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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/mm/sun3kmap.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/m68k/mm/sun3kmap.c')
-rw-r--r-- | arch/m68k/mm/sun3kmap.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/m68k/mm/sun3kmap.c b/arch/m68k/mm/sun3kmap.c new file mode 100644 index 000000000000..7f0d86f3fe73 --- /dev/null +++ b/arch/m68k/mm/sun3kmap.c @@ -0,0 +1,156 @@ +/* + * linux/arch/m68k/mm/sun3kmap.c + * + * Copyright (C) 2002 Sam Creasey <sammy@sammy.net> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/vmalloc.h> + +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/io.h> +#include <asm/sun3mmu.h> + +#undef SUN3_KMAP_DEBUG + +#ifdef SUN3_KMAP_DEBUG +extern void print_pte_vaddr(unsigned long vaddr); +#endif + +extern void mmu_emu_map_pmeg (int context, int vaddr); + +static inline void do_page_mapin(unsigned long phys, unsigned long virt, + unsigned long type) +{ + unsigned long pte; + pte_t ptep; + + ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL); + pte = pte_val(ptep); + pte |= type; + + sun3_put_pte(virt, pte); + +#ifdef SUN3_KMAP_DEBUG + print_pte_vaddr(virt); +#endif + +} + +static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt, + unsigned long type, int pages) +{ + + if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG) + mmu_emu_map_pmeg(sun3_get_context(), virt); + + while(pages) { + do_page_mapin(phys, virt, type); + phys += PAGE_SIZE; + virt += PAGE_SIZE; + pages--; + } +} + +void *sun3_ioremap(unsigned long phys, unsigned long size, + unsigned long type) +{ + struct vm_struct *area; + unsigned long offset, virt, ret; + int pages; + + if(!size) + return NULL; + + /* page align */ + offset = phys & (PAGE_SIZE-1); + phys &= ~(PAGE_SIZE-1); + + size += offset; + size = PAGE_ALIGN(size); + if((area = get_vm_area(size, VM_IOREMAP)) == NULL) + return NULL; + +#ifdef SUN3_KMAP_DEBUG + printk("ioremap: got virt %p size %lx(%lx)\n", + area->addr, size, area->size); +#endif + + pages = size / PAGE_SIZE; + virt = (unsigned long)area->addr; + ret = virt + offset; + + while(pages) { + int seg_pages; + + seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE; + if(seg_pages > pages) + seg_pages = pages; + + do_pmeg_mapin(phys, virt, type, seg_pages); + + pages -= seg_pages; + phys += seg_pages * PAGE_SIZE; + virt += seg_pages * PAGE_SIZE; + } + + return (void *)ret; + +} + + +void *__ioremap(unsigned long phys, unsigned long size, int cache) +{ + + return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO); + +} + +void iounmap(void *addr) +{ + vfree((void *)(PAGE_MASK & (unsigned long)addr)); +} + +/* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val, + * trapping the potential read fault. Returns 0 if the access faulted, + * 1 on success. + * + * This function is primarily used to check addresses on the VME bus. + * + * Mucking with the page fault handler seems a little hackish to me, but + * SunOS, NetBSD, and Mach all implemented this check in such a manner, + * so I figure we're allowed. + */ +int sun3_map_test(unsigned long addr, char *val) +{ + int ret = 0; + + __asm__ __volatile__ + (".globl _sun3_map_test_start\n" + "_sun3_map_test_start:\n" + "1: moveb (%2), (%0)\n" + " moveq #1, %1\n" + "2:\n" + ".section .fixup,\"ax\"\n" + ".even\n" + "3: moveq #0, %1\n" + " jmp 2b\n" + ".previous\n" + ".section __ex_table,\"a\"\n" + ".align 4\n" + ".long 1b,3b\n" + ".previous\n" + ".globl _sun3_map_test_end\n" + "_sun3_map_test_end:\n" + : "=a"(val), "=r"(ret) + : "a"(addr)); + + return ret; +} |