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| -rw-r--r-- | arch/hexagon/include/asm/thread_info.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h new file mode 100644 index 000000000000..9c2934ff5756 --- /dev/null +++ b/arch/hexagon/include/asm/thread_info.h @@ -0,0 +1,154 @@ +/* + * Thread support for the Hexagon architecture + * + * Copyright (c) 2010-2011, Code Aurora Forum. 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) + +#if THREAD_SHIFT >= PAGE_SHIFT +#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) +#else /* don't use standard allocator */ +#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR +extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node); +extern void free_thread_info(struct thread_info *ti); +#endif + + +#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 */ + struct exec_domain *exec_domain; /* execution domain */ + 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 + */ + struct restart_block restart_block; + /* 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__ */ + +/* looks like "linux/hardirq.h" uses this. */ + +#define PREEMPT_ACTIVE 0x10000000 + +#ifndef __ASSEMBLY__ + +#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, \ + }, \ + .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_IRET 5 /* return with iret */ +#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ +/* true if poll_idle() is polling TIF_NEED_RESCHED */ +#define TIF_POLLING_NRFLAG 16 +#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) +#define _TIF_IRET (1 << TIF_IRET) +#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) + +/* 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 |