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https://github.com/RGBCube/serenity
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27860cfaa2
This trap handler uses the SBI to print an error message via a newly introduced panic function, which is necessary as `pre_init` is running identity mapped. Also add a header file for `pre_init.cpp` as we wan't to use the panic and `dbgln` function in the MMU init code as well.
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/*
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* Copyright (c) 2023, Sönke Holz <sholz8530@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/riscv64/pre_init.h>
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#include <Kernel/Arch/Processor.h>
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#include <Kernel/Arch/riscv64/MMU.h>
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#include <Kernel/Arch/riscv64/SBI.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT void dbgln_without_mmu(StringView message)
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{
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auto probe_result = SBI::Base::probe_extension(SBI::EID::DebugConsole);
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if (probe_result.is_error() || probe_result.value() == 0) {
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for (auto const ch : message.bytes())
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(void)SBI::Legacy::console_putchar(ch);
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(void)SBI::Legacy::console_putchar('\n');
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} else {
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for (auto const ch : message.bytes())
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(void)SBI::DBCN::debug_console_write_byte(ch);
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(void)SBI::DBCN::debug_console_write_byte('\n');
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}
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}
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[[noreturn]] UNMAP_AFTER_INIT void panic_without_mmu(StringView message)
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{
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dbgln_without_mmu("KERNEL PANIC in pre_init :^("sv);
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dbgln_without_mmu(message);
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// We can't use Processor::halt() here, as that would result in an absolute jump.
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RISCV64::CSR::write(RISCV64::CSR::Address::SIE, 0);
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for (;;)
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asm volatile("wfi");
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}
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[[gnu::aligned(4)]] [[noreturn]] UNMAP_AFTER_INIT static void early_trap_handler()
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{
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panic_without_mmu("Unexpected trap"sv);
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}
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extern "C" [[noreturn]] UNMAP_AFTER_INIT void pre_init(FlatPtr mhartid, PhysicalPtr fdt_phys_addr)
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{
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(void)mhartid;
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(void)fdt_phys_addr;
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// Catch traps in pre_init
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RISCV64::CSR::write(RISCV64::CSR::Address::STVEC, bit_cast<FlatPtr>(&early_trap_handler));
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// FIXME: Implement this
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Processor::halt();
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}
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}
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