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    SubjectRe: [patch] tls-2.5.31-C3

    On Mon, 12 Aug 2002, Stephen Rothwell wrote:

    > > - .quad 0x0040920000000000 /* 0x40 APM set up for bad BIOS's */
    > > - .quad 0x00409a0000000000 /* 0x48 APM CS code */
    > > - .quad 0x00009a0000000000 /* 0x50 APM CS 16 code (16 bit) */
    > > - .quad 0x0040920000000000 /* 0x58 APM DS data */
    > > + .quad 0x0040920000000000 /* 0x80 APM set up for bad BIOS's */
    > > + .quad 0x00409a0000000000 /* 0x88 APM CS code */
    > > + .quad 0x00009a0000000000 /* 0x90 APM CS 16 code (16 bit) */
    > > + .quad 0x0040920000000000 /* 0x98 APM DS data */
    >
    > I just lost 0x40 which needs to be exactly 0x40 if it is do its job
    > (i.e. cope with brain dead BIOS writers using 0x40 as a segment offset
    > in protected mode ...

    you can save/restore 0x40 in kernel-space if you need to no problem.

    > The idea is that segment 0x40 maps from physical address 0x400 to the
    > end of the first physical page. As a real mode program would (more or
    > less) expect it to.

    so you are using the kernel's GDT in real mode as well?

    Ingo

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