Re: [ros-dev] [ros-diffs] [dgorbachev] 42305: Add a hack in KiSystemStartupReal function until Better Times.

[Aleksey Bragin]

That function is not supposed to be called by old bootloader  
directly. Why is that needed? And why in this function?

WBR,
Aleksey Bragin.

On Jul 30, 2009, at 9:54 PM, [e-mail] wrote:
> Author: dgorbachev
> Date: Thu Jul 30 19:54:01 2009
> New Revision: 42305
>
> URL: http://svn.reactos.org/svn/reactos?rev=42305&view=rev
> Log:
> Add a hack in KiSystemStartupReal function until Better Times.
>
> Modified:
>     trunk/reactos/ntoskrnl/ke/i386/kiinit.c
>
> Modified: trunk/reactos/ntoskrnl/ke/i386/kiinit.c
> URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/ 
> i386/kiinit.c?rev=42305&r1=42304&r2=42305&view=diff
> ====================================================================== 
> ========
> --- trunk/reactos/ntoskrnl/ke/i386/kiinit.c [iso-8859-1] (original)
> +++ trunk/reactos/ntoskrnl/ke/i386/kiinit.c [iso-8859-1] Thu Jul 30  
> 19:54:01 2009
> @@ -712,18 +712,34 @@
>      Ke386SetDs(KGDT_R3_DATA | RPL_MASK);
>      Ke386SetEs(KGDT_R3_DATA | RPL_MASK);
> /* Save NMI and double fault traps */
> RtlCopyMemory(&NmiEntry, &Idt[2], sizeof(KIDTENTRY));
> RtlCopyMemory(&DoubleFaultEntry, &Idt[8], sizeof(KIDTENTRY));
> /* Copy kernel's trap handlers */
> RtlCopyMemory(Idt,
>              (PVOID)KiIdtDescriptor.Base,
>              KiIdtDescriptor.Limit + 1);
> /* Restore NMI and double fault */
> RtlCopyMemory(&Idt[2], &NmiEntry, sizeof(KIDTENTRY));
> RtlCopyMemory(&Idt[8], &DoubleFaultEntry, sizeof(KIDTENTRY));
> /* HACK compensates for KiRosPrepareForSystemStartup hack */
> if ((ULONG)Idt == KiIdtDescriptor.Base)
> {
>    USHORT FlippedSelector;
>    FlippedSelector = KiIdt[2].Selector;
>    KiIdt[2].Selector = KiIdt[2].ExtendedOffset;
>    KiIdt[2].ExtendedOffset = FlippedSelector;
>    FlippedSelector = KiIdt[8].Selector;
>    KiIdt[8].Selector = KiIdt[8].ExtendedOffset;
>    KiIdt[8].ExtendedOffset = FlippedSelector;
> }
> else
> {
>    /* Save NMI and double fault traps */
>    RtlCopyMemory(&NmiEntry, &Idt[2], sizeof(KIDTENTRY));
>    RtlCopyMemory(&DoubleFaultEntry, &Idt[8], sizeof(KIDTENTRY));
>    /* Copy kernel's trap handlers */
>    RtlCopyMemory(Idt,
>                  (PVOID)KiIdtDescriptor.Base,
>                  KiIdtDescriptor.Limit + 1);
>    /* Restore NMI and double fault */
>    RtlCopyMemory(&Idt[2], &NmiEntry, sizeof(KIDTENTRY));
>    RtlCopyMemory(&Idt[8], &DoubleFaultEntry, sizeof(KIDTENTRY));
> }
>
> AppCpuInit:
>      /* Loop until we can release the freeze lock */