source: mainline/uspace/lib/c/arch/arm64/include/libarch/fibril.h

Last change on this file was 84176f3, checked in by Jakub Jermář <jakub@…>, 6 years ago

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.

  • Property mode set to 100644
File size: 2.4 KB
Line 
1/*
2 * Copyright (c) 2015 Petr Pavlu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libcarm64
30 * @{
31 */
32/** @file
33 * @brief Fibrils related declarations.
34 */
35
36#ifndef _LIBC_arm64_FIBRIL_H_
37#define _LIBC_arm64_FIBRIL_H_
38
39#include <types/common.h>
40#include <align.h>
41#include <libarch/fibril_context.h>
42
43/** Size of a stack item. */
44#define STACK_ITEM_SIZE 8
45
46/** Required stack alignment. */
47#define STACK_ALIGNMENT 16
48
49#define SP_DELTA (0 + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT))
50
51/** Sets data to the context.
52 *
53 * @param c Context (#context_t).
54 * @param _pc Program counter.
55 * @param stack Stack address.
56 * @param size Stack size.
57 * @param ptls Pointer to the TCB.
58 */
59#define context_set(c, _pc, stack, size, ptls) \
60 do { \
61 (c)->pc = (uint64_t) (_pc); \
62 (c)->sp = ((uint64_t) (stack)) + (size) - SP_DELTA; \
63 (c)->tls = ((uint64_t) (ptls)) + ARCH_TP_OFFSET; \
64 /* Set frame pointer too. */ \
65 (c)->x29 = 0; \
66 } while (0)
67
68static inline uintptr_t _context_get_fp(context_t *ctx)
69{
70 return ctx->x29;
71}
72
73#endif
74
75/** @}
76 */
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