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xen64: set up syscall and sysenter entrypoints for 64-bit

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We set up entrypoints for syscall and sysenter.  sysenter is only used
for 32-bit compat processes, whereas syscall can be used in by both 32
and 64-bit processes.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-07-08 15:07:14 -07:00
committed by Ingo Molnar
parent d6182fbf04
commit 6fcac6d305
5 changed files with 174 additions and 5 deletions
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42
arch/x86/xen/setup.c
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@@ -86,9 +86,11 @@ static void xen_idle(void)
*/
static void __init fiddle_vdso(void)
{
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
extern const char vdso32_default_start;
u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
#endif
}
static __cpuinit int register_callback(unsigned type, const void *func)
@@ -106,15 +108,48 @@ void __cpuinit xen_enable_sysenter(void)
{
int cpu = smp_processor_id();
extern void xen_sysenter_target(void);
int ret;
if (!boot_cpu_has(X86_FEATURE_SEP) ||
register_callback(CALLBACKTYPE_sysenter,
xen_sysenter_target) != 0) {
#ifdef CONFIG_X86_32
if (!boot_cpu_has(X86_FEATURE_SEP)) {
return;
}
#else
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL &&
boot_cpu_data.x86_vendor != X86_VENDOR_CENTAUR) {
return;
}
#endif
ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
if(ret != 0) {
clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
}
}
void __cpuinit xen_enable_syscall(void)
{
#ifdef CONFIG_X86_64
int cpu = smp_processor_id();
int ret;
extern void xen_syscall_target(void);
extern void xen_syscall32_target(void);
ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
if (ret != 0) {
printk("failed to set syscall: %d\n", ret);
clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SYSCALL);
clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SYSCALL);
} else {
ret = register_callback(CALLBACKTYPE_syscall32,
xen_syscall32_target);
if (ret != 0)
printk("failed to set 32-bit syscall: %d\n", ret);
}
#endif /* CONFIG_X86_64 */
}
void __init xen_arch_setup(void)
{
struct physdev_set_iopl set_iopl;
@@ -131,6 +166,7 @@ void __init xen_arch_setup(void)
BUG();
xen_enable_sysenter();
xen_enable_syscall();
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);