From our investigations (Timo & I), there seems to be a memory corruption when using a PXE boot on VBox.
You're committing a hack to workaround this memory corruption (which replaces code which seems correct by some other code which is probably correct), which lets you go a little bit further, where memory corruption seems to strike again. And thus, this doesn't bring PXE boot in better shape. Furthermore, it appears that you're working around a bug which isn't in ReactOS but in VBox. As a reminder, PXE boot works fine with Qemu, with VMware. And when changing the ROM of VBox [1], then PXE boot works on VBox as well. Revert and report to VirtualBox instead. Our code is correct. Thanks to Timo & Hervé for their help on digging into this issue. [1]: https://git.ipxe.org/ipxe.git/blob/HEAD:/src/config/vbox/README On 10/01/2015 01:21, hbelu...@svn.reactos.org wrote: > Author: hbelusca > Date: Sat Jan 10 00:21:33 2015 > New Revision: 66022 > > URL: http://svn.reactos.org/svn/reactos?rev=66022&view=rev > Log: > [FREELDR]: Commit a temporary "hackfix" for (Pc)GetTime: on VBox when booting > with PXE, for some mysterious reason, Int386(0x1A) call with AH = 0x02 (Get > CMOS Time) *never ever* returns!! (however without PXE everything works). > So... is it some kind of stack overflow or whatever that makes the Int386 > function stack messy? Or something else? So in the meantime we use direct > CMOS port reads. Timo, Hervé (and others), can you please review? And in > particular why does it happen only with PXE? > > Modified: > trunk/reactos/boot/freeldr/freeldr/arch/i386/pcrtc.c > > Modified: trunk/reactos/boot/freeldr/freeldr/arch/i386/pcrtc.c > URL: > http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/i386/pcrtc.c?rev=66022&r1=66021&r2=66022&view=diff > ============================================================================== > --- trunk/reactos/boot/freeldr/freeldr/arch/i386/pcrtc.c [iso-8859-1] > (original) > +++ trunk/reactos/boot/freeldr/freeldr/arch/i386/pcrtc.c [iso-8859-1] > Sat Jan 10 00:21:33 2015 > @@ -20,10 +20,50 @@ > > #define BCD_INT(bcd) (((bcd & 0xf0) >> 4) * 10 + (bcd &0x0f)) > > +#ifndef INT386_WITH_INT_1A_AH_02_04__IS__FIXED > + > +/* CMOS Registers and Ports */ > +#define CMOS_CONTROL_PORT (PUCHAR)0x70 > +#define CMOS_DATA_PORT (PUCHAR)0x71 > + > +#define RTC_REGISTER_A 0x0A > +#define RTC_REG_A_UIP 0x80 > + > +static UCHAR > +HalpReadCmos(IN UCHAR Reg) > +{ > + /* Select the register */ > + WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, Reg); > + > + /* Query the value */ > + return READ_PORT_UCHAR(CMOS_DATA_PORT); > +} > + > +#endif > + > TIMEINFO* > PcGetTime(VOID) > { > static TIMEINFO TimeInfo; > + > +#ifndef INT386_WITH_INT_1A_AH_02_04__IS__FIXED > + > + /* Loop while update is in progress */ > + while ((HalpReadCmos(RTC_REGISTER_A)) & RTC_REG_A_UIP); > + > + /* Set the time data */ > + TimeInfo.Second = BCD_INT(HalpReadCmos(0)); > + TimeInfo.Minute = BCD_INT(HalpReadCmos(2)); > + TimeInfo.Hour = BCD_INT(HalpReadCmos(4)); > + TimeInfo.Day = BCD_INT(HalpReadCmos(7)); > + TimeInfo.Month = BCD_INT(HalpReadCmos(8)); > + TimeInfo.Year = BCD_INT(HalpReadCmos(9)); > + > + /* Compensate for the century field */ > + TimeInfo.Year += (TimeInfo.Year > 80) ? 1900: 2000; > + > +#else > + > REGS Regs; > > for (;;) > @@ -86,6 +126,9 @@ > > break; > } > + > +#endif > + > return &TimeInfo; > } > > > -- Pierre Schweitzer <pierre at reactos.org> System & Network Administrator Senior Kernel Developer ReactOS Deutschland e.V.
smime.p7s
Description: S/MIME Cryptographic Signature
_______________________________________________ Ros-dev mailing list Ros-dev@reactos.org http://www.reactos.org/mailman/listinfo/ros-dev
