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Kernel: Add stubs for missing x86_64 functionality

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This adds just enough stubs to make the kernel compile on x86_64. Obviously
it won't do anything useful - in fact it won't even attempt to boot because
Multiboot doesn't support ELF64 binaries - but it gets those compiler errors
out of the way so more progress can be made getting all the missing
functionality in place.
This commit is contained in:
Gunnar Beutner 2021-06-23 21:54:41 +02:00 • committed by Andreas Kling
parent f2eb759901
commit 38fca26f54
21 changed files with 295 additions and 40 deletions
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29
Kernel/Arch/x86/i386/CPU.cpp
View file

@ -101,32 +101,3 @@ extern "C" u32 do_init_context(Thread* thread, u32 flags)
}
}
void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func)
{
asm volatile("cli");
critical_dmesgln("ASSERTION FAILED: {}", msg);
critical_dmesgln("{}:{} in {}", file, line, func);
abort();
}
[[noreturn]] void abort()
{
// Switch back to the current process's page tables if there are any.
// Otherwise stack walking will be a disaster.
auto process = Process::current();
if (process)
MM.enter_process_paging_scope(*process);
Kernel::dump_backtrace();
Processor::halt();
abort();
}
[[noreturn]] void _abort()
{
asm volatile("ud2");
__builtin_unreachable();
}

1
Kernel/Arch/x86/i386/InterruptEntry.cpp
View file

@ -6,6 +6,7 @@
#include <Kernel/Arch/x86/DescriptorTable.h>
#include <Kernel/Arch/x86/TrapFrame.h>
// clang-format off
asm(
".globl interrupt_common_asm_entry\n"

2
Kernel/Arch/x86/i386/Processor.cpp
View file

@ -37,7 +37,6 @@ asm(
);
// clang-format on
#if ARCH(I386)
// clang-format off
asm(
".global do_assume_context \n"
@ -59,7 +58,6 @@ asm(
" jmp enter_thread_context \n"
);
// clang-format on
#endif
String Processor::platform_string() const
{

78
Kernel/Arch/x86/i386/ProcessorInfo.cpp
View file

@ -1,78 +0,0 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <AK/Types.h>
#include <Kernel/Arch/x86/CPUID.h>
#include <Kernel/Arch/x86/Processor.h>
#include <Kernel/Arch/x86/ProcessorInfo.h>
namespace Kernel {
ProcessorInfo::ProcessorInfo(Processor& processor)
: m_processor(processor)
{
u32 max_leaf;
{
CPUID cpuid(0);
StringBuilder builder;
auto emit_u32 = [&](u32 value) {
builder.appendff("{:c}{:c}{:c}{:c}",
value & 0xff,
(value >> 8) & 0xff,
(value >> 16) & 0xff,
(value >> 24) & 0xff);
};
max_leaf = cpuid.eax();
emit_u32(cpuid.ebx());
emit_u32(cpuid.edx());
emit_u32(cpuid.ecx());
m_cpuid = builder.build();
}
{
VERIFY(max_leaf >= 1);
CPUID cpuid(1);
m_stepping = cpuid.eax() & 0xf;
u32 model = (cpuid.eax() >> 4) & 0xf;
u32 family = (cpuid.eax() >> 8) & 0xf;
m_type = (cpuid.eax() >> 12) & 0x3;
u32 extended_model = (cpuid.eax() >> 16) & 0xf;
u32 extended_family = (cpuid.eax() >> 20) & 0xff;
if (family == 15) {
m_display_family = family + extended_family;
m_display_model = model + (extended_model << 4);
} else if (family == 6) {
m_display_family = family;
m_display_model = model + (extended_model << 4);
} else {
m_display_family = family;
m_display_model = model;
}
}
u32 max_extended_leaf = CPUID(0x80000000).eax();
if (max_extended_leaf >= 0x80000004) {
alignas(u32) char buffer[48];
u32* bufptr = reinterpret_cast<u32*>(buffer);
auto copy_brand_string_part_to_buffer = [&](u32 i) {
CPUID cpuid(0x80000002 + i);
*bufptr++ = cpuid.eax();
*bufptr++ = cpuid.ebx();
*bufptr++ = cpuid.ecx();
*bufptr++ = cpuid.edx();
};
copy_brand_string_part_to_buffer(0);
copy_brand_string_part_to_buffer(1);
copy_brand_string_part_to_buffer(2);
m_brandstr = buffer;
}
// Cache the CPU feature string
m_features = m_processor.features_string();
}
}