved | flags byte 1 | flags byte 2 |
* ----------------------------------------
* This optimizes the user test into:
* ldx [%g6 + TI_FLAGS], REG1
* sethi %hi(_TIF_USER_WORK_MASK), REG2
* or REG2, %lo(_TIF_USER_WORK_MASK), REG2
* andcc REG1, REG2, %g0
* be,pt no_work_to_do
* nop
*/
#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 */
#define TIF_PERFCTR 4 /* performance counters active */
#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
#define TIF_NEWSIGNALS 6 /* wants new-style signals */
#define TIF_32BIT 7 /* 32-bit binary */
#define TIF_NEWCHILD 8 /* just-spawned child process */
/* TIF_* value 9 is available */
#define TIF_POLLING_NRFLAG 10
#define TIF_SYSCALL_SUCCESS 11
/* NOTE: Thread flags >= 12 should be ones we have no interest
* in using in assembly, else we can't use the mask as
* an immediate value in instructions such as andcc.
*/
#define TIF_ABI_PENDING 12
#define TIF_MEMDIE 13
#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_PERFCTR (1<<TIF_PERFCTR)
#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
#define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
#define _TIF_32BIT (1<<TIF_32BIT)
#define _TIF_NEWCHILD (1<<TIF_NEWCHILD)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_SUCCESS (1<<TIF_SYSCALL_SUCCESS)
#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
_TIF_NEED_RESCHED | _TIF_PERFCTR))
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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