#include <asm/mmu.h>
#include <linux/smp.h>
-static inline void fill_ldt(struct desc_struct *desc, struct user_desc *info)
+static inline void fill_ldt(struct desc_struct *desc,
+ const struct user_desc *info)
{
desc->limit0 = info->limit & 0x0ffff;
desc->base0 = info->base_addr & 0x0000ffff;
extern struct desc_ptr cpu_gdt_descr[];
/* the cpu gdt accessor */
#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address)
+
+static inline void pack_gate(gate_desc *gate, unsigned type, unsigned long func,
+ unsigned dpl, unsigned ist, unsigned seg)
+{
+ gate->offset_low = PTR_LOW(func);
+ gate->segment = __KERNEL_CS;
+ gate->ist = ist;
+ gate->p = 1;
+ gate->dpl = dpl;
+ gate->zero0 = 0;
+ gate->zero1 = 0;
+ gate->type = type;
+ gate->offset_middle = PTR_MIDDLE(func);
+ gate->offset_high = PTR_HIGH(func);
+}
+
#else
struct gdt_page {
struct desc_struct gdt[GDT_ENTRIES];
{
return per_cpu(gdt_page, cpu).gdt;
}
+
+static inline void pack_gate(gate_desc *gate, unsigned char type,
+ unsigned long base, unsigned dpl, unsigned flags, unsigned short seg)
+
+{
+ gate->a = (seg << 16) | (base & 0xffff);
+ gate->b = (base & 0xffff0000) |
+ (((0x80 | type | (dpl << 5)) & 0xff) << 8);
+}
+
#endif
+static inline int desc_empty(const void *ptr)
+{
+ const u32 *desc = ptr;
+ return !(desc[0] | desc[1]);
+}
+
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
memcpy(&gdt[entry], desc, size);
}
-static inline void set_tssldt_descriptor(struct ldttss_desc64 *d,
- unsigned long tss, unsigned type,
- unsigned size)
-{
- memset(d, 0, sizeof(*d));
- d->limit0 = size & 0xFFFF;
- d->base0 = PTR_LOW(tss);
- d->base1 = PTR_MIDDLE(tss) & 0xFF;
- d->type = type;
- d->p = 1;
- d->limit1 = (size >> 16) & 0xF;
- d->base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF;
- d->base3 = PTR_HIGH(tss);
-}
-
static inline void pack_descriptor(struct desc_struct *desc, unsigned long base,
unsigned long limit, unsigned char type,
unsigned char flags)
desc->p = 1;
}
-static inline void pack_ldt(ldt_desc *ldt, unsigned long addr,
- unsigned size)
-{
+static inline void set_tssldt_descriptor(void *d, unsigned long addr,
+ unsigned type, unsigned size)
+{
#ifdef CONFIG_X86_64
- set_tssldt_descriptor(ldt,
- addr, DESC_LDT, size);
+ struct ldttss_desc64 *desc = d;
+ memset(desc, 0, sizeof(*desc));
+ desc->limit0 = size & 0xFFFF;
+ desc->base0 = PTR_LOW(addr);
+ desc->base1 = PTR_MIDDLE(addr) & 0xFF;
+ desc->type = type;
+ desc->p = 1;
+ desc->limit1 = (size >> 16) & 0xF;
+ desc->base2 = (PTR_MIDDLE(addr) >> 8) & 0xFF;
+ desc->base3 = PTR_HIGH(addr);
#else
- pack_descriptor(ldt, (unsigned long)addr,
- size,
- 0x80 | DESC_LDT, 0);
+
+ pack_descriptor((struct desc_struct *)d, addr, size, 0x80 | type, 0);
#endif
}
+static inline void __set_tss_desc(unsigned cpu, unsigned int entry, 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, entry, &tss, DESC_TSS);
+}
+
+#define set_tss_desc(cpu, addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr)
+
static inline void native_set_ldt(const void *addr, unsigned int entries)
{
if (likely(entries == 0))
unsigned cpu = smp_processor_id();
ldt_desc ldt;
- pack_ldt(&ldt, (unsigned long)addr,
- entries * sizeof(ldt) - 1);
+ set_tssldt_descriptor(&ldt, (unsigned long)addr,
+ DESC_LDT, entries * sizeof(ldt) - 1);
write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT,
&ldt, DESC_LDT);
__asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
gdt[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i];
}
-#ifdef CONFIG_X86_32
-# include "desc_32.h"
-#else
-# include "desc_64.h"
-#endif
-
#define _LDT_empty(info) (\
(info)->base_addr == 0 && \
(info)->limit == 0 && \
preempt_enable();
}
-static inline unsigned long get_desc_base(struct desc_struct *desc)
+static inline unsigned long get_desc_base(const struct desc_struct *desc)
{
return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
}
+static inline unsigned long get_desc_limit(const struct desc_struct *desc)
+{
+ return desc->limit0 | (desc->limit << 16);
+}
+
+static inline void _set_gate(int gate, unsigned type, void *addr,
+ unsigned dpl, unsigned ist, unsigned seg)
+{
+ gate_desc s;
+ pack_gate(&s, type, (unsigned long)addr, dpl, ist, seg);
+ /*
+ * does not need to be atomic because it is only done once at
+ * setup time
+ */
+ write_idt_entry(idt_table, gate, &s);
+}
+
+/*
+ * This needs to use 'idt_table' rather than 'idt', and
+ * thus use the _nonmapped_ version of the IDT, as the
+ * Pentium F0 0F bugfix can have resulted in the mapped
+ * IDT being write-protected.
+ */
+static inline void set_intr_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0, 0, __KERNEL_CS);
+}
+
+/*
+ * This routine sets up an interrupt gate at directory privilege level 3.
+ */
+static inline void set_system_intr_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
+}
+
+static inline void set_trap_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_TRAP, addr, 0, 0, __KERNEL_CS);
+}
+
+static inline void set_system_gate(unsigned int n, void *addr)
+{
+ BUG_ON((unsigned)n > 0xFF);
+#ifdef CONFIG_X86_32
+ _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS);
+#else
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS);
+#endif
+}
+
+static inline void set_task_gate(unsigned int n, unsigned int gdt_entry)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_TASK, (void *)0, 0, 0, (gdt_entry<<3));
+}
+
+static inline void set_intr_gate_ist(int n, void *addr, unsigned ist)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0, ist, __KERNEL_CS);
+}
+
+static inline void set_system_gate_ist(int n, void *addr, unsigned ist)
+{
+ BUG_ON((unsigned)n > 0xFF);
+ _set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
+}
+
#else
/*
* GET_DESC_BASE reads the descriptor base of the specified segment.
projects / linux-2.6 / blobdiff