#ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H #define _ASM_POWERPC_NOHASH_32_PGTABLE_H #include #ifndef __ASSEMBLY__ #include #include #include /* For sub-arch specific PPC_PIN_SIZE */ extern unsigned long ioremap_bot; #ifdef CONFIG_44x extern int icache_44x_need_flush; #endif #endif /* __ASSEMBLY__ */ /* * The normal case is that PTEs are 32-bits and we have a 1-page * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus * * For any >32-bit physical address platform, we can use the following * two level page table layout where the pgdir is 8KB and the MS 13 bits * are an index to the second level table. The combined pgdir/pmd first * level has 2048 entries and the second level has 512 64-bit PTE entries. * -Matt */ /* PGDIR_SHIFT determines what a top-level page table entry can map */ #define PGDIR_SHIFT (PAGE_SHIFT + PTE_SHIFT) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * entries per page directory level: our page-table tree is two-level, so * we don't really have any PMD directory. */ #ifndef __ASSEMBLY__ #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_SHIFT) #define PGD_TABLE_SIZE (sizeof(pgd_t) << (32 - PGDIR_SHIFT)) #endif /* __ASSEMBLY__ */ #define PTRS_PER_PTE (1 << PTE_SHIFT) #define PTRS_PER_PMD 1 #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) #define FIRST_USER_ADDRESS 0UL #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \ (unsigned long long)pte_val(e)) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) /* * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary * value (for now) on others, from where we can start layout kernel * virtual space that goes below PKMAP and FIXMAP */ #ifdef CONFIG_HIGHMEM #define KVIRT_TOP PKMAP_BASE #else #define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */ #endif /* * ioremap_bot starts at that address. Early ioremaps move down from there, * until mem_init() at which point this becomes the top of the vmalloc * and ioremap space */ #ifdef CONFIG_NOT_COHERENT_CACHE #define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK) #else #define IOREMAP_TOP KVIRT_TOP #endif /* * Just any arbitrary offset to the start of the vmalloc VM area: the * current 16MB value just means that there will be a 64MB "hole" after the * physical memory until the kernel virtual memory starts. That means that * any out-of-bounds memory accesses will hopefully be caught. * The vmalloc() routines leaves a hole of 4kB between each vmalloced * area for the same reason. ;) * * We no longer map larger than phys RAM with the BATs so we don't have * to worry about the VMALLOC_OFFSET causing problems. We do have to worry * about clashes between our early calls to ioremap() that start growing down * from IOREMAP_TOP being run into the VM area allocations (growing upwards * from VMALLOC_START). For this reason we have ioremap_bot to check when * we actually run into our mappings setup in the early boot with the VM * system. This really does become a problem for machines with good amounts * of RAM. -- Cort */ #define VMALLOC_OFFSET (0x1000000) /* 16M */ #ifdef PPC_PIN_SIZE #define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) #else #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) #endif #define VMALLOC_END ioremap_bot /* * Bits in a linux-style PTE. These match the bits in the * (hardware-defined) PowerPC PTE as closely as possible. */ #if defined(CONFIG_40x) #include #elif defined(CONFIG_44x) #include #elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT) #include #elif defined(CONFIG_FSL_BOOKE) #include #elif defined(CONFIG_8xx) #include #endif /* And here we include common definitions */ #include #ifndef __ASSEMBLY__ #define pte_clear(mm, addr, ptep) \ do { pte_update(ptep, ~_PAGE_HASHPTE, 0); } while (0) #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD) #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK) static inline void pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } /* * When flushing the tlb entry for a page, we also need to flush the hash * table entry. flush_hash_pages is assembler (for speed) in hashtable.S. */ extern int flush_hash_pages(unsigned context, unsigned long va, unsigned long pmdval, int count); /* Add an HPTE to the hash table */ extern void add_hash_page(unsigned context, unsigned long va, unsigned long pmdval); /* Flush an entry from the TLB/hash table */ extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long address); /* * PTE updates. This function is called whenever an existing * valid PTE is updated. This does -not- include set_pte_at() * which nowadays only sets a new PTE. * * Depending on the type of MMU, we may need to use atomic updates * and the PTE may be either 32 or 64 bit wide. In the later case, * when using atomic updates, only the low part of the PTE is * accessed atomically. * * In addition, on 44x, we also maintain a global flag indicating * that an executable user mapping was modified, which is needed * to properly flush the virtually tagged instruction cache of * those implementations. */ #ifndef CONFIG_PTE_64BIT static inline unsigned long pte_update(pte_t *p, unsigned long clr, unsigned long set) { #ifdef PTE_ATOMIC_UPDATES unsigned long old, tmp; __asm__ __volatile__("\ 1: lwarx %0,0,%3\n\ andc %1,%0,%4\n\ or %1,%1,%5\n" PPC405_ERR77(0,%3) " stwcx. %1,0,%3\n\ bne- 1b" : "=&r" (old), "=&r" (tmp), "=m" (*p) : "r" (p), "r" (clr), "r" (set), "m" (*p) : "cc" ); #else /* PTE_ATOMIC_UPDATES */ unsigned long old = pte_val(*p); *p = __pte((old & ~clr) | set); #endif /* !PTE_ATOMIC_UPDATES */ #ifdef CONFIG_44x if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) icache_44x_need_flush = 1; #endif return old; } #else /* CONFIG_PTE_64BIT */ static inline unsigned long long pte_update(pte_t *p, unsigned long clr, unsigned long set) { #ifdef PTE_ATOMIC_UPDATES unsigned long long old; unsigned long tmp; __asm__ __volatile__("\ 1: lwarx %L0,0,%4\n\ lwzx %0,0,%3\n\ andc %1,%L0,%5\n\ or %1,%1,%6\n" PPC405_ERR77(0,%3) " stwcx. %1,0,%4\n\ bne- 1b" : "=&r" (old), "=&r" (tmp), "=m" (*p) : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p) : "cc" ); #else /* PTE_ATOMIC_UPDATES */ unsigned long long old = pte_val(*p); *p = __pte((old & ~(unsigned long long)clr) | set); #endif /* !PTE_ATOMIC_UPDATES */ #ifdef CONFIG_44x if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) icache_44x_need_flush = 1; #endif return old; } #endif /* CONFIG_PTE_64BIT */ /* * 2.6 calls this without flushing the TLB entry; this is wrong * for our hash-based implementation, we fix that up here. */ #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep) { unsigned long old; old = pte_update(ptep, _PAGE_ACCESSED, 0); #if _PAGE_HASHPTE != 0 if (old & _PAGE_HASHPTE) { unsigned long ptephys = __pa(ptep) & PAGE_MASK; flush_hash_pages(context, addr, ptephys, 1); } #endif return (old & _PAGE_ACCESSED) != 0; } #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep) #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0)); } #define __HAVE_ARCH_PTEP_SET_WRPROTECT static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO); } static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { ptep_set_wrprotect(mm, addr, ptep); } static inline void __ptep_set_access_flags(struct mm_struct *mm, pte_t *ptep, pte_t entry, unsigned long address) { unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); unsigned long clr = ~pte_val(entry) & _PAGE_RO; pte_update(ptep, clr, set); } #define __HAVE_ARCH_PTE_SAME #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0) /* * Note that on Book E processors, the pmd contains the kernel virtual * (lowmem) address of the pte page. The physical address is less useful * because everything runs with translation enabled (even the TLB miss * handler). On everything else the pmd contains the physical address * of the pte page. -- paulus */ #ifndef CONFIG_BOOKE #define pmd_page_vaddr(pmd) \ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) #define pmd_page(pmd) \ pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) #else #define pmd_page_vaddr(pmd) \ ((unsigned long) (pmd_val(pmd) & PAGE_MASK)) #define pmd_page(pmd) \ pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT)) #endif /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(address) pgd_offset(&init_mm, address) /* to find an entry in a page-table-directory */ #define pgd_index(address) ((address) >> PGDIR_SHIFT) #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(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, addr) \ (pmd_bad(*(dir)) ? NULL : (pte_t *)pmd_page_vaddr(*(dir)) + \ pte_index(addr)) #define pte_offset_map(dir, addr) \ ((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr)) #define pte_unmap(pte) kunmap_atomic(pte) /* * Encode and decode a swap entry. * Note that the bits we use in a PTE for representing a swap entry * must not include the _PAGE_PRESENT bit or the _PAGE_HASHPTE bit (if used). * -- paulus */ #define __swp_type(entry) ((entry).val & 0x1f) #define __swp_offset(entry) ((entry).val >> 5) #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) #ifndef CONFIG_PPC_4K_PAGES void pgtable_cache_init(void); #else /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #endif extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp); #endif /* !__ASSEMBLY__ */ #endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */