mb/emulation/qemu-q35,qemu-i440fx: Add x86_64 support
* Enable optional x86_64 romstage, postcar and ramstage * Add Kconfig for x86_64 compilation * Add documentation for x86 qemu mainboards * Increase CAR stack as x86_64 uses more than 0x4000 bytes Working: * Boots to Linux * Boots to SeaBIOS * Drops to protected mode at end of ramstage * Enumerates PCI devices * Relocateable ramstage * SMM Change-Id: If2f02a95b2f91ab51043d4e81054354f4a6eb5d5 Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/29667 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@ -5,10 +5,11 @@ This section contains documentation about coreboot on x86 architecture.
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* [x86 PAE support](pae.md)
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## State of x86_64 support
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At the moment there's no single board that supports x86_64 or to be exact
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`ARCH_RAMSTAGE_X86_64` and `ARCH_ROMSTAGE_X86_64`.
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At the moment there's only experimental x86_64 support.
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The `emulation/qemu-i440fx` and `emulation/qemu-q35` boards do support
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*ARCH_RAMSTAGE_X86_64* , *ARCH_POSTCAR_X86_64* and *ARCH_ROMSTAGE_X86_64*.
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In order to add support for x86_64 the following assumptions are made:
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In order to add support for x86_64 the following assumptions were made:
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* The CPU supports long mode
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* All memory returned by malloc must be below 4GiB in physical memory
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* All code that is to be run must be below 4GiB in physical memory
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@ -39,18 +40,16 @@ The page tables contains the following structure:
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At the moment *$n* is 4, which results in identity mapping the lower 4 GiB.
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## Steps to add basic support for x86_64
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* Add x86_64 toolchain support - *DONE*
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* Fix compilation errors - *DONE*
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* Fix linker errors - *TODO*
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* Add x86_64 rmodule support - *DONE*
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* Add x86_64 exception handlers - *DONE*
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* Setup page tables for long mode - *DONE*
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* Add assembly code for long mode - *DONE*
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* Add assembly code for SMM - *DONE*
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* Add assembly code for postcar stage - *DONE*
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* Add assembly code to return to protected mode - *DONE*
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* Implement reference code for mainboard `emulation/qemu-q35` - *TODO*
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## Basic x86_64 support
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Basic support for x86_64 has been implemented for QEMU mainboard target.
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## Reference implementation
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The reference implementation is
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* [QEMU i440fx](../../mainboard/emulation/qemu-i440fx.md)
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* [QEMU Q35](../../mainboard/emulation/qemu-q35.md)
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## TODO
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* Identity map memory above 4GiB in ramstage
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## Future work
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@ -0,0 +1,64 @@
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# qemu i440fx mainboard
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## Running coreboot in qemu
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Emulators like qemu don't need a firmware to do hardware init.
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The hardware starts in the configured state already.
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The coreboot port allows to test non mainboard specific code.
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As you can easily attach a debugger, it's a good target for
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experimental code.
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## coreboot x86_64 support
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coreboot historically runs in 32-bit protected mode, even though the
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processor supports x86_64 instructions (long mode).
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The qemu-i440fx mainboard has been ported to x86_64 and will serve as
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reference platform to enable additional platforms.
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To enable the support set the Kconfig option ``CONFIG_CPU_QEMU_X86_64=y``.
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## Installing qemu
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On debian you can install qemu by running:
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```bash
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$ sudo apt-get install qemu
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```
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On redhat you can install qemu by running:
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```bash
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$ sudo dnf install qemu
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```
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## Running coreboot
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### To run the i386 version of coreboot (default)
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Running on qemu-system-i386 will require a 32 bit operating system.
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```bash
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qemu-system-i386 -bios build/coreboot.rom -serial stdio -M pc
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```
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### To run the experimental x86_64 version of coreboot
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Running on qemu-system-x86_64 allows to run a 32 bit or 64 bit operating system,
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as well as firmware.
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```bash
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qemu-system-x86_64 -bios build/coreboot.rom -serial stdio -M pc
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```
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## Finding bugs
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To test coreboot's x86 code it's recommended to run on a x86 host and enable KVM.
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It will not only run faster, but is closer to real hardware. If you see the
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following message:
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KVM internal error. Suberror: 1
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emulation failure
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something went wrong. The same bug will likely cause a FAULT on real hardware,
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too.
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To enable KVM run:
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```bash
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qemu-system-x86_64 -bios build/coreboot.rom -serial stdio -M pc -accel kvm -cpu host
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```
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@ -0,0 +1,64 @@
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# qemu q35 mainboard
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## Running coreboot in qemu
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Emulators like qemu don't need a firmware to do hardware init.
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The hardware starts in the configured state already.
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The coreboot port allows to test non mainboard specific code.
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As you can easily attach a debugger, it's a good target for
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experimental code.
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## coreboot x86_64 support
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coreboot historically runs in 32-bit protected mode, even though the
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processor supports x86_64 instructions (long mode).
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The qemu-q35 mainboard has been ported to x86_64 and will serve as
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reference platform to enable additional platforms.
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To enable the support set the Kconfig option ``CONFIG_CPU_QEMU_X86_64=y``.
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## Installing qemu
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On debian you can install qemu by running:
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```bash
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$ sudo apt-get install qemu
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```
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On redhat you can install qemu by running:
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```bash
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$ sudo dnf install qemu
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```
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## Running coreboot
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### To run the i386 version of coreboot (default)
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Running on qemu-system-i386 will require a 32 bit operating system.
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```bash
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qemu-system-i386 -bios build/coreboot.rom -serial stdio -M q35
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```
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### To run the experimental x86_64 version of coreboot
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Running on `qemu-system-x86_64` allows to run a 32 bit or 64 bit operating system
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and firmware.
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```bash
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qemu-system-x86_64 -bios build/coreboot.rom -serial stdio -M q35
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```
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## Finding bugs
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To test coreboot's x86 code it's recommended to run on a x86 host and enable KVM.
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It will not only run faster, but is closer to real hardware. If you see the
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following message:
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KVM internal error. Suberror: 1
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emulation failure
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something went wrong. The same bug will likely cause a FAULT on real hardware,
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too.
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To enable KVM run:
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```bash
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qemu-system-x86_64 -bios build/coreboot.rom -serial stdio -M q35 -accel kvm -cpu host
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```
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@ -37,6 +37,8 @@ The boards in this section are not real mainboards, but emulators.
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- [Spike RISC-V emulator](emulation/spike-riscv.md)
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- [Qemu RISC-V emulator](emulation/qemu-riscv.md)
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- [Qemu AArch64 emulator](emulation/qemu-aarch64.md)
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- [Qemu x86 Q35](emulation/qemu-q35.md)
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- [Qemu x86 PC](emulation/qemu-i440fx.md)
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## Facebook
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@ -2,12 +2,29 @@
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config CPU_QEMU_X86
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bool
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select ARCH_BOOTBLOCK_X86_32
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select ARCH_VERSTAGE_X86_32
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select ARCH_ROMSTAGE_X86_32
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select ARCH_RAMSTAGE_X86_32
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select SMP
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select UDELAY_TSC
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select TSC_MONOTONIC_TIMER
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select UNKNOWN_TSC_RATE
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select SMM_ASEG
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if CPU_QEMU_X86
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config CPU_QEMU_X86_64
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bool "Experimental 64bit support"
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select ARCH_BOOTBLOCK_X86_64
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select ARCH_VERSTAGE_X86_64
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select ARCH_ROMSTAGE_X86_64
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select ARCH_POSTCAR_X86_64
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select ARCH_RAMSTAGE_X86_64
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config CPU_QEMU_X86_32
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bool
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default n if CPU_QEMU_X86_64
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default y
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select ARCH_BOOTBLOCK_X86_32
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select ARCH_VERSTAGE_X86_32
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select ARCH_ROMSTAGE_X86_32
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select ARCH_POSTCAR_X86_32
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select ARCH_RAMSTAGE_X86_32
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endif
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