x86: unify paravirt pieces of descriptor handling

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>

1 files changed, 11 insertions, 93 deletions

diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h
index a7a6c301c6b..b0290c45319 100644
--- a/include/asm-x86/desc_64.h
+++ b/include/asm-x86/desc_64.h
@@ -8,47 +8,10 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/string.h>
-#include <linux/smp.h>
 
 #include <asm/segment.h>
 
-extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
-
-#define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))
-#define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
-
-static inline unsigned long __store_tr(void)
-{
-       unsigned long tr;
-
-       asm volatile ("str %w0":"=r" (tr));
-       return tr;
-}
-
-#define store_tr(tr) (tr) = __store_tr()
-
-extern struct desc_ptr cpu_gdt_descr[];
-
-static inline void write_ldt_entry(struct desc_struct *ldt,
-				   int entry, void *ptr)
-{
-	memcpy(&ldt[entry], ptr, 8);
-}
-
-/* the cpu gdt accessor */
-#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address)
-
-static inline void load_gdt(const struct desc_ptr *ptr)
-{
-	asm volatile("lgdt %w0"::"m" (*ptr));
-}
-
-static inline void store_gdt(struct desc_ptr *ptr)
-{
-       asm("sgdt %w0":"=m" (*ptr));
-}
-
-static inline void _set_gate(void *adr, unsigned type, unsigned long func,
+static inline void _set_gate(int gate, unsigned type, unsigned long func,
 			     unsigned dpl, unsigned ist)
 {
 	gate_desc s;
@@ -67,61 +30,37 @@ static inline void _set_gate(void *adr, unsigned type, unsigned long func,
 	 * does not need to be atomic because it is only done once at
 	 * setup time
 	 */
-	memcpy(adr, &s, 16);
+	write_idt_entry(idt_table, gate, &s);
 }
 
 static inline void set_intr_gate(int nr, void *func)
 {
 	BUG_ON((unsigned)nr > 0xFF);
-	_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0);
+	_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(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist);
+	_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(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
+	_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(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
-}
-
-static inline void load_idt(const struct desc_ptr *ptr)
-{
-	asm volatile("lidt %w0"::"m" (*ptr));
-}
-
-static inline void store_idt(struct desc_ptr *dtr)
-{
-       asm("sidt %w0":"=m" (*dtr));
-}
-
-static inline void set_tssldt_descriptor(void *ptr, unsigned long tss,
-					 unsigned type, unsigned size)
-{
-	struct ldttss_desc64 d;
-
-	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);
-	memcpy(ptr, &d, 16);
+	_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
@@ -129,31 +68,10 @@ static inline void set_tss_desc(unsigned cpu, void *addr)
 	 * -1? seg base+limit should be pointing to the address of the
 	 * last valid byte
 	 */
-	set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS],
+	set_tssldt_descriptor(&tss,
 		(unsigned long)addr, DESC_TSS,
 		IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1);
-}
-
-static inline void set_ldt(void *addr, int entries)
-{
-	if (likely(entries == 0))
-		__asm__ __volatile__("lldt %w0"::"q" (0));
-	else {
-		unsigned cpu = smp_processor_id();
-
-		set_tssldt_descriptor(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT],
-			     (unsigned long)addr, DESC_LDT, entries * 8 - 1);
-		__asm__ __volatile__("lldt %w0"::"q" (GDT_ENTRY_LDT*8));
-	}
-}
-
-static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
-{
-	unsigned int i;
-	struct desc_struct *gdt = (get_cpu_gdt_table(cpu) + GDT_ENTRY_TLS_MIN);
-
-	for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
-		gdt[i] = t->tls_array[i];
+	write_gdt_entry(d, GDT_ENTRY_TSS, &tss, DESC_TSS);
 }
 
 #endif /* !__ASSEMBLY__ */