Question about QEMU and UEFI runtime services
Posted: Sun Jun 13, 2021 3:11 pm
So, I successfully managed to get my OS booting on UEFI. However, my OS is now triple faulting for some reason (despite the fact that I have interrupts and a GDT loaded, both of which are valid). At least, that's my working hypothesis.
Confirming this, however, isn't appearing to be trivial. (I'm on qemu 6.0.0.) When I invoke qemu like so:
Only CPU reset output appears. No interrupts are logged at all. The OVMF log output isn't any help since this doesn't happen in the UEFI preboot environment; I just have that on to debug the bootloader if necessary.
As for the second question, my memory map shows no UEFI runtime services anywhere. It looks like this (kernel output):
Confirming this, however, isn't appearing to be trivial. (I'm on qemu 6.0.0.) When I invoke qemu like so:
Code: Select all
qemu-system-x86_64 -drive format=raw,file=/home/ethin/source/kernel/target/x86_64-kernel-none/debug/boot-uefi-kernel.img -drive if=pflash,format=raw,file=OVMF.fd,readonly=on -no-reboot -drive file=disk.img,if=none,id=NVME01 -device nvme,drive=NVME01,serial=0001 -m 20G -usb -rtc clock=host -cpu host -smp cpus=8 -M q35 -name kernel -s -nographic -enable-kvm -debugcon file:qemu.log -global isa-debugcon.iobase=0x402 -d int,cpu_reset -D qemu2.logAs for the second question, my memory map shows no UEFI runtime services anywhere. It looks like this (kernel output):
Is this normal? The UEFI spec implies that runtime services are always available.[INFO] [kernel] firmware-provided memory map:
[INFO] [kernel] [0-1000]: free
[INFO] [kernel] [1000-87000]: bootloader
[INFO] [kernel] [87000-88000]: free
[INFO] [kernel] [88000-A0000]: bootloader
[INFO] [kernel] [100000-19C000]: bootloader
[INFO] [kernel] [19C000-800000]: free
[INFO] [kernel] [800000-808000]: acpi non-volatile
[INFO] [kernel] [808000-810000]: free
[INFO] [kernel] [810000-900000]: acpi non-volatile
[INFO] [kernel] [900000-1500000]: free
[INFO] [kernel] [1500000-7BEFE000]: free
[INFO] [kernel] [7BEFE000-7BF1E000]: free
[INFO] [kernel] [7BF1E000-7E6F5000]: free
[INFO] [kernel] [7E6F5000-7EAE3000]: free
[INFO] [kernel] [7EAE3000-7EAE4000]: free
[INFO] [kernel] [7EAE4000-7EAE6000]: free
[INFO] [kernel] [7EAE6000-7EB25000]: free
[INFO] [kernel] [7EB25000-7EBCD000]: free
[INFO] [kernel] [7EBCD000-7EC49000]: free
[INFO] [kernel] [7EC49000-7EC86000]: free
[INFO] [kernel] [7EC86000-7EC87000]: free
[INFO] [kernel] [7EC87000-7EC91000]: free
[INFO] [kernel] [7EC91000-7EC94000]: free
[INFO] [kernel] [7EC94000-7ECC8000]: free
[INFO] [kernel] [7ECC8000-7ECCD000]: free
[INFO] [kernel] [7ECCD000-7ECED000]: free
[INFO] [kernel] [7ECED000-7ECF6000]: free
[INFO] [kernel] [7ECF6000-7ED0B000]: free
[INFO] [kernel] [7ED0B000-7ED0D000]: free
[INFO] [kernel] [7ED0D000-7ED21000]: free
[INFO] [kernel] [7ED21000-7ED26000]: free
[INFO] [kernel] [7ED26000-7ED56000]: free
[INFO] [kernel] [7ED56000-7ED60000]: free
[INFO] [kernel] [7ED60000-7ED88000]: free
[INFO] [kernel] [7ED88000-7ED8D000]: free
[INFO] [kernel] [7ED8D000-7ED90000]: free
[INFO] [kernel] [7ED90000-7ED93000]: free
[INFO] [kernel] [7ED93000-7ED9D000]: free
[INFO] [kernel] [7ED9D000-7ED9F000]: free
[INFO] [kernel] [7ED9F000-7EDBB000]: free
[INFO] [kernel] [7EDBB000-7EDBC000]: free
[INFO] [kernel] [7EDBC000-7EDD1000]: free
[INFO] [kernel] [7EDD1000-7EDD9000]: free
[INFO] [kernel] [7EDD9000-7EE00000]: free
[INFO] [kernel] [7EE00000-7F001000]: free
[INFO] [kernel] [7F001000-7F01C000]: free
[INFO] [kernel] [7F01C000-7F01E000]: free
[INFO] [kernel] [7F01E000-7F02B000]: free
[INFO] [kernel] [7F02B000-7F030000]: free
[INFO] [kernel] [7F030000-7F05B000]: free
[INFO] [kernel] [7F05B000-7F05C000]: free
[INFO] [kernel] [7F05C000-7F05F000]: free
[INFO] [kernel] [7F05F000-7F063000]: free
[INFO] [kernel] [7F063000-7F06C000]: free
[INFO] [kernel] [7F06C000-7F072000]: free
[INFO] [kernel] [7F072000-7F085000]: free
[INFO] [kernel] [7F085000-7F08A000]: free
[INFO] [kernel] [7F08A000-7F09D000]: free
[INFO] [kernel] [7F09D000-7F0A1000]: free
[INFO] [kernel] [7F0A1000-7F0C1000]: free
[INFO] [kernel] [7F0C1000-7F0C6000]: free
[INFO] [kernel] [7F0C6000-7F0E3000]: free
[INFO] [kernel] [7F0E3000-7F0EC000]: free
[INFO] [kernel] [7F0EC000-7F109000]: free
[INFO] [kernel] [7F109000-7F10E000]: free
[INFO] [kernel] [7F10E000-7F119000]: free
[INFO] [kernel] [7F119000-7F11A000]: free
[INFO] [kernel] [7F11A000-7F11C000]: free
[INFO] [kernel] [7F11C000-7F11E000]: free
[INFO] [kernel] [7F11E000-7F123000]: free
[INFO] [kernel] [7F123000-7F126000]: free
[INFO] [kernel] [7F126000-7F130000]: free
[INFO] [kernel] [7F130000-7F172000]: free
[INFO] [kernel] [7F172000-7F183000]: free
[INFO] [kernel] [7F183000-7F186000]: free
[INFO] [kernel] [7F186000-7F188000]: free
[INFO] [kernel] [7F188000-7F18B000]: free
[INFO] [kernel] [7F18B000-7F18C000]: free
[INFO] [kernel] [7F18C000-7F18E000]: free
[INFO] [kernel] [7F18E000-7F194000]: free
[INFO] [kernel] [7F194000-7F594000]: free
[INFO] [kernel] [7F594000-7F59A000]: free
[INFO] [kernel] [7F59A000-7F59B000]: free
[INFO] [kernel] [7F59B000-7F59D000]: free
[INFO] [kernel] [7F59D000-7F59E000]: free
[INFO] [kernel] [7F59E000-7F5A4000]: free
[INFO] [kernel] [7F5A4000-7F5A7000]: free
[INFO] [kernel] [7F5A7000-7F5B8000]: free
[INFO] [kernel] [7F5B8000-7F8EF000]: free
[INFO] [kernel] [7F8EF000-7F9EF000]: free
[INFO] [kernel] [7F9EF000-7FAEF000]: free
[INFO] [kernel] [7FAEF000-7FB6F000]: reserved
[INFO] [kernel] [7FB6F000-7FB7F000]: acpi reclaimable
[INFO] [kernel] [7FB7F000-7FBFF000]: acpi non-volatile
[INFO] [kernel] [7FBFF000-7FE00000]: free
[INFO] [kernel] [7FE00000-7FE13000]: free
[INFO] [kernel] [7FE13000-7FE33000]: free
[INFO] [kernel] [7FE33000-7FE59000]: free
[INFO] [kernel] [7FE59000-7FE9B000]: free
[INFO] [kernel] [7FE9B000-7FEBC000]: free
[INFO] [kernel] [7FEBC000-7FF40000]: free
[INFO] [kernel] [7FF40000-80000000]: acpi non-volatile
[INFO] [kernel] [100000000-140000000]: free
[INFO] [kernel] [140000000-140351000]: free
[INFO] [kernel] [140351000-580000000]: free
[INFO] [kernel] [B0000000-C0000000]: reserved
[INFO] [kernel] [FFC00000-100000000]: mmio