diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/include/asm/thread_info.h')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/include/asm/thread_info.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/thread_info.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/thread_info.h new file mode 100644 index 000000000..55c69dadd --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/thread_info.h @@ -0,0 +1,134 @@ +/* + * arch/ubicom32/include/asm/thread_info.h + * Ubicom32 architecture low-level thread information. + * + * (C) Copyright 2009, Ubicom, Inc. + * Adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com) + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + */ + +#ifndef _ASM_UBICOM32_THREAD_INFO_H +#define _ASM_UBICOM32_THREAD_INFO_H + +#include <asm/page.h> + +/* + * Size of kernel stack for each process. This must be a power of 2... + */ +#ifdef CONFIG_4KSTACKS +#define THREAD_SIZE_ORDER (0) +#else +#define THREAD_SIZE_ORDER (1) +#endif + +/* + * for asm files, THREAD_SIZE is now generated by asm-offsets.c + */ +#define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER) + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +/* + * low level task data. + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + struct exec_domain *exec_domain; /* execution domain */ + unsigned long flags; /* low level flags */ + int cpu; /* cpu we're on */ + int preempt_count; /* 0 => preemptable, <0 => BUG */ + int interrupt_nesting; /* Interrupt nesting level. */ + struct restart_block restart_block; +}; + +/* + * macros/functions for gaining access to the thread information structure + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .flags = 0, \ + .cpu = 0, \ + .interrupt_nesting = 0, \ + .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) +{ + struct thread_info *ti; + + asm ( + "and.4 %0, sp, %1\n\t" + : "=&r" (ti) + : "d" (~(THREAD_SIZE-1)) + : "cc" + ); + + return ti; +} + +#define STACK_WARN (THREAD_SIZE / 8) + +#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 1 + +/* thread information allocation */ +#define alloc_thread_info(tsk) ((struct thread_info *) \ + __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) +#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_SIZE_ORDER) +#endif /* __ASSEMBLY__ */ + +#define PREEMPT_ACTIVE 0x4000000 + +/* + * thread information flag bit numbers + */ +#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_SIGPENDING 1 /* signal pending */ +#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ +#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling + TIF_NEED_RESCHED */ +#define TIF_MEMDIE 4 + +/* as above, but as bit values */ +#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) + +#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_UBICOM32_THREAD_INFO_H */ |