diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-30 17:23:31 -0800 |
commit | 6de71484cf9561edb45224f659a9db38b6056d5e (patch) | |
tree | 588fe6f7c98147b805085503c863d371e2fa497e /arch/sparc/mm/generic_32.c | |
parent | 1dff81f20cd55ffa5a8ee984da70ce0b99d29606 (diff) | |
parent | e3c6d4ee545e427b55882d97d3b663c6411645fe (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6: (98 commits)
sparc: move select of ARCH_SUPPORTS_MSI
sparc: drop SUN_IO
sparc: unify sections.h
sparc: use .data.init_task section for init_thread_union
sparc: fix array overrun check in of_device_64.c
sparc: unify module.c
sparc64: prepare module_64.c for unification
sparc64: use bit neutral Elf symbols
sparc: unify module.h
sparc: introduce CONFIG_BITS
sparc: fix hardirq.h removal fallout
sparc64: do not export pus_fs_struct
sparc: use sparc64 version of scatterlist.h
sparc: Commonize memcmp assembler.
sparc: Unify strlen assembler.
sparc: Add asm/asm.h
sparc: Kill memcmp_32.S code which has been ifdef'd out for centuries.
sparc: replace for_each_cpu_mask_nr with for_each_cpu
sparc: fix sparse warnings in irq_32.c
sparc: add include guards to kernel.h
...
Diffstat (limited to 'arch/sparc/mm/generic_32.c')
-rw-r--r-- | arch/sparc/mm/generic_32.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/sparc/mm/generic_32.c b/arch/sparc/mm/generic_32.c new file mode 100644 index 00000000000..a289261da9f --- /dev/null +++ b/arch/sparc/mm/generic_32.c @@ -0,0 +1,97 @@ +/* + * generic.c: Generic Sparc mm routines that are not dependent upon + * MMU type but are Sparc specific. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/pagemap.h> + +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> + +/* Remap IO memory, the same way as remap_pfn_range(), but use + * the obio memory space. + * + * They use a pgprot that sets PAGE_IO and does not check the + * mem_map table as this is independent of normal memory. + */ +static inline void io_remap_pte_range(struct mm_struct *mm, pte_t * pte, unsigned long address, unsigned long size, + unsigned long offset, pgprot_t prot, int space) +{ + unsigned long end; + + address &= ~PMD_MASK; + end = address + size; + if (end > PMD_SIZE) + end = PMD_SIZE; + do { + set_pte_at(mm, address, pte, mk_pte_io(offset, prot, space)); + address += PAGE_SIZE; + offset += PAGE_SIZE; + pte++; + } while (address < end); +} + +static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size, + unsigned long offset, pgprot_t prot, int space) +{ + unsigned long end; + + address &= ~PGDIR_MASK; + end = address + size; + if (end > PGDIR_SIZE) + end = PGDIR_SIZE; + offset -= address; + do { + pte_t * pte = pte_alloc_map(mm, pmd, address); + if (!pte) + return -ENOMEM; + io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); + address = (address + PMD_SIZE) & PMD_MASK; + pmd++; + } while (address < end); + return 0; +} + +int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, + unsigned long pfn, unsigned long size, pgprot_t prot) +{ + int error = 0; + pgd_t * dir; + unsigned long beg = from; + unsigned long end = from + size; + struct mm_struct *mm = vma->vm_mm; + int space = GET_IOSPACE(pfn); + unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT; + + /* See comment in mm/memory.c remap_pfn_range */ + vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; + vma->vm_pgoff = (offset >> PAGE_SHIFT) | + ((unsigned long)space << 28UL); + + offset -= from; + dir = pgd_offset(mm, from); + flush_cache_range(vma, beg, end); + + while (from < end) { + pmd_t *pmd = pmd_alloc(mm, dir, from); + error = -ENOMEM; + if (!pmd) + break; + error = io_remap_pmd_range(mm, pmd, from, end - from, offset + from, prot, space); + if (error) + break; + from = (from + PGDIR_SIZE) & PGDIR_MASK; + dir++; + } + + flush_tlb_range(vma, beg, end); + return error; +} |