[PATCH] i386: rationalize paravirt wrappers

paravirt.c used to implement native versions of all low-level
functions.  Far cleaner is to have the native versions exposed in the
headers and as inline native_XXX, and if !CONFIG_PARAVIRT, then simply
#define XXX native_XXX.

There are several nice side effects:

1) write_dt_entry() now takes the correct "struct Xgt_desc_struct *"
   not "void *".

2) load_TLS is reintroduced to the for loop, not manually unrolled
   with a #error in case the bounds ever change.

3) Macros become inlines, with type checking.

4) Access to the native versions is trivial for KVM, lguest, Xen and
   others who might want it.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@muc.de>
Cc: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 73 insertions, 21 deletions

diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 80f7e8a1e87..96edfdfe32d 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -147,7 +147,7 @@ static inline void detect_ht(struct cpuinfo_x86 *c) {}
 #define X86_EFLAGS_VIP	0x00100000 /* Virtual Interrupt Pending */
 #define X86_EFLAGS_ID	0x00200000 /* CPUID detection flag */
 
-static inline fastcall void native_cpuid(unsigned int *eax, unsigned int *ebx,
+static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
 					 unsigned int *ecx, unsigned int *edx)
 {
 	/* ecx is often an input as well as an output. */
@@ -545,13 +545,7 @@ static inline void rep_nop(void)
 
 #define cpu_relax()	rep_nop()
 
-#ifdef CONFIG_PARAVIRT
-#include <asm/paravirt.h>
-#else
-#define paravirt_enabled() 0
-#define __cpuid native_cpuid
-
-static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread)
+static inline void native_load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 {
 	tss->esp0 = thread->esp0;
 	/* This can only happen when SEP is enabled, no need to test "SEP"arately */
@@ -561,24 +555,60 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa
 	}
 }
 
-/*
- * These special macros can be used to get or set a debugging register
- */
-#define get_debugreg(var, register)				\
-		__asm__("movl %%db" #register ", %0"		\
-			:"=r" (var))
-#define set_debugreg(value, register)			\
-		__asm__("movl %0,%%db" #register		\
-			: /* no output */			\
-			:"r" (value))
 
-#define set_iopl_mask native_set_iopl_mask
-#endif /* CONFIG_PARAVIRT */
+static inline unsigned long native_get_debugreg(int regno)
+{
+	unsigned long val = 0; 	/* Damn you, gcc! */
+
+	switch (regno) {
+	case 0:
+		asm("movl %%db0, %0" :"=r" (val)); break;
+	case 1:
+		asm("movl %%db1, %0" :"=r" (val)); break;
+	case 2:
+		asm("movl %%db2, %0" :"=r" (val)); break;
+	case 3:
+		asm("movl %%db3, %0" :"=r" (val)); break;
+	case 6:
+		asm("movl %%db6, %0" :"=r" (val)); break;
+	case 7:
+		asm("movl %%db7, %0" :"=r" (val)); break;
+	default:
+		BUG();
+	}
+	return val;
+}
+
+static inline void native_set_debugreg(int regno, unsigned long value)
+{
+	switch (regno) {
+	case 0:
+		asm("movl %0,%%db0"	: /* no output */ :"r" (value));
+		break;
+	case 1:
+		asm("movl %0,%%db1"	: /* no output */ :"r" (value));
+		break;
+	case 2:
+		asm("movl %0,%%db2"	: /* no output */ :"r" (value));
+		break;
+	case 3:
+		asm("movl %0,%%db3"	: /* no output */ :"r" (value));
+		break;
+	case 6:
+		asm("movl %0,%%db6"	: /* no output */ :"r" (value));
+		break;
+	case 7:
+		asm("movl %0,%%db7"	: /* no output */ :"r" (value));
+		break;
+	default:
+		BUG();
+	}
+}
 
 /*
  * Set IOPL bits in EFLAGS from given mask
  */
-static fastcall inline void native_set_iopl_mask(unsigned mask)
+static inline void native_set_iopl_mask(unsigned mask)
 {
 	unsigned int reg;
 	__asm__ __volatile__ ("pushfl;"
@@ -591,6 +621,28 @@ static fastcall inline void native_set_iopl_mask(unsigned mask)
 				: "i" (~X86_EFLAGS_IOPL), "r" (mask));
 }
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define paravirt_enabled() 0
+#define __cpuid native_cpuid
+
+static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread)
+{
+	native_load_esp0(tss, thread);
+}
+
+/*
+ * These special macros can be used to get or set a debugging register
+ */
+#define get_debugreg(var, register)				\
+	(var) = native_get_debugreg(register)
+#define set_debugreg(value, register)				\
+	native_set_debugreg(register, value)
+
+#define set_iopl_mask native_set_iopl_mask
+#endif /* CONFIG_PARAVIRT */
+
 /*
  * Generic CPUID function
  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx