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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/score/include/asm/thread_info.h
Initial import
Diffstat (limited to 'arch/score/include/asm/thread_info.h')
-rw-r--r--arch/score/include/asm/thread_info.h92
1 files changed, 92 insertions, 0 deletions
diff --git a/arch/score/include/asm/thread_info.h b/arch/score/include/asm/thread_info.h
new file mode 100644
index 000000000..7d9ffb15c
--- /dev/null
+++ b/arch/score/include/asm/thread_info.h
@@ -0,0 +1,92 @@
+#ifndef _ASM_SCORE_THREAD_INFO_H
+#define _ASM_SCORE_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#define KU_MASK 0x08
+#define KU_USER 0x08
+#define KU_KERN 0x00
+
+#include <asm/page.h>
+#include <linux/const.h>
+
+/* thread information allocation */
+#define THREAD_SIZE_ORDER (1)
+#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
+#define THREAD_MASK (THREAD_SIZE - _AC(1,UL))
+
+#ifndef __ASSEMBLY__
+
+#include <asm/processor.h>
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants
+ * must also be changed
+ */
+struct thread_info {
+ struct task_struct *task; /* main task structure */
+ unsigned long flags; /* low level flags */
+ unsigned long tp_value; /* thread pointer */
+ __u32 cpu; /* current CPU */
+
+ /* 0 => preemptable, < 0 => BUG */
+ int preempt_count;
+
+ /*
+ * thread address space:
+ * 0-0xBFFFFFFF for user-thead
+ * 0-0xFFFFFFFF for kernel-thread
+ */
+ mm_segment_t addr_limit;
+ struct pt_regs *regs;
+};
+
+/*
+ * 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, \
+ .cpu = 0, \
+ .preempt_count = 1, \
+ .addr_limit = KERNEL_DS, \
+}
+
+#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__("r28");
+#define current_thread_info() __current_thread_info
+
+#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_NOTIFY_RESUME 5 /* callback before returning to user */
+#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
+#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
+
+#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
+
+#define _TIF_WORK_MASK (0x0000ffff)
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_SCORE_THREAD_INFO_H */