genode

History

Stefan Kalkowski 6d48b5484d hw: correct the ARM cache maintainance operations This commit fixes the following issues regarding cache maintainance under ARM: * read out I-, and D-cache line size at runtime and use the correct one * remove 'update_data_region' call from unprivileged syscalls * rename 'update_instr_region' syscall to 'cache_coherent_region' to reflect what it doing, namely make I-, and D-cache coherent * restrict 'cache_coherent_region' syscall to one page at a time * lookup the region given in a 'cache_coherent_region' syscall in the page-table of the PD to prevent machine exceptions in the kernel * only clean D-cache lines, do not invalidate them when pages where added on Cortex-A8 and ARMv6 (MMU sees phys. memory here) * remove unused code relicts of cache maintainance In addition it introduces per architecture memory clearance functions used by core, when preparing new dataspaces. Thereby, it optimizes: * on ARMv7 using per-word assignments * on ARMv8 using cacheline zeroing * on x86_64 using 'rept stosq' assembler instruction Fix #3685		2020-03-26 11:38:55 +01:00
..
etc	tools.conf: fix check for arm_64	2019-11-19 14:17:29 +01:00
include	hw: correct the ARM cache maintainance operations	2020-03-26 11:38:55 +01:00
lib	base: add mutex as derivate of lock	2020-02-20 12:11:22 +01:00
mk	base-linux: configurable host toolchain	2019-12-19 17:01:42 +01:00
ports	base: add uboot for imx8 as port	2019-12-19 17:01:42 +01:00
recipes	depot: update recipe hashes	2020-02-28 08:59:43 +01:00
run	base: add imx8 evk usb driver to platform config	2019-12-19 17:00:47 +01:00
src	base: remove diagnostic message in destructor	2020-02-27 14:46:59 +01:00
xsd	base_types.xsd: allow session labels of length 0	2018-11-16 14:37:19 +01:00
README	core: add information about infos provided by core	2017-06-29 11:59:52 +02:00

README

This is generic part of the Genode implementation. It consists of two parts:

:_Core_: is the ultimate root of the Genode application tree
  and provides abstractions for the lowest-level hardware resources
  such as RAM, ROM, CPU, and generic device access. All generic parts of Core
  can be found here - for system-specific implementations refer to the
  appropriate 'base-<system>' directory.

:_Base libraries and protocols_: that are used by each Genode component
  to interact with other components. This is the glue that holds everything
  together.

_Core_ may export information about the hardware platform by an ROM
called 'platform_info'. Depending on the platform, e.g. ARM or x86 or riscv,
and depending on the boot mode and boot loader and kernel, some nodes may not
be populated.

!<platform_info>
! <acpi revision="2" rsdt="0x1fe93074" xsdt="0x1fe930e8"/>
! <boot>
!   <framebuffer phys="0x7300000" width="1024" height="768" bpp="32"/>
! </boot>
!</platform_info>

If the ACPI RSDT and XSDT physical pointer is reported by the used kernel
and/or bootloader, _Core_ may provide this information by the ROM.

If the graphic device is initialised and can be directly used by a framebuffer
driver, _Core_ may provide the physical pointer to the framebuffer, the
resolution and color depth in bits.