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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Patrick Rudolph
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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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