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Kernel: Implement lazy FPU state restore.

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This commit is contained in:
Andreas Kling 2019-01-25 07:52:44 +01:00
parent 2279f5eaa6
commit dfdca9d2a7
8 changed files with 50 additions and 9 deletions
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26
Kernel/i386.cpp
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@ -6,6 +6,7 @@
#include "MemoryManager.h"
#include "IRQHandler.h"
#include "PIC.h"
#include "Scheduler.h"
//#define PAGE_FAULT_DEBUG
@ -150,13 +151,31 @@ void exception_6_handler(RegisterDump& regs)
current->crash();
}
// 7: FPU exception
// 7: FPU not available exception
EH_ENTRY_NO_CODE(7);
void exception_7_handler(RegisterDump& regs)
{
(void)regs;
asm volatile("clts");
if (g_last_fpu_process == current)
return;
if (g_last_fpu_process) {
asm volatile("fnsave %0":"=m"(g_last_fpu_process->fpu_state()));
} else {
asm volatile("fnclex");
}
g_last_fpu_process = current;
if (current->has_used_fpu()) {
asm volatile("frstor %0"::"m"(current->fpu_state()));
} else {
asm volatile("fninit");
current->set_has_used_fpu(true);
}
#ifdef FPU_EXCEPTION_DEBUG
kprintf("%s FPU exception: %u(%s)\n", current->isRing0() ? "Kernel" : "Process", current->pid(), current->name().characters());
kprintf("%s FPU not available exception: %u(%s)\n", current->isRing0() ? "Kernel" : "Process", current->pid(), current->name().characters());
word ss;
dword esp;
@ -173,9 +192,6 @@ void exception_7_handler(RegisterDump& regs)
kprintf("eax=%x ebx=%x ecx=%x edx=%x\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
kprintf("ebp=%x esp=%x esi=%x edi=%x\n", regs.ebp, esp, regs.esi, regs.edi);
#endif
// FIXME: Do stuff.
asm volatile("clts");
}