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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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b0f1e7962f
As sparse warns, without this struct page pointer subtraction is extremely expensive, and this is a pretty common operation in fast paths. With this define struct page becomes 64 bytes which makes for a simple subtract and shift, instead of a costly divide or reciprocol multiply. Signed-off-by: David S. Miller <davem@davemloft.net>
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
#ifndef _SPARC64_PAGE_H
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#define _SPARC64_PAGE_H
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#include <linux/const.h>
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#if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
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#define PAGE_SHIFT 13
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#elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
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#define PAGE_SHIFT 16
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#else
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#error No page size specified in kernel configuration
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#endif
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#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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/* Flushing for D-cache alias handling is only needed if
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* the page size is smaller than 16K.
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*/
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#if PAGE_SHIFT < 14
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#define DCACHE_ALIASING_POSSIBLE
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#endif
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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#define HPAGE_SHIFT 22
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
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#define HPAGE_SHIFT 19
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define HPAGE_SHIFT 16
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1UL))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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#ifndef __ASSEMBLY__
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#define WANT_PAGE_VIRTUAL
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extern void _clear_page(void *page);
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#define clear_page(X) _clear_page((void *)(X))
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struct page;
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extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
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#define copy_page(X,Y) memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
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extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
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/* Unlike sparc32, sparc64's parameter passing API is more
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* sane in that structures which as small enough are passed
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* in registers instead of on the stack. Thus, setting
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* STRICT_MM_TYPECHECKS does not generate worse code so
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* let's enable it to get the type checking.
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*/
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#define STRICT_MM_TYPECHECKS
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#ifdef STRICT_MM_TYPECHECKS
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/* These are used to make use of C type-checking.. */
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long iopte; } iopte_t;
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typedef struct { unsigned int pmd; } pmd_t;
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typedef struct { unsigned int pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define iopte_val(x) ((x).iopte)
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#define pmd_val(x) ((x).pmd)
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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 __pte(x) ((pte_t) { (x) } )
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#define __iopte(x) ((iopte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#else
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/* .. while these make it easier on the compiler */
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typedef unsigned long pte_t;
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typedef unsigned long iopte_t;
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typedef unsigned int pmd_t;
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typedef unsigned int pgd_t;
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typedef unsigned long pgprot_t;
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#define pte_val(x) (x)
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#define iopte_val(x) (x)
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#define pmd_val(x) (x)
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#define pgd_val(x) (x)
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#define pgprot_val(x) (x)
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#define __pte(x) (x)
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#define __iopte(x) (x)
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#define __pmd(x) (x)
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#define __pgd(x) (x)
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#define __pgprot(x) (x)
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#endif /* (STRICT_MM_TYPECHECKS) */
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typedef struct page *pgtable_t;
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#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \
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(_AC(0x0000000070000000,UL)) : \
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(_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
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#include <asm-generic/memory_model.h>
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#endif /* !(__ASSEMBLY__) */
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/* We used to stick this into a hard-coded global register (%g4)
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* but that does not make sense anymore.
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*/
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#define PAGE_OFFSET _AC(0xFFFFF80000000000,UL)
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#ifndef __ASSEMBLY__
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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 virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_to_phys __pa
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#define phys_to_virt __va
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#endif /* !(__ASSEMBLY__) */
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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/page.h>
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#endif /* _SPARC64_PAGE_H */
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