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Message-Id: <200906170711.n5H7B4DY009020@localhost.localdomain>
Date: Wed, 17 Jun 2009 17:11:04 +1000
From: Greg Ungerer <gerg@...pgear.com>
To: linux-kernel@...r.kernel.org
Cc: gerg@...inux.org, linux-m68k@...r.kernel.org
Subject: [PATCH] m68k: merge mmu and non-mmu versions of processor.h
[PATCH] m68k: merge mmu and non-mmu versions of processor.h
The mmu and non-mmu versions of processor.h have a lot of common code.
This is a strait forward merge. start_thread() could be improved, but
that is not quite as strait forward, leaving for a follow on change.
Signed-off-by: Greg Ungerer <gerg@...inux.org>
---
.../include/asm/{processor_mm.h => processor.h} | 42 ++++++-
arch/m68k/include/asm/processor_no.h | 143 --------------------
2 files changed, 41 insertions(+), 144 deletions(-)
rename arch/m68k/include/asm/{processor_mm.h => processor.h} (75%)
delete mode 100644 arch/m68k/include/asm/processor_no.h
diff --git a/arch/m68k/include/asm/processor_mm.h b/arch/m68k/include/asm/processor.h
similarity index 75%
rename from arch/m68k/include/asm/processor_mm.h
rename to arch/m68k/include/asm/processor.h
index 1f61ef5..74fd674 100644
--- a/arch/m68k/include/asm/processor_mm.h
+++ b/arch/m68k/include/asm/processor.h
@@ -20,15 +20,24 @@
static inline unsigned long rdusp(void)
{
+#ifdef CONFIG_COLDFIRE
+ extern unsigned int sw_usp;
+ return sw_usp;
+#else
unsigned long usp;
-
__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
return usp;
+#endif
}
static inline void wrusp(unsigned long usp)
{
+#ifdef CONFIG_COLDFIRE
+ extern unsigned int sw_usp;
+ sw_usp = usp;
+#else
__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
+#endif
}
/*
@@ -49,12 +58,16 @@ static inline void wrusp(unsigned long usp)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
+#ifdef CONFIG_MMU
#ifndef CONFIG_SUN3
#define TASK_UNMAPPED_BASE 0xC0000000UL
#else
#define TASK_UNMAPPED_BASE 0x0A000000UL
#endif
#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
+#else
+#define TASK_UNMAPPED_BASE 0
+#endif
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
@@ -78,6 +91,7 @@ struct thread_struct {
.info = INIT_THREAD_INFO(init_task), \
}
+#ifdef CONFIG_MMU
/*
* Do necessary setup to start up a newly executed thread.
*/
@@ -92,6 +106,32 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc,
wrusp(usp);
}
+#else
+
+/*
+ * Coldfire stacks need to be re-aligned on trap exit, conventional
+ * 68k can handle this case cleanly.
+ */
+#ifdef CONFIG_COLDFIRE
+#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
+#else
+#define reformat(_regs) do { } while (0)
+#endif
+
+#define start_thread(_regs, _pc, _usp) \
+do { \
+ set_fs(USER_DS); /* reads from user space */ \
+ (_regs)->pc = (_pc); \
+ ((struct switch_stack *)(_regs))[-1].a6 = 0; \
+ reformat(_regs); \
+ if (current->mm) \
+ (_regs)->d5 = current->mm->start_data; \
+ (_regs)->sr &= ~0x2000; \
+ wrusp(_usp); \
+} while(0)
+
+#endif
+
/* Forward declaration, a strange C thing */
struct task_struct;
diff --git a/arch/m68k/include/asm/processor_no.h b/arch/m68k/include/asm/processor_no.h
deleted file mode 100644
index 7a1e0ba..0000000
--- a/arch/m68k/include/asm/processor_no.h
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
- * include/asm-m68knommu/processor.h
- *
- * Copyright (C) 1995 Hamish Macdonald
- */
-
-#ifndef __ASM_M68K_PROCESSOR_H
-#define __ASM_M68K_PROCESSOR_H
-
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
-#include <linux/compiler.h>
-#include <linux/threads.h>
-#include <asm/types.h>
-#include <asm/segment.h>
-#include <asm/fpu.h>
-#include <asm/ptrace.h>
-#include <asm/current.h>
-
-static inline unsigned long rdusp(void)
-{
-#ifdef CONFIG_COLDFIRE
- extern unsigned int sw_usp;
- return(sw_usp);
-#else
- unsigned long usp;
- __asm__ __volatile__("move %/usp,%0" : "=a" (usp));
- return usp;
-#endif
-}
-
-static inline void wrusp(unsigned long usp)
-{
-#ifdef CONFIG_COLDFIRE
- extern unsigned int sw_usp;
- sw_usp = usp;
-#else
- __asm__ __volatile__("move %0,%/usp" : : "a" (usp));
-#endif
-}
-
-/*
- * User space process size: 3.75GB. This is hardcoded into a few places,
- * so don't change it unless you know what you are doing.
- */
-#define TASK_SIZE (0xF0000000UL)
-
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's. We won't be using it
- */
-#define TASK_UNMAPPED_BASE 0
-
-/*
- * if you change this structure, you must change the code and offsets
- * in m68k/machasm.S
- */
-
-struct thread_struct {
- unsigned long ksp; /* kernel stack pointer */
- unsigned long usp; /* user stack pointer */
- unsigned short sr; /* saved status register */
- unsigned short fs; /* saved fs (sfc, dfc) */
- unsigned long crp[2]; /* cpu root pointer */
- unsigned long esp0; /* points to SR of stack frame */
- unsigned long fp[8*3];
- unsigned long fpcntl[3]; /* fp control regs */
- unsigned char fpstate[FPSTATESIZE]; /* floating point state */
-};
-
-#define INIT_THREAD { \
- .ksp = sizeof(init_stack) + (unsigned long) init_stack, \
- .sr = PS_S, \
- .fs = __KERNEL_DS, \
-}
-
-/*
- * Coldfire stacks need to be re-aligned on trap exit, conventional
- * 68k can handle this case cleanly.
- */
-#if defined(CONFIG_COLDFIRE)
-#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
-#else
-#define reformat(_regs) do { } while (0)
-#endif
-
-/*
- * Do necessary setup to start up a newly executed thread.
- *
- * pass the data segment into user programs if it exists,
- * it can't hurt anything as far as I can tell
- */
-#define start_thread(_regs, _pc, _usp) \
-do { \
- set_fs(USER_DS); /* reads from user space */ \
- (_regs)->pc = (_pc); \
- ((struct switch_stack *)(_regs))[-1].a6 = 0; \
- reformat(_regs); \
- if (current->mm) \
- (_regs)->d5 = current->mm->start_data; \
- (_regs)->sr &= ~0x2000; \
- wrusp(_usp); \
-} while(0)
-
-/* Forward declaration, a strange C thing */
-struct task_struct;
-
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
-/* Prepare to copy thread state - unlazy all lazy status */
-#define prepare_to_copy(tsk) do { } while (0)
-
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
-/*
- * Free current thread data structures etc..
- */
-static inline void exit_thread(void)
-{
-}
-
-unsigned long thread_saved_pc(struct task_struct *tsk);
-unsigned long get_wchan(struct task_struct *p);
-
-#define KSTK_EIP(tsk) \
- ({ \
- unsigned long eip = 0; \
- if ((tsk)->thread.esp0 > PAGE_SIZE && \
- (virt_addr_valid((tsk)->thread.esp0))) \
- eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
- eip; })
-#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
-
-#define cpu_relax() barrier()
-
-#endif
--
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