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[PATCH] x86: fix broken SMP boot sequence

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Recent GDT changes broke the SMP boot sequence if the booting CPU is
numbered anything other than zero.  There's also a subtle source of error
in that the boot time CPU now uses cpu_gdt_table (which is actually the GDT
for booting CPUs in head.S).  This patch fixes both problems by making GDT
descriptors themselves allocated from a per_cpu area and switching to them
in cpu_init(), which now means that cpu_gdt_table is exclusively used for
booting CPUs again.

Signed-off-by: James Bottomley <[email protected]>
Cc: Zachary Amsden <[email protected]>
Cc: Matt Tolentino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
James Bottomley 2006-02-24 13:04:14 -08:00 • committed by Linus Torvalds
commit 2b932f6cf0
6 changed files with 39 additions and 21 deletions
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6
include/asm-i386/desc.h
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@ -24,11 +24,13 @@ struct Xgt_desc_struct {
unsigned short pad;
} __attribute__ ((packed));
extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS];
extern struct Xgt_desc_struct idt_descr;
DECLARE_PER_CPU(struct Xgt_desc_struct, cpu_gdt_descr);
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
{
return ((struct desc_struct *)cpu_gdt_descr[cpu].address);
return (struct desc_struct *)per_cpu(cpu_gdt_descr, cpu).address;
}
#define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))