diff options
Diffstat (limited to 'arch/sh/include/asm/thread_info.h')
| -rw-r--r-- | arch/sh/include/asm/thread_info.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h new file mode 100644 index 00000000000..eeb4c747119 --- /dev/null +++ b/arch/sh/include/asm/thread_info.h @@ -0,0 +1,141 @@ +#ifndef __ASM_SH_THREAD_INFO_H +#define __ASM_SH_THREAD_INFO_H + +/* SuperH version + * Copyright (C) 2002 Niibe Yutaka + * + * The copyright of original i386 version is: + * + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + */ +#ifdef __KERNEL__ +#include <asm/page.h> + +#ifndef __ASSEMBLY__ +#include <asm/processor.h> + +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; + int preempt_count; /* 0 => preemptable, <0 => BUG */ + mm_segment_t addr_limit; /* thread address space */ + struct restart_block restart_block; + unsigned long previous_sp; /* sp of previous stack in case + of nested IRQ stacks */ + __u8 supervisor_stack[0]; +}; + +#endif + +#define PREEMPT_ACTIVE 0x10000000 + +#if defined(CONFIG_4KSTACKS) +#define THREAD_SIZE_ORDER (0) +#elif defined(CONFIG_PAGE_SIZE_4KB) +#define THREAD_SIZE_ORDER (1) +#elif defined(CONFIG_PAGE_SIZE_8KB) +#define THREAD_SIZE_ORDER (1) +#elif defined(CONFIG_PAGE_SIZE_16KB) +#define THREAD_SIZE_ORDER (0) +#elif defined(CONFIG_PAGE_SIZE_64KB) +#define THREAD_SIZE_ORDER (0) +#else +#error "Unknown thread size" +#endif + +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) +#define STACK_WARN (THREAD_SIZE >> 3) + +/* + * macros/functions for gaining access to the thread information structure + */ +#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, \ + }, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +/* how to get the current stack pointer from C */ +register unsigned long current_stack_pointer asm("r15") __used; + +/* how to get the thread information struct from C */ +static inline struct thread_info *current_thread_info(void) +{ + struct thread_info *ti; +#if defined(CONFIG_SUPERH64) + __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); +#elif defined(CONFIG_CPU_HAS_SR_RB) + __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); +#else + unsigned long __dummy; + + __asm__ __volatile__ ( + "mov r15, %0\n\t" + "and %1, %0\n\t" + : "=&r" (ti), "=r" (__dummy) + : "1" (~(THREAD_SIZE - 1)) + : "memory"); +#endif + + return ti; +} + +#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR + +/* thread information allocation */ +#ifdef CONFIG_DEBUG_STACK_USAGE +#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL) +#else +#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL) +#endif +#define free_thread_info(ti) kfree(ti) + +#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_SIGPENDING 1 /* signal pending */ +#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ +#define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */ +#define TIF_SINGLESTEP 4 /* singlestepping active */ +#define TIF_SYSCALL_AUDIT 5 +#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ +#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ +#define TIF_MEMDIE 18 +#define TIF_FREEZE 19 + +#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) +#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) +#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) +#define _TIF_USEDFPU (1<<TIF_USEDFPU) +#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) +#define _TIF_FREEZE (1<<TIF_FREEZE) + +#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */ +#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */ + +#endif /* __KERNEL__ */ + +#endif /* __ASM_SH_THREAD_INFO_H */ |