x86, realmode: Move SMP trampoline to unified realmode code
Migrated SMP trampoline code to the real mode blob.
SMP trampoline code is not yet removed from
.x86_trampoline because it is needed by the wakeup
code.
[ hpa: always enable compiling startup_32_smp in head_32.S... it is
only a few instructions which go into .init on UP builds, and it makes
the rest of the code less #ifdef ugly. ]
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-6-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6e1e406..c7971ea 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -57,7 +57,7 @@
#include <asm/nmi.h>
#include <asm/irq.h>
#include <asm/idle.h>
-#include <asm/trampoline.h>
+#include <asm/realmode.h>
#include <asm/cpu.h>
#include <asm/numa.h>
#include <asm/pgtable.h>
@@ -73,6 +73,8 @@
#include <asm/smpboot_hooks.h>
#include <asm/i8259.h>
+#include <asm/realmode.h>
+
/* State of each CPU */
DEFINE_PER_CPU(int, cpu_state) = { 0 };
@@ -662,8 +664,12 @@
*/
static int __cpuinit do_boot_cpu(int apicid, int cpu)
{
+ volatile u32 *trampoline_status =
+ (volatile u32 *) __va(real_mode_header.trampoline_status);
+ /* start_ip had better be page-aligned! */
+ unsigned long start_ip = real_mode_header.trampoline_data;
+
unsigned long boot_error = 0;
- unsigned long start_ip;
int timeout;
struct create_idle c_idle = {
.cpu = cpu,
@@ -713,9 +719,6 @@
initial_code = (unsigned long)start_secondary;
stack_start = c_idle.idle->thread.sp;
- /* start_ip had better be page-aligned! */
- start_ip = trampoline_address();
-
/* So we see what's up */
announce_cpu(cpu, apicid);
@@ -778,8 +781,7 @@
pr_debug("CPU%d: has booted.\n", cpu);
} else {
boot_error = 1;
- if (*(volatile u32 *)TRAMPOLINE_SYM(trampoline_status)
- == 0xA5A5A5A5)
+ if (*trampoline_status == 0xA5A5A5A5)
/* trampoline started but...? */
pr_err("CPU%d: Stuck ??\n", cpu);
else
@@ -805,7 +807,7 @@
}
/* mark "stuck" area as not stuck */
- *(volatile u32 *)TRAMPOLINE_SYM(trampoline_status) = 0;
+ *trampoline_status = 0;
if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
/*