diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/mm/mcfmmu.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/mm/mcfmmu.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/mm/mcfmmu.c b/ANDROID_3.4.5/arch/m68k/mm/mcfmmu.c deleted file mode 100644 index 875b800e..00000000 --- a/ANDROID_3.4.5/arch/m68k/mm/mcfmmu.c +++ /dev/null @@ -1,199 +0,0 @@ -/* - * Based upon linux/arch/m68k/mm/sun3mmu.c - * Based upon linux/arch/ppc/mm/mmu_context.c - * - * Implementations of mm routines specific to the Coldfire MMU. - * - * Copyright (c) 2008 Freescale Semiconductor, Inc. - */ - -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/mm.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/bootmem.h> - -#include <asm/setup.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/mmu_context.h> -#include <asm/mcf_pgalloc.h> -#include <asm/tlbflush.h> - -#define KMAPAREA(x) ((x >= VMALLOC_START) && (x < KMAP_END)) - -mm_context_t next_mmu_context; -unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1]; -atomic_t nr_free_contexts; -struct mm_struct *context_mm[LAST_CONTEXT+1]; -extern unsigned long num_pages; - -void free_initmem(void) -{ -} - -/* - * ColdFire paging_init derived from sun3. - */ -void __init paging_init(void) -{ - pgd_t *pg_dir; - pte_t *pg_table; - unsigned long address, size; - unsigned long next_pgtable, bootmem_end; - unsigned long zones_size[MAX_NR_ZONES]; - enum zone_type zone; - int i; - - empty_zero_page = (void *) alloc_bootmem_pages(PAGE_SIZE); - memset((void *) empty_zero_page, 0, PAGE_SIZE); - - pg_dir = swapper_pg_dir; - memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); - - size = num_pages * sizeof(pte_t); - size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1); - next_pgtable = (unsigned long) alloc_bootmem_pages(size); - - bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK; - pg_dir += PAGE_OFFSET >> PGDIR_SHIFT; - - address = PAGE_OFFSET; - while (address < (unsigned long)high_memory) { - pg_table = (pte_t *) next_pgtable; - next_pgtable += PTRS_PER_PTE * sizeof(pte_t); - pgd_val(*pg_dir) = (unsigned long) pg_table; - pg_dir++; - - /* now change pg_table to kernel virtual addresses */ - for (i = 0; i < PTRS_PER_PTE; ++i, ++pg_table) { - pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT); - if (address >= (unsigned long) high_memory) - pte_val(pte) = 0; - - set_pte(pg_table, pte); - address += PAGE_SIZE; - } - } - - current->mm = NULL; - - for (zone = 0; zone < MAX_NR_ZONES; zone++) - zones_size[zone] = 0x0; - zones_size[ZONE_DMA] = num_pages; - free_area_init(zones_size); -} - -int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word) -{ - unsigned long flags, mmuar, mmutr; - struct mm_struct *mm; - pgd_t *pgd; - pmd_t *pmd; - pte_t *pte; - int asid; - - local_irq_save(flags); - - mmuar = (dtlb) ? mmu_read(MMUAR) : - regs->pc + (extension_word * sizeof(long)); - - mm = (!user_mode(regs) && KMAPAREA(mmuar)) ? &init_mm : current->mm; - if (!mm) { - local_irq_restore(flags); - return -1; - } - - pgd = pgd_offset(mm, mmuar); - if (pgd_none(*pgd)) { - local_irq_restore(flags); - return -1; - } - - pmd = pmd_offset(pgd, mmuar); - if (pmd_none(*pmd)) { - local_irq_restore(flags); - return -1; - } - - pte = (KMAPAREA(mmuar)) ? pte_offset_kernel(pmd, mmuar) - : pte_offset_map(pmd, mmuar); - if (pte_none(*pte) || !pte_present(*pte)) { - local_irq_restore(flags); - return -1; - } - - if (write) { - if (!pte_write(*pte)) { - local_irq_restore(flags); - return -1; - } - set_pte(pte, pte_mkdirty(*pte)); - } - - set_pte(pte, pte_mkyoung(*pte)); - asid = mm->context & 0xff; - if (!pte_dirty(*pte) && !KMAPAREA(mmuar)) - set_pte(pte, pte_wrprotect(*pte)); - - mmutr = (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) | MMUTR_V; - if ((mmuar < TASK_UNMAPPED_BASE) || (mmuar >= TASK_SIZE)) - mmutr |= (pte->pte & CF_PAGE_MMUTR_MASK) >> CF_PAGE_MMUTR_SHIFT; - mmu_write(MMUTR, mmutr); - - mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) | - ((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X); - - if (dtlb) - mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA); - else - mmu_write(MMUOR, MMUOR_ITLB | MMUOR_ACC | MMUOR_UAA); - - local_irq_restore(flags); - return 0; -} - -/* - * Initialize the context management stuff. - * The following was taken from arch/ppc/mmu_context.c - */ -void __init mmu_context_init(void) -{ - /* - * Some processors have too few contexts to reserve one for - * init_mm, and require using context 0 for a normal task. - * Other processors reserve the use of context zero for the kernel. - * This code assumes FIRST_CONTEXT < 32. - */ - context_map[0] = (1 << FIRST_CONTEXT) - 1; - next_mmu_context = FIRST_CONTEXT; - atomic_set(&nr_free_contexts, LAST_CONTEXT - FIRST_CONTEXT + 1); -} - -/* - * Steal a context from a task that has one at the moment. - * This is only used on 8xx and 4xx and we presently assume that - * they don't do SMP. If they do then thicfpgalloc.hs will have to check - * whether the MM we steal is in use. - * We also assume that this is only used on systems that don't - * use an MMU hash table - this is true for 8xx and 4xx. - * This isn't an LRU system, it just frees up each context in - * turn (sort-of pseudo-random replacement :). This would be the - * place to implement an LRU scheme if anyone was motivated to do it. - * -- paulus - */ -void steal_context(void) -{ - struct mm_struct *mm; - /* - * free up context `next_mmu_context' - * if we shouldn't free context 0, don't... - */ - if (next_mmu_context < FIRST_CONTEXT) - next_mmu_context = FIRST_CONTEXT; - mm = context_mm[next_mmu_context]; - flush_tlb_mm(mm); - destroy_context(mm); -} - |