mirror of
https://github.com/RGBCube/serenity
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bc213ad7a2
For now, this can only query microseconds since boot. Use this to print a timestamp every second. This busy-loops until a second has passed. This might be a good first use of interrupts soon. qemu used to not implement this timer at some point, but it seems to work fine even in qemu now (qemu v 5.2.0).
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Types.h>
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#include <Kernel/Prekernel/Arch/aarch64/Mailbox.h>
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#include <Kernel/Prekernel/Arch/aarch64/Timer.h>
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#include <Kernel/Prekernel/Arch/aarch64/UART.h>
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extern "C" [[noreturn]] void halt();
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extern "C" [[noreturn]] void init();
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extern "C" [[noreturn]] void init()
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{
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auto& uart = Prekernel::UART::the();
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uart.print_str("\r\nWelcome to Serenity OS!\r\n");
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uart.print_str("Imagine this being your ideal operating system.\r\n");
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uart.print_str("Observed deviations from that ideal are shortcomings of your imagination.\r\n\r\n");
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u32 firmware_version = Prekernel::Mailbox::query_firmware_version();
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uart.print_str("Firmware version: ");
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uart.print_num(firmware_version);
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uart.print_str("\r\n");
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auto& timer = Prekernel::Timer::the();
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u64 start_musec = 0;
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for (;;) {
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u64 now_musec;
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while ((now_musec = timer.microseconds_since_boot()) - start_musec < 1'000'000)
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;
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start_musec = now_musec;
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uart.print_str("Timer: ");
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uart.print_num(now_musec);
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uart.print_str("\r\n");
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}
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}
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// FIXME: Share this with the Intel Prekernel.
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extern size_t __stack_chk_guard;
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size_t __stack_chk_guard;
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extern "C" [[noreturn]] void __stack_chk_fail();
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[[noreturn]] void halt()
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{
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for (;;) {
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asm volatile("wfi");
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}
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}
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void __stack_chk_fail()
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{
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halt();
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}
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[[noreturn]] void __assertion_failed(char const*, char const*, unsigned int, char const*)
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{
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halt();
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}
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