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Kernel: Add stubs for missing x86_64 functionality

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

View file

@ -0,0 +1,42 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/Types.h>
#include <Kernel/Arch/x86/CPU.h>
#include <Kernel/Arch/x86/Processor.h>
#include <Kernel/Arch/x86/TrapFrame.h>
#include <Kernel/KSyms.h>
#include <Kernel/Process.h>
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();
}

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@ -485,7 +485,13 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
// to be ebp.
ProcessPagingScope paging_scope(thread.process());
auto& tss = thread.tss();
u32* stack_top = reinterpret_cast<u32*>(tss.esp);
u32* stack_top;
#if ARCH(I386)
stack_top = reinterpret_cast<u32*>(tss.esp);
#else
(void)tss;
TODO();
#endif
if (is_user_range(VirtualAddress(stack_top), sizeof(FlatPtr))) {
if (!copy_from_user(&frame_ptr, &((FlatPtr*)stack_top)[0]))
frame_ptr = 0;
@ -494,7 +500,11 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
if (!safe_memcpy(&frame_ptr, &((FlatPtr*)stack_top)[0], sizeof(FlatPtr), fault_at))
frame_ptr = 0;
}
#if ARCH(I386)
eip = tss.eip;
#else
TODO();
#endif
// TODO: We need to leave the scheduler lock here, but we also
// need to prevent the target thread from being run while
// we walk the stack

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@ -0,0 +1,78 @@
/*
* 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();
}
}