diff options
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 7bf402be13bb..6f6ca6bd58d6 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1804,6 +1804,22 @@ static inline void gdt_setup_doublefault_tss(int cpu) } #endif /* !CONFIG_X86_64 */ +static inline void tss_setup_io_bitmap(struct tss_struct *tss) +{ + tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_INVALID; + +#ifdef CONFIG_X86_IOPL_IOPERM + tss->io_bitmap.prev_max = 0; + tss->io_bitmap.prev_sequence = 0; + memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap)); + /* + * Invalidate the extra array entry past the end of the all + * permission bitmap as required by the hardware. + */ + tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL; +#endif +} + /* * cpu_init() initializes state that is per-CPU. Some data is already * initialized (naturally) in the bootstrap process, such as the GDT @@ -1860,15 +1876,7 @@ void cpu_init(void) /* Initialize the TSS. */ tss_setup_ist(tss); - tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_INVALID; - tss->io_bitmap.prev_max = 0; - tss->io_bitmap.prev_sequence = 0; - memset(tss->io_bitmap.bitmap, 0xff, sizeof(tss->io_bitmap.bitmap)); - /* - * Invalidate the extra array entry past the end of the all - * permission bitmap as required by the hardware. - */ - tss->io_bitmap.mapall[IO_BITMAP_LONGS] = ~0UL; + tss_setup_io_bitmap(tss); set_tss_desc(cpu, &get_cpu_entry_area(cpu)->tss.x86_tss); load_TR_desc(); |