forked from luck/tmp_suning_uos_patched
afca035745
As noted by David:
pte_page() is a macro defined as follows;
include/asm-sh/pgtable.h
#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)
include/asm-sh/page.h
#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
So as you can see the phys_to_page() macro doesn't wrap the 'phys'
parameter in parentheses so we end up with;
pte_val(x)&PTE_PHYS_MASK >> PAGE_SHIFT
Which is not what we wanted as '>>' has a higher precedence than bitwise
AND. I dug into the git repository and I believe this bug was added with
this commit (104b8deaa5);
2006-03-27 KAMEZAWA Hiroyuki [PATCH] unify pfn_to_page: sh pfn_to_page
-#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >>
PAGE_SHIFT))
-#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) +
__MEMORY_START)
+#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
+#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
Reported-by: David ADDISON <david.addison@st.com>
Reported-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
#ifndef __ASM_SH_PAGE_H
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#define __ASM_SH_PAGE_H
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/*
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* Copyright (C) 1999 Niibe Yutaka
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*/
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/*
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[ P0/U0 (virtual) ] 0x00000000 <------ User space
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[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
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[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
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[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
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[ P4 control ] 0xE0000000
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*/
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#ifdef __KERNEL__
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/* PAGE_SHIFT determines the page size */
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#if defined(CONFIG_PAGE_SIZE_4KB)
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# define PAGE_SHIFT 12
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#elif defined(CONFIG_PAGE_SIZE_8KB)
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# define PAGE_SHIFT 13
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#elif defined(CONFIG_PAGE_SIZE_64KB)
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# define PAGE_SHIFT 16
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#else
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# error "Bogus kernel page size?"
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#endif
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#ifdef __ASSEMBLY__
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PTE_MASK PAGE_MASK
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define HPAGE_SHIFT 16
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
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#define HPAGE_SHIFT 18
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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#define HPAGE_SHIFT 20
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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#define HPAGE_SHIFT 22
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
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#define HPAGE_SHIFT 26
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE-1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
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#endif
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#ifndef __ASSEMBLY__
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extern void (*clear_page)(void *to);
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extern void (*copy_page)(void *to, void *from);
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extern unsigned long shm_align_mask;
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extern unsigned long max_low_pfn, min_low_pfn;
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extern unsigned long memory_start, memory_end;
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#ifdef CONFIG_MMU
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extern void clear_page_slow(void *to);
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extern void copy_page_slow(void *to, void *from);
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#else
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extern void clear_page_nommu(void *to);
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extern void copy_page_nommu(void *to, void *from);
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#endif
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#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
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(defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
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struct page;
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extern void clear_user_page(void *to, unsigned long address, struct page *pg);
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extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
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extern void __clear_user_page(void *to, void *orig_to);
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extern void __copy_user_page(void *to, void *from, void *orig_to);
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#else
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#endif
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/*
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* These are used to make use of C type-checking..
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*/
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#ifdef CONFIG_X2TLB
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typedef struct { unsigned long pte_low, pte_high; } pte_t;
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typedef struct { unsigned long long pgprot; } pgprot_t;
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typedef struct { unsigned long long pgd; } pgd_t;
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#define pte_val(x) \
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((x).pte_low | ((unsigned long long)(x).pte_high << 32))
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#define __pte(x) \
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({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
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#else
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typedef struct { unsigned long pte_low; } pte_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pte_val(x) ((x).pte_low)
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#define __pte(x) ((pte_t) { (x) } )
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#endif
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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/*
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* IF YOU CHANGE THIS, PLEASE ALSO CHANGE
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*
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* arch/sh/kernel/vmlinux.lds.S
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*
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* which has the same constant encoded..
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*/
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#define __MEMORY_START CONFIG_MEMORY_START
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#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
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#define PAGE_OFFSET CONFIG_PAGE_OFFSET
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/* PFN start number, because of __MEMORY_START */
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#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
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#define ARCH_PFN_OFFSET (PFN_START)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
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#endif
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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/* vDSO support */
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#ifdef CONFIG_VSYSCALL
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#define __HAVE_ARCH_GATE_AREA
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#endif
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/*
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* Slub defaults to 8-byte alignment, we're only interested in 4.
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* Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
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*/
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#define ARCH_KMALLOC_MINALIGN 4
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#define ARCH_SLAB_MINALIGN 4
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_PAGE_H */
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