Changeset 84176f3 in mainline for abi/include

Timestamp:

2019-04-10T15:04:17Z (7 years ago)

Author:

Jakub Jermář <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8df0306

Parents:

b58728f

git-author:

Petr Pavlu <setup@…> (2019-03-31 14:09:57)

git-committer:

Jakub Jermář <jakub@…> (2019-04-10 15:04:17)

Message:

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.

File:

• abi/include/abi/elf.h (modified) (3 diffs)

abi/include/abi/elf.h

@@ -77 +77 @@
         EM_IA_64       = 50,   /* IA-64 */
         EM_X86_64      = 62,   /* AMD64/EMT64 */
+        EM_AARCH64     = 183,  /* ARM 64-bit architecture */
         EM_RISCV       = 243,  /* RISC-V */
 };
@@ -515 +516 @@
 typedef struct elf32_rel elf_rel_t;
 typedef struct elf32_rela elf_rela_t;
+#define ELF_R_TYPE(i)  ELF32_R_TYPE(i)
 #endif
 
@@ -526 +528 @@
 typedef struct elf64_rel elf_rel_t;
 typedef struct elf64_rela elf_rela_t;
+#define ELF_R_TYPE(i)  ELF64_R_TYPE(i)
 #endif