mirror of
https://github.com/linuxboot/linuxboot
synced 2024-11-21 23:59:59 +00:00
fvloader and hello world example dxe modules
This commit is contained in:
Trammell hudson
Trammell Hudson
parent
f0ea0af860
commit
c888af548a
53
dxe/Makefile
Normal file
53
dxe/Makefile
Normal file
@ -0,0 +1,53 @@
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KERNEL = $(shell uname -s)
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CC = $(CROSS)gcc
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TARGETS += fvloader.ffs
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TARGETS += hello.ffs
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all: $(TARGETS)
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clean: FORCE
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$(RM) *.efi *.exe *.rom *.o .*.d $(TARGETS)
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FORCE:
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%.efi: %.exe
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CROSS=$(CROSS) \
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./efi-wrap $< > $@
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%.ffs: %.efi
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../bin/create-ffs \
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-o $@ \
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-t DRIVER \
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-n "$(basename $@)" \
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$<
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BITS=64
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EFI_ARCH=x86_64
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#BITS=32
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#EFI_ARCH=x86
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%.exe: %.o
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$(CROSS)ld \
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-T pei-x86-$(BITS).lds \
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-o $@ \
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$^
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CFLAGS += \
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-std=c99 \
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-D__efi__ \
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-nostdinc \
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-fshort-wchar \
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-mno-red-zone \
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-fno-stack-protector \
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-m$(BITS) \
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-fpic \
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-O3 \
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-W \
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-Wall \
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-I . \
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-MMD \
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-MF .$(notdir $@).d \
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-include .*.d
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84
dxe/README.md
Normal file
84
dxe/README.md
Normal file
@ -0,0 +1,84 @@
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Overview
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===
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These are sample EFI Option ROMs that can be installed in Apple's
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Thunderbolt Gigabit Ethernet adapter. Anything that does printouts
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to the console device will only be visible if you have set the
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`bootargs` NVRAM parameter to verbose mode:
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sudo nvram bootargs=-v
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Once you have build the `hello.rom` file, install it with the `b57tool`.
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Unlike Broadcom's `B57UDAIG.EXE`, this does not require rebooting to DOS
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and works with a hot-plugged Thunderbolt device:
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sudo ../tools/b57tool --pxe hello.rom
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This tool does require that you have installed the `DirectHW.kext` from
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the CoreBoot project.
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Developing ROMs
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===
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Calling conventions
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---
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The EFI environment uses the Microsoft ABI, so gcc must be told which
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functions are called from or call into the EFI system. This is done
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with the `EFIAPI` macro, which annotates the functions with the gcc
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x86 extension [`__attribute__((ms_abi))`](https://gcc.gnu.org/onlinedocs/gcc/x86-Function-Attributes.html#x86-Function-Attributes)
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The entry point into the Option ROM must be named `efi_main()` and
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should have the prototype:
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EFI_STATUS
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EFIAPI
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efi_main(
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EFI_HANDLE image,
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EFI_SYSTEM_TABLE * st
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);
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Any callbacks that are registered, such as for the `ExitBootServices` event,
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must also be flagged with `EFIAPI`.
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Console I/O
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---
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It is possible to print to the screen while EFI is running. The
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`EFI_SYSTEM_TABLE` struct has a `SIMPLE_TEXT_OUTPUT_INTERFACE` pointer `ConOut`
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to a struct with an `OutputString()` function pointer. This function takes
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UCS-2 wide characters:
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st->ConOut->OutputString(st->ConOut, L"Hello, world!\n");
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The screen and the console will likely not be setup when `efi_main()` is
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called, so it is typical to register a callback for `ExitBootServices`
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to do any output.
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As noted above, it is necessary to boot the system in "verbose" mode to
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see any output from EFI. Set the `bootargs` NVRAM variable to configure this:
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sudo nvram bootargs=-v
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Reading keystrokes for a shell or similar can be done with the `ConIn`
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struct. I have not figured out how to use it, but I have figured out how
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to hook it to read key strokes. See `roms/keylogger.c` for an example.
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Memory allocation
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---
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There are lots of pools of memory allocation during EFI, some of which are
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cleared when the OS starts, some of which stay resident, etc. In general
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you can request memory with:
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void * buf;
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if (gST->BootServices->AllocatePool(
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EfiBootServicesData,
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len,
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&buf
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) != 0) {
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// handle an error...
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}
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115
dxe/efi-wrap
Executable file
115
dxe/efi-wrap
Executable file
@ -0,0 +1,115 @@
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#!/usr/bin/perl
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# Convert a gcc/mingw compiled application to a valid EFI executable
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# by reuseing a valid header. The linked doesn't generate the right
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# fields for some reason.
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#
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# This is a total hack and should not be used by anything real.
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# We really should figure out how to make this work the right way.
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#
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# 2015-04-21
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use warnings;
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use strict;
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my $code_size_offset = 0x9C;
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my $data_size_offset = 0xA0;
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my $entry_offset = 0xA8;
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my $code_offset = 0xAC;
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my $CROSS = $ENV{CROSS} || "";
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my $hdr = undump(<DATA>);
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my $file = shift;
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my $input = `${CROSS}objcopy -O binary "$file" "/tmp/$$.bin"; cat "/tmp/$$.bin"`;
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my $header = `${CROSS}readelf -h "$file"`;
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my $len = length $input;
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my ($entry) = $header =~ /Entry point.*?(0x[0-9a-f]*)$/msg
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or die "$file: Unable to parse entry point\n";
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$entry = hex($entry) - 0x1e0;
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my $code_start = 0;
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my $code_size = length($input);
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my $data_size = 0;
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sub undump
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{
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my $bin;
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for (@_)
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{
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my $bytes = substr($_, 9, 16*3);
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$bin .= join '', map { chr(hex $_) } split / /, $bytes;
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}
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return $bin;
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}
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sub offset
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{
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my $offset = shift;
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return unpack("L", substr($input, $offset, 4));
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}
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#my $entry = offset($entry_offset);
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#my $code_start = offset($code_offset);
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#my $code_size = offset($code_size_offset);
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#my $data_size = offset($data_size_offset);
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my $entry_hex = sprintf "%04x", $entry;
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warn sprintf "Read %d bytes; entry %04x, code %04x @ %04x, data %04x\n",
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$len,
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$entry,
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$code_start,
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$code_size,
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$data_size,
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;
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# fixup the entry point based on the difference in the code start values
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$entry = ($entry - $code_start) + length($hdr);
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warn sprintf "New entry: %04x\n", $entry;
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my $img = $hdr . substr($input, $code_start);
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substr($img, $entry_offset, 4) = pack("L", $entry);
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print $img;
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__END__
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0000000: 4d 5a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 MZ..............
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0000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000030: 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 ................
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0000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000080: 50 45 00 00 64 86 04 00 00 00 00 00 a0 e5 00 00 PE..d...........
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0000090: 00 00 00 00 f0 00 0e 03 0b 02 02 38 00 00 00 00 ...........8....
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00000a0: 00 00 00 00 00 00 00 00 7f 8e 00 00 40 02 00 00 ............@...
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00000b0: 00 00 00 00 00 00 00 00 20 00 00 00 20 00 00 00 ........ ... ...
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00000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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00000d0: a0 e5 00 00 40 02 00 00 4f aa 01 00 0b 00 00 00 ....@...O.......
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00000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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00000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000100: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 ................
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0000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ....H...`...1...
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0000140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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0000180: 00 00 00 00 00 00 00 00 2e 74 65 78 74 00 00 00 .........text...
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0000190: a0 db 00 00 40 02 00 00 a0 db 00 00 40 02 00 00 ....@.......@...
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00001a0: 00 00 00 00 00 00 00 00 00 00 00 00 20 00 00 60 ............ ..`
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00001b0: 2e 64 61 74 61 00 00 00 20 07 00 00 e0 dd 00 00 .data... .......
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00001c0: e0 02 00 00 e0 dd 00 00 00 00 00 00 00 00 00 00 ................
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00001d0: 00 00 00 00 60 00 00 e0 2e 72 65 6c 6f 63 00 00 ....`....reloc..
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00001e0: 48 00 00 00 00 e5 00 00 60 00 00 00 00 e5 00 00 H.......`.......
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00001f0: 00 00 00 00 00 00 00 00 00 00 00 00 60 00 00 62 ............`..b
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0000200: 2e 64 65 62 75 67 00 00 31 00 00 00 60 e5 00 00 .debug..1...`...
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0000210: 40 00 00 00 60 e5 00 00 00 00 00 00 00 00 00 00 @...`...........
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0000220: 00 00 00 00 60 00 00 62 00 00 00 00 00 00 00 00 ....`..b........
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0000230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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110
dxe/efi.h
Normal file
110
dxe/efi.h
Normal file
@ -0,0 +1,110 @@
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#ifndef __efi_h__
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#define __efi_h__
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/* Just enough of the EFI API to write some code */
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#define EFIAPI __attribute__((ms_abi))
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#define NULL 0
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typedef int EFI_STATUS;
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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typedef unsigned long uint64_t;
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typedef unsigned short wchar_t;
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typedef void * EFI_HANDLE;
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typedef struct {
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uint64_t Signature;
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uint32_t Revision;
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uint32_t HeaderSize;
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uint32_t CRC32;
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uint32_t Reserved;
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} EFI_TABLE_HEADER;
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typedef struct {
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uint32_t Data1;
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uint16_t Data2;
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uint16_t Data3;
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uint8_t Data4[8];
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} EFI_GUID;
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typedef struct {
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EFI_TABLE_HEADER Hdr;
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void* AddMemorySpace;
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void* AllocateMemorySpace;
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void* FreeMemorySpace;
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void* RemoveMemorySpace;
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void* GetMemorySpaceDescriptor;
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void* SetMemorySpaceAttributes;
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void* GetMemorySpaceMap;
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void* AddIoSpace;
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void* AllocateIoSpace;
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void* FreeIoSpace;
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void* RemoveIoSpace;
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void* GetIoSpaceDescriptor;
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void* GetIoSpaceMap;
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void* Dispatch;
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void* Schedule;
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||||
void* Trust;
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EFI_STATUS EFIAPI (*ProcessFirmwareVolume)(
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void * buffer,
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unsigned len,
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EFI_HANDLE * handle_out
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||||
);
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} EFI_DXE_SERVICES;
|
||||
|
||||
typedef struct {
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EFI_GUID VendorGuid;
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||||
void *VendorTable;
|
||||
} EFI_CONFIGURATION_TABLE;
|
||||
|
||||
typedef struct {
|
||||
EFI_TABLE_HEADER Hdr;
|
||||
|
||||
wchar_t *FirmwareVendor;
|
||||
uint32_t FirmwareRevision;
|
||||
|
||||
void* ConsoleInHandle;
|
||||
void* *ConIn;
|
||||
|
||||
void* ConsoleOutHandle;
|
||||
void* *ConOut;
|
||||
|
||||
void* StandardErrorHandle;
|
||||
void* *StdErr;
|
||||
|
||||
void* *RuntimeServices;
|
||||
void* *BootServices;
|
||||
|
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unsigned NumberOfTableEntries;
|
||||
EFI_CONFIGURATION_TABLE *ConfigurationTable;
|
||||
|
||||
} EFI_SYSTEM_TABLE;
|
||||
|
||||
|
||||
static inline void *
|
||||
efi_find_table(
|
||||
EFI_SYSTEM_TABLE * st,
|
||||
uint32_t search_guid
|
||||
)
|
||||
{
|
||||
const EFI_CONFIGURATION_TABLE * ct = st->ConfigurationTable;
|
||||
|
||||
serial_string("num tables=");
|
||||
serial_hex(st->NumberOfTableEntries, 4);
|
||||
|
||||
for(unsigned i = 0 ; i < st->NumberOfTableEntries ; i++)
|
||||
{
|
||||
const EFI_GUID * guid = &ct[i].VendorGuid;
|
||||
serial_hex(*(uint64_t*)guid, 16);
|
||||
if (guid->Data1 == search_guid)
|
||||
return ct[i].VendorTable;
|
||||
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#endif
|
||||
53
dxe/fvloader.c
Normal file
53
dxe/fvloader.c
Normal file
@ -0,0 +1,53 @@
|
||||
/** \file
|
||||
* Tell DxeCore about an alternate firmware volume in the ROM.
|
||||
*
|
||||
* This allows LinuxBoot to locate the Linux kernel and initrd
|
||||
* outside of the normal DXE volume, which is quite small on some
|
||||
* systems.
|
||||
*/
|
||||
// #define VOLUME_ADDRESS 0xFF840000 // Winterfell
|
||||
// #define VOLUME_LENGTH 0x20000
|
||||
|
||||
// Heron
|
||||
#define VOLUME_ADDRESS 0xFF410000
|
||||
#define VOLUME_LENGTH 0x00800000
|
||||
|
||||
#include "serial.h"
|
||||
#include "efi.h"
|
||||
|
||||
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
efi_main(
|
||||
EFI_HANDLE image,
|
||||
EFI_SYSTEM_TABLE * const st
|
||||
)
|
||||
{
|
||||
(void) image;
|
||||
|
||||
//gST = st;
|
||||
//gBS = gST->BootServices;
|
||||
//gRT = gST->RuntimeServices;
|
||||
|
||||
const EFI_DXE_SERVICES * dxe_services = efi_find_table(st, 0x5ad34ba);
|
||||
|
||||
if (!dxe_services)
|
||||
{
|
||||
serial_string("FvLoader: No DXE system table found...\r\n");
|
||||
return 0x80000001;
|
||||
}
|
||||
|
||||
serial_string("FvLoader: adding firmware volume 0x");
|
||||
serial_hex(VOLUME_ADDRESS, 8);
|
||||
|
||||
EFI_HANDLE handle;
|
||||
int rc = dxe_services->ProcessFirmwareVolume(
|
||||
(void*) VOLUME_ADDRESS,
|
||||
VOLUME_LENGTH,
|
||||
&handle
|
||||
);
|
||||
|
||||
serial_string("FvLoader: rc="); serial_hex(rc, 8);
|
||||
|
||||
return rc;
|
||||
}
|
||||
22
dxe/hello.c
Normal file
22
dxe/hello.c
Normal file
@ -0,0 +1,22 @@
|
||||
/** \file
|
||||
*/
|
||||
#include "serial.h"
|
||||
#include "efi.h"
|
||||
|
||||
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
efi_main(
|
||||
EFI_HANDLE image,
|
||||
EFI_SYSTEM_TABLE * const st
|
||||
)
|
||||
{
|
||||
(void) image;
|
||||
(void) st;
|
||||
|
||||
serial_string("+---------------+\r\n");
|
||||
serial_string("| Hello, world! |\r\n");
|
||||
serial_string("+---------------+\r\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
30
dxe/pei-x86-32.lds
Normal file
30
dxe/pei-x86-32.lds
Normal file
@ -0,0 +1,30 @@
|
||||
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
|
||||
/*OUTPUT_FORMAT("pei-x86-64", "pei-x86-64", "pei-x86-64") */
|
||||
OUTPUT_ARCH(i386)
|
||||
ENTRY(efi_main)
|
||||
SECTIONS
|
||||
{
|
||||
/* 0x1e0 is the size of the MZ header that will be added by gcc */
|
||||
.text 0x1e0 :
|
||||
{
|
||||
*(.text)
|
||||
}
|
||||
|
||||
.data :
|
||||
{
|
||||
*(.rodata*)
|
||||
*(.data*)
|
||||
/* the EFI loader doesn't seem to like a .bss section, so we stick
|
||||
it all into .data: */
|
||||
*(.bss)
|
||||
}
|
||||
|
||||
/DISCARD/ :
|
||||
{
|
||||
*(.xdata*)
|
||||
*(.idata*)
|
||||
*(.pdata*)
|
||||
*(.comment)
|
||||
*(.eh_fram*)
|
||||
}
|
||||
}
|
||||
30
dxe/pei-x86-64.lds
Normal file
30
dxe/pei-x86-64.lds
Normal file
@ -0,0 +1,30 @@
|
||||
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
|
||||
/*OUTPUT_FORMAT("pei-x86-64", "pei-x86-64", "pei-x86-64") */
|
||||
OUTPUT_ARCH(i386:x86-64)
|
||||
ENTRY(efi_main)
|
||||
SECTIONS
|
||||
{
|
||||
/* 0x1e0 is the size of the MZ header that will be added by gcc */
|
||||
.text 0x1e0 :
|
||||
{
|
||||
*(.text)
|
||||
}
|
||||
|
||||
.data :
|
||||
{
|
||||
*(.rodata*)
|
||||
*(.data*)
|
||||
/* the EFI loader doesn't seem to like a .bss section, so we stick
|
||||
it all into .data: */
|
||||
*(.bss)
|
||||
}
|
||||
|
||||
/DISCARD/ :
|
||||
{
|
||||
*(.xdata*)
|
||||
*(.idata*)
|
||||
*(.pdata*)
|
||||
*(.comment)
|
||||
*(.eh_fram*)
|
||||
}
|
||||
}
|
||||
66
dxe/serial.h
Normal file
66
dxe/serial.h
Normal file
@ -0,0 +1,66 @@
|
||||
#ifndef __serial_h__
|
||||
#define __serial_h__
|
||||
|
||||
static __inline void
|
||||
outb (unsigned char __value, unsigned short int __port)
|
||||
{
|
||||
__asm__ __volatile__ ("outb %b0,%w1": :"a" (__value), "Nd" (__port));
|
||||
}
|
||||
|
||||
static __inline unsigned char
|
||||
inb (unsigned short int __port)
|
||||
{
|
||||
unsigned char _v;
|
||||
|
||||
__asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (__port));
|
||||
return _v;
|
||||
}
|
||||
|
||||
#define PORT 0x3f8 /* COM1 */
|
||||
|
||||
#define DLAB 0x80
|
||||
|
||||
#define TXR 0 /* Transmit register (WRITE) */
|
||||
#define RXR 0 /* Receive register (READ) */
|
||||
#define IER 1 /* Interrupt Enable */
|
||||
#define IIR 2 /* Interrupt ID */
|
||||
#define FCR 2 /* FIFO control */
|
||||
#define LCR 3 /* Line control */
|
||||
#define MCR 4 /* Modem control */
|
||||
#define LSR 5 /* Line Status */
|
||||
#define MSR 6 /* Modem Status */
|
||||
#define DLL 0 /* Divisor Latch Low */
|
||||
#define DLH 1 /* Divisor latch High */
|
||||
|
||||
static int is_transmit_empty()
|
||||
{
|
||||
return inb(PORT + 5) & 0x20;
|
||||
}
|
||||
|
||||
static void serial_char(char a) {
|
||||
outb(a, PORT);
|
||||
while (is_transmit_empty() == 0);
|
||||
}
|
||||
|
||||
static void serial_string(const char * s)
|
||||
{
|
||||
while(*s)
|
||||
serial_char(*s++);
|
||||
}
|
||||
|
||||
static void serial_hex(unsigned long x, unsigned digits)
|
||||
{
|
||||
while(digits-- > 0)
|
||||
{
|
||||
unsigned d = (x >> (digits * 4)) & 0xF;
|
||||
if (d >= 0xA)
|
||||
serial_char(d + 'A' - 0xA);
|
||||
else
|
||||
serial_char(d + '0');
|
||||
}
|
||||
serial_char('\r');
|
||||
serial_char('\n');
|
||||
}
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user