2018-06-05 14:34:03 -04:00
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BOOTBOOT UEFI Implementation
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============================
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See [BOOTBOOT Protocol](https://gitlab.com/bztsrc/bootboot) for common details.
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On [UEFI machines](http://www.uefi.org/), the PCI Option ROM is created from the standard EFI
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OS loader application.
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Machine state
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-------------
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2019-02-07 18:41:34 -05:00
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IRQs masked. GDT unspecified, but valid, IDT unset. SSE, SMP enabled. Code is running in supervisor mode in ring 0 on all cores.
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2018-06-05 14:34:03 -04:00
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File system drivers
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-------------------
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For boot partition, UEFI version relies on any file system that's supported by EFI Simple File System Protocol.
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2018-11-09 06:43:03 -05:00
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This implementation supports both SHA-XOR-CBC and AES-256-CBC cipher.
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2018-06-05 14:34:03 -04:00
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Installation
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------------
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1. *UEFI disk*: copy __bootboot.efi__ to **_FS0:\EFI\BOOT\BOOTX64.EFI_**.
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2. *UEFI ROM*: use __bootboot.rom__ which is a standard **_PCI Option ROM image_**.
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3. *GRUB*, *UEFI Boot Manager*: add __bootboot.efi__ to boot options.
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2019-02-18 08:31:39 -05:00
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You can also run the loader in interactive mode from the EFI Shell, appending options to its command line.
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```
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FS0:\> EFI\BOOT\BOOTX64.EFI /?
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BOOTBOOT LOADER (build Oct 11 2017)
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SYNOPSIS
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BOOTBOOT.EFI [ -h | -? | /h | /? ] [ INITRDFILE [ ENVIRONMENTFILE [...] ] ]
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DESCRIPTION
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Bootstraps an operating system via the BOOTBOOT Protocol.
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If arguments not given, defaults to
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FS0:\BOOTBOOT\INITRD as ramdisk image and
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FS0:\BOOTBOOT\CONFIG for boot environment.
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Additional "key=value" command line arguments will be appended to the
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environment. If INITRD not found, it will use the first bootable partition
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in GPT. If CONFIG not found, it will look for /sys/config inside the
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INITRD (or partition).
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As this is a loader, it is not supposed to return control to the shell.
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FS0:\>
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```
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2018-06-05 14:34:03 -04:00
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Limitations
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-----------
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- Maps the first 16G of RAM.
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- PCI Option ROM should be signed in order to work.
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- Compressed initrd in ROM is limited to 16M.
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