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platform_drv: respond to <system state="reset"/>

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If 'system="yes"' is specified in the <config>, the platform driver now
monitors the content of the system ROM. Should the value become "reset",
a reset is triggered using information obtained from the ACPI driver.

Related to issue #2726
This commit is contained in:
Norman Feske 2021-03-29 17:40:17 +02:00
parent 9f8c555e7d
commit 2c7c7767fc
1 changed files with 42 additions and 0 deletions
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42
repos/os/src/drivers/platform/spec/x86/main.cc
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@ -54,6 +54,8 @@ struct Platform::Main
bool const _acpi_platform;
bool _acpi_ready = false;
void _attempt_acpi_reset();
void acpi_update()
{
if (!root.constructed()) {
@ -114,6 +116,19 @@ struct Platform::Main
if (!root_cap.valid())
acpi_update();
bool const system_state_was_constructed = system_state.constructed();
system_state.conditional(_config.xml().attribute_value("system", false),
_env, "system");
if (system_state.constructed() && !system_state_was_constructed)
system_state->sigh(_config_handler);
if (system_state.constructed()) {
system_state->update();
if (system_state->xml().attribute_value("state", String<16>()) == "reset")
_attempt_acpi_reset();
}
if (root.constructed()) {
root->generate_pci_report();
@ -154,13 +169,40 @@ struct Platform::Main
/* wait for the first valid acpi report */
acpi_rom.construct(env, "acpi");
acpi_rom->sigh(_acpi_report);
/* check if already valid */
config_update();
acpi_update();
system_update();
}
};
void Platform::Main::_attempt_acpi_reset()
{
using namespace Genode;
if (!acpi_rom.constructed())
return;
acpi_rom->xml().with_sub_node("reset", [&] (Xml_node reset) {
uint16_t const io_port = reset.attribute_value("io_port", (uint16_t)0);
uint8_t const value = reset.attribute_value("value", (uint8_t)0);
log("trigger reset by writing value ", value, " to I/O port ", Hex(io_port));
try {
Io_port_connection reset_port { _env, io_port, 1 };
reset_port.outb(io_port, value);
}
catch (...) {
error("unable to access reset I/O port ", Hex(io_port));
}
});
}
void Component::construct(Genode::Env &env)
{
/* XXX execute constructors of global statics */