Hi All,
The non-mmu and mmu versions of thread_info.h are quite similar.
The merge required a little cleanup of the definitions of THREAD_SIZE
and THREAD_SIZE_ORDER. I have tried to preserve the logic but simplified
the code.
Regards
Greg
m68k/m68knommu: merge MMU and non-MMU thread_info.h
The MMU and non-MMU versions of thread_info.h and quite similar.
Merge the two files.
Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxx>
---
.../asm/{thread_info_mm.h => thread_info.h} | 60 +++++++++---
arch/m68k/include/asm/thread_info_no.h | 102 --------------------
arch/m68knommu/platform/coldfire/entry.S | 4 +-
3 files changed, 47 insertions(+), 119 deletions(-)
rename arch/m68k/include/asm/{thread_info_mm.h => thread_info.h} (67%)
delete mode 100644 arch/m68k/include/asm/thread_info_no.h
diff --git a/arch/m68k/include/asm/thread_info_mm.h b/arch/m68k/include/asm/thread_info.h
similarity index 67%
rename from arch/m68k/include/asm/thread_info_mm.h
rename to arch/m68k/include/asm/thread_info.h
index d08046c..21171bf 100644
--- a/arch/m68k/include/asm/thread_info_mm.h
+++ b/arch/m68k/include/asm/thread_info.h
@@ -1,21 +1,33 @@
#ifndef _ASM_M68K_THREAD_INFO_H
#define _ASM_M68K_THREAD_INFO_H
-#ifndef ASM_OFFSETS_C
-#include <asm/asm-offsets.h>
-#endif
#include <asm/types.h>
#include <asm/page.h>
+/*
+ * On machines with 4k pages we default to an 8k thread size, though we
+ * allow a 4k with config option. Any other machine page size then
+ * the thread size must match the page size (which is 8k and larger here).
+ */
+#if PAGE_SHIFT < 13
+#ifdef CONFIG_4KSTACKS
+#define THREAD_SIZE 4096
+#else
+#define THREAD_SIZE 8192
+#endif
+#else
+#define THREAD_SIZE PAGE_SIZE
+#endif
+#define THREAD_SIZE_ORDER ((THREAD_SIZE / PAGE_SIZE) - 1)
+
#ifndef __ASSEMBLY__
-#include <asm/current.h>
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags;
struct exec_domain *exec_domain; /* execution domain */
int preempt_count; /* 0 => preemptable, <0 => BUG */
- __u32 cpu; /* should always be 0 on m68k */
+ __u32 cpu; /* should always be 0 on m68k */
unsigned long tp_value; /* thread pointer */
struct restart_block restart_block;
};
@@ -33,23 +45,20 @@ struct thread_info {
}, \
}
-/* THREAD_SIZE should be 8k, so handle differently for 4k and 8k machines */
-#if PAGE_SHIFT < 13
-#define THREAD_SIZE (8192)
-#else
-#define THREAD_SIZE PAGE_SIZE
-#endif
-#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
-
-#define init_thread_info (init_task.thread.info)
#define init_stack (init_thread_union.stack)
+#ifdef CONFIG_MMU
+
+#include <asm/current.h>
+
#ifdef ASM_OFFSETS_C
#define task_thread_info(tsk) ((struct thread_info *) NULL)
#else
+#include <asm/asm-offsets.h>
#define task_thread_info(tsk) ((struct thread_info *)((char *)tsk+TASK_TINFO))
#endif
+#define init_thread_info (init_task.thread.info)
#define task_stack_page(tsk) ((tsk)->stack)
#define current_thread_info() task_thread_info(current)
@@ -60,7 +69,28 @@ struct thread_info {
task_thread_info(p)->task = (p); \
})
-#define end_of_stack(p) ((unsigned long *)(p)->stack + 1)
+#define end_of_stack(p) ((unsigned long *)(p)->stack + 1)
+
+#else /* !CONFIG_MMU */
+
+#ifndef __ASSEMBLY__
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+ struct thread_info *ti;
+ __asm__(
+ "move.l %%sp, %0 \n\t"
+ "and.l %1, %0"
+ : "=&d"(ti)
+ : "di" (~(THREAD_SIZE-1))
+ );
+ return ti;
+}
+#endif
+
+#define init_thread_info (init_thread_union.thread_info)
+
+#endif /* CONFIG_MMU */
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
diff --git a/arch/m68k/include/asm/thread_info_no.h b/arch/m68k/include/asm/thread_info_no.h
deleted file mode 100644
index 51f354b..0000000
--- a/arch/m68k/include/asm/thread_info_no.h
+++ /dev/null
@@ -1,102 +0,0 @@
-/* thread_info.h: m68knommu low-level thread information
- * adapted from the i386 and PPC versions by Greg Ungerer (gerg@xxxxxxxxxxxx)
- *
- * Copyright (C) 2002 David Howells (dhowells@xxxxxxxxxx)
- * - Incorporating suggestions made by Linus Torvalds and Dave Miller
- */
-
-#ifndef _ASM_THREAD_INFO_H
-#define _ASM_THREAD_INFO_H
-
-#include <asm/page.h>
-
-#ifdef __KERNEL__
-
-/*
- * Size of kernel stack for each process. This must be a power of 2...
- */
-#ifdef CONFIG_4KSTACKS
-#define THREAD_SIZE_ORDER (0)
-#else
-#define THREAD_SIZE_ORDER (1)
-#endif
-
-/*
- * for asm files, THREAD_SIZE is now generated by asm-offsets.c
- */
-#define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)
-
-#ifndef __ASSEMBLY__
-
-/*
- * low level task data.
- */
-struct thread_info {
- struct task_struct *task; /* main task structure */
- struct exec_domain *exec_domain; /* execution domain */
- unsigned long flags; /* low level flags */
- int cpu; /* cpu we're on */
- int preempt_count; /* 0 => preemptable, <0 => BUG */
- unsigned long tp_value; /* thread pointer */
- 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, \
- .flags = 0, \
- .cpu = 0, \
- .preempt_count = INIT_PREEMPT_COUNT, \
- .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 */
-static inline struct thread_info *current_thread_info(void)
-{
- struct thread_info *ti;
- __asm__(
- "move.l %%sp, %0 \n\t"
- "and.l %1, %0"
- : "=&d"(ti)
- : "di" (~(THREAD_SIZE-1))
- );
- return ti;
-}
-
-#endif /* __ASSEMBLY__ */
-
-#define PREEMPT_ACTIVE 0x4000000
-
-/*
- * 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_MEMDIE 4 /* is terminating due to OOM killer */
-#define TIF_FREEZE 16 /* is freezing for suspend */
-
-/* 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_FREEZE (1<<TIF_FREEZE)
-
-#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
-
-#endif /* __KERNEL__ */
-
-#endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/m68knommu/platform/coldfire/entry.S b/arch/m68knommu/platform/coldfire/entry.S
index dd7d591..cd79d7e 100644
--- a/arch/m68knommu/platform/coldfire/entry.S
+++ b/arch/m68knommu/platform/coldfire/entry.S
@@ -112,7 +112,7 @@ ret_from_exception:
andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
movel %d1,%a0
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
- andl #_TIF_NEED_RESCHED,%d1
+ andl #(1<<TIF_NEED_RESCHED),%d1
jeq Lkernel_return
movel %a0@(TI_PREEMPTCOUNT),%d1
@@ -136,7 +136,7 @@ Luser_return:
andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
movel %d1,%a0
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
- andl #_TIF_WORK_MASK,%d1
+ andl #0xefff,%d1
jne Lwork_to_do /* still work to do */
Lreturn:
--
1.6.3.3
--
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