svn commit: r205649 - head/sys/compat/x86bios
Jung-uk Kim
jkim at FreeBSD.org
Thu Mar 25 17:03:53 UTC 2010
Author: jkim
Date: Thu Mar 25 17:03:52 2010
New Revision: 205649
URL: http://svn.freebsd.org/changeset/base/205649
Log:
Optimize real mode page table lookup.
Modified:
head/sys/compat/x86bios/x86bios.c
Modified: head/sys/compat/x86bios/x86bios.c
==============================================================================
--- head/sys/compat/x86bios/x86bios.c Thu Mar 25 16:31:05 2010 (r205648)
+++ head/sys/compat/x86bios/x86bios.c Thu Mar 25 17:03:52 2010 (r205649)
@@ -112,17 +112,16 @@ x86bios_set_fault(struct x86emu *emu, ui
static void *
x86bios_get_pages(uint32_t offset, size_t size)
{
- int i;
+ vm_offset_t page;
if (offset + size > X86BIOS_MEM_SIZE + X86BIOS_IVT_SIZE)
return (NULL);
if (offset >= X86BIOS_MEM_SIZE)
offset -= X86BIOS_MEM_SIZE;
- i = offset / X86BIOS_PAGE_SIZE;
- if (x86bios_map[i] != 0)
- return ((void *)(x86bios_map[i] + offset -
- i * X86BIOS_PAGE_SIZE));
+ page = x86bios_map[offset / X86BIOS_PAGE_SIZE];
+ if (page != 0)
+ return ((void *)(page + offset % X86BIOS_PAGE_SIZE));
return (NULL);
}
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