160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/*
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* linux/arch/m68k/mm/sun3kmap.c
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*
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* Copyright (C) 2002 Sam Creasey <sammy@sammy.net>
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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/pgtable.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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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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printk("ioremap: got virt %p size %lx(%lx)\n",
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area->addr, size, 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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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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