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struct ptr_16_64 {
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struct ptr_16_64 {
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    __u16 limit;
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    __u16 limit;
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    __u64 base;
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    __u64 base;
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} __attribute__ ((packed));
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} __attribute__ ((packed));
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struct ptr_16_32 {
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    __u16 limit;
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    __u32 base;
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} __attribute__ ((packed));
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struct tss {
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struct tss {
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    __u32 reserve1;
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    __u32 reserve1;
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    __u64 rsp0;
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    __u64 rsp0;
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    __u64 rsp1;
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    __u64 rsp1;
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    __u64 rsp2;
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    __u64 rsp2;
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extern struct descriptor gdt[];
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extern struct descriptor gdt[];
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extern struct idescriptor idt[];
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extern struct idescriptor idt[];
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extern struct ptr_16_64 gdtr;
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extern struct ptr_16_64 gdtr;
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extern struct ptr_16_32 bsp_bootstrap_gdtr;
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extern struct ptr_16_32 ap_bootstrap_gdtr;
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extern void pm_init(void);
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extern void pm_init(void);
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extern void gdt_tss_setbase(struct descriptor *d, __address base);
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extern void gdt_tss_setbase(struct descriptor *d, __address base);
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extern void gdt_tss_setlimit(struct descriptor *d, __u32 limit);
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extern void gdt_tss_setlimit(struct descriptor *d, __u32 limit);