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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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54cd0eac72
With the types used to access descriptors in x86_64 and i386 now being the same, the code that effectively handles them can now be easily shared. This patch moves the paravirt part of desc_32.h into desc.h, and then, we get paravirt support in x86_64 for free. 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>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* Written 2000 by Andi Kleen */
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#ifndef __ARCH_DESC_H
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#define __ARCH_DESC_H
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#include <linux/threads.h>
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#include <asm/ldt.h>
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#ifndef __ASSEMBLY__
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#include <linux/string.h>
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#include <asm/segment.h>
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static inline void _set_gate(int gate, unsigned type, unsigned long func,
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unsigned dpl, unsigned ist)
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{
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gate_desc s;
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s.offset_low = PTR_LOW(func);
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s.segment = __KERNEL_CS;
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s.ist = ist;
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s.p = 1;
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s.dpl = dpl;
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s.zero0 = 0;
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s.zero1 = 0;
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s.type = type;
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s.offset_middle = PTR_MIDDLE(func);
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s.offset_high = PTR_HIGH(func);
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/*
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* does not need to be atomic because it is only done once at
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* setup time
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*/
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write_idt_entry(idt_table, gate, &s);
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}
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static inline void set_intr_gate(int nr, void *func)
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{
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BUG_ON((unsigned)nr > 0xFF);
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_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 0, 0);
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}
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static inline void set_intr_gate_ist(int nr, void *func, unsigned ist)
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{
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BUG_ON((unsigned)nr > 0xFF);
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_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 0, ist);
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}
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static inline void set_system_gate(int nr, void *func)
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{
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BUG_ON((unsigned)nr > 0xFF);
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_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 3, 0);
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}
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static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
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{
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_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 3, ist);
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}
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static inline void set_tss_desc(unsigned cpu, void *addr)
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{
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struct desc_struct *d = get_cpu_gdt_table(cpu);
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tss_desc tss;
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/*
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* sizeof(unsigned long) coming from an extra "long" at the end
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* of the iobitmap. See tss_struct definition in processor.h
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*
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* -1? seg base+limit should be pointing to the address of the
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* last valid byte
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*/
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set_tssldt_descriptor(&tss,
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(unsigned long)addr, DESC_TSS,
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IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
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write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
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}
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#endif /* !__ASSEMBLY__ */
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#endif
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