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Kernel: Clean up MemoryManager initialization a bit more

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Move the CPU feature enabling to functions in Arch/i386/CPU.cpp.
This commit is contained in:
Andreas Kling 2020-01-17 23:56:13 +01:00
parent 6b52f6c61d
commit 3e8b60c618
4 changed files with 94 additions and 90 deletions
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77
Kernel/Arch/i386/CPU.cpp
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@ -570,7 +570,6 @@ void detect_cpu_features()
g_cpu_supports_umip = (extended_features.ecx() & (1 << 2));
}
void stac()
{
if (!g_cpu_supports_smap)
@ -586,3 +585,79 @@ void clac()
asm volatile("clac" ::
: "cc");
}
void x86_enable_pae()
{
// Turn on CR4.PAE
asm volatile(
"mov %cr4, %eax\n"
"orl $0x20, %eax\n"
"mov %eax, %cr4\n");
}
void x86_enable_pge()
{
if (g_cpu_supports_pge) {
// Turn on CR4.PGE so the CPU will respect the G bit in page tables.
asm volatile(
"mov %cr4, %eax\n"
"orl $0x80, %eax\n"
"mov %eax, %cr4\n");
kprintf("x86: PGE support enabled\n");
} else {
kprintf("x86: PGE support not detected\n");
}
}
void x86_enable_smep()
{
if (g_cpu_supports_smep) {
// Turn on CR4.SMEP
asm volatile(
"mov %cr4, %eax\n"
"orl $0x100000, %eax\n"
"mov %eax, %cr4\n");
kprintf("x86: SMEP support enabled\n");
} else {
kprintf("x86: SMEP support not detected\n");
}
}
void x86_enable_smap()
{
if (g_cpu_supports_smap) {
// Turn on CR4.SMAP
kprintf("x86: Enabling SMAP\n");
asm volatile(
"mov %cr4, %eax\n"
"orl $0x200000, %eax\n"
"mov %eax, %cr4\n");
kprintf("x86: SMAP support enabled\n");
} else {
kprintf("x86: SMAP support not detected\n");
}
}
void x86_enable_nx()
{
if (g_cpu_supports_nx) {
// Turn on IA32_EFER.NXE
asm volatile(
"movl $0xc0000080, %ecx\n"
"rdmsr\n"
"orl $0x800, %eax\n"
"wrmsr\n");
kprintf("x86: NX support enabled\n");
} else {
kprintf("x86: NX support not detected\n");
}
}
void x86_enable_wp()
{
asm volatile(
"movl %%cr0, %%eax\n"
"orl $0x00010000, %%eax\n"
"movl %%eax, %%cr0\n" ::
: "%eax", "memory");
}