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Diffstat (limited to 'include/asm-sh64/pgtable.h')
| -rw-r--r-- | include/asm-sh64/pgtable.h | 496 |
1 files changed, 0 insertions, 496 deletions
diff --git a/include/asm-sh64/pgtable.h b/include/asm-sh64/pgtable.h deleted file mode 100644 index 3488fe32e436..000000000000 --- a/include/asm-sh64/pgtable.h +++ /dev/null @@ -1,496 +0,0 @@ -#ifndef __ASM_SH64_PGTABLE_H -#define __ASM_SH64_PGTABLE_H - -#include <asm-generic/4level-fixup.h> - -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * include/asm-sh64/pgtable.h - * - * Copyright (C) 2000, 2001 Paolo Alberelli - * Copyright (C) 2003, 2004 Paul Mundt - * Copyright (C) 2003, 2004 Richard Curnow - * - * This file contains the functions and defines necessary to modify and use - * the SuperH page table tree. - */ - -#ifndef __ASSEMBLY__ -#include <asm/processor.h> -#include <asm/page.h> -#include <linux/threads.h> - -struct vm_area_struct; - -extern void paging_init(void); - -/* We provide our own get_unmapped_area to avoid cache synonym issue */ -#define HAVE_ARCH_UNMAPPED_AREA - -/* - * Basically we have the same two-level (which is the logical three level - * Linux page table layout folded) page tables as the i386. - */ - -/* - * ZERO_PAGE is a global shared page that is always zero: used - * for zero-mapped memory areas etc.. - */ -extern unsigned char empty_zero_page[PAGE_SIZE]; -#define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page)) - -#endif /* !__ASSEMBLY__ */ - -/* - * NEFF and NPHYS related defines. - * FIXME : These need to be model-dependent. For now this is OK, SH5-101 and SH5-103 - * implement 32 bits effective and 32 bits physical. But future implementations may - * extend beyond this. - */ -#define NEFF 32 -#define NEFF_SIGN (1LL << (NEFF - 1)) -#define NEFF_MASK (-1LL << NEFF) - -#define NPHYS 32 -#define NPHYS_SIGN (1LL << (NPHYS - 1)) -#define NPHYS_MASK (-1LL << NPHYS) - -/* Typically 2-level is sufficient up to 32 bits of virtual address space, beyond - that 3-level would be appropriate. */ -#if defined(CONFIG_SH64_PGTABLE_2_LEVEL) -/* For 4k pages, this contains 512 entries, i.e. 9 bits worth of address. */ -#define PTRS_PER_PTE ((1<<PAGE_SHIFT)/sizeof(unsigned long long)) -#define PTE_MAGNITUDE 3 /* sizeof(unsigned long long) magnit. */ -#define PTE_SHIFT PAGE_SHIFT -#define PTE_BITS (PAGE_SHIFT - PTE_MAGNITUDE) - -/* top level: PMD. */ -#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS) -#define PGD_BITS (NEFF - PGDIR_SHIFT) -#define PTRS_PER_PGD (1<<PGD_BITS) - -/* middle level: PMD. This doesn't do anything for the 2-level case. */ -#define PTRS_PER_PMD (1) - -#define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE-1)) -#define PMD_SHIFT PGDIR_SHIFT -#define PMD_SIZE PGDIR_SIZE -#define PMD_MASK PGDIR_MASK - -#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) -/* - * three-level asymmetric paging structure: PGD is top level. - * The asymmetry comes from 32-bit pointers and 64-bit PTEs. - */ -/* bottom level: PTE. It's 9 bits = 512 pointers */ -#define PTRS_PER_PTE ((1<<PAGE_SHIFT)/sizeof(unsigned long long)) -#define PTE_MAGNITUDE 3 /* sizeof(unsigned long long) magnit. */ -#define PTE_SHIFT PAGE_SHIFT -#define PTE_BITS (PAGE_SHIFT - PTE_MAGNITUDE) - -/* middle level: PMD. It's 10 bits = 1024 pointers */ -#define PTRS_PER_PMD ((1<<PAGE_SHIFT)/sizeof(unsigned long long *)) -#define PMD_MAGNITUDE 2 /* sizeof(unsigned long long *) magnit. */ -#define PMD_SHIFT (PTE_SHIFT + PTE_BITS) -#define PMD_BITS (PAGE_SHIFT - PMD_MAGNITUDE) - -/* top level: PMD. It's 1 bit = 2 pointers */ -#define PGDIR_SHIFT (PMD_SHIFT + PMD_BITS) -#define PGD_BITS (NEFF - PGDIR_SHIFT) -#define PTRS_PER_PGD (1<<PGD_BITS) - -#define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) -#define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE-1)) - -#else -#error "No defined number of page table levels" -#endif - -/* - * Error outputs. - */ -#define pte_ERROR(e) \ - printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e)) -#define pmd_ERROR(e) \ - printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) -#define pgd_ERROR(e) \ - printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) - -/* - * Table setting routines. Used within arch/mm only. - */ -#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval) -#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) - -static __inline__ void set_pte(pte_t *pteptr, pte_t pteval) -{ - unsigned long long x = ((unsigned long long) pteval.pte); - unsigned long long *xp = (unsigned long long *) pteptr; - /* - * Sign-extend based on NPHYS. - */ - *(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x; -} -#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) - -static __inline__ void pmd_set(pmd_t *pmdp,pte_t *ptep) -{ - pmd_val(*pmdp) = (unsigned long) ptep; -} - -/* - * PGD defines. Top level. - */ - -/* To find an entry in a generic PGD. */ -#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 PGD. */ -#define pgd_offset_k(address) pgd_offset(&init_mm, address) - -/* - * PGD level access routines. - * - * Note1: - * There's no need to use physical addresses since the tree walk is all - * in performed in software, until the PTE translation. - * - * Note 2: - * A PGD entry can be uninitialized (_PGD_UNUSED), generically bad, - * clear (_PGD_EMPTY), present. When present, lower 3 nibbles contain - * _KERNPG_TABLE. Being a kernel virtual pointer also bit 31 must - * be 1. Assuming an arbitrary clear value of bit 31 set to 0 and - * lower 3 nibbles set to 0xFFF (_PGD_EMPTY) any other value is a - * bad pgd that must be notified via printk(). - * - */ -#define _PGD_EMPTY 0x0 - -#if defined(CONFIG_SH64_PGTABLE_2_LEVEL) -static inline int pgd_none(pgd_t pgd) { return 0; } -static inline int pgd_bad(pgd_t pgd) { return 0; } -#define pgd_present(pgd) ((pgd_val(pgd) & _PAGE_PRESENT) ? 1 : 0) -#define pgd_clear(xx) do { } while(0) - -#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) -#define pgd_present(pgd_entry) (1) -#define pgd_none(pgd_entry) (pgd_val((pgd_entry)) == _PGD_EMPTY) -/* TODO: Think later about what a useful definition of 'bad' would be now. */ -#define pgd_bad(pgd_entry) (0) -#define pgd_clear(pgd_entry_p) (set_pgd((pgd_entry_p), __pgd(_PGD_EMPTY))) - -#endif - - -#define pgd_page_vaddr(pgd_entry) ((unsigned long) (pgd_val(pgd_entry) & PAGE_MASK)) -#define pgd_page(pgd) (virt_to_page(pgd_val(pgd))) - - -/* - * PMD defines. Middle level. - */ - -/* PGD to PMD dereferencing */ -#if defined(CONFIG_SH64_PGTABLE_2_LEVEL) -static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) -{ - return (pmd_t *) dir; -} -#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) -#define __pmd_offset(address) \ - (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) -#define pmd_offset(dir, addr) \ - ((pmd_t *) ((pgd_val(*(dir))) & PAGE_MASK) + __pmd_offset((addr))) -#endif - -/* - * PMD level access routines. Same notes as above. - */ -#define _PMD_EMPTY 0x0 -/* Either the PMD is empty or present, it's not paged out */ -#define pmd_present(pmd_entry) (pmd_val(pmd_entry) & _PAGE_PRESENT) -#define pmd_clear(pmd_entry_p) (set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY))) -#define pmd_none(pmd_entry) (pmd_val((pmd_entry)) == _PMD_EMPTY) -#define pmd_bad(pmd_entry) ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) - -#define pmd_page_vaddr(pmd_entry) \ - ((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK)) - -#define pmd_page(pmd) \ - (virt_to_page(pmd_val(pmd))) - -/* PMD to PTE dereferencing */ -#define pte_index(address) \ - ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) - -#define pte_offset_kernel(dir, addr) \ - ((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + pte_index((addr))) - -#define pte_offset_map(dir,addr) pte_offset_kernel(dir, addr) -#define pte_offset_map_nested(dir,addr) pte_offset_kernel(dir, addr) -#define pte_unmap(pte) do { } while (0) -#define pte_unmap_nested(pte) do { } while (0) - -/* Round it up ! */ -#define USER_PTRS_PER_PGD ((TASK_SIZE+PGDIR_SIZE-1)/PGDIR_SIZE) -#define FIRST_USER_ADDRESS 0 - -#ifndef __ASSEMBLY__ -#define VMALLOC_END 0xff000000 -#define VMALLOC_START 0xf0000000 -#define VMALLOC_VMADDR(x) ((unsigned long)(x)) - -#define IOBASE_VADDR 0xff000000 -#define IOBASE_END 0xffffffff - -/* - * PTEL coherent flags. - * See Chapter 17 ST50 CPU Core Volume 1, Architecture. - */ -/* The bits that are required in the SH-5 TLB are placed in the h/w-defined - positions, to avoid expensive bit shuffling on every refill. The remaining - bits are used for s/w purposes and masked out on each refill. - - Note, the PTE slots are used to hold data of type swp_entry_t when a page is - swapped out. Only the _PAGE_PRESENT flag is significant when the page is - swapped out, and it must be placed so that it doesn't overlap either the - type or offset fields of swp_entry_t. For x86, offset is at [31:8] and type - at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t. This - scheme doesn't map to SH-5 because bit [0] controls cacheability. So bit - [2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split - into 2 pieces. That is handled by SWP_ENTRY and SWP_TYPE below. */ -#define _PAGE_WT 0x001 /* CB0: if cacheable, 1->write-thru, 0->write-back */ -#define _PAGE_DEVICE 0x001 /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */ -#define _PAGE_CACHABLE 0x002 /* CB1: uncachable/cachable */ -#define _PAGE_PRESENT 0x004 /* software: page referenced */ -#define _PAGE_FILE 0x004 /* software: only when !present */ -#define _PAGE_SIZE0 0x008 /* SZ0-bit : size of page */ -#define _PAGE_SIZE1 0x010 /* SZ1-bit : size of page */ -#define _PAGE_SHARED 0x020 /* software: reflects PTEH's SH */ -#define _PAGE_READ 0x040 /* PR0-bit : read access allowed */ -#define _PAGE_EXECUTE 0x080 /* PR1-bit : execute access allowed */ -#define _PAGE_WRITE 0x100 /* PR2-bit : write access allowed */ -#define _PAGE_USER 0x200 /* PR3-bit : user space access allowed */ -#define _PAGE_DIRTY 0x400 /* software: page accessed in write */ -#define _PAGE_ACCESSED 0x800 /* software: page referenced */ - -/* Mask which drops software flags */ -#define _PAGE_FLAGS_HARDWARE_MASK 0xfffffffffffff3dbLL - -/* - * HugeTLB support - */ -#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) -#define _PAGE_SZHUGE (_PAGE_SIZE0) -#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) -#define _PAGE_SZHUGE (_PAGE_SIZE1) -#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB) -#define _PAGE_SZHUGE (_PAGE_SIZE0 | _PAGE_SIZE1) -#endif - -/* - * Default flags for a Kernel page. - * This is fundametally also SHARED because the main use of this define - * (other than for PGD/PMD entries) is for the VMALLOC pool which is - * contextless. - * - * _PAGE_EXECUTE is required for modules - * - */ -#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ - _PAGE_EXECUTE | \ - _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \ - _PAGE_SHARED) - -/* Default flags for a User page */ -#define _PAGE_TABLE (_KERNPG_TABLE | _PAGE_USER) - -#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) - -#define PAGE_NONE __pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED) -#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ - _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_USER | \ - _PAGE_SHARED) -/* We need to include PAGE_EXECUTE in PAGE_COPY because it is the default - * protection mode for the stack. */ -#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \ - _PAGE_ACCESSED | _PAGE_USER | _PAGE_EXECUTE) -#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \ - _PAGE_ACCESSED | _PAGE_USER) -#define PAGE_KERNEL __pgprot(_KERNPG_TABLE) - - -/* - * In ST50 we have full permissions (Read/Write/Execute/Shared). - * Just match'em all. These are for mmap(), therefore all at least - * User/Cachable/Present/Accessed. No point in making Fault on Write. - */ -#define __MMAP_COMMON (_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED) - /* sxwr */ -#define __P000 __pgprot(__MMAP_COMMON) -#define __P001 __pgprot(__MMAP_COMMON | _PAGE_READ) -#define __P010 __pgprot(__MMAP_COMMON) -#define __P011 __pgprot(__MMAP_COMMON | _PAGE_READ) -#define __P100 __pgprot(__MMAP_COMMON | _PAGE_EXECUTE) -#define __P101 __pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ) -#define __P110 __pgprot(__MMAP_COMMON | _PAGE_EXECUTE) -#define __P111 __pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ) - -#define __S000 __pgprot(__MMAP_COMMON | _PAGE_SHARED) -#define __S001 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ) -#define __S010 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_WRITE) -#define __S011 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ | _PAGE_WRITE) -#define __S100 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE) -#define __S101 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ) -#define __S110 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_WRITE) -#define __S111 __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ | _PAGE_WRITE) - -/* Make it a device mapping for maximum safety (e.g. for mapping device - registers into user-space via /dev/map). */ -#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE) -#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) - -/* - * Handling allocation failures during page table setup. - */ -extern void __handle_bad_pmd_kernel(pmd_t * pmd); -#define __handle_bad_pmd(x) __handle_bad_pmd_kernel(x) - -/* - * PTE level access routines. - * - * Note1: - * It's the tree walk leaf. This is physical address to be stored. - * - * Note 2: - * Regarding the choice of _PTE_EMPTY: - - We must choose a bit pattern that cannot be valid, whether or not the page - is present. bit[2]==1 => present, bit[2]==0 => swapped out. If swapped - out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is - left for us to select. If we force bit[7]==0 when swapped out, we could use - the combination bit[7,2]=2'b10 to indicate an empty PTE. Alternatively, if - we force bit[7]==1 when swapped out, we can use all zeroes to indicate - empty. This is convenient, because the page tables get cleared to zero - when they are allocated. - - */ -#define _PTE_EMPTY 0x0 -#define pte_present(x) (pte_val(x) & _PAGE_PRESENT) -#define pte_clear(mm,addr,xp) (set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY))) -#define pte_none(x) (pte_val(x) == _PTE_EMPTY) - -/* - * Some definitions to translate between mem_map, PTEs, and page - * addresses: - */ - -/* - * Given a PTE, return the index of the mem_map[] entry corresponding - * to the page frame the PTE. Get the absolute physical address, make - * a relative physical address and translate it to an index. - */ -#define pte_pagenr(x) (((unsigned long) (pte_val(x)) - \ - __MEMORY_START) >> PAGE_SHIFT) - -/* - * Given a PTE, return the "struct page *". - */ -#define pte_page(x) (mem_map + pte_pagenr(x)) - -/* - * Return number of (down rounded) MB corresponding to x pages. - */ -#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) - - -/* - * The following have defined behavior only work if pte_present() is true. - */ -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_write(pte_t pte){ return pte_val(pte) & _PAGE_WRITE; } - -static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; } -static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; } -static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; } -static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); return pte; } -static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; } -static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; } -static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; } - - -/* - * Conversion functions: convert a page and protection to a page entry. - * - * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) - */ -#define mk_pte(page,pgprot) \ -({ \ - pte_t __pte; \ - \ - set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) | \ - __MEMORY_START | pgprot_val((pgprot)))); \ - __pte; \ -}) - -/* - * This takes a (absolute) physical page address that is used - * by the remapping functions - */ -#define mk_pte_phys(physpage, pgprot) \ -({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; }) - -static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) -{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; } - -typedef pte_t *pte_addr_t; -#define pgtable_cache_init() do { } while (0) - -extern void update_mmu_cache(struct vm_area_struct * vma, - unsigned long address, pte_t pte); - -/* Encode and decode a swap entry */ -#define __swp_type(x) (((x).val & 3) + (((x).val >> 1) & 0x3c)) -#define __swp_offset(x) ((x).val >> 8) -#define __swp_entry(type, offset) ((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) }) -#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 29 -#define pte_to_pgoff(pte) (pte_val(pte)) -#define pgoff_to_pte(off) ((pte_t) { (off) | _PAGE_FILE }) - -/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ -#define PageSkip(page) (0) -#define kern_addr_valid(addr) (1) - -#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ - remap_pfn_range(vma, vaddr, pfn, size, prot) - -#endif /* !__ASSEMBLY__ */ - -/* - * No page table caches to initialise - */ -#define pgtable_cache_init() 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 pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) - -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; - -#include <asm-generic/pgtable.h> - -#endif /* __ASM_SH64_PGTABLE_H */ |