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Kernel: Initialize the CPU to allow SSE on startup.

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I still need to add support for SSE to the context switching code, but now
at least one process can use it.
This commit is contained in:
Andreas Kling 2019-03-27 13:40:00 +01:00
parent 5808322556
commit 750d79dcaf
3 changed files with 16 additions and 0 deletions
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13
Kernel/i386.cpp
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@ -493,3 +493,16 @@ void __assertion_failed(const char* msg, const char* file, unsigned line, const
asm volatile("hlt");
for (;;);
}
void sse_init()
{
asm volatile(
"mov %cr0, %eax\n"
"andl $0xfffffffb, %eax\n"
"orl $0x2, %eax\n"
"mov %eax, %cr0\n"
"mov %cr4, %eax\n"
"orl $0x600, %eax\n"
"mov %eax, %cr4\n"
);
}