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authorIgor Mammedov <imammedo@redhat.com>2012-07-23 15:22:27 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2012-08-01 08:45:06 -0500
commitdd673288a8ff73ad77fcc1c255486d2466a772e1 (patch)
tree57efd58332d97309c098f7862c44bb947aa73d98 /target-i386/cpu.c
parentfb5b0c6d5cea2d05a5e4e81390a4b6c4c70c6668 (diff)
target-i386: move cpu halted decision into x86_cpu_reset
MP initialization protocol differs between cpu families, and for P6 and onward models it is up to CPU to decide if it will be BSP using this protocol, so try to model this. However there is no point in implementing MP initialization protocol in qemu. Thus first CPU is always marked as BSP. This patch: - moves decision to designate BSP from board into cpu, making cpu self-sufficient in this regard. Later it will allow to cleanup hw/pc.c and remove cpu_reset and wrappers from there. - stores flag that CPU is BSP in IA32_APIC_BASE to model behavior described in Inted SDM vol 3a part 1 chapter 8.4.1 - uses MSR_IA32_APICBASE_BSP flag in apic_base for checking if cpu is BSP patch is based on Jan Kiszka's proposal: http://thread.gmane.org/gmane.comp.emulators.qemu/100806 Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'target-i386/cpu.c')
-rw-r--r--target-i386/cpu.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 6b9659f9e7..365c2ffae9 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1686,8 +1686,24 @@ static void x86_cpu_reset(CPUState *s)
env->dr[7] = DR7_FIXED_1;
cpu_breakpoint_remove_all(env, BP_CPU);
cpu_watchpoint_remove_all(env, BP_CPU);
+
+#if !defined(CONFIG_USER_ONLY)
+ /* We hard-wire the BSP to the first CPU. */
+ if (env->cpu_index == 0) {
+ apic_designate_bsp(env->apic_state);
+ }
+
+ env->halted = !cpu_is_bsp(cpu);
+#endif
}
+#ifndef CONFIG_USER_ONLY
+bool cpu_is_bsp(X86CPU *cpu)
+{
+ return cpu_get_apic_base(cpu->env.apic_state) & MSR_IA32_APICBASE_BSP;
+}
+#endif
+
static void mce_init(X86CPU *cpu)
{
CPUX86State *cenv = &cpu->env;