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author | Imre Kaloz <kaloz@openwrt.org> | 2012-05-01 07:00:17 +0000 |
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committer | Imre Kaloz <kaloz@openwrt.org> | 2012-05-01 07:00:17 +0000 |
commit | 9d2b3add2a5d7fce77952c77332101b53640a3a4 (patch) | |
tree | 7e3c3b52269e3c7564c6a88d67dc4ea6219b041c /target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c | |
parent | 280b7f6d6bcf49ee883d766e666e49394148beb1 (diff) | |
download | master-187ad058-9d2b3add2a5d7fce77952c77332101b53640a3a4.tar.gz master-187ad058-9d2b3add2a5d7fce77952c77332101b53640a3a4.tar.bz2 master-187ad058-9d2b3add2a5d7fce77952c77332101b53640a3a4.zip |
[coldfire]: switch to 2.6.38
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c')
-rw-r--r-- | target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c b/target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c deleted file mode 100644 index 8e9685086b..0000000000 --- a/target/linux/coldfire/files-2.6.31/arch/m68k/mm/cf-mmu.c +++ /dev/null @@ -1,317 +0,0 @@ -/* - * linux/arch/m68k/mm/cf-mmu.c - * - * 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. - * Copyright Freescale Semiconductor, Inc. 2008-2009 - * Jason Jin Jason.Jin@freescale.com - * Shrek Wu B16972@freescale.com - */ - -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/swap.h> -#include <linux/kernel.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/init.h> -#ifdef CONFIG_BLK_DEV_RAM -#include <linux/blkdev.h> -#endif -#include <linux/bootmem.h> - -#include <asm/setup.h> -#include <asm/uaccess.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/system.h> -#include <asm/machdep.h> -#include <asm/io.h> -#include <asm/mmu_context.h> -#include <asm/cf_pgalloc.h> - -#include <asm/coldfire.h> -#include <asm/tlbflush.h> - -#define KMAPAREA(x) ((x >= VMALLOC_START) && (x < KMAP_END)) - -#undef DEBUG - -#ifdef CONFIG_VDSO -unsigned long next_mmu_context; -#else -mm_context_t next_mmu_context; -#endif - -unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1]; - -atomic_t nr_free_contexts; -struct mm_struct *context_mm[LAST_CONTEXT+1]; -void steal_context(void); -#ifdef CONFIG_M5445X -void m68k_setup_node(int); -#endif -const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n"; - -extern unsigned long empty_bad_page_table; -extern unsigned long empty_bad_page; -extern unsigned long num_pages; -#ifdef CONFIG_M5445X -extern unsigned long availmem; -#endif -extern char __init_begin, __init_end; - -/* - * Free memory used for system initialization. - */ -void free_initmem(void) -{ -#if 0 - unsigned long addr; - unsigned long start = (unsigned long)&__init_begin; - unsigned long end = (unsigned long)&__init_end; - - printk(KERN_INFO "free_initmem: __init_begin = 0x%lx __init_end = 0x%lx\n", start, end); - - addr = (unsigned long)&__init_begin; - for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) { - /* not currently used */ - virt_to_page(addr)->flags &= ~(1 << PG_reserved); - init_page_count(virt_to_page(addr)); - free_page(addr); - totalram_pages++; - } -#endif -} - -/* - * Initialize the paging system. - */ -void __init paging_init(void) -{ - pgd_t * pg_dir; - pte_t * pg_table; - int i; - unsigned long address; - unsigned long next_pgtable; - unsigned long zones_size[MAX_NR_ZONES]; - unsigned long size; - enum zone_type zone; - - /* allocate zero page */ - empty_zero_page = (void *)alloc_bootmem_pages(PAGE_SIZE); - memset((void *)empty_zero_page, 0, PAGE_SIZE); - - /* zero kernel page directory */ - pg_dir = swapper_pg_dir; - memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); - /* - * setup page tables for PHYSRAM - */ - - /* starting loc in page directory */ - pg_dir += PAGE_OFFSET >> PGDIR_SHIFT; - - /* allocate page tables */ - size = num_pages * sizeof(pte_t); - size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1); - next_pgtable = (unsigned long)alloc_bootmem_pages(size); - address = PAGE_OFFSET; - while (address < (unsigned long)high_memory) { - /* setup page table in page directory */ - pg_table = (pte_t *)next_pgtable; - next_pgtable += PTRS_PER_PTE * sizeof(pte_t); - pgd_val(*pg_dir) = (unsigned long)pg_table; - pg_dir++; - - /* create PTEs in page table */ - 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; - } - } - - /* - * setup page tables for DMA area - */ - - /* starting loc in page directory */ - pg_dir = swapper_pg_dir; - pg_dir += CONFIG_DMA_BASE >> PGDIR_SHIFT; - - /* allocate page tables */ - size = (CONFIG_DMA_SIZE >> PAGE_SHIFT) * sizeof(pte_t); - size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1); - next_pgtable = (unsigned long)alloc_bootmem_pages(size); - address = CONFIG_DMA_BASE; - while (address < (CONFIG_DMA_BASE + CONFIG_DMA_SIZE)) { - /* setup page table in page directory */ - pg_table = (pte_t *)next_pgtable; - next_pgtable += PTRS_PER_PTE * sizeof(pte_t); - pgd_val(*pg_dir) = (unsigned long)pg_table; - pg_dir++; - - /* create PTEs in page table */ - for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) { - pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT); - if (address >= (CONFIG_DMA_BASE + CONFIG_DMA_SIZE)) - pte_val (pte) = 0; - - set_pte(pg_table, pte); - address += PAGE_SIZE; - } - } - - /* - * setup zones - */ - - current->mm = NULL; - - /* clear zones */ - for (zone = 0; zone < MAX_NR_ZONES; zone++) - zones_size[zone] = 0x0; - - zones_size[ZONE_DMA] = CONFIG_DMA_SIZE >> PAGE_SHIFT; - zones_size[ZONE_NORMAL] = (((unsigned long)high_memory - - PAGE_OFFSET) >> PAGE_SHIFT) - - zones_size[ZONE_DMA]; - - free_area_init(zones_size); -} -/* - * Handle a missed TLB - */ -int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word) -{ - struct mm_struct *mm; - pgd_t *pgd; - pmd_t *pmd; - pte_t *pte; - unsigned long mmuar; - int asid; - int flags; - - local_save_flags(flags); - local_irq_disable(); - - mmuar = ( dtlb ) ? regs->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 = cpu_context(mm) & 0xff; - if (!pte_dirty(*pte) && !KMAPAREA(mmuar)) - set_pte(pte, pte_wrprotect(*pte)); - - *MMUTR = (mmuar & PAGE_MASK) | (asid << CF_ASID_MMU_SHIFT) - | (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK ) >> CF_PAGE_MMUTR_SHIFT) - | MMUTR_V; - - *MMUDR = (pte_val(*pte) & PAGE_MASK) - | ((pte->pte) & CF_PAGE_MMUDR_MASK) - | MMUDR_SZ8K | MMUDR_X; - - if ( dtlb ) - *MMUOR = MMUOR_ACC | MMUOR_UAA; - else - *MMUOR = MMUOR_ITLB | MMUOR_ACC | MMUOR_UAA; - - asm("nop"); - -#ifdef DEBUG - printk("cf_tlb_miss: va=%lx, pa=%lx\n", (mmuar & PAGE_MASK), - (pte_val(*pte) & PAGE_MASK)); -#endif - local_irq_restore(flags); - return (0); -} - - -/* - * Context Management - * - * Based on arch/ppc/mmu_context.c - */ - -/* - * Initialize the context management system. - */ -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); -} |