segments set up/user selectors

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Hi,

question about following value in head.S
 
.quad 0x00cf9a000000ffff    /* 0x10 kernel 4GB code 
.quad 0x00cf92000000ffff    /* 0x18 kernel 4GB data 
.quad 0x00cffa000000ffff    /* 0x23 user 4GB code 
.quad 0x00cff2000000ffff    /* 0x2B user 4GB data


why user selector 0x23 and 0x28? my stupid mind is
thinking about 0x20 and 0x28.
please straight my foolish mind.
thanks,

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