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From: Glauber Costa <gcosta@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, glommer@gmail.com, mingo@elte.hu,
	tglx@linutronix.de, Glauber Costa <gcosta@redhat.com>
Subject: [PATCH 44/52] unify setup_trampoline
Date: Mon,  3 Mar 2008 14:13:12 -0300	[thread overview]
Message-ID: <1204564400-17636-45-git-send-email-gcosta@redhat.com> (raw)
In-Reply-To: <1204564400-17636-44-git-send-email-gcosta@redhat.com>

setup_trampoline() looks very similar between architectures, and this
patch unifies them. The i386 version allocates bootmem memory, while
the x86_64 version uses a fixed address.

In this patch, we initialize the global trampoline_base to the x86_64 version,
and i386 allocation can later override it.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
---
 arch/x86/kernel/smpboot.c    |   33 +++++++++++++++++++++++++++++++++
 arch/x86/kernel/smpboot_32.c |   29 -----------------------------
 arch/x86/kernel/smpboot_64.c |   14 --------------
 include/asm-x86/smp.h        |    4 ++++
 include/asm-x86/smp_64.h     |    2 --
 5 files changed, 37 insertions(+), 45 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 34c3117..b13b9d5 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -3,6 +3,7 @@
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/percpu.h>
+#include <linux/bootmem.h>
 
 #include <asm/nmi.h>
 #include <asm/irq.h>
@@ -38,6 +39,9 @@ EXPORT_PER_CPU_SYMBOL(cpu_core_map);
 DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
 EXPORT_PER_CPU_SYMBOL(cpu_info);
 
+/* ready for x86_64, no harm for x86, since it will overwrite after alloc */
+unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE);
+
 /* representing cpus for which sibling maps can be computed */
 static cpumask_t cpu_sibling_setup_map;
 
@@ -117,6 +121,35 @@ cpumask_t cpu_coregroup_map(int cpu)
 		return c->llc_shared_map;
 }
 
+/*
+ * Currently trivial. Write the real->protected mode
+ * bootstrap into the page concerned. The caller
+ * has made sure it's suitably aligned.
+ */
+
+unsigned long __cpuinit setup_trampoline(void)
+{
+	memcpy(trampoline_base, trampoline_data,
+	       trampoline_end - trampoline_data);
+	return virt_to_phys(trampoline_base);
+}
+
+#ifdef CONFIG_X86_32
+/*
+ * We are called very early to get the low memory for the
+ * SMP bootup trampoline page.
+ */
+void __init smp_alloc_memory(void)
+{
+	trampoline_base = alloc_bootmem_low_pages(PAGE_SIZE);
+	/*
+	 * Has to be in very low memory so we can execute
+	 * real-mode AP code.
+	 */
+	if (__pa(trampoline_base) >= 0x9F000)
+		BUG();
+}
+#endif
 
 #ifdef CONFIG_HOTPLUG_CPU
 void remove_siblinginfo(int cpu)
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index a21f254..ee82659 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -73,41 +73,12 @@ EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
 
 u8 apicid_2_node[MAX_APICID];
 
-static unsigned char *trampoline_base;
-
 static void map_cpu_to_logical_apicid(void);
 
 /* State of each CPU. */
 DEFINE_PER_CPU(int, cpu_state) = { 0 };
 
 /*
- * Currently trivial. Write the real->protected mode
- * bootstrap into the page concerned. The caller
- * has made sure it's suitably aligned.
- */
-
-static unsigned long __cpuinit setup_trampoline(void)
-{
-	memcpy(trampoline_base, trampoline_data, trampoline_end - trampoline_data);
-	return virt_to_phys(trampoline_base);
-}
-
-/*
- * We are called very early to get the low memory for the
- * SMP bootup trampoline page.
- */
-void __init smp_alloc_memory(void)
-{
-	trampoline_base = alloc_bootmem_low_pages(PAGE_SIZE);
-	/*
-	 * Has to be in very low memory so we can execute
-	 * real-mode AP code.
-	 */
-	if (__pa(trampoline_base) >= 0x9F000)
-		BUG();
-}
-
-/*
  * The bootstrap kernel entry code has set these up. Save them for
  * a given CPU
  */
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 2cc1b8b..9f4935e 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -85,20 +85,6 @@ struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
 #define set_idle_for_cpu(x,p)   (idle_thread_array[(x)] = (p))
 #endif
 
-
-/*
- * Currently trivial. Write the real->protected mode
- * bootstrap into the page concerned. The caller
- * has made sure it's suitably aligned.
- */
-
-static unsigned long __cpuinit setup_trampoline(void)
-{
-	void *tramp = __va(SMP_TRAMPOLINE_BASE); 
-	memcpy(tramp, trampoline_data, trampoline_end - trampoline_data);
-	return virt_to_phys(tramp);
-}
-
 /*
  * The bootstrap kernel entry code has set these up. Save them for
  * a given CPU
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index b2a1697..513c857 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -14,6 +14,7 @@ extern unsigned int num_processors;
  */
 extern const unsigned char trampoline_data [];
 extern const unsigned char trampoline_end  [];
+extern unsigned char *trampoline_base;
 
 struct smp_ops {
 	void (*smp_prepare_boot_cpu)(void);
@@ -81,6 +82,9 @@ extern void __cpu_die(unsigned int cpu);
 
 extern unsigned disabled_cpus;
 extern void prefill_possible_map(void);
+
+#define SMP_TRAMPOLINE_BASE 0x6000
+extern unsigned long setup_trampoline(void);
 #endif
 
 #ifdef CONFIG_X86_32
diff --git a/include/asm-x86/smp_64.h b/include/asm-x86/smp_64.h
index d554d7d..394c785 100644
--- a/include/asm-x86/smp_64.h
+++ b/include/asm-x86/smp_64.h
@@ -40,8 +40,6 @@ static inline int cpu_present_to_apicid(int mps_cpu)
 
 #ifdef CONFIG_SMP
 
-#define SMP_TRAMPOLINE_BASE 0x6000
-
 #define raw_smp_processor_id()	read_pda(cpunumber)
 #define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)
 
-- 
1.5.0.6


  reply	other threads:[~2008-03-03 17:27 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-03 17:12 [PATCH 0/52] First attempt at smp integration Glauber Costa
2008-03-03 17:12 ` [PATCH 01/52] commonize smp.h Glauber Costa
2008-03-03 17:12   ` [PATCH 02/52] merge extern function definitions Glauber Costa
2008-03-03 17:12     ` [PATCH 03/52] merge extern variables definitions Glauber Costa
2008-03-03 17:12       ` [PATCH 04/52] define smp_ops in common header Glauber Costa
2008-03-03 17:12         ` [PATCH 05/52] move smp_ops extern declaration to " Glauber Costa
2008-03-03 17:12           ` [PATCH 06/52] merge smp_send_reschedule Glauber Costa
2008-03-03 17:12             ` [PATCH 07/52] unify smp_call_function_mask Glauber Costa
2008-03-03 17:12               ` [PATCH 08/52] unify __cpu_up Glauber Costa
2008-03-03 17:12                 ` [PATCH 09/52] unify prepare_boot_cpu Glauber Costa
2008-03-03 17:12                   ` [PATCH 10/52] unify smp_prepare_cpus Glauber Costa
2008-03-03 17:12                     ` [PATCH 11/52] unify smp_cpus_done Glauber Costa
2008-03-03 17:12                       ` [PATCH 12/52] move disabled_cpus to common header Glauber Costa
2008-03-03 17:12                         ` [PATCH 13/52] use disabled_cpus in i386 Glauber Costa
2008-03-03 17:12                           ` [PATCH 14/52] move prefill_possible_map to common file Glauber Costa
2008-03-03 17:12                             ` [PATCH 15/52] remove export for smp_call_function_mask Glauber Costa
2008-03-03 17:12                               ` [PATCH 16/52] remove irqs disabled warning Glauber Costa
2008-03-03 17:12                                 ` [PATCH 17/52] create smpcommon.c Glauber Costa
2008-03-03 17:12                                   ` [PATCH 18/52] provide __smp_call_function Glauber Costa
2008-03-03 17:12                                     ` [PATCH 19/52] change x86_64 smp_call_function_mask to look alike i386 Glauber Costa
2008-03-03 17:12                                       ` [PATCH 20/52] provide hlt_works function Glauber Costa
2008-03-03 17:12                                         ` [PATCH 21/52] make stop_this_cpu looks exactly equal in both arches Glauber Costa
2008-03-03 17:12                                           ` [PATCH 22/52] add reboot_force test to native_smp_send_stop Glauber Costa
2008-03-03 17:12                                             ` [PATCH 23/52] unify smp_send_stop Glauber Costa
2008-03-03 17:12                                               ` [PATCH 24/52] create smp.c Glauber Costa
2008-03-03 17:12                                                 ` [PATCH 25/52] create ipi.c Glauber Costa
2008-03-03 17:12                                                   ` [PATCH 26/52] create tlb files Glauber Costa
2008-03-03 17:12                                                     ` [PATCH 27/52] get rid of smp_32.c and smp_64.c Glauber Costa
2008-03-03 17:12                                                       ` [PATCH 28/52] remove cpu_llc_id from processor.h Glauber Costa
2008-03-03 17:12                                                         ` [PATCH 29/52] adjust types in smpcommon_32.c Glauber Costa
2008-03-03 17:12                                                           ` [PATCH 30/52] move equal types to common file Glauber Costa
2008-03-03 17:12                                                             ` [PATCH 31/52] make set_cpu_sibling_map nonstatic Glauber Costa
2008-03-03 17:13                                                               ` [PATCH 32/52] make remove_siblinginfo non-static Glauber Costa
2008-03-03 17:13                                                                 ` [PATCH 33/52] move hotplug related extern definitions to smp.h Glauber Costa
2008-03-03 17:13                                                                   ` [PATCH 34/52] move sibling functions to common file Glauber Costa
2008-03-03 17:13                                                                     ` [PATCH 35/52] move cpu_coregroup_map " Glauber Costa
2008-03-03 17:13                                                                       ` [PATCH 36/52] remove vector_lock around cpu_online_map Glauber Costa
2008-03-03 17:13                                                                         ` [PATCH 37/52] use remove_from_maps in cpu_disable Glauber Costa
2008-03-03 17:13                                                                           ` [PATCH 38/52] do not clear cpu_online_map Glauber Costa
2008-03-03 17:13                                                                             ` [PATCH 39/52] merge __cpu_disable and cpu_die Glauber Costa
2008-03-03 17:13                                                                               ` [PATCH 40/52] make x86_64 accept the max_cpus parameter Glauber Costa
2008-03-03 17:13                                                                                 ` [PATCH 41/52] move trampoline arrays extern definition to smp.h Glauber Costa
2008-03-03 17:13                                                                                   ` [PATCH 42/52] adapt voyager's trampoline_base Glauber Costa
2008-03-03 17:13                                                                                     ` [PATCH 43/52] adapt voyager's setup_trampoline Glauber Costa
2008-03-03 17:13                                                                                       ` Glauber Costa [this message]
2008-03-03 17:13                                                                                         ` [PATCH 45/52] use wait_for_init_deassert in x86_64 Glauber Costa
2008-03-03 17:13                                                                                           ` [PATCH 46/52] use cpu_relax instead of rep_nop Glauber Costa
2008-03-03 17:13                                                                                             ` [PATCH 47/52] leave irqs enabled while calibrating delay Glauber Costa
2008-03-03 17:13                                                                                               ` [PATCH 48/52] modify x86_64 smp_callin so it looks like i386 Glauber Costa
2008-03-03 17:13                                                                                                 ` [PATCH 49/52] wrap esr setting up in i386 in lapic_setup_esr Glauber Costa
2008-03-03 17:13                                                                                                   ` [PATCH 50/52] provide an end_local_APIC_setup function Glauber Costa
2008-03-03 17:13                                                                                                     ` [PATCH 51/52] make map_cpu_to_logical_apicid nonstatic Glauber Costa
2008-03-03 17:13                                                                                                       ` [PATCH 52/52] merge smp_callin Glauber Costa
2008-03-03 17:22 ` [PATCH 0/52] First attempt at smp integration Ingo Molnar
2008-03-03 17:35   ` Glauber Costa
2008-03-03 17:23 ` Andi Kleen
2008-03-03 17:38   ` Glauber Costa

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