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392 lines
8.4 KiB
392 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/m68k/mm/kmap.c |
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* |
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* Copyright (C) 1997 Roman Hodek |
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* |
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* 10/01/99 cleaned up the code and changing to the same interface |
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* used by other architectures /Roman Zippel |
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*/ |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/vmalloc.h> |
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#include <asm/setup.h> |
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#include <asm/segment.h> |
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#include <asm/page.h> |
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#include <asm/io.h> |
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#include <asm/tlbflush.h> |
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#undef DEBUG |
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/* |
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* For 040/060 we can use the virtual memory area like other architectures, |
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* but for 020/030 we want to use early termination page descriptors and we |
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* can't mix this with normal page descriptors, so we have to copy that code |
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* (mm/vmalloc.c) and return appropriately aligned addresses. |
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*/ |
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#ifdef CPU_M68040_OR_M68060_ONLY |
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#define IO_SIZE PAGE_SIZE |
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static inline struct vm_struct *get_io_area(unsigned long size) |
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{ |
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return get_vm_area(size, VM_IOREMAP); |
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} |
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static inline void free_io_area(void *addr) |
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{ |
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vfree((void *)(PAGE_MASK & (unsigned long)addr)); |
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} |
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#else |
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#define IO_SIZE PMD_SIZE |
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static struct vm_struct *iolist; |
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/* |
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* __free_io_area unmaps nearly everything, so be careful |
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* Currently it doesn't free pointer/page tables anymore but this |
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* wasn't used anyway and might be added later. |
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*/ |
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static void __free_io_area(void *addr, unsigned long size) |
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{ |
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unsigned long virtaddr = (unsigned long)addr; |
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pgd_t *pgd_dir; |
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p4d_t *p4d_dir; |
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pud_t *pud_dir; |
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pmd_t *pmd_dir; |
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pte_t *pte_dir; |
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while ((long)size > 0) { |
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pgd_dir = pgd_offset_k(virtaddr); |
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p4d_dir = p4d_offset(pgd_dir, virtaddr); |
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pud_dir = pud_offset(p4d_dir, virtaddr); |
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if (pud_bad(*pud_dir)) { |
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printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir)); |
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pud_clear(pud_dir); |
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return; |
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} |
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pmd_dir = pmd_offset(pud_dir, virtaddr); |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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if (CPU_IS_020_OR_030) { |
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int pmd_type = pmd_val(*pmd_dir) & _DESCTYPE_MASK; |
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if (pmd_type == _PAGE_PRESENT) { |
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pmd_clear(pmd_dir); |
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virtaddr += PMD_SIZE; |
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size -= PMD_SIZE; |
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} else if (pmd_type == 0) |
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continue; |
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} |
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#endif |
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if (pmd_bad(*pmd_dir)) { |
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printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); |
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pmd_clear(pmd_dir); |
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return; |
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} |
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pte_dir = pte_offset_kernel(pmd_dir, virtaddr); |
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pte_val(*pte_dir) = 0; |
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virtaddr += PAGE_SIZE; |
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size -= PAGE_SIZE; |
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} |
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flush_tlb_all(); |
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} |
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static struct vm_struct *get_io_area(unsigned long size) |
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{ |
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unsigned long addr; |
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struct vm_struct **p, *tmp, *area; |
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area = kmalloc(sizeof(*area), GFP_KERNEL); |
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if (!area) |
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return NULL; |
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addr = KMAP_START; |
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for (p = &iolist; (tmp = *p) ; p = &tmp->next) { |
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if (size + addr < (unsigned long)tmp->addr) |
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break; |
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if (addr > KMAP_END-size) { |
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kfree(area); |
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return NULL; |
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} |
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addr = tmp->size + (unsigned long)tmp->addr; |
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} |
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area->addr = (void *)addr; |
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area->size = size + IO_SIZE; |
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area->next = *p; |
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*p = area; |
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return area; |
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} |
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static inline void free_io_area(void *addr) |
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{ |
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struct vm_struct **p, *tmp; |
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if (!addr) |
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return; |
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addr = (void *)((unsigned long)addr & -IO_SIZE); |
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for (p = &iolist ; (tmp = *p) ; p = &tmp->next) { |
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if (tmp->addr == addr) { |
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*p = tmp->next; |
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/* remove gap added in get_io_area() */ |
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__free_io_area(tmp->addr, tmp->size - IO_SIZE); |
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kfree(tmp); |
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return; |
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} |
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} |
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} |
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#endif |
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/* |
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* Map some physical address range into the kernel address space. |
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*/ |
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/* Rewritten by Andreas Schwab to remove all races. */ |
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void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag) |
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{ |
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struct vm_struct *area; |
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unsigned long virtaddr, retaddr; |
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long offset; |
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pgd_t *pgd_dir; |
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p4d_t *p4d_dir; |
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pud_t *pud_dir; |
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pmd_t *pmd_dir; |
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pte_t *pte_dir; |
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/* |
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* Don't allow mappings that wrap.. |
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*/ |
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if (!size || physaddr > (unsigned long)(-size)) |
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return NULL; |
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#ifdef CONFIG_AMIGA |
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if (MACH_IS_AMIGA) { |
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if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000) |
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&& (cacheflag == IOMAP_NOCACHE_SER)) |
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return (void __iomem *)physaddr; |
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} |
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#endif |
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#ifdef CONFIG_COLDFIRE |
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if (__cf_internalio(physaddr)) |
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return (void __iomem *) physaddr; |
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#endif |
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#ifdef DEBUG |
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printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag); |
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#endif |
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/* |
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* Mappings have to be aligned |
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*/ |
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offset = physaddr & (IO_SIZE - 1); |
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physaddr &= -IO_SIZE; |
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size = (size + offset + IO_SIZE - 1) & -IO_SIZE; |
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/* |
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* Ok, go for it.. |
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*/ |
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area = get_io_area(size); |
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if (!area) |
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return NULL; |
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virtaddr = (unsigned long)area->addr; |
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retaddr = virtaddr + offset; |
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#ifdef DEBUG |
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printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr); |
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#endif |
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/* |
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* add cache and table flags to physical address |
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*/ |
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if (CPU_IS_040_OR_060) { |
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physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 | |
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_PAGE_ACCESSED | _PAGE_DIRTY); |
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switch (cacheflag) { |
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case IOMAP_FULL_CACHING: |
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physaddr |= _PAGE_CACHE040; |
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break; |
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case IOMAP_NOCACHE_SER: |
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default: |
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physaddr |= _PAGE_NOCACHE_S; |
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break; |
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case IOMAP_NOCACHE_NONSER: |
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physaddr |= _PAGE_NOCACHE; |
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break; |
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case IOMAP_WRITETHROUGH: |
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physaddr |= _PAGE_CACHE040W; |
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break; |
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} |
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} else { |
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physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | |
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_PAGE_DIRTY | _PAGE_READWRITE); |
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switch (cacheflag) { |
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case IOMAP_NOCACHE_SER: |
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case IOMAP_NOCACHE_NONSER: |
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default: |
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physaddr |= _PAGE_NOCACHE030; |
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break; |
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case IOMAP_FULL_CACHING: |
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case IOMAP_WRITETHROUGH: |
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break; |
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} |
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} |
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while ((long)size > 0) { |
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#ifdef DEBUG |
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if (!(virtaddr & (PMD_SIZE-1))) |
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printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr); |
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#endif |
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pgd_dir = pgd_offset_k(virtaddr); |
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p4d_dir = p4d_offset(pgd_dir, virtaddr); |
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pud_dir = pud_offset(p4d_dir, virtaddr); |
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pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr); |
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if (!pmd_dir) { |
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printk("ioremap: no mem for pmd_dir\n"); |
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return NULL; |
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} |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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if (CPU_IS_020_OR_030) { |
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pmd_val(*pmd_dir) = physaddr; |
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physaddr += PMD_SIZE; |
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virtaddr += PMD_SIZE; |
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size -= PMD_SIZE; |
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} else |
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#endif |
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{ |
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pte_dir = pte_alloc_kernel(pmd_dir, virtaddr); |
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if (!pte_dir) { |
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printk("ioremap: no mem for pte_dir\n"); |
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return NULL; |
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} |
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pte_val(*pte_dir) = physaddr; |
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virtaddr += PAGE_SIZE; |
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physaddr += PAGE_SIZE; |
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size -= PAGE_SIZE; |
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} |
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} |
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#ifdef DEBUG |
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printk("\n"); |
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#endif |
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flush_tlb_all(); |
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return (void __iomem *)retaddr; |
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} |
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EXPORT_SYMBOL(__ioremap); |
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/* |
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* Unmap an ioremap()ed region again |
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*/ |
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void iounmap(void __iomem *addr) |
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{ |
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#ifdef CONFIG_AMIGA |
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if ((!MACH_IS_AMIGA) || |
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(((unsigned long)addr < 0x40000000) || |
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((unsigned long)addr > 0x60000000))) |
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free_io_area((__force void *)addr); |
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#else |
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#ifdef CONFIG_COLDFIRE |
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if (cf_internalio(addr)) |
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return; |
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#endif |
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free_io_area((__force void *)addr); |
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#endif |
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} |
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EXPORT_SYMBOL(iounmap); |
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/* |
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* Set new cache mode for some kernel address space. |
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* The caller must push data for that range itself, if such data may already |
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* be in the cache. |
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*/ |
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void kernel_set_cachemode(void *addr, unsigned long size, int cmode) |
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{ |
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unsigned long virtaddr = (unsigned long)addr; |
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pgd_t *pgd_dir; |
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p4d_t *p4d_dir; |
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pud_t *pud_dir; |
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pmd_t *pmd_dir; |
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pte_t *pte_dir; |
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if (CPU_IS_040_OR_060) { |
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switch (cmode) { |
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case IOMAP_FULL_CACHING: |
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cmode = _PAGE_CACHE040; |
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break; |
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case IOMAP_NOCACHE_SER: |
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default: |
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cmode = _PAGE_NOCACHE_S; |
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break; |
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case IOMAP_NOCACHE_NONSER: |
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cmode = _PAGE_NOCACHE; |
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break; |
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case IOMAP_WRITETHROUGH: |
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cmode = _PAGE_CACHE040W; |
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break; |
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} |
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} else { |
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switch (cmode) { |
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case IOMAP_NOCACHE_SER: |
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case IOMAP_NOCACHE_NONSER: |
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default: |
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cmode = _PAGE_NOCACHE030; |
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break; |
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case IOMAP_FULL_CACHING: |
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case IOMAP_WRITETHROUGH: |
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cmode = 0; |
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} |
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} |
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while ((long)size > 0) { |
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pgd_dir = pgd_offset_k(virtaddr); |
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p4d_dir = p4d_offset(pgd_dir, virtaddr); |
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pud_dir = pud_offset(p4d_dir, virtaddr); |
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if (pud_bad(*pud_dir)) { |
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printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir)); |
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pud_clear(pud_dir); |
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return; |
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} |
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pmd_dir = pmd_offset(pud_dir, virtaddr); |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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if (CPU_IS_020_OR_030) { |
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unsigned long pmd = pmd_val(*pmd_dir); |
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if ((pmd & _DESCTYPE_MASK) == _PAGE_PRESENT) { |
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*pmd_dir = __pmd((pmd & _CACHEMASK040) | cmode); |
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virtaddr += PMD_SIZE; |
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size -= PMD_SIZE; |
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continue; |
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} |
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} |
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#endif |
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if (pmd_bad(*pmd_dir)) { |
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printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); |
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pmd_clear(pmd_dir); |
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return; |
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} |
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pte_dir = pte_offset_kernel(pmd_dir, virtaddr); |
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pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode; |
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virtaddr += PAGE_SIZE; |
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size -= PAGE_SIZE; |
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} |
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flush_tlb_all(); |
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} |
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EXPORT_SYMBOL(kernel_set_cachemode);
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