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currently the EFI loader's behavior is to search all disks in a
firmware-defined order. we search the list returned by the firmware
in reverse order in the hopes of searching the first 9FAT instead of
the ESP, but this results in unintuitive behavior when there are
multiple FAT partitions (possibly in multiple disks), such as loading
a plan9.ini and kernel from a different disk than the one you executed
the EFI loader from.
to resolve this, we change the EFI loader to instead prefer read
plan9.ini and the kernel from the same disk as the EFI loader was read
from, and then fall back to the old behavior, since the old behavior
is relied on by current installations.
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Some UEFI implementations use random UUID based DUID instead of
ethernet address, but use ethernet derived link-local addresses.
So extract the MAC from our IPv6 address.
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this makes virtual "memdisk" from SYSLINUX accessible to
the kernel, allowing the iso to be loaded via TFTP and
started without any ethernet or disk drivers available.
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copying files from the uefi shell works, reading plan9.ini works,
loading the kernel by calling Read to read in the DATA section of
the kernel *FAILS*. my guess is that uefi filesystem driver or
nvme driver tries to allocate a temporary buffer and hasnt got
the space. limiting the read size fixes it.
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documentation
there isnt much of a point in keep maintaining separate
kernel configurations for terminal and cpu kernels as
the role can be switched with service=cpu boot parameter.
to make stuff cosistent, we will just have one "pc" kernel
and one "pc64" kernel configuration now.
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otherwise
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partition
try the handle buffer in reverse order looking for plan9.ini
to find plan9 partition (9fat). when that fails, we'll default
to the first handle which should be the esp.
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option of mk9660)
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instead of including kernel and config in the efi
fat image, we can just include the loaders and
read the plan9.ini and kernel from iso filesystem
just like the bios loaders.
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when /cfg/pxe/ file isnt there
having the memconf() (*e820=) last clutters the screen.
do it first, so we can read *acpi= and *bootscreen=
prints.
we want to continue using tftp even when the /cfg/pxe/$ether
file is not found. only when we detect no pxe/dhcp session,
then we switch to local filesystem (non-network boot).
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protocols to find a usable one
the gop returned by LocateProtocol() is not usable on thinkpad x230,
so iterate over all handles to find a usable one.
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this is basically a port of 9boot to EFI. theres
support for IA32 (386) and X64 (amd64).
has been tested only under qemu with OVMF so far.
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smart boot manager has a "FAT" signature in its mbr causing
9bootfat to "detect" it as a fat filesystem and then fails
to find plan9.ini.
there shouldnt be a fat filesystem on harddrives at block 0, only
on floppy drives. but some bioses use floppy drive numbers
for usb harddrives so still check for a partition table.
thanks aap for debugging this.
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always look for 9fat in plan9 partition even tho the partition
is *not* maked active. marking partitions active is not
recommended anymore with grub so this makes life easier for
some people. multiple plan9 partitions on a single drive
is not supported.
have to copy partition table as buf gets trashed when reading
first block of fat partition. it worked only when the first
fat partition found (the one marked active) was the right one,
but conffat() can fail.
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pbs failed to load (silently loading garbage) 9BOOTFAT from start
cluster beyond FFFF because we ignored the low word from the
directory entry. now taking the high 16 bit of the directory's
start cluster into account.
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rearrange sub.c for putc(), readn(), memcmp(), memmove(), strchr() and strlen()
and uart to fit into the first 2K of the image.
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console/plan9.ini
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send ACK reply for duplicate data packets in case our ack response
got lost. make sure packets are in sequence and ignore out of
oder packets (except the ones we'v already acked).
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the prompt.
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retry on failure.
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path prefixes
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