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OpenRISC: Memory management

Browse Source 
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Jonas Bonn
2011-06-04 11:06:11 +03:00
parent 4f246ba30e
commit 61e85e3675
15 changed files with 2279 additions and 0 deletions
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29
arch/openrisc/include/asm/cache.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_CACHE_H
#define __ASM_OPENRISC_CACHE_H
/* FIXME: How can we replace these with values from the CPU...
* they shouldn't be hard-coded!
*/
#define L1_CACHE_BYTES 16
#define L1_CACHE_SHIFT 4
#endif /* __ASM_OPENRISC_CACHE_H */

87
arch/openrisc/include/asm/fixmap.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_FIXMAP_H
#define __ASM_OPENRISC_FIXMAP_H
/* Why exactly do we need 2 empty pages between the top of the fixed
* addresses and the top of virtual memory? Something is using that
* memory space but not sure what right now... If you find it, leave
* a comment here.
*/
#define FIXADDR_TOP ((unsigned long) (-2*PAGE_SIZE))
#include <linux/kernel.h>
#include <asm/page.h>
/*
* On OpenRISC we use these special fixed_addresses for doing ioremap
* early in the boot process before memory initialization is complete.
* This is used, in particular, by the early serial console code.
*
* It's not really 'fixmap', per se, but fits loosely into the same
* paradigm.
*/
enum fixed_addresses {
/*
* FIX_IOREMAP entries are useful for mapping physical address
* space before ioremap() is useable, e.g. really early in boot
* before kmalloc() is working.
*/
#define FIX_N_IOREMAPS 32
FIX_IOREMAP_BEGIN,
FIX_IOREMAP_END = FIX_IOREMAP_BEGIN + FIX_N_IOREMAPS - 1,
__end_of_fixed_addresses
};
#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
/* FIXADDR_BOTTOM might be a better name here... */
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
/*
* 'index to address' translation. If anyone tries to use the idx
* directly without tranlation, we catch the bug with a NULL-deference
* kernel oops. Illegal ranges of incoming indices are caught too.
*/
static __always_inline unsigned long fix_to_virt(const unsigned int idx)
{
/*
* this branch gets completely eliminated after inlining,
* except when someone tries to use fixaddr indices in an
* illegal way. (such as mixing up address types or using
* out-of-range indices).
*
* If it doesn't get removed, the linker will complain
* loudly with a reasonably clear error message..
*/
if (idx >= __end_of_fixed_addresses)
BUG();
return __fix_to_virt(idx);
}
static inline unsigned long virt_to_fix(const unsigned long vaddr)
{
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
return __virt_to_fix(vaddr);
}
#endif

24
arch/openrisc/include/asm/memblock.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_MEMBLOCK_H
#define __ASM_OPENRISC_MEMBLOCK_H
/* empty */
#endif /* __ASM_OPENRISC_MEMBLOCK_H */

26
arch/openrisc/include/asm/mmu.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_MMU_H
#define __ASM_OPENRISC_MMU_H
#ifndef __ASSEMBLY__
typedef unsigned long mm_context_t;
#endif
#endif

43
arch/openrisc/include/asm/mmu_context.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_MMU_CONTEXT_H
#define __ASM_OPENRISC_MMU_CONTEXT_H
#include <asm-generic/mm_hooks.h>
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);
#define deactivate_mm(tsk, mm) do { } while (0)
#define activate_mm(prev, next) switch_mm((prev), (next), NULL)
/* current active pgd - this is similar to other processors pgd
* registers like cr3 on the i386
*/
extern volatile pgd_t *current_pgd; /* defined in arch/openrisc/mm/fault.c */
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
#endif

110
arch/openrisc/include/asm/page.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_PAGE_H
#define __ASM_OPENRISC_PAGE_H
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 13
#ifdef __ASSEMBLY__
#define PAGE_SIZE (1 << PAGE_SHIFT)
#else
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#endif
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PAGE_OFFSET 0xc0000000
#define KERNELBASE PAGE_OFFSET
/* This is not necessarily the right place for this, but it's needed by
* drivers/of/fdt.c
*/
#include <asm/setup.h>
#ifndef __ASSEMBLY__
#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
#define free_user_page(page, addr) free_page(addr)
#define clear_page(page) memset((page), 0, PAGE_SIZE)
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
#define clear_user_page(page, vaddr, pg) clear_page(page)
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
/*
* These are used to make use of C type-checking..
*/
typedef struct {
unsigned long pte;
} pte_t;
typedef struct {
unsigned long pgd;
} pgd_t;
typedef struct {
unsigned long pgprot;
} pgprot_t;
typedef struct page *pgtable_t;
#define pte_val(x) ((x).pte)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) })
#define __pgd(x) ((pgd_t) { (x) })
#define __pgprot(x) ((pgprot_t) { (x) })
extern unsigned long memory_start;
extern unsigned long memory_end;
#endif /* !__ASSEMBLY__ */
#ifndef __ASSEMBLY__
#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_to_page(addr) \
(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
#define page_to_virt(page) \
((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
#define pfn_valid(pfn) ((pfn) < max_mapnr)
#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
((void *)(kaddr) < (void *)memory_end))
#endif /* __ASSEMBLY__ */
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
#endif /* __ASM_OPENRISC_PAGE_H */

102
arch/openrisc/include/asm/pgalloc.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_PGALLOC_H
#define __ASM_OPENRISC_PGALLOC_H
#include <asm/page.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
extern int mem_init_done;
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
struct page *pte)
{
set_pmd(pmd, __pmd(_KERNPG_TABLE +
((unsigned long)page_to_pfn(pte) <<
(unsigned long) PAGE_SHIFT)));
}
/*
* Allocate and free page tables.
*/
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
if (ret) {
memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
memcpy(ret + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
return ret;
}
#if 0
/* FIXME: This seems to be the preferred style, but we are using
* current_pgd (from mm->pgd) to load kernel pages so we need it
* initialized. This needs to be looked into.
*/
extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return (pgd_t *)get_zeroed_page(GFP_KERNEL);
}
#endif
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
free_page((unsigned long)pgd);
}
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
static inline struct page *pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
struct page *pte;
pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
if (pte)
clear_page(page_address(pte));
return pte;
}
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
}
static inline void pte_free(struct mm_struct *mm, struct page *pte)
{
__free_page(pte);
}
#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
#define pmd_pgtable(pmd) pmd_page(pmd)
#define check_pgt_cache() do { } while (0)
#endif

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arch/openrisc/include/asm/pgtable.h Normal file
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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/* or32 pgtable.h - macros and functions to manipulate page tables
*
* Based on:
* include/asm-cris/pgtable.h
*/
#ifndef __ASM_OPENRISC_PGTABLE_H
#define __ASM_OPENRISC_PGTABLE_H
#include <asm-generic/pgtable-nopmd.h>
#ifndef __ASSEMBLY__
#include <asm/mmu.h>
#include <asm/fixmap.h>
/*
* The Linux memory management assumes a three-level page table setup. On
* or32, we use that, but "fold" the mid level into the top-level page
* table. Since the MMU TLB is software loaded through an interrupt, it
* supports any page table structure, so we could have used a three-level
* setup, but for the amounts of memory we normally use, a two-level is
* probably more efficient.
*
* This file contains the functions and defines necessary to modify and use
* the or32 page table tree.
*/
extern void paging_init(void);
/* Certain architectures need to do special things when pte's
* within a page table are directly modified. Thus, the following
* hook is made available.
*/
#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
/*
* (pmds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-2))
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/*
* entries per page directory level: we use a two-level, so
* we don't really have any PMD directory physically.
* pointers are 4 bytes so we can use the page size and
* divide it by 4 (shift by 2).
*/
#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-2))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-2))
/* calculate how many PGD entries a user-level program can use
* the first mappable virtual address is 0
* (TASK_SIZE is the maximum virtual address space)
*/
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
/*
* Kernels own virtual memory area.
*/
/*
* The size and location of the vmalloc area are chosen so that modules
* placed in this area aren't more than a 28-bit signed offset from any
* kernel functions that they may need. This greatly simplifies handling
* of the relocations for l.j and l.jal instructions as we don't need to
* introduce any trampolines for reaching "distant" code.
*
* 64 MB of vmalloc area is comparable to what's available on other arches.
*/
#define VMALLOC_START (PAGE_OFFSET-0x04000000)
#define VMALLOC_END (PAGE_OFFSET)
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
/* Define some higher level generic page attributes.
*
* If you change _PAGE_CI definition be sure to change it in
* io.h for ioremap_nocache() too.
*/
/*
* An OR32 PTE looks like this:
*
* | 31 ... 10 | 9 | 8 ... 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* Phys pg.num L PP Index D A WOM WBC CI CC
*
* L : link
* PPI: Page protection index
* D : Dirty
* A : Accessed
* WOM: Weakly ordered memory
* WBC: Write-back cache
* CI : Cache inhibit
* CC : Cache coherent
*
* The protection bits below should correspond to the layout of the actual
* PTE as per above
*/
#define _PAGE_CC 0x001 /* software: pte contains a translation */
#define _PAGE_CI 0x002 /* cache inhibit */
#define _PAGE_WBC 0x004 /* write back cache */
#define _PAGE_FILE 0x004 /* set: pagecache, unset: swap (when !PRESENT) */
#define _PAGE_WOM 0x008 /* weakly ordered memory */
#define _PAGE_A 0x010 /* accessed */
#define _PAGE_D 0x020 /* dirty */
#define _PAGE_URE 0x040 /* user read enable */
#define _PAGE_UWE 0x080 /* user write enable */
#define _PAGE_SRE 0x100 /* superuser read enable */
#define _PAGE_SWE 0x200 /* superuser write enable */
#define _PAGE_EXEC 0x400 /* software: page is executable */
#define _PAGE_U_SHARED 0x800 /* software: page is shared in user space */
/* 0x001 is cache coherency bit, which should always be set to
* 1 - for SMP (when we support it)
* 0 - otherwise
*
* we just reuse this bit in software for _PAGE_PRESENT and
* force it to 0 when loading it into TLB.
*/
#define _PAGE_PRESENT _PAGE_CC
#define _PAGE_USER _PAGE_URE
#define _PAGE_WRITE (_PAGE_UWE | _PAGE_SWE)
#define _PAGE_DIRTY _PAGE_D
#define _PAGE_ACCESSED _PAGE_A
#define _PAGE_NO_CACHE _PAGE_CI
#define _PAGE_SHARED _PAGE_U_SHARED
#define _PAGE_READ (_PAGE_URE | _PAGE_SRE)
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
#define _PAGE_ALL (_PAGE_PRESENT | _PAGE_ACCESSED)
#define _KERNPG_TABLE \
(_PAGE_BASE | _PAGE_SRE | _PAGE_SWE | _PAGE_ACCESSED | _PAGE_DIRTY)
#define PAGE_NONE __pgprot(_PAGE_ALL)
#define PAGE_READONLY __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE)
#define PAGE_READONLY_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_EXEC)
#define PAGE_SHARED \
__pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_UWE | _PAGE_SWE \
| _PAGE_SHARED)
#define PAGE_SHARED_X \
__pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_UWE | _PAGE_SWE \
| _PAGE_SHARED | _PAGE_EXEC)
#define PAGE_COPY __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE)
#define PAGE_COPY_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_EXEC)
#define PAGE_KERNEL \
__pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE \
| _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC)
#define PAGE_KERNEL_RO \
__pgprot(_PAGE_ALL | _PAGE_SRE \
| _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC)
#define PAGE_KERNEL_NOCACHE \
__pgprot(_PAGE_ALL | _PAGE_SRE | _PAGE_SWE \
| _PAGE_SHARED | _PAGE_DIRTY | _PAGE_EXEC | _PAGE_CI)
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY_X
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY_X
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY_X
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY_X
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY_X
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED_X
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY_X
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED_X
/* zero page used for uninitialized stuff */
extern unsigned long empty_zero_page[2048];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
/* number of bits that fit into a memory pointer */
#define BITS_PER_PTR (8*sizeof(unsigned long))
/* to align the pointer to a pointer address */
#define PTR_MASK (~(sizeof(void *)-1))
/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
/* 64-bit machines, beware! SRB. */
#define SIZEOF_PTR_LOG2 2
/* to find an entry in a page-table */
#define PAGE_PTR(address) \
((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
/* to set the page-dir */
#define SET_PAGE_DIR(tsk, pgdir)
#define pte_none(x) (!pte_val(x))
#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
#define pte_clear(mm, addr, xp) do { pte_val(*(xp)) = 0; } while (0)
#define pmd_none(x) (!pmd_val(x))
#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK)) != _KERNPG_TABLE)
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
#define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_special(pte_t pte) { return 0; }
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_WRITE);
return pte;
}
static inline pte_t pte_rdprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_READ);
return pte;
}
static inline pte_t pte_exprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_EXEC);
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_DIRTY);
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_ACCESSED);
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
return pte;
}
static inline pte_t pte_mkread(pte_t pte)
{
pte_val(pte) |= _PAGE_READ;
return pte;
}
static inline pte_t pte_mkexec(pte_t pte)
{
pte_val(pte) |= _PAGE_EXEC;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
return pte;
}
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
/* What actually goes as arguments to the various functions is less than
* obvious, but a rule of thumb is that struct page's goes as struct page *,
* really physical DRAM addresses are unsigned long's, and DRAM "virtual"
* addresses (the 0xc0xxxxxx's) goes as void *'s.
*/
static inline pte_t __mk_pte(void *page, pgprot_t pgprot)
{
pte_t pte;
/* the PTE needs a physical address */
pte_val(pte) = __pa(page) | pgprot_val(pgprot);
return pte;
}
#define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
#define mk_pte_phys(physpage, pgprot) \
({ \
pte_t __pte; \
\
pte_val(__pte) = (physpage) + pgprot_val(pgprot); \
__pte; \
})
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
/*
* pte_val refers to a page in the 0x0xxxxxxx physical DRAM interval
* __pte_page(pte_val) refers to the "virtual" DRAM interval
* pte_pagenr refers to the page-number counted starting from the virtual
* DRAM start
*/
static inline unsigned long __pte_page(pte_t pte)
{
/* the PTE contains a physical address */
return (unsigned long)__va(pte_val(pte) & PAGE_MASK);
}
#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
/* permanent address of a page */
#define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
#define pte_page(pte) (mem_map+pte_pagenr(pte))
/*
* only the pte's themselves need to point to physical DRAM (see above)
* the pagetable links are purely handled within the kernel SW and thus
* don't need the __pa and __va transformations.
*/
static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
{
pmd_val(*pmdp) = _KERNPG_TABLE | (unsigned long) ptep;
}
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
/* to find an entry in a page-table-directory. */
#define pgd_index(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define __pgd_offset(address) pgd_index(address)
#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
#define __pmd_offset(address) \
(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
/*
* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
*
* this macro returns the index of the entry in the pte page which would
* control the given virtual address
*/
#define __pte_offset(address) \
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, address) \
((pte_t *) pmd_page_kernel(*(dir)) + __pte_offset(address))
#define pte_offset_map(dir, address) \
((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
#define pte_offset_map_nested(dir, address) \
pte_offset_map(dir, address)
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)
#define pte_pfn(x) ((unsigned long)(((x).pte)) >> PAGE_SHIFT)
#define pfn_pte(pfn, prot) __pte((((pfn) << PAGE_SHIFT)) | pgprot_val(prot))
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte %p(%08lx).\n", \
__FILE__, __LINE__, &(e), pte_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %p(%08lx).\n", \
__FILE__, __LINE__, &(e), pgd_val(e))
extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* defined in head.S */
/*
* or32 doesn't have any external MMU info: the kernel page
* tables contain all the necessary information.
*
* Actually I am not sure on what this could be used for.
*/
static inline void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *pte)
{
}
/* __PHX__ FIXME, SWAP, this probably doesn't work */
/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
/* Since the PAGE_PRESENT bit is bit 4, we can use the bits above */
#define __swp_type(x) (((x).val >> 5) & 0x7f)
#define __swp_offset(x) ((x).val >> 12)
#define __swp_entry(type, offset) \
((swp_entry_t) { ((type) << 5) | ((offset) << 12) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
/* Encode and decode a nonlinear file mapping entry */
#define PTE_FILE_MAX_BITS 26
#define pte_to_pgoff(x) (pte_val(x) >> 6)
#define pgoff_to_pte(x) __pte(((x) << 6) | _PAGE_FILE)
#define kern_addr_valid(addr) (1)
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
#include <asm-generic/pgtable.h>
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
#define io_remap_page_range remap_page_range
typedef pte_t *pte_addr_t;
#endif /* __ASSEMBLY__ */
#endif /* __ASM_OPENRISC_PGTABLE_H */

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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_TLB_H__
#define __ASM_OPENRISC_TLB_H__
/*
* or32 doesn't need any special per-pte or
* per-vma handling..
*/
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
#define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
#include <linux/pagemap.h>
#include <asm-generic/tlb.h>
#endif /* __ASM_OPENRISC_TLB_H__ */

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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_TLBFLUSH_H
#define __ASM_OPENRISC_TLBFLUSH_H
#include <linux/mm.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/current.h>
#include <linux/sched.h>
/*
* - flush_tlb() flushes the current mm struct TLBs
* - flush_tlb_all() flushes all processes TLBs
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(mm, start, end) flushes a range of pages
*/
void flush_tlb_all(void);
void flush_tlb_mm(struct mm_struct *mm);
void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start,
unsigned long end);
static inline void flush_tlb(void)
{
flush_tlb_mm(current->mm);
}
static inline void flush_tlb_kernel_range(unsigned long start,
unsigned long end)
{
flush_tlb_range(NULL, start, end);
}
#endif /* __ASM_OPENRISC_TLBFLUSH_H */

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/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ASM_OPENRISC_UACCESS_H
#define __ASM_OPENRISC_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/errno.h>
#include <linux/thread_info.h>
#include <linux/prefetch.h>
#include <linux/string.h>
#include <linux/thread_info.h>
#include <asm/page.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
/* addr_limit is the maximum accessible address for the task. we misuse
* the KERNEL_DS and USER_DS values to both assign and compare the
* addr_limit values through the equally misnamed get/set_fs macros.
* (see above)
*/
#define KERNEL_DS (~0UL)
#define get_ds() (KERNEL_DS)
#define USER_DS (TASK_SIZE)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#define segment_eq(a, b) ((a) == (b))
/* Ensure that the range from addr to addr+size is all within the process'
* address space
*/
#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs()-size))
/* Ensure that addr is below task's addr_limit */
#define __addr_ok(addr) ((unsigned long) addr < get_fs())
#define access_ok(type, addr, size) \
__range_ok((unsigned long)addr, (unsigned long)size)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry {
unsigned long insn, fixup;
};
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table(unsigned long);
extern void sort_exception_table(void);
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the uglyness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*
* As we use the same address space for kernel and user data on the
* PowerPC, we can just do these as direct assignments. (Of course, the
* exception handling means that it's no longer "just"...)
*/
#define get_user(x, ptr) \
__get_user_check((x), (ptr), sizeof(*(ptr)))
#define put_user(x, ptr) \
__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
extern long __put_user_bad(void);
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err); \
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
long __pu_err = -EFAULT; \
__typeof__(*(ptr)) *__pu_addr = (ptr); \
if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
__put_user_size((x), __pu_addr, (size), __pu_err); \
__pu_err; \
})
#define __put_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
switch (size) { \
case 1: __put_user_asm(x, ptr, retval, "l.sb"); break; \
case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \
case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \
case 8: __put_user_asm2(x, ptr, retval); break; \
default: __put_user_bad(); \
} \
} while (0)
struct __large_struct {
unsigned long buf[100];
};
#define __m(x) (*(struct __large_struct *)(x))
/*
* We don't tell gcc that we are accessing memory, but this is OK
* because we do not write to any memory gcc knows about, so there
* are no aliasing issues.
*/
#define __put_user_asm(x, addr, err, op) \
__asm__ __volatile__( \
"1: "op" 0(%2),%1\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: l.addi %0,r0,%3\n" \
" l.j 2b\n" \
" l.nop\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,3b\n" \
".previous" \
: "=r"(err) \
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
#define __put_user_asm2(x, addr, err) \
__asm__ __volatile__( \
"1: l.sw 0(%2),%1\n" \
"2: l.sw 4(%2),%H1\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: l.addi %0,r0,%3\n" \
" l.j 3b\n" \
" l.nop\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,4b\n" \
" .long 2b,4b\n" \
".previous" \
: "=r"(err) \
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err, __gu_val; \
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x, ptr, size) \
({ \
long __gu_err = -EFAULT, __gu_val = 0; \
const __typeof__(*(ptr)) * __gu_addr = (ptr); \
if (access_ok(VERIFY_READ, __gu_addr, size)) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
extern long __get_user_bad(void);
#define __get_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
switch (size) { \
case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break; \
case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \
case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \
case 8: __get_user_asm2(x, ptr, retval); \
default: (x) = __get_user_bad(); \
} \
} while (0)
#define __get_user_asm(x, addr, err, op) \
__asm__ __volatile__( \
"1: "op" %1,0(%2)\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: l.addi %0,r0,%3\n" \
" l.addi %1,r0,0\n" \
" l.j 2b\n" \
" l.nop\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,3b\n" \
".previous" \
: "=r"(err), "=r"(x) \
: "r"(addr), "i"(-EFAULT), "0"(err))
#define __get_user_asm2(x, addr, err) \
__asm__ __volatile__( \
"1: l.lwz %1,0(%2)\n" \
"2: l.lwz %H1,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: l.addi %0,r0,%3\n" \
" l.addi %1,r0,0\n" \
" l.addi %H1,r0,0\n" \
" l.j 3b\n" \
" l.nop\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,4b\n" \
" .long 2b,4b\n" \
".previous" \
: "=r"(err), "=&r"(x) \
: "r"(addr), "i"(-EFAULT), "0"(err))
/* more complex routines */
extern unsigned long __must_check
__copy_tofrom_user(void *to, const void *from, unsigned long size);
#define __copy_from_user(to, from, size) \
__copy_tofrom_user(to, from, size)
#define __copy_to_user(to, from, size) \
__copy_tofrom_user(to, from, size)
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
static inline unsigned long
copy_from_user(void *to, const void *from, unsigned long n)
{
unsigned long over;
if (access_ok(VERIFY_READ, from, n))
return __copy_tofrom_user(to, from, n);
if ((unsigned long)from < TASK_SIZE) {
over = (unsigned long)from + n - TASK_SIZE;
return __copy_tofrom_user(to, from, n - over) + over;
}
return n;
}
static inline unsigned long
copy_to_user(void *to, const void *from, unsigned long n)
{
unsigned long over;
if (access_ok(VERIFY_WRITE, to, n))
return __copy_tofrom_user(to, from, n);
if ((unsigned long)to < TASK_SIZE) {
over = (unsigned long)to + n - TASK_SIZE;
return __copy_tofrom_user(to, from, n - over) + over;
}
return n;
}
extern unsigned long __clear_user(void *addr, unsigned long size);
static inline __must_check unsigned long
clear_user(void *addr, unsigned long size)
{
if (access_ok(VERIFY_WRITE, addr, size))
return __clear_user(addr, size);
if ((unsigned long)addr < TASK_SIZE) {
unsigned long over = (unsigned long)addr + size - TASK_SIZE;
return __clear_user(addr, size - over) + over;
}
return size;
}
extern int __strncpy_from_user(char *dst, const char *src, long count);
static inline long strncpy_from_user(char *dst, const char *src, long count)
{
if (access_ok(VERIFY_READ, src, 1))
return __strncpy_from_user(dst, src, count);
return -EFAULT;
}
/*
* Return the size of a string (including the ending 0)
*
* Return 0 for error
*/
extern int __strnlen_user(const char *str, long len, unsigned long top);
/*
* Returns the length of the string at str (including the null byte),
* or 0 if we hit a page we can't access,
* or something > len if we didn't find a null byte.
*
* The `top' parameter to __strnlen_user is to make sure that
* we can never overflow from the user area into kernel space.
*/
static inline long strnlen_user(const char __user *str, long len)
{
unsigned long top = (unsigned long)get_fs();
unsigned long res = 0;
if (__addr_ok(str))
res = __strnlen_user(str, len, top);
return res;
}
#define strlen_user(str) strnlen_user(str, TASK_SIZE-1)
#endif /* __ASM_OPENRISC_UACCESS_H */