> > Index: arch/amd64/stand/libsa/gidt.S > =================================================================== > RCS file: /cvs/src/sys/arch/amd64/stand/libsa/gidt.S,v > retrieving revision 1.11 > diff -u -p -u -r1.11 gidt.S > --- arch/amd64/stand/libsa/gidt.S 27 Oct 2012 15:43:42 -0000 1.11 > +++ arch/amd64/stand/libsa/gidt.S 9 Nov 2019 06:50:57 -0000 > @@ -423,14 +423,6 @@ intno = . - 1 > movl %edx, 0x9*4(%esp) > movb %bh , 0xe*4(%esp) > > - /* clear NT flag in eflags */ > - /* Martin Fredriksson <mar...@gbg.netman.se> */ > - pushf > - pop %eax > - and $0xffffbfff, %eax > - push %eax > - popf > - > /* save registers into save area */ > movl %eax, _C_LABEL(BIOS_regs)+BIOSR_AX > movl %ecx, _C_LABEL(BIOS_regs)+BIOSR_CX > @@ -438,6 +430,13 @@ intno = . - 1 > movl %ebp, _C_LABEL(BIOS_regs)+BIOSR_BP > movl %esi, _C_LABEL(BIOS_regs)+BIOSR_SI > movl %edi, _C_LABEL(BIOS_regs)+BIOSR_DI > + > + /* clear NT flag in eflags */ > + pushf > + pop %eax > + and $0xffffbfff, %eax > + push %eax > + popf > > pop %gs > pop %fs > Index: arch/i386/stand/libsa/gidt.S > =================================================================== > RCS file: /cvs/src/sys/arch/i386/stand/libsa/gidt.S,v > retrieving revision 1.36 > diff -u -p -u -r1.36 gidt.S > --- arch/i386/stand/libsa/gidt.S 31 Oct 2012 13:55:58 -0000 1.36 > +++ arch/i386/stand/libsa/gidt.S 9 Nov 2019 06:51:29 -0000 > @@ -426,14 +426,6 @@ intno = . - 1 > movl %edx, 0x9*4(%esp) > movb %bh , 0xe*4(%esp) > > - /* clear NT flag in eflags */ > - /* Martin Fredriksson <mar...@gbg.netman.se> */ > - pushf > - pop %eax > - and $0xffffbfff, %eax > - push %eax > - popf > - > /* save registers into save area */ > movl %eax, _C_LABEL(BIOS_regs)+BIOSR_AX > movl %ecx, _C_LABEL(BIOS_regs)+BIOSR_CX > @@ -441,6 +433,13 @@ intno = . - 1 > movl %ebp, _C_LABEL(BIOS_regs)+BIOSR_BP > movl %esi, _C_LABEL(BIOS_regs)+BIOSR_SI > movl %edi, _C_LABEL(BIOS_regs)+BIOSR_DI > + > + /* clear NT flag in eflags */ > + pushf > + pop %eax > + and $0xffffbfff, %eax > + push %eax > + popf > > pop %gs > pop %fs
These changes work for me. As part of my Masterthesis im working on a measured boot with OpenBSD and to communicate with the TPM from within boot (8) BIOS calls are a convenient way to do so. Thanks for the fast response Julius
