36273c5d79
from user mode. Don't disable interrupts when returning from vm86 mode to user mode either. Now, we only disable interrupts before calling a hardware interrupt handler, which is the only time we _should_ be disabling interrupts. Because of this, err, feature, any routine that one called in vm86 mode had to re-enable interrupts by setting the interrupt flag or interrupts would remain disabled even after the routine returned. For example, I have a simple debugging routine that uses a vm86 mode function to dump any arbitrary memory word that I use to read the BIOS timer or any other memory location. This function does 1 load instruction from memory and then returns. Since it didn't re-enable interrupts, the first time I called it to read the BIOS timer, it disabled interrupts. This also affected the PXE bootstrap as it needs interrupts enabled while it is processing. This patch fixes both of those situations so that those functions do not worry about having to enable interrupts. Hardware interrupt handlers worked fine with the old code because they always enable interrupts as part of their routine. If you have any problems with the loader after this commit, please let me know. I'd like to MFC it in a week or two since PXE support needs it. Noticed by: ps, Michael Johnston <michael.johnston@intel.com> |
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