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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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8
Kernel/Process.cpp
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@@ -258,6 +258,9 @@ Process* Process::fork(RegisterDump& regs)
child->m_tss.gs = regs.gs;
child->m_tss.ss = regs.ss_if_crossRing;
child->m_fpu_state = m_fpu_state;
child->m_has_used_fpu = m_has_used_fpu;
#ifdef FORK_DEBUG
dbgprintf("fork: child will begin executing at %w:%x with stack %w:%x\n", child->m_tss.cs, child->m_tss.eip, child->m_tss.ss, child->m_tss.esp);
#endif
@@ -588,6 +591,8 @@ Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring
, m_tty(tty)
, m_ppid(ppid)
{
memset(&m_fpu_state, 0, sizeof(FPUState));
m_gids.set(m_gid);
if (fork_parent) {
@@ -698,6 +703,9 @@ Process::~Process()
ProcFS::the().remove_process(*this);
system.nprocess--;
if (g_last_fpu_process == this)
g_last_fpu_process = nullptr;
if (selector())
gdt_free_entry(selector());