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ia64/pv_ops/xen: define xen pv_cpu_ops. 

define xen pv_cpu_ops which implementes xen paravirtualized
privileged instructions.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2008-10-17 11:18:00 +09:00 committed by Tony Luck
parent b5a26e4db8
commit 4b83ce4367
1 changed files with 114 additions and 0 deletions
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114
arch/ia64/xen/xen_pv_ops.c
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@ -162,6 +162,119 @@ static const struct pv_init_ops xen_init_ops __initdata = {
.post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
};
/***************************************************************************
* pv_cpu_ops
* intrinsics hooks.
*/
static void xen_setreg(int regnum, unsigned long val)
{
switch (regnum) {
case _IA64_REG_AR_KR0 ... _IA64_REG_AR_KR7:
xen_set_kr(regnum - _IA64_REG_AR_KR0, val);
break;
#ifdef CONFIG_IA32_SUPPORT
case _IA64_REG_AR_EFLAG:
xen_set_eflag(val);
break;
#endif
case _IA64_REG_CR_TPR:
xen_set_tpr(val);
break;
case _IA64_REG_CR_ITM:
xen_set_itm(val);
break;
case _IA64_REG_CR_EOI:
xen_eoi(val);
break;
default:
ia64_native_setreg_func(regnum, val);
break;
}
}
static unsigned long xen_getreg(int regnum)
{
unsigned long res;
switch (regnum) {
case _IA64_REG_PSR:
res = xen_get_psr();
break;
#ifdef CONFIG_IA32_SUPPORT
case _IA64_REG_AR_EFLAG:
res = xen_get_eflag();
break;
#endif
case _IA64_REG_CR_IVR:
res = xen_get_ivr();
break;
case _IA64_REG_CR_TPR:
res = xen_get_tpr();
break;
default:
res = ia64_native_getreg_func(regnum);
break;
}
return res;
}
/* turning on interrupts is a bit more complicated.. write to the
* memory-mapped virtual psr.i bit first (to avoid race condition),
* then if any interrupts were pending, we have to execute a hyperprivop
* to ensure the pending interrupt gets delivered; else we're done! */
static void
xen_ssm_i(void)
{
int old = xen_get_virtual_psr_i();
xen_set_virtual_psr_i(1);
barrier();
if (!old && xen_get_virtual_pend())
xen_hyper_ssm_i();
}
/* turning off interrupts can be paravirtualized simply by writing
* to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
static void
xen_rsm_i(void)
{
xen_set_virtual_psr_i(0);
barrier();
}
static unsigned long
xen_get_psr_i(void)
{
return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
}
static void
xen_intrin_local_irq_restore(unsigned long mask)
{
if (mask & IA64_PSR_I)
xen_ssm_i();
else
xen_rsm_i();
}
static const struct pv_cpu_ops xen_cpu_ops __initdata = {
.fc = xen_fc,
.thash = xen_thash,
.get_cpuid = xen_get_cpuid,
.get_pmd = xen_get_pmd,
.getreg = xen_getreg,
.setreg = xen_setreg,
.ptcga = xen_ptcga,
.get_rr = xen_get_rr,
.set_rr = xen_set_rr,
.set_rr0_to_rr4 = xen_set_rr0_to_rr4,
.ssm_i = xen_ssm_i,
.rsm_i = xen_rsm_i,
.get_psr_i = xen_get_psr_i,
.intrin_local_irq_restore
= xen_intrin_local_irq_restore,
};
/***************************************************************************
* pv_ops initialization
*/
@ -172,4 +285,5 @@ xen_setup_pv_ops(void)
xen_info_init();
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_cpu_ops = xen_cpu_ops;
}