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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/powerpc/include/asm/thread_info.h
Initial import
Diffstat (limited to 'arch/powerpc/include/asm/thread_info.h')
-rw-r--r--arch/powerpc/include/asm/thread_info.h192
1 files changed, 192 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
new file mode 100644
index 000000000..7efee4a32
--- /dev/null
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -0,0 +1,192 @@
+/* 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 */
+
+#if defined(CONFIG_PPC64)
+#define THREAD_SHIFT 14
+#elif defined(CONFIG_PPC_256K_PAGES)
+#define THREAD_SHIFT 15
+#else
+#define THREAD_SHIFT 13
+#endif
+
+#define THREAD_SIZE (1 << THREAD_SHIFT)
+
+#ifdef CONFIG_PPC64
+#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
+#else
+#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
+#endif
+
+#ifndef __ASSEMBLY__
+#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 */
+ int cpu; /* cpu we're on */
+ int preempt_count; /* 0 => preemptable,
+ <0 => BUG */
+ unsigned long local_flags; /* private flags for thread */
+
+ /* 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
+ */
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .task = &tsk, \
+ .cpu = 0, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
+ .flags = 0, \
+}
+
+#define init_thread_info (init_thread_union.thread_info)
+#define init_stack (init_thread_union.stack)
+
+#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
+
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+ unsigned long val;
+
+ asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
+
+ return (struct thread_info *)val;
+}
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * 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_32BIT 4 /* 32 bit binary */
+#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
+#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
+#define TIF_SINGLESTEP 8 /* singlestepping active */
+#define TIF_NOHZ 9 /* in adaptive nohz mode */
+#define TIF_SECCOMP 10 /* secure computing */
+#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
+#define TIF_NOERROR 12 /* Force successful syscall return */
+#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
+#define TIF_UPROBE 14 /* breakpointed or single-stepping */
+#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
+#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
+ for stack store? */
+#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
+#if defined(CONFIG_PPC64)
+#define TIF_ELF2ABI 18 /* function descriptors must die! */
+#endif
+
+/* 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_32BIT (1<<TIF_32BIT)
+#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
+#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
+#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
+#define _TIF_SECCOMP (1<<TIF_SECCOMP)
+#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
+#define _TIF_NOERROR (1<<TIF_NOERROR)
+#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
+#define _TIF_UPROBE (1<<TIF_UPROBE)
+#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
+#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
+#define _TIF_NOHZ (1<<TIF_NOHZ)
+#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
+ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
+ _TIF_NOHZ)
+
+#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
+ _TIF_RESTORE_TM)
+#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
+
+/* Bits in local_flags */
+/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
+#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
+#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
+#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
+#define TLF_LAZY_MMU 3 /* tlb_batch is active */
+#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
+
+#define _TLF_NAPPING (1 << TLF_NAPPING)
+#define _TLF_SLEEPING (1 << TLF_SLEEPING)
+#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
+#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
+#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
+
+#ifndef __ASSEMBLY__
+#define HAVE_SET_RESTORE_SIGMASK 1
+static inline void set_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ ti->local_flags |= _TLF_RESTORE_SIGMASK;
+ WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
+}
+static inline void clear_restore_sigmask(void)
+{
+ current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
+}
+static inline bool test_restore_sigmask(void)
+{
+ return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
+}
+static inline bool test_and_clear_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
+ return false;
+ ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
+ return true;
+}
+
+static inline bool test_thread_local_flags(unsigned int flags)
+{
+ struct thread_info *ti = current_thread_info();
+ return (ti->local_flags & flags) != 0;
+}
+
+#ifdef CONFIG_PPC64
+#define is_32bit_task() (test_thread_flag(TIF_32BIT))
+#else
+#define is_32bit_task() (1)
+#endif
+
+#if defined(CONFIG_PPC64)
+#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
+#else
+#define is_elf2_task() (0)
+#endif
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_POWERPC_THREAD_INFO_H */