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Optimize real mode page table lookup.

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This commit is contained in:
Jung-uk Kim 2010-03-25 17:03:52 +00:00
parent ad51361a2c
commit d7312c88b4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=205649
1 changed files with 4 additions and 5 deletions
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9
sys/compat/x86bios/x86bios.c
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@ -112,17 +112,16 @@ x86bios_set_fault(struct x86emu *emu, uint32_t addr)
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);
}