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| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2018-11-15 13:42:15 +0100 |
|---|---|---|
| committer | Patrick Rudolph <siro@das-labor.org> | 2020-08-19 10:50:49 +0000 |
| commit | 57907fcebf12961a0dbd7300472a83711d251375 (patch) | |
| tree | 45af61a09deadf196a63ce7778696a1cbf9f3f05 /Documentation/arch | |
| parent | e3dd57e1061760d37a3b1e38fc9a9c1ff9fdba66 (diff) | |
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>
Diffstat (limited to 'Documentation/arch')
| -rw-r--r-- | Documentation/arch/x86/index.md | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/Documentation/arch/x86/index.md b/Documentation/arch/x86/index.md index 7b9e1fcfa0..11d8a4f77b 100644 --- a/Documentation/arch/x86/index.md +++ b/Documentation/arch/x86/index.md @@ -5,10 +5,11 @@ This section contains documentation about coreboot on x86 architecture. * [x86 PAE support](pae.md) ## State of x86_64 support -At the moment there's no single board that supports x86_64 or to be exact -`ARCH_RAMSTAGE_X86_64` and `ARCH_ROMSTAGE_X86_64`. +At the moment there's only experimental x86_64 support. +The `emulation/qemu-i440fx` and `emulation/qemu-q35` boards do support +*ARCH_RAMSTAGE_X86_64* , *ARCH_POSTCAR_X86_64* and *ARCH_ROMSTAGE_X86_64*. -In order to add support for x86_64 the following assumptions are made: +In order to add support for x86_64 the following assumptions were made: * The CPU supports long mode * All memory returned by malloc must be below 4GiB in physical memory * All code that is to be run must be below 4GiB in physical memory @@ -39,18 +40,16 @@ The page tables contains the following structure: At the moment *$n* is 4, which results in identity mapping the lower 4 GiB. -## Steps to add basic support for x86_64 -* Add x86_64 toolchain support - *DONE* -* Fix compilation errors - *DONE* -* Fix linker errors - *TODO* -* Add x86_64 rmodule support - *DONE* -* Add x86_64 exception handlers - *DONE* -* Setup page tables for long mode - *DONE* -* Add assembly code for long mode - *DONE* -* Add assembly code for SMM - *DONE* -* Add assembly code for postcar stage - *DONE* -* Add assembly code to return to protected mode - *DONE* -* Implement reference code for mainboard `emulation/qemu-q35` - *TODO* +## Basic x86_64 support +Basic support for x86_64 has been implemented for QEMU mainboard target. + +## Reference implementation +The reference implementation is +* [QEMU i440fx](../../mainboard/emulation/qemu-i440fx.md) +* [QEMU Q35](../../mainboard/emulation/qemu-q35.md) + +## TODO +* Identity map memory above 4GiB in ramstage ## Future work |