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base: introduce platform_init function

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The new 'init_platform' function performs the platform-specific
component-local low-level initialization. It allows for the
differentiation between core and regular components as well as
kernel-dependent peculiarities.

This patch introduces a consistent notion of a 'Platform'. Within core,
the 'Platform' contains the kernel-specific initialization. Outside
core, the platform sets up the interplay with the parent component. In
all cases, the platform is constructed while running on the initial
stack.

Issue #4784
This commit is contained in:
Norman Feske
2023-03-10 16:50:25 +01:00
parent 9e0ef550a8
commit 61926ebc07
29 changed files with 470 additions and 568 deletions
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13
repos/base/src/core/main.cc
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@ -87,6 +87,9 @@ Platform &Core::platform_specific()
Platform_generic &Core::platform() { return platform_specific(); }
void Genode::init_platform() { core_env(); }
Thread_capability Genode::main_thread_cap() { return Thread_capability(); }
@ -185,12 +188,10 @@ class Core_child : public Child_policy
****************/
/*
* In contrast to the 'Platform_env' used by non-core components, core disables
* the signal thread but overriding 'Genode::init_signal_thread' with a dummy.
* Within core, the signal thread is not needed as core is never supposed to
* receive any signals. Otherwise, the signal thread would be the only
* non-entrypoint thread within core, which would be a problem on NOVA where
* the creation of regular threads within core is unsupported.
* In contrast to non-core components, core disables the signal thread by
* overriding 'Genode::init_signal_thread' with a dummy. Within core, the
* signal thread is not needed as core is never supposed to receive any
* signals.
*/
void Genode::init_signal_thread(Env &) { }