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x86: unify tss_struct

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Although slighly different, the tss_struct is very similar in x86_64 and
i386. The really different part, which matchs the hardware vision of it, is
now called x86_hw_tss, and each of the architectures provides yours.
It's then used as a field in the outter tss_struct.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:31:31 +01:00 • committed by Ingo Molnar
commit ca241c7503
9 changed files with 85 additions and 103 deletions
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77
include/asm-x86/processor.h
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@ -8,6 +8,7 @@ struct task_struct;
struct mm_struct;
#include <asm/page.h>
#include <asm/percpu.h>
#include <asm/system.h>
/*
@ -38,6 +39,82 @@ static inline void load_cr3(pgd_t *pgdir)
write_cr3(__pa(pgdir));
}
#ifdef CONFIG_X86_32
/* This is the TSS defined by the hardware. */
struct x86_hw_tss {
unsigned short back_link, __blh;
unsigned long sp0;
unsigned short ss0, __ss0h;
unsigned long sp1;
unsigned short ss1, __ss1h; /* ss1 caches MSR_IA32_SYSENTER_CS */
unsigned long sp2;
unsigned short ss2, __ss2h;
unsigned long __cr3;
unsigned long ip;
unsigned long flags;
unsigned long ax, cx, dx, bx;
unsigned long sp, bp, si, di;
unsigned short es, __esh;
unsigned short cs, __csh;
unsigned short ss, __ssh;
unsigned short ds, __dsh;
unsigned short fs, __fsh;
unsigned short gs, __gsh;
unsigned short ldt, __ldth;
unsigned short trace, io_bitmap_base;
} __attribute__((packed));
#else
struct x86_hw_tss {
u32 reserved1;
u64 sp0;
u64 sp1;
u64 sp2;
u64 reserved2;
u64 ist[7];
u32 reserved3;
u32 reserved4;
u16 reserved5;
u16 io_bitmap_base;
} __attribute__((packed)) ____cacheline_aligned;
#endif
/*
* Size of io_bitmap.
*/
#define IO_BITMAP_BITS 65536
#define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
#define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
#define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
#define INVALID_IO_BITMAP_OFFSET 0x8000
#define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000
struct tss_struct {
struct x86_hw_tss x86_tss;
/*
* The extra 1 is there because the CPU will access an
* additional byte beyond the end of the IO permission
* bitmap. The extra byte must be all 1 bits, and must
* be within the limit.
*/
unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
/*
* Cache the current maximum and the last task that used the bitmap:
*/
unsigned long io_bitmap_max;
struct thread_struct *io_bitmap_owner;
/*
* pads the TSS to be cacheline-aligned (size is 0x100)
*/
unsigned long __cacheline_filler[35];
/*
* .. and then another 0x100 bytes for emergency kernel stack
*/
unsigned long stack[64];
} __attribute__((packed));
DECLARE_PER_CPU(struct tss_struct, init_tss);
#ifdef CONFIG_X86_32
# include "processor_32.h"
#else