/*
* Now we can look at each of the routines this calls, in increasing order of
* complexity: do_hypercalls(), emulate_insn(), maybe_do_interrupt(),
* deliver_trap() and demand_page(). After all those, we'll be ready to
* examine the Switcher, and our philosophical understanding of the Host/Guest
* duality will be complete.
:*/
static void adjust_pge(void *on)
{
if (on)
cr4_set_bits(X86_CR4_PGE);
else
cr4_clear_bits(X86_CR4_PGE);
}
static void enable_TSC(void)
{
preempt_disable();
if (test_and_clear_thread_flag(TIF_NOTSC))
/*
* Must flip the CPU state synchronously with
* TIF_NOTSC in the current running context.
*/
cr4_clear_bits(X86_CR4_TSD);
preempt_enable();
}
static void hard_enable_TSC(void)
{
cr4_clear_bits(X86_CR4_TSD);
}
/*
* We enabled the XSAVE hardware, but something went wrong and
* we can not use it. Disable it.
*/
static void fpu__init_disable_system_xstate(void)
{
xfeatures_mask = 0;
cr4_clear_bits(X86_CR4_OSXSAVE);
fpu__xstate_clear_all_cpu_caps();
}
