lfn
serial
ticket/834-toolchain-update
topic/msim-upgrade
topic/simplify-dev-export
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Last change
on this file since 2fff3c4 was 84176f3, checked in by Jakub Jermář <jakub@…>, 6 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
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100644
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File size:
1.3 KB
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| 1 | /*
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| 2 | * ARM64 linker script
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| 3 | *
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| 4 | * kernel text
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| 5 | * kernel data
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| 6 | *
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| 7 | */
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| 8 |
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| 9 | #include <arch/boot/boot.h>
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| 10 | #include <arch/mm/km.h>
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| 11 |
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| 12 | #define LOAD_ADDRESS_V (KM_ARM64_IDENTITY_START + BOOT_OFFSET)
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| 13 | #define LOAD_ADDRESS_P BOOT_OFFSET
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| 14 |
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| 15 | OUTPUT_ARCH(aarch64)
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| 16 | ENTRY(kernel_image_start)
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| 17 |
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| 18 | SECTIONS {
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| 19 | kernel_load_address = LOAD_ADDRESS_V;
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| 20 |
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| 21 | .image (LOAD_ADDRESS_V + SIZEOF_HEADERS) : AT (LOAD_ADDRESS_P + SIZEOF_HEADERS) {
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| 22 | . = ALIGN(16);
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| 23 | ktext_start = .;
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| 24 | *(K_TEXT_START)
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| 25 | *(.text .text.*);
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| 26 | ktext_end = .;
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| 27 |
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| 28 | kdata_start = .;
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| 29 | *(K_DATA_START)
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| 30 | *(.data); /* initialized data */
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| 31 | *(.bss); /* uninitialized static variables */
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| 32 | *(COMMON); /* global variables */
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| 33 |
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| 34 | *(.rodata*);
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| 35 | . = ALIGN(8);
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| 36 | symbol_table = .;
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| 37 | *(symtab.*);
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| 38 |
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| 39 | kdata_end = .;
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| 40 | }
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| 41 |
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| 42 | #ifdef CONFIG_LINE_DEBUG
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| 43 | .comment 0 : { *(.comment); }
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| 44 | .debug_abbrev 0 : { *(.debug_abbrev); }
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| 45 | .debug_aranges 0 : { *(.debug_aranges); }
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| 46 | .debug_frame 0 : { *(.debug_frame); }
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| 47 | .debug_info 0 : { *(.debug_info); }
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| 48 | .debug_line 0 : { *(.debug_line); }
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| 49 | .debug_loc 0 : { *(.debug_loc); }
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| 50 | .debug_macinfo 0 : { *(.debug_macinfo); }
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| 51 | .debug_pubnames 0 : { *(.debug_pubnames); }
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| 52 | .debug_pubtypes 0 : { *(.debug_pubtypes); }
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| 53 | .debug_ranges 0 : { *(.debug_ranges); }
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| 54 | .debug_str 0 : { *(.debug_str); }
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| 55 | #endif
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| 56 |
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| 57 | /DISCARD/ : {
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| 58 | *(*);
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| 59 | }
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| 60 | }
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