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Diffstat (limited to 'include/asm-powerpc/thread_info.h')
| -rw-r--r-- | include/asm-powerpc/thread_info.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h new file mode 100644 index 00000000000..ab17db79f69 --- /dev/null +++ b/include/asm-powerpc/thread_info.h @@ -0,0 +1,142 @@ +/* thread_info.h: PowerPC low-level thread information + * adapted from the i386 version by Paul Mackerras + * + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + */ + +#ifndef _ASM_POWERPC_THREAD_INFO_H +#define _ASM_POWERPC_THREAD_INFO_H + +#ifdef __KERNEL__ + +/* We have 8k stacks on ppc32 and 16k on ppc64 */ + +#ifdef CONFIG_PPC64 +#define THREAD_SHIFT 14 +#else +#define THREAD_SHIFT 13 +#endif + +#define THREAD_SIZE (1 << THREAD_SHIFT) + +#ifndef __ASSEMBLY__ +#include <linux/config.h> +#include <linux/cache.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <linux/stringify.h> + +/* + * low level task data. + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + struct exec_domain *exec_domain; /* execution domain */ + int cpu; /* cpu we're on */ + int preempt_count; /* 0 => preemptable, + <0 => BUG */ + struct restart_block restart_block; + /* set by force_successful_syscall_return */ + unsigned char syscall_noerror; + /* low level flags - has atomic operations done on it */ + unsigned long flags ____cacheline_aligned_in_smp; +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .cpu = 0, \ + .preempt_count = 1, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ + .flags = 0, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +/* thread information allocation */ + +#ifdef CONFIG_DEBUG_STACK_USAGE +#define THREAD_INFO_GFP GFP_KERNEL | __GFP_ZERO +#else +#define THREAD_INFO_GFP GFP_KERNEL +#endif + +#if THREAD_SHIFT >= PAGE_SHIFT + +#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) + +#define alloc_thread_info(tsk) \ + ((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER)) +#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) + +#else /* THREAD_SHIFT < PAGE_SHIFT */ + +#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, THREAD_INFO_GFP) +#define free_thread_info(ti) kfree(ti) + +#endif /* THREAD_SHIFT < PAGE_SHIFT */ + +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +/* how to get the thread information struct from C */ +static inline struct thread_info *current_thread_info(void) +{ + register unsigned long sp asm("r1"); + + /* gcc4, at least, is smart enough to turn this into a single + * rlwinm for ppc32 and clrrdi for ppc64 */ + return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); +} + +#endif /* __ASSEMBLY__ */ + +#define PREEMPT_ACTIVE 0x10000000 + +/* + * thread information flag bit numbers + */ +#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_POLLING_NRFLAG 4 /* true if poll_idle() is polling + TIF_NEED_RESCHED */ +#define TIF_32BIT 5 /* 32 bit binary */ +/* #define SPARE 6 */ +#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ +#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ +#define TIF_SINGLESTEP 9 /* singlestepping active */ +#define TIF_MEMDIE 10 +#define TIF_SECCOMP 11 /* secure computing */ + +/* as above, but as bit values */ +#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_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) +#define _TIF_32BIT (1<<TIF_32BIT) +/* #define _SPARE (1<<SPARE) */ +#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) +#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) +#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) +#define _TIF_SECCOMP (1<<TIF_SECCOMP) +#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) + +#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ + _TIF_NEED_RESCHED) + +#endif /* __KERNEL__ */ + +#endif /* _ASM_POWERPC_THREAD_INFO_H */ |