[patch 07/36] Hexagon: Add threadinfo
From: Richard Kuo
Date: Wed Aug 17 2011 - 13:05:43 EST
Signed-off-by: Richard Kuo <rkuo@xxxxxxxxxxxxxx>
---
arch/hexagon/include/asm/current.h | 6 +
arch/hexagon/include/asm/thread_info.h | 197 +++++++++++++++++++++++++++++++++
2 files changed, 203 insertions(+)
Index: linux-hexagon-kernel/arch/hexagon/include/asm/current.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/include/asm/current.h 2011-07-20 15:19:37.415153317 -0500
@@ -0,0 +1,6 @@
+#ifndef _ASM_CURRENT_H
+#define _ASM_CURRENT_H
+
+#include <asm-generic/current.h>
+
+#endif /* _ASM_CURRENT_H */
Index: linux-hexagon-kernel/arch/hexagon/include/asm/thread_info.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/include/asm/thread_info.h 2011-07-20 15:19:37.415153317 -0500
@@ -0,0 +1,197 @@
+/*
+ * Thread support for the Hexagon architecture
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef _ASM_THREAD_INFO_H
+#define _ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <asm/registers.h>
+#endif
+
+/*
+ * order is for __get_free_pages; see get_order()
+ */
+
+#ifdef CONFIG_PAGE_SIZE_4KB
+#define THREAD_SIZE (1<<13)
+#define THREAD_SIZE_ORDER 1
+#endif
+
+#ifdef CONFIG_PAGE_SIZE_16KB
+#define THREAD_SIZE (1<<14)
+#define THREAD_SIZE_ORDER 0
+#endif
+
+#ifdef CONFIG_PAGE_SIZE_64KB
+#define THREAD_SIZE (1<<16)
+#define THREAD_SIZE_ORDER 0
+#endif
+
+#ifdef CONFIG_PAGE_SIZE_256KB
+#define THREAD_SIZE (1<<18)
+#define THREAD_SIZE_ORDER 0
+#endif
+
+#ifndef __ASSEMBLY__
+
+typedef struct {
+ unsigned long seg;
+} mm_segment_t;
+
+/*
+ * This is union'd with the "bottom" of the kernel stack.
+ * It keeps track of thread info which is handy for routines
+ * to access quickly.
+ */
+
+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; /* current cpu */
+ int preempt_count; /* 0=>preemptible,<0=>BUG */
+ mm_segment_t addr_limit; /* segmentation sux */
+ /*
+ * used for syscalls somehow;
+ * seems to have a function pointer and four arguments
+ */
+ struct restart_block restart_block;
+ /* Points to the current pt_regs frame */
+ struct pt_regs *regs;
+ /*
+ * saved kernel sp at switch_to time;
+ * not sure if this is used (it's not in the VM model it seems;
+ * see thread_struct)
+ */
+ unsigned long sp;
+};
+
+#else /* !__ASSEMBLY__ */
+
+#include <asm/asm-offsets.h>
+
+#endif /* __ASSEMBLY__ */
+
+/* looks like "linux/hardirq.h" uses this. */
+
+#define PREEMPT_ACTIVE 0x10000000
+
+#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, \
+ }, \
+ .sp = 0, \
+ .regs = NULL, \
+}
+
+#define init_thread_info (init_thread_union.thread_info)
+#define init_stack (init_thread_union.stack)
+
+/* Tacky preprocessor trickery */
+#define qqstr(s) qstr(s)
+#define qstr(s) #s
+#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
+
+register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
+#define current_thread_info() __current_thread_info
+
+/* defined in process.c */
+#if 0
+extern void free_thread_info(struct thread_info *thread);
+#endif
+
+/* thread information allocation */
+
+/*
+ * kmalloc is probably not appropriate because alignment seems
+ * not guaranteed out of kmalloc at all, and we assume thread_info
+ * is aligned to THREAD_SIZE all over the place, notably the switch and
+ * entry/exit routines.
+ */
+
+#if 0
+#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk) \
+ ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \
+ THREAD_SIZE_ORDER))
+
+#else /* CONFIG_DEBUG_STACK_USAGE */
+#define alloc_thread_info(tsk) \
+ ((struct thread_info *)__get_free_pages(GFP_KERNEL, \
+ THREAD_SIZE_ORDER))
+#endif /* ! CONFIG_DEBUG_STACK_USAGE */
+
+
+#define free_thread_info(info) \
+ free_pages((unsigned long)info, THREAD_SIZE_ORDER);
+#endif
+
+#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_NOTIFY_RESUME 1 /* resumption notification requested */
+#define TIF_SIGPENDING 2 /* signal pending */
+#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
+#define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
+#define TIF_IRET 5 /* return with iret */
+#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
+/* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_POLLING_NRFLAG 16
+#define TIF_MEMDIE 17 /* OOM killer killed process */
+
+#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_SINGLESTEP (1 << TIF_SINGLESTEP)
+#define _TIF_IRET (1 << TIF_IRET)
+#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
+#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
+
+/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
+#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
+
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK 0x0000FFFF
+
+#endif /* __KERNEL__ */
+
+#endif
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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