lfn
serial
ticket/834-toolchain-update
topic/msim-upgrade
topic/simplify-dev-export
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Last change
on this file since 56dcf53 was 84176f3, checked in by Jakub Jermář <jakub@…>, 7 years ago |
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arm64: Add support for the architecture
This changeset adds basic support to run HelenOS on AArch64, targeting
the QEMU virt platform.
Boot:
- Boot relies on the EDK II firmware, GRUB2 for EFI and the HelenOS
bootloader (UEFI application). EDK II loads GRUB2 from a CD, GRUB2
loads the HelenOS bootloader (via UEFI) which loads OS components.
- UEFI applications use the PE/COFF format and must be relocatable. The
first problem is solved by manually having the PE/COFF headers and
tables written in assembler. The relocatable requirement is addressed
by compiling the code with -fpic and having the bootloader relocate
itself at its startup.
Kernel:
- Kernel code for AArch64 consists mostly of stubbing out various
architecture-specific hooks: virtual memory management, interrupt and
exception handling, context switching (including FPU lazy switching),
support for virtual timer, atomic sequences and barriers, cache and
TLB maintenance, thread and process initialization.
- The patch adds a kernel driver for GICv2 (interrupt controller).
- The PL011 kernel driver is extended to allow userspace to take
ownership of the console.
- The current code is not able to dynamically obtain information about
available devices on the underlying machine. The port instead
implements a machine-func interface similar to the one implemented by
arm32. It defines a machine for the QEMU AArch64 virt platform. The
configuration (device addresses and IRQ numbers) is then baked into
the machine definition.
User space:
- Uspace code for AArch64 similarly mostly implements
architecture-specific hooks: context saving/restoring, syscall
support, TLS support.
The patchset allows to boot the system but user interaction with the OS
is not yet possible.
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Property mode
set to
100644
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File size:
591 bytes
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| 1 | #include <arch/arch.h>
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| 2 |
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| 3 | ENTRY(start)
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| 4 |
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| 5 | SECTIONS {
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| 6 | . = 0x0;
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| 7 | .text : {
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| 8 | HIDDEN(loader_start = .);
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| 9 | *(BOOTSTRAP);
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| 10 | *(.text);
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| 11 | }
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| 12 | .dynamic : { *(.dynamic); }
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| 13 | .rela.got : { *(.rela.got); }
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| 14 | .hash : { *(.hash); }
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| 15 | .dynsym : { *(.dynsym); }
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| 16 | .dynstr : { *(.dynstr); }
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| 17 | . = 0x8000;
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| 18 | .data : {
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| 19 | *(.data*); /* initialized data */
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| 20 | *(.rodata*);
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| 21 | *(.bss); /* uninitialized static variables */
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| 22 | *(COMMON); /* global variables */
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| 23 | *(.got .got.plt);
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| 24 | HIDDEN(loader_end = .);
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| 25 | HIDDEN(payload_start = .);
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| 26 | *(.payload);
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| 27 | HIDDEN(payload_end = .);
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| 28 | }
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| 29 |
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| 30 | /DISCARD/ : {
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| 31 | *(*);
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| 32 | }
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| 33 | }
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