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161 lines
3.4 KiB
161 lines
3.4 KiB
/* |
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* linux/arch/m68k/mm/sun3kmap.c |
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* |
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* Copyright (C) 2002 Sam Creasey <[email protected]> |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/vmalloc.h> |
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#include <asm/page.h> |
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#include <asm/io.h> |
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#include <asm/sun3mmu.h> |
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#undef SUN3_KMAP_DEBUG |
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#ifdef SUN3_KMAP_DEBUG |
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extern void print_pte_vaddr(unsigned long vaddr); |
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#endif |
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extern void mmu_emu_map_pmeg (int context, int vaddr); |
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static inline void do_page_mapin(unsigned long phys, unsigned long virt, |
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unsigned long type) |
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{ |
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unsigned long pte; |
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pte_t ptep; |
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ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL); |
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pte = pte_val(ptep); |
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pte |= type; |
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sun3_put_pte(virt, pte); |
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#ifdef SUN3_KMAP_DEBUG |
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pr_info("mapin:"); |
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print_pte_vaddr(virt); |
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#endif |
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} |
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static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt, |
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unsigned long type, int pages) |
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{ |
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if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG) |
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mmu_emu_map_pmeg(sun3_get_context(), virt); |
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while(pages) { |
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do_page_mapin(phys, virt, type); |
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phys += PAGE_SIZE; |
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virt += PAGE_SIZE; |
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pages--; |
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} |
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} |
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void __iomem *sun3_ioremap(unsigned long phys, unsigned long size, |
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unsigned long type) |
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{ |
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struct vm_struct *area; |
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unsigned long offset, virt, ret; |
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int pages; |
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if(!size) |
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return NULL; |
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/* page align */ |
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offset = phys & (PAGE_SIZE-1); |
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phys &= ~(PAGE_SIZE-1); |
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size += offset; |
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size = PAGE_ALIGN(size); |
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if((area = get_vm_area(size, VM_IOREMAP)) == NULL) |
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return NULL; |
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#ifdef SUN3_KMAP_DEBUG |
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pr_info("ioremap: got virt %p size %lx(%lx)\n", area->addr, size, |
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area->size); |
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#endif |
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pages = size / PAGE_SIZE; |
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virt = (unsigned long)area->addr; |
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ret = virt + offset; |
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while(pages) { |
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int seg_pages; |
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seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE; |
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if(seg_pages > pages) |
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seg_pages = pages; |
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do_pmeg_mapin(phys, virt, type, seg_pages); |
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pages -= seg_pages; |
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phys += seg_pages * PAGE_SIZE; |
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virt += seg_pages * PAGE_SIZE; |
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} |
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return (void __iomem *)ret; |
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} |
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EXPORT_SYMBOL(sun3_ioremap); |
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void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache) |
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{ |
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return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO); |
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} |
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EXPORT_SYMBOL(__ioremap); |
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void iounmap(void __iomem *addr) |
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{ |
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vfree((void *)(PAGE_MASK & (unsigned long)addr)); |
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} |
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EXPORT_SYMBOL(iounmap); |
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/* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val, |
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* trapping the potential read fault. Returns 0 if the access faulted, |
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* 1 on success. |
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* |
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* This function is primarily used to check addresses on the VME bus. |
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* |
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* Mucking with the page fault handler seems a little hackish to me, but |
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* SunOS, NetBSD, and Mach all implemented this check in such a manner, |
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* so I figure we're allowed. |
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*/ |
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int sun3_map_test(unsigned long addr, char *val) |
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{ |
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int ret = 0; |
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__asm__ __volatile__ |
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(".globl _sun3_map_test_start\n" |
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"_sun3_map_test_start:\n" |
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"1: moveb (%2), (%0)\n" |
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" moveq #1, %1\n" |
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"2:\n" |
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".section .fixup,\"ax\"\n" |
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".even\n" |
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"3: moveq #0, %1\n" |
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" jmp 2b\n" |
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".previous\n" |
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".section __ex_table,\"a\"\n" |
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".align 4\n" |
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".long 1b,3b\n" |
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".previous\n" |
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".globl _sun3_map_test_end\n" |
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"_sun3_map_test_end:\n" |
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: "=a"(val), "=r"(ret) |
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: "a"(addr)); |
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return ret; |
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} |
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EXPORT_SYMBOL(sun3_map_test);
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