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Rev 1702 Rev 1780
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    /* This is _mess_ - the 64-bit CS is argument+16,
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    /* This is _mess_ - the 64-bit CS is argument+16,
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     * the SS is argument+8. The order is:
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     * the SS is argument+8. The order is:
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     * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES)
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     * +0(KDATA_DES), +8(UDATA_DES), +16(UTEXT_DES)
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     */
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     */
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    write_msr(AMD_MSR_STAR,
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    write_msr(AMD_MSR_STAR,
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          ((__u64)(gdtselector(KDATA_DES) | PL_USER)<<48) \
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          ((uint64_t)(gdtselector(KDATA_DES) | PL_USER)<<48) \
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          | ((__u64)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32));
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          | ((uint64_t)(gdtselector(KTEXT_DES) | PL_KERNEL)<<32));
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    write_msr(AMD_MSR_LSTAR, (__u64)syscall_entry);
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    write_msr(AMD_MSR_LSTAR, (uint64_t)syscall_entry);
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    /* Mask RFLAGS on syscall
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    /* Mask RFLAGS on syscall
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     * - disable interrupts, until we exchange the stack register
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     * - disable interrupts, until we exchange the stack register
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     *   (mask the IE bit)
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     *   (mask the IE bit)
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     */
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     */
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    write_msr(AMD_MSR_SFMASK, 0x200);
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    write_msr(AMD_MSR_SFMASK, 0x200);