OpenSBI: Added timer extension
NOTE: I didn't switch to the new functions in the kernel because for some reason we get a page fault when trying to fetch the first instruction of set_timer(addi sp, sp, -48). I doubt this is related to the set_timer funcion itself and is instead some kind of paging or linking problem because it works fine with paging disabled and really just doesnt make sense.
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3 changed files with 39 additions and 1 deletions
25
kernel/drivers/opensbi/extensions/timer.cpp
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kernel/drivers/opensbi/extensions/timer.cpp
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#include "opensbi/extensions/timer.h"
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namespace drivers {
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namespace opensbi::timer {
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namespace {
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enum class ExtensionId {
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TIMER = 0x54494D45
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};
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enum class FunctionId {
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SET_TIMER,
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};
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}
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SbiRet set_timer(uint64_t stime_value) {
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return ecall(
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static_cast<sbiword_t>(ExtensionId::TIMER),
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static_cast<sbiword_t>(FunctionId::SET_TIMER),
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stime_value);
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}
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} // End namespace opensbi::timer
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} // End namespace drivers
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11
kernel/drivers/opensbi/include/opensbi/extensions/timer.h
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kernel/drivers/opensbi/include/opensbi/extensions/timer.h
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#pragma once
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#include "opensbi/opensbi.h"
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namespace drivers {
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namespace opensbi::timer {
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SbiRet set_timer(uint64_t stime_value);
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} // End namespace opensbi::timer
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} // End namespace drivers
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@ -1,7 +1,9 @@
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kernel_sources += [
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kernel_sources += [
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files(
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files(
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'opensbi.cpp',
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'opensbi.cpp',
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'extensions/legacy.cpp'
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'extensions/legacy.cpp',
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'extensions/base.cpp',
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'extensions/timer.cpp'
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),
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),
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]
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]
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