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Enable CPU features like SSE

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This commit is contained in:
Alex 2022-10-12 02:29:30 +03:00
parent d4c385c128
commit 703de2c284
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 46 additions and 0 deletions
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Kernel.cpp
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@ -60,8 +60,54 @@ EXTERNC void Entry(BootInfo *Info)
KPrint("Time: \e8888FF%02d:%02d:%02d %02d/%02d/%02d UTC",
BootClock.Hour, BootClock.Minute, BootClock.Second,
BootClock.Day, BootClock.Month, BootClock.Year);
KPrint("CPU: \e8822AA%s \e8888FF%s (\e058C19%s\e8888FF)", CPU::Vendor(), CPU::Name(), CPU::Hypervisor());
KPrint("Initializing GDT and IDT");
Interrupts::Initialize();
KPrint("Initializing CPU features");
#if defined(__amd64__)
CPU::x64::CR0 cr0 = CPU::x64::readcr0();
CPU::x64::CR4 cr4 = CPU::x64::readcr4();
uint32_t rax, rbx, rcx, rdx;
CPU::x64::cpuid(1, &rax, &rbx, &rcx, &rdx);
if (rdx & CPU::x64::CPUID_FEAT_RDX_SSE)
{
debug("Enabling SSE support...");
KPrint("SSE is supported.");
cr0.EM = 0;
cr0.MP = 1;
cr4.OSFXSR = 1;
cr4.OSXMMEXCPT = 1;
}
// Enable cpu cache but... how to use it?
cr0.NW = 0;
cr0.CD = 0;
debug("Enabling UMIP, SMEP & SMAP support...");
CPU::x64::cpuid(1, &rax, &rbx, &rcx, &rdx);
if (rdx & CPU::x64::CPUID_FEAT_RDX_UMIP)
{
KPrint("UMIP is supported.");
fixme("Not going to enable UMIP.");
// cr4.UMIP = 1;
}
if (rdx & CPU::x64::CPUID_FEAT_RDX_SMEP)
{
KPrint("SMEP is supported.");
cr4.SMEP = 1;
}
if (rdx & CPU::x64::CPUID_FEAT_RDX_SMAP)
{
KPrint("SMAP is supported.");
cr4.SMAP = 1;
}
CPU::x64::writecr0(cr0);
CPU::x64::writecr4(cr4);
debug("Enabling PAT support...");
CPU::x64::wrmsr(CPU::x64::MSR_CR_PAT, 0x6 | (0x0 << 8) | (0x1 << 16));
#elif defined(__i386__)
#elif defined(__aarch64__)
#endif
KPrint("Loading kernel symbols");
KernelSymbolTable = new SymbolResolver::Symbols((uint64_t)Info->Kernel.FileBase);
KPrint("Initializing Power Manager");