/* * Thread support for the Hexagon architecture * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * 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., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ #ifndef __ASSEMBLY__ #include <asm/processor.h> #include <asm/registers.h> #include <asm/page.h> #endif #define THREAD_SHIFT 12 #define THREAD_SIZE (1<<THREAD_SHIFT) #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) #ifndef __ASSEMBLY__ typedef struct { unsigned long seg; } mm_segment_t; /* * This is union'd with the "bottom" of the kernel stack. * It keeps track of thread info which is handy for routines * to access quickly. */ struct thread_info { struct task_struct *task; /* main task structure */ unsigned long flags; /* low level flags */ __u32 cpu; /* current cpu */ int preempt_count; /* 0=>preemptible,<0=>BUG */ mm_segment_t addr_limit; /* segmentation sux */ /* * used for syscalls somehow; * seems to have a function pointer and four arguments */ /* Points to the current pt_regs frame */ struct pt_regs *regs; /* * saved kernel sp at switch_to time; * not sure if this is used (it's not in the VM model it seems; * see thread_struct) */ unsigned long sp; }; #else /* !__ASSEMBLY__ */ #include <asm/asm-offsets.h> #endif /* __ASSEMBLY__ */ #ifndef __ASSEMBLY__ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ .addr_limit = KERNEL_DS, \ .sp = 0, \ .regs = NULL, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* Tacky preprocessor trickery */ #define qqstr(s) qstr(s) #define qstr(s) #s #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG) register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); #define current_thread_info() __current_thread_info #endif /* __ASSEMBLY__ */ /* * 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 */ #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */ #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 17 /* OOM killer killed process */ #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) /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE) /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK 0x0000FFFF #endif /* __KERNEL__ */ #endif