/* * This file contains the functions and defines necessary to modify and * use the SuperH page table tree. * * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2002 - 2005 Paul Mundt * * 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. */ #ifndef __ASM_SH_PGTABLE_H #define __ASM_SH_PGTABLE_H #include <asm-generic/pgtable-nopmd.h> #include <asm/page.h> #ifndef __ASSEMBLY__ #include <asm/addrspace.h> #include <asm/fixmap.h> /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) #endif /* !__ASSEMBLY__ */ /* * traditional two-level paging structure */ /* PTE bits */ #ifdef CONFIG_X2TLB # define PTE_MAGNITUDE 3 /* 64-bit PTEs on extended mode SH-X2 TLB */ #else # define PTE_MAGNITUDE 2 /* 32-bit PTEs */ #endif #define PTE_SHIFT PAGE_SHIFT #define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE) /* PGD bits */ #define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* Entries per level */ #define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE)) #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t)) #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) #define FIRST_USER_ADDRESS 0 #define PTE_PHYS_MASK (0x20000000 - PAGE_SIZE) #define VMALLOC_START (P3SEG) #define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) /* * Linux PTEL encoding. * * Hardware and software bit definitions for the PTEL value (see below for * notes on SH-X2 MMUs and 64-bit PTEs): * * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). * * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the * hardware PTEL value can't have the SH-bit set when MMUCR.IX is set, * which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT). * * In order to keep this relatively clean, do not use these for defining * SH-3 specific flags until all of the other unused bits have been * exhausted. * * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. * * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. * Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused. * * - Bits 31, 30, and 29 remain unused by everyone and can be used for future * software flags, although care must be taken to update _PAGE_CLEAR_FLAGS. * * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. * * SH-X2 MMUs and extended PTEs * * SH-X2 supports an extended mode TLB with split data arrays due to the * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and * SZ bit placeholders still exist in data array 1, but are implemented as * reserved bits, with the real logic existing in data array 2. * * The downside to this is that we can no longer fit everything in to a 32-bit * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus * side, this gives us quite a few spare bits to play with for future usage. */ /* Legacy and compat mode bits */ #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ #define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */ #define _PAGE_DIRTY 0x004 /* D-bit : page changed */ #define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ #define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ #define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ #define _PAGE_USER 0x040 /* PR1-bit : user space access allowed*/ #define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ #define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ #define _PAGE_PROTNONE 0x200 /* software: if not present */ #define _PAGE_ACCESSED 0x400 /* software: page referenced */ #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) /* Extended mode bits */ #define _PAGE_EXT_ESZ0 0x0010 /* ESZ0-bit: Size of page */ #define _PAGE_EXT_ESZ1 0x0020 /* ESZ1-bit: Size of page */ #define _PAGE_EXT_ESZ2 0x0040 /* ESZ2-bit: Size of page */ #define _PAGE_EXT_ESZ3 0x0080 /* ESZ3-bit: Size of page */ #define _PAGE_EXT_USER_EXEC 0x0100 /* EPR0-bit: User space executable */ #define _PAGE_EXT_USER_WRITE 0x0200 /* EPR1-bit: User space writable */ #define _PAGE_EXT_USER_READ 0x0400 /* EPR2-bit: User space readable */ #define _PAGE_EXT_KERN_EXEC 0x0800 /* EPR3-bit: Kernel space executable */ #define _PAGE_EXT_KERN_WRITE 0x1000 /* EPR4-bit: Kernel space writable */ #define _PAGE_EXT_KERN_READ 0x2000 /* EPR5-bit: Kernel space readable */ /* Wrapper for extended mode pgprot twiddling */ #define _PAGE_EXT(x) ((unsigned long long)(x) << 32) /* software: moves to PTEA.TC (Timing Control) */ #define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ #define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ /* software: moves to PTEA.SA[2:0] (Space Attributes) */ #define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ #define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ #define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ #define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ #define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ #define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ #define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ /* Mask which drops unused bits from the PTEL value */ #if defined(CONFIG_CPU_SH3) #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ _PAGE_FILE | _PAGE_SZ1 | \ _PAGE_HW_SHARED) #elif defined(CONFIG_X2TLB) /* Get rid of the legacy PR/SZ bits when using extended mode */ #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | \ _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK) #else #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) #endif #define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS)) /* Hardware flags, page size encoding */ #if defined(CONFIG_X2TLB) # if defined(CONFIG_PAGE_SIZE_4KB) # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ0) # elif defined(CONFIG_PAGE_SIZE_8KB) # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ1) # elif defined(CONFIG_PAGE_SIZE_64KB) # define _PAGE_FLAGS_HARD _PAGE_EXT(_PAGE_EXT_ESZ2) # endif #else # if defined(CONFIG_PAGE_SIZE_4KB) # define _PAGE_FLAGS_HARD _PAGE_SZ0 # elif defined(CONFIG_PAGE_SIZE_64KB) # define _PAGE_FLAGS_HARD _PAGE_SZ1 # endif #endif #if defined(CONFIG_X2TLB) # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2) # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2) # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2) # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ3) # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) # define _PAGE_SZHUGE (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3) # endif #else # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) # define _PAGE_SZHUGE (_PAGE_SZ1) # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) # define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) # endif #endif /* * Stub out _PAGE_SZHUGE if we don't have a good definition for it, * to make pte_mkhuge() happy. */ #ifndef _PAGE_SZHUGE # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) #endif #define _PAGE_CHG_MASK \ (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY) #ifndef __ASSEMBLY__ #if defined(CONFIG_X2TLB) /* SH-X2 TLB */ #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_USER_READ | \ _PAGE_EXT_USER_WRITE)) #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \ _PAGE_EXT_KERN_READ | \ _PAGE_EXT_USER_EXEC | \ _PAGE_EXT_USER_READ)) #define PAGE_COPY PAGE_EXECREAD #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_USER_READ)) #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_USER_WRITE)) #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \ _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_EXEC | \ _PAGE_EXT_USER_WRITE | \ _PAGE_EXT_USER_READ | \ _PAGE_EXT_USER_EXEC)) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ _PAGE_DIRTY | _PAGE_ACCESSED | \ _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_KERN_EXEC)) #define PAGE_KERNEL_NOCACHE \ __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ _PAGE_ACCESSED | _PAGE_HW_SHARED | \ _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_KERN_EXEC)) #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ _PAGE_DIRTY | _PAGE_ACCESSED | \ _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_EXEC)) #define PAGE_KERNEL_PCC(slot, type) \ __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ _PAGE_EXT(_PAGE_EXT_KERN_READ | \ _PAGE_EXT_KERN_WRITE | \ _PAGE_EXT_KERN_EXEC) \ (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ (type)) #elif defined(CONFIG_MMU) /* SH-X TLB */ #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ _PAGE_CACHABLE | _PAGE_ACCESSED | \ _PAGE_FLAGS_HARD) #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD) #define PAGE_EXECREAD PAGE_READONLY #define PAGE_RWX PAGE_SHARED #define PAGE_WRITEONLY PAGE_SHARED #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \ _PAGE_DIRTY | _PAGE_ACCESSED | \ _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) #define PAGE_KERNEL_NOCACHE \ __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ _PAGE_ACCESSED | _PAGE_HW_SHARED | \ _PAGE_FLAGS_HARD) #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \ _PAGE_DIRTY | _PAGE_ACCESSED | \ _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) #define PAGE_KERNEL_PCC(slot, type) \ __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \ _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \ (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \ (type)) #else /* no mmu */ #define PAGE_NONE __pgprot(0) #define PAGE_SHARED __pgprot(0) #define PAGE_COPY __pgprot(0) #define PAGE_EXECREAD __pgprot(0) #define PAGE_RWX __pgprot(0) #define PAGE_READONLY __pgprot(0) #define PAGE_WRITEONLY __pgprot(0) #define PAGE_KERNEL __pgprot(0) #define PAGE_KERNEL_NOCACHE __pgprot(0) #define PAGE_KERNEL_RO __pgprot(0) #define PAGE_KERNEL_PCC __pgprot(0) #endif #endif /* __ASSEMBLY__ */ /* * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page * protection for execute, and considers it the same as a read. Also, write * permission implies read permission. This is the closest we can get.. * * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme, * not only supporting separate execute, read, and write bits, but having * completely separate permission bits for user and kernel space. */ /*xwr*/ #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY #define __P011 PAGE_COPY #define __P100 PAGE_EXECREAD #define __P101 PAGE_EXECREAD #define __P110 PAGE_COPY #define __P111 PAGE_COPY #define __S000 PAGE_NONE #define __S001 PAGE_READONLY #define __S010 PAGE_WRITEONLY #define __S011 PAGE_SHARED #define __S100 PAGE_EXECREAD #define __S101 PAGE_EXECREAD #define __S110 PAGE_RWX #define __S111 PAGE_RWX #ifndef __ASSEMBLY__ /* * Certain architectures need to do special things when PTEs * within a page table are directly modified. Thus, the following * hook is made available. */ #ifdef CONFIG_X2TLB static inline void set_pte(pte_t *ptep, pte_t pte) { ptep->pte_high = pte.pte_high; smp_wmb(); ptep->pte_low = pte.pte_low; } #else #define set_pte(pteptr, pteval) (*(pteptr) = pteval) #endif #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 pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) #define pfn_pte(pfn, prot) \ __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pfn_pmd(pfn, prot) \ __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pte_none(x) (!pte_val(x)) #define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) #define pmd_none(x) (!pmd_val(x)) #define pmd_present(x) (pmd_val(x)) #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) #define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK) #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) #define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK) /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ #define pte_not_present(pte) (!((pte).pte_low & _PAGE_PRESENT)) #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) #ifdef CONFIG_X2TLB #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) #else #define pte_write(pte) ((pte).pte_low & _PAGE_RW) #endif #define PTE_BIT_FUNC(h,fn,op) \ static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; } #ifdef CONFIG_X2TLB /* * We cheat a bit in the SH-X2 TLB case. As the permission bits are * individually toggled (and user permissions are entirely decoupled from * kernel permissions), we attempt to couple them a bit more sanely here. */ PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE); PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE); PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE); #else PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW); PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW); PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE); #endif PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); /* * Macro and implementation to make a page protection as uncachable. */ #define pgprot_writecombine(prot) \ __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) #define pgprot_noncached pgprot_writecombine /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. * * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) */ #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte.pte_low &= _PAGE_CHG_MASK; pte.pte_low |= pgprot_val(newprot); #ifdef CONFIG_X2TLB pte.pte_high |= pgprot_val(newprot) >> 32; #endif return pte; } #define pmd_page_vaddr(pmd) ((unsigned long)pmd_val(pmd)) #define pmd_page(pmd) (virt_to_page(pmd_val(pmd))) /* to find an entry in a page-table-directory. */ #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) #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) /* Find an entry in the third-level page table.. */ #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) #define pte_offset_kernel(dir, address) \ ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) #define pte_offset_map(dir, address) pte_offset_kernel(dir, address) #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) #define pte_unmap(pte) do { } while (0) #define pte_unmap_nested(pte) do { } while (0) #ifdef CONFIG_X2TLB #define pte_ERROR(e) \ printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \ &(e), (e).pte_high, (e).pte_low) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) #else #define pte_ERROR(e) \ printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) #endif struct vm_area_struct; extern void update_mmu_cache(struct vm_area_struct * vma, unsigned long address, pte_t pte); /* * Encode and de-code a swap entry * * Constraints: * _PAGE_FILE at bit 0 * _PAGE_PRESENT at bit 8 * _PAGE_PROTNONE at bit 9 * * For the normal case, we encode the swap type into bits 0:7 and the * swap offset into bits 10:30. For the 64-bit PTE case, we keep the * preserved bits in the low 32-bits and use the upper 32 as the swap * offset (along with a 5-bit type), following the same approach as x86 * PAE. This keeps the logic quite simple, and allows for a full 32 * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with * in the pte_low case. * * As is evident by the Alpha code, if we ever get a 64-bit unsigned * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes * much cleaner.. * * NOTE: We should set ZEROs at the position of _PAGE_PRESENT * and _PAGE_PROTNONE bits */ #ifdef CONFIG_X2TLB #define __swp_type(x) ((x).val & 0x1f) #define __swp_offset(x) ((x).val >> 5) #define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) /* * Encode and decode a nonlinear file mapping entry */ #define pte_to_pgoff(pte) ((pte).pte_high) #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) #define PTE_FILE_MAX_BITS 32 #else #define __swp_type(x) ((x).val & 0xff) #define __swp_offset(x) ((x).val >> 10) #define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) /* * Encode and decode a nonlinear file mapping entry */ #define PTE_FILE_MAX_BITS 29 #define pte_to_pgoff(pte) (pte_val(pte) >> 1) #define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) #endif typedef pte_t *pte_addr_t; #define kern_addr_valid(addr) (1) #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) struct mm_struct; /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #ifndef CONFIG_MMU extern unsigned int kobjsize(const void *objp); #endif /* !CONFIG_MMU */ #if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \ defined(CONFIG_SH7705_CACHE_32KB)) #define __HAVE_ARCH_PTEP_GET_AND_CLEAR extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); #endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern void paging_init(void); #include <asm-generic/pgtable.h> #endif /* !__ASSEMBLY__ */ #endif /* __ASM_SH_PAGE_H */