Commit 002547b4 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] nommu: adjust headers for !MMU ARM systems 



Majorily based on Hyok Choi's patches, this fixes up the asm-arm
header files for mmuless systems.  Over and above Hyok's patches:

- nommu.h merged into mmu.h (it's only a structure)
- nommu_context.h is essentially the same as mmu_context.h, but
  without the MM switching code.

so there's no point having separate files.  Also, in memory.h,
there's no point #ifndef'ing PHYS_OFFSET and END_MEM - both
CONFIG_DRAM_BASE and CONFIG_DRAM_SIZE will always be set by the
configuration scripts.

Other files have minor formatting changes, but are essentially
the same.  Hyok's original patches were signed off thusly:

  Signed-off-by: default avatarHyok S. Choi <hyok.choi@samsung.com>

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 60b6cf68

include/asm-arm/bugs.h

+4 −0
Original line number Diff line number Diff line
@@ -10,8 +10,12 @@ 
#ifndef __ASM_BUGS_H

#define __ASM_BUGS_H



#ifdef CONFIG_MMU

extern void check_writebuffer_bugs(void);



#define check_bugs() check_writebuffer_bugs()

#else

#define check_bugs() do { } while (0)

#endif



#endif

include/asm-arm/domain.h

+7 −0
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ 
#define domain_val(dom,type)	((type) << (2*(dom)))



#ifndef __ASSEMBLY__



#ifdef CONFIG_MMU

#define set_domain(x)					\

	do {						\

	__asm__ __volatile__(				\
@@ -66,5 +68,10 @@ 
	set_domain(thread->cpu_domain);				\

	} while (0)



#else

#define set_domain(x)		do { } while (0)

#define modify_domain(dom,type)	do { } while (0)

#endif



#endif

#endif /* !__ASSEMBLY__ */

include/asm-arm/memory.h

+57 −18
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
 *  linux/include/asm-arm/memory.h

 *

 *  Copyright (C) 2000-2002 Russell King

 *  modification for nommu, Hyok S. Choi, 2004

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as
@@ -26,6 +27,8 @@ 
#include <asm/arch/memory.h>

#include <asm/sizes.h>



#ifdef CONFIG_MMU



#ifndef TASK_SIZE

/*

 * TASK_SIZE - the maximum size of a user space task.
@@ -47,6 +50,60 @@ 
#define PAGE_OFFSET		UL(0xc0000000)

#endif



/*

 * The module space lives between the addresses given by TASK_SIZE

 * and PAGE_OFFSET - it must be within 32MB of the kernel text.

 */

#define MODULE_END		(PAGE_OFFSET)

#define MODULE_START		(MODULE_END - 16*1048576)



#if TASK_SIZE > MODULE_START

#error Top of user space clashes with start of module space

#endif



/*

 * The XIP kernel gets mapped at the bottom of the module vm area.

 * Since we use sections to map it, this macro replaces the physical address

 * with its virtual address while keeping offset from the base section.

 */

#define XIP_VIRT_ADDR(physaddr)  (MODULE_START + ((physaddr) & 0x000fffff))



#else /* CONFIG_MMU */



/*

 * The limitation of user task size can grow up to the end of free ram region.

 * It is difficult to define and perhaps will never meet the original meaning

 * of this define that was meant to.

 * Fortunately, there is no reference for this in noMMU mode, for now.

 */

#ifndef TASK_SIZE

#define TASK_SIZE		(CONFIG_DRAM_SIZE)

#endif



#ifndef TASK_UNMAPPED_BASE

#define TASK_UNMAPPED_BASE	UL(0x00000000)

#endif



#ifndef PHYS_OFFSET

#define PHYS_OFFSET 		(CONFIG_DRAM_BASE)

#endif



#ifndef END_MEM

#define END_MEM     		(CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)

#endif



#ifndef PAGE_OFFSET

#define PAGE_OFFSET		(PHYS_OFFSET)

#endif



/*

 * The module can be at any place in ram in nommu mode.

 */

#define MODULE_END		(END_MEM)

#define MODULE_START		(PHYS_OFFSET)



#endif /* !CONFIG_MMU */



/*

 * Size of DMA-consistent memory region.  Must be multiple of 2M,

 * between 2MB and 14MB inclusive.
@@ -71,24 +128,6 @@ 
#define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)

#define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)



/*

 * The module space lives between the addresses given by TASK_SIZE

 * and PAGE_OFFSET - it must be within 32MB of the kernel text.

 */

#define MODULE_END	(PAGE_OFFSET)

#define MODULE_START	(MODULE_END - 16*1048576)



#if TASK_SIZE > MODULE_START

#error Top of user space clashes with start of module space

#endif



/*

 * The XIP kernel gets mapped at the bottom of the module vm area.

 * Since we use sections to map it, this macro replaces the physical address

 * with its virtual address while keeping offset from the base section.

 */

#define XIP_VIRT_ADDR(physaddr)  (MODULE_START + ((physaddr) & 0x000fffff))



#ifndef __ASSEMBLY__



/*

include/asm-arm/mmu.h

+16 −0
Original line number Diff line number Diff line 
#ifndef __ARM_MMU_H

#define __ARM_MMU_H



#ifdef CONFIG_MMU



typedef struct {

#if __LINUX_ARM_ARCH__ >= 6

	unsigned int id;
@@ -13,4 +15,18 @@ typedef struct { 
#define ASID(mm)	(0)

#endif



#else



/*

 * From nommu.h:

 *  Copyright (C) 2002, David McCullough <davidm@snapgear.com>

 *  modified for 2.6 by Hyok S. Choi <hyok.choi@samsung.com>

 */

typedef struct {

	struct vm_list_struct	*vmlist;

	unsigned long		end_brk;

} mm_context_t;



#endif



#endif

include/asm-arm/mmu_context.h

+2 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ static inline void 
switch_mm(struct mm_struct *prev, struct mm_struct *next,

	  struct task_struct *tsk)

{

#ifdef CONFIG_MMU

	unsigned int cpu = smp_processor_id();



	if (prev != next) {
@@ -91,6 +92,7 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next, 
		if (cache_is_vivt())

			cpu_clear(cpu, prev->cpu_vm_mask);

	}

#endif

}



#define deactivate_mm(tsk,mm)	do { } while (0)

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