summaryrefslogtreecommitdiffstats
path: root/arch/alpha/include/asm/thread_info.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/alpha/include/asm/thread_info.h')
-rw-r--r--arch/alpha/include/asm/thread_info.h114
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
new file mode 100644
index 00000000000..15fda434442
--- /dev/null
+++ b/arch/alpha/include/asm/thread_info.h
@@ -0,0 +1,114 @@
+#ifndef _ALPHA_THREAD_INFO_H
+#define _ALPHA_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <asm/types.h>
+#include <asm/hwrpb.h>
+#endif
+
+#ifndef __ASSEMBLY__
+struct thread_info {
+ struct pcb_struct pcb; /* palcode state */
+
+ struct task_struct *task; /* main task structure */
+ unsigned int flags; /* low level flags */
+ unsigned int ieee_state; /* see fpu.h */
+
+ struct exec_domain *exec_domain; /* execution domain */
+ mm_segment_t addr_limit; /* thread address space */
+ unsigned cpu; /* current CPU */
+ int preempt_count; /* 0 => preemptable, <0 => BUG */
+
+ int bpt_nsaved;
+ unsigned long bpt_addr[2]; /* breakpoint handling */
+ unsigned int bpt_insn[2];
+
+ 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, \
+ .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 thread information struct from C. */
+register struct thread_info *__current_thread_info __asm__("$8");
+#define current_thread_info() __current_thread_info
+
+/* Thread information allocation. */
+#define THREAD_SIZE_ORDER 1
+#define THREAD_SIZE (2*PAGE_SIZE)
+
+#endif /* __ASSEMBLY__ */
+
+#define PREEMPT_ACTIVE 0x40000000
+
+/*
+ * Thread information flags:
+ * - these are process state flags and used from assembly
+ * - pending work-to-be-done flags come first to fit in and immediate operand.
+ *
+ * TIF_SYSCALL_TRACE is known to be 0 via blbs.
+ */
+#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 /* poll_idle is polling NEED_RESCHED */
+#define TIF_DIE_IF_KERNEL 4 /* dik recursion lock */
+#define TIF_UAC_NOPRINT 5 /* see sysinfo.h */
+#define TIF_UAC_NOFIX 6
+#define TIF_UAC_SIGBUS 7
+#define TIF_MEMDIE 8
+#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
+
+#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_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
+
+/* Work to do on interrupt/exception return. */
+#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
+
+/* Work to do on any return to userspace. */
+#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
+ | _TIF_SYSCALL_TRACE)
+
+#define ALPHA_UAC_SHIFT 6
+#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
+ 1 << TIF_UAC_SIGBUS)
+
+#define SET_UNALIGN_CTL(task,value) ({ \
+ task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
+ ~ALPHA_UAC_MASK) \
+ | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
+ | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
+ | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
+ 0; })
+
+#define GET_UNALIGN_CTL(task,value) ({ \
+ put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
+ >> ALPHA_UAC_SHIFT \
+ | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
+ >> (ALPHA_UAC_SHIFT + 1) \
+ | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
+ >> (ALPHA_UAC_SHIFT - 1), \
+ (int __user *)(value)); \
+ })
+
+#endif /* __KERNEL__ */
+#endif /* _ALPHA_THREAD_INFO_H */