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/* Written 2000 by Andi Kleen */
#ifndef __ARCH_DESC_H
#define __ARCH_DESC_H
#include <linux/threads.h>
#include <asm/ldt.h>
#ifndef __ASSEMBLY__
#include <linux/string.h>
#include <asm/segment.h>
static inline void _set_gate(int gate, unsigned type, unsigned long func,
unsigned dpl, unsigned ist)
{
gate_desc s;
s.offset_low = PTR_LOW(func);
s.segment = __KERNEL_CS;
s.ist = ist;
s.p = 1;
s.dpl = dpl;
s.zero0 = 0;
s.zero1 = 0;
s.type = type;
s.offset_middle = PTR_MIDDLE(func);
s.offset_high = PTR_HIGH(func);
/*
* does not need to be atomic because it is only done once at
* setup time
*/
write_idt_entry(idt_table, gate, &s);
}
static inline void set_intr_gate(int nr, void *func)
{
BUG_ON((unsigned)nr > 0xFF);
_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 0, 0);
}
static inline void set_intr_gate_ist(int nr, void *func, unsigned ist)
{
BUG_ON((unsigned)nr > 0xFF);
_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 0, ist);
}
static inline void set_system_gate(int nr, void *func)
{
BUG_ON((unsigned)nr > 0xFF);
_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 3, 0);
}
static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
{
_set_gate(nr, GATE_INTERRUPT, (unsigned long) func, 3, ist);
}
static inline void set_tss_desc(unsigned cpu, void *addr)
{
struct desc_struct *d = get_cpu_gdt_table(cpu);
tss_desc tss;
/*
* sizeof(unsigned long) coming from an extra "long" at the end
* of the iobitmap. See tss_struct definition in processor.h
*
* -1? seg base+limit should be pointing to the address of the
* last valid byte
*/
set_tssldt_descriptor(&tss,
(unsigned long)addr, DESC_TSS,
IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
}
#endif /* !__ASSEMBLY__ */
#endif
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