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Changed the set_segment_descriptor()'s usage of the limit/granularity

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flag. Now, it will choose how to set the granularity by evaluating the
limit.
This call was actually already used this way in the kernel, so that
the TLS and TSS segments were much too large (harmless but incorrect).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12231 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2005-04-04 14:34:18 +00:00
parent 9d06770cdc
commit e5b0e0b5e3
2 changed files with 16 additions and 7 deletions
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headers/private/kernel/arch/x86/descriptors.h
+12 -3
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@@ -86,15 +86,24 @@ set_segment_descriptor(struct segment_descriptor *desc, addr_t base, uint32 limi
{
set_segment_descriptor_base(desc, base);
desc->limit_00_15 = (addr_t)limit & 0x0ffff; // limit is 20 bits long
desc->limit_19_16 = ((addr_t)limit >> 16) & 0xf;
// limit is 20 bits long
if (limit & 0xfff00000) {
desc->limit_00_15 = ((addr_t)limit >> 12) & 0x0ffff;
desc->limit_19_16 = ((addr_t)limit >> 28) & 0xf;
desc->granularity = 1; // 4 KB granularity
} else {
desc->limit_00_15 = (addr_t)limit & 0x0ffff;
desc->limit_19_16 = ((addr_t)limit >> 16) & 0xf;
desc->granularity = 0; // 1 byte granularity
}
limit >>= 12;
desc->type = type;
desc->desc_type = DT_CODE_DATA_SEGMENT;
desc->privilege_level = privilegeLevel;
desc->present = 1;
desc->granularity = 1; // 4 GB size (in page size steps)
desc->available = 0; // system available bit is currently not used
desc->d_b = 1; // 32-bit code