forked from Minki/linux
a0ab36689a
This introduces some much overdue chainsawing of the fixed PMB support. fixed PMB was introduced initially to work around the fact that dynamic PMB mode was relatively broken, though they were never intended to converge. The main areas where there are differences are whether the system is booted in 29-bit mode or 32-bit mode, and whether legacy mappings are to be preserved. Any system booting in true 32-bit mode will not care about legacy mappings, so these are roughly decoupled. Regardless of the entry point, PMB and 32BIT are directly related as far as the kernel is concerned, so we also switch back to having one select the other. With legacy mappings iterated through and applied in the initialization path it's now possible to finally merge the two implementations and permit dynamic remapping overtop of remaining entries regardless of whether boot mappings are crafted by hand or inherited from the boot loader. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
189 lines
5.6 KiB
C
189 lines
5.6 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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#include <linux/const.h>
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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_16KB)
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# define PAGE_SHIFT 14
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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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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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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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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
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#define HPAGE_SHIFT 29
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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 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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static inline unsigned long
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pages_do_alias(unsigned long addr1, unsigned long addr2)
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{
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return (addr1 ^ addr2) & shm_align_mask;
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}
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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extern void copy_page(void *to, void *from);
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struct page;
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struct vm_area_struct;
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extern void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma);
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE
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extern void clear_user_highpage(struct page *page, unsigned long vaddr);
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#define clear_user_highpage clear_user_highpage
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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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#elif defined(CONFIG_SUPERH32)
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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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#else
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typedef struct { unsigned long 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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typedef struct page *pgtable_t;
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#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
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#endif /* !__ASSEMBLY__ */
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/*
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* __MEMORY_START and SIZE are the physical addresses and size of RAM.
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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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/*
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* PAGE_OFFSET is the virtual address of the start of kernel address
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* space.
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*/
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#define PAGE_OFFSET CONFIG_PAGE_OFFSET
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/*
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* Virtual to physical RAM address translation.
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*
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* In 29 bit mode, the physical offset of RAM from address 0 is visible in
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* the kernel virtual address space, and thus we don't have to take
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* this into account when translating. However in 32 bit mode this offset
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* is not visible (it is part of the PMB mapping) and so needs to be
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* added or subtracted as required.
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*/
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#if defined(CONFIG_PMB_LEGACY)
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/* phys = virt - PAGE_OFFSET - (__MEMORY_START & 0xe0000000) */
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#define PMB_OFFSET (PAGE_OFFSET - PXSEG(__MEMORY_START))
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#define __pa(x) ((unsigned long)(x) - PMB_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x) + PMB_OFFSET))
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#elif defined(CONFIG_32BIT)
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
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#else
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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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#endif
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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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/*
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* PFN = physical frame number (ie PFN 0 == physical address 0)
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* PFN_START is the PFN of the first page of RAM. By defining this we
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* don't have struct page entries for the portion of address space
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* between physical address 0 and the start of RAM.
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*/
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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/getorder.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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* Some drivers need to perform DMA into kmalloc'ed buffers
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* and so we have to increase the kmalloc minalign for this.
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*/
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#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
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#ifdef CONFIG_SUPERH64
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/*
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* While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
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* happily generate {ld/st}.q pairs, requiring us to have 8-byte
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* alignment to avoid traps. The kmalloc alignment is gauranteed by
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* virtue of L1_CACHE_BYTES, requiring this to only be special cased
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* for slab caches.
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*/
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#define ARCH_SLAB_MINALIGN 8
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#endif
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#endif /* __ASM_SH_PAGE_H */
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