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/* thread_info.h: MIPS low-level thread information
*
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
*/
#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <asm/processor.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 thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
unsigned long flags; /* low level flags */
unsigned long tp_value; /* thread pointer */
__u32 cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
mm_segment_t addr_limit; /*
* thread address space limit:
* 0x7fffffff for user-thead
* 0xffffffff for kernel-thread
*/
struct restart_block restart_block;
struct pt_regs *regs;
};
/*
* macros/functions for gaining access to the thread information structure
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.exec_domain = &default_exec_domain, \
.flags = _TIF_FIXADE, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
.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 struct thread_info *__current_thread_info __asm__("$28");
return __current_thread_info;
}
#endif /* !__ASSEMBLY__ */
/* thread information allocation */
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
#define THREAD_SIZE_ORDER (1)
#endif
#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
#define THREAD_SIZE_ORDER (2)
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define THREAD_SIZE_ORDER (1)
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define THREAD_SIZE_ORDER (0)
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define THREAD_SIZE_ORDER (0)
#endif
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_MASK (THREAD_SIZE - 1UL)
#define STACK_WARN (THREAD_SIZE / 8)
/*
* 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_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
#define TIF_SECCOMP 4 /* secure computing */
#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_NOHZ 19 /* in adaptive nohz mode */
#define TIF_FIXADE 20 /* Fix address errors in software */
#define TIF_LOGADE 21 /* Log address errors to syslog */
#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
#define TIF_USEDMSA 29 /* MSA has been used this quantum */
#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_NOHZ (1<<TIF_NOHZ)
#define _TIF_FIXADE (1<<TIF_FIXADE)
#define _TIF_LOGADE (1<<TIF_LOGADE)
#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
#define _TIF_USEDMSA (1<<TIF_USEDMSA)
#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
_TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
/* work to do in syscall_trace_leave() */
#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
_TIF_WORK_SYSCALL_EXIT | \
_TIF_SYSCALL_TRACEPOINT)
/*
* We stash processor id into a COP0 register to retrieve it fast
* at kernel exception entry.
*/
#if defined(CONFIG_MIPS_MT_SMTC)
#define SMP_CPUID_REG 2, 2 /* TCBIND */
#define ASM_SMP_CPUID_REG $2, 2
#define SMP_CPUID_PTRSHIFT 19
#elif defined(CONFIG_MIPS_PGD_C0_CONTEXT)
#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
#define ASM_SMP_CPUID_REG $20
#define SMP_CPUID_PTRSHIFT 48
#else
#define SMP_CPUID_REG 4, 0 /* CONTEXT */
#define ASM_SMP_CPUID_REG $4
#define SMP_CPUID_PTRSHIFT 23
#endif
#ifdef CONFIG_64BIT
#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
#else
#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
#endif
#ifdef CONFIG_MIPS_MT_SMTC
#define ASM_CPUID_MFC0 mfc0
#define UASM_i_CPUID_MFC0 uasm_i_mfc0
#else
#define ASM_CPUID_MFC0 MFC0
#define UASM_i_CPUID_MFC0 UASM_i_MFC0
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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