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x86: load pointer to pda into %gs while brining up a CPU 

[ Based on original patch from Christoph Lameter and Mike Travis. ]

CPU startup code in head_64.S loaded address of a zero page into %gs
for temporary use till pda is loaded but address to the actual pda is
available at the point.  Load the real address directly instead.

This will help unifying percpu and pda handling later on.

This patch is mostly taken from Mike Travis' "x86_64: Fold pda into
per cpu area" patch.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2009-01-13 20:41:35 +09:00 committed by Ingo Molnar
parent 3e5d8f9784
commit f32ff5388d
5 changed files with 15 additions and 7 deletions
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1
arch/x86/include/asm/trampoline.h
View File

@ -13,6 +13,7 @@ extern unsigned char *trampoline_base;
extern unsigned long init_rsp;
extern unsigned long initial_code;
extern unsigned long initial_gs;
#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
#define TRAMPOLINE_BASE 0x6000

1
arch/x86/kernel/acpi/sleep.c
View File

@ -101,6 +101,7 @@ int acpi_save_state_mem(void)
stack_start.sp = temp_stack + sizeof(temp_stack);
early_gdt_descr.address =
(unsigned long)get_cpu_gdt_table(smp_processor_id());
initial_gs = (unsigned long)cpu_pda(smp_processor_id());
#endif
initial_code = (unsigned long)wakeup_long64;
saved_magic = 0x123456789abcdef0;

4
arch/x86/kernel/head64.c
View File

@ -26,8 +26,8 @@
#include <asm/bios_ebda.h>
#include <asm/trampoline.h>
/* boot cpu pda */
static struct x8664_pda _boot_cpu_pda;
/* boot cpu pda, referenced by head_64.S to initialize %gs for boot CPU */
struct x8664_pda _boot_cpu_pda;
#ifdef CONFIG_SMP
/*

13
arch/x86/kernel/head_64.S
View File

@ -243,12 +243,15 @@ ENTRY(secondary_startup_64)
movl %eax,%fs
movl %eax,%gs
/*
* Setup up a dummy PDA. this is just for some early bootup code
* that does in_interrupt()
/* Set up %gs.
*
* %gs should point to the pda. For initial boot, make %gs point
* to the _boot_cpu_pda in data section. For a secondary CPU,
* initial_gs should be set to its pda address before the CPU runs
* this code.
*/
movl $MSR_GS_BASE,%ecx
movq $empty_zero_page,%rax
movq initial_gs(%rip),%rax
movq %rax,%rdx
shrq $32,%rdx
wrmsr
@ -274,6 +277,8 @@ ENTRY(secondary_startup_64)
.align 8
ENTRY(initial_code)
.quad x86_64_start_kernel
ENTRY(initial_gs)
.quad _boot_cpu_pda
__FINITDATA
ENTRY(stack_start)

1
arch/x86/kernel/smpboot.c
View File

@ -854,6 +854,7 @@ do_rest:
#else
cpu_pda(cpu)->pcurrent = c_idle.idle;
clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
initial_gs = (unsigned long)cpu_pda(cpu);
#endif
early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
initial_code = (unsigned long)start_secondary;