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x86: unify setup_trampoline

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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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Glauber Costa 2008-03-03 14:13:12 -03:00 committed by Ingo Molnar
parent da522b0729
commit 91718e8d13
5 changed files with 37 additions and 45 deletions
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33
arch/x86/kernel/smpboot.c
View File

@ -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)

29
arch/x86/kernel/smpboot_32.c
View File

@ -73,40 +73,11 @@ 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

14
arch/x86/kernel/smpboot_64.c
View File

@ -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

4
include/asm-x86/smp.h
View File

@ -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

2
include/asm-x86/smp_64.h
View File

@ -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)