X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Finclude%2Farch.h;h=f9813ed5aceaa348ce177bfca683d5acdd7c19ea;hb=9d85201216cb35e1b1e051b1d7cdc38eaa5befa4;hp=ede3bf059ce5b2904572a2bf0e2d08a5bc56cdfd;hpb=2ae2035466cfa7816079a067ccee25e2b8bac6bc;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/include/arch.h b/Kernel/arch/x86/include/arch.h
index ede3bf05..f9813ed5 100644
--- a/Kernel/arch/x86/include/arch.h
+++ b/Kernel/arch/x86/include/arch.h
@@ -10,6 +10,12 @@
 #define	KERNEL_BASE	0xC0000000
 #define BITS	32
 
+#define INVLPTR	((void*)-1)
+
+// Allow nested spinlocks?
+#define STACKED_LOCKS	2	// 0: No, 1: Per-CPU, 2: Per-Thread
+#define LOCK_DISABLE_INTS	1
+
 // - Processor/Machine Specific Features
 #if ARCH != i386 && ARCH != i486 && ARCH != i586
 # error "Unknown architecture '" #ARCH "'"
@@ -34,57 +40,23 @@
  * \brief Short Spinlock structure
  */
 struct sShortSpinlock {
+	#if STACKED_LOCKS == 2
+	volatile void	*Lock;	//!< Lock value
+	#else
 	volatile int	Lock;	//!< Lock value
-	 int	IF;	//!< Interrupt state on call to SHORTLOCK
-};
-/**
- * \brief Determine if a short spinlock is locked
- * \param Lock	Lock pointer
- */
-static inline int IS_LOCKED(struct sShortSpinlock *Lock) {
-	return !!Lock->Lock;
-}
-/**
- * \brief Acquire a Short Spinlock
- * \param Lock	Lock pointer
- * 
- * This type of mutex should only be used for very short sections of code,
- * or in places where a Mutex_* would be overkill, such as appending
- * an element to linked list (usually two assignement lines in C)
- * 
- * \note This type of lock halts interrupts, so ensure that no timing
- * functions are called while it is held.
- */
-static inline void SHORTLOCK(struct sShortSpinlock *Lock) {
-	 int	v = 1;
-	
-	// Save interrupt state
-	__ASM__ ("pushf;\n\tpop %%eax" : "=a"(Lock->IF));
-	Lock->IF &= 0x200;
-	
-	// Stop interrupts
-	__ASM__ ("cli");
+	#endif
 	
-	// Wait for another CPU to release
-	while(v)
-		__ASM__("xchgl %%eax, (%%edi)":"=a"(v):"a"(1),"D"(&Lock->Lock));
-}
-/**
- * \brief Release a short lock
- * \param Lock	Lock pointer
- */
-static inline void SHORTREL(struct sShortSpinlock *Lock) {
-	Lock->Lock = 0;
-	#if 0	// Which is faster?, meh the test is simpler
-	__ASM__ ("pushf;\n\tor %0, (%%esp);\n\tpopf" : : "a"(Lock->IF));
-	#else
-	if(Lock->IF)	__ASM__ ("sti");
+	#if LOCK_DISABLE_INTS
+	 int	IF;	//!< Interrupt state on call to SHORTLOCK
+	#endif
+	#if STACKED_LOCKS
+	 int	Depth;
 	#endif
-}
+};
 
 // === MACROS ===
 /**
- * \brief Halt the CPU
+ * \brief Halt the CPU (shorter version of yield)
  */
 #define	HALT()	__asm__ __volatile__ ("hlt")
 /**
@@ -104,16 +76,17 @@ typedef signed short	Sint16;
 typedef signed long		Sint32;
 typedef signed long long	Sint64;
 typedef Uint	size_t;
+typedef char	BOOL;
 
 typedef Uint64	tPAddr;
 typedef Uint32	tVAddr;
 
 typedef struct {
-    Uint	gs, fs, es, ds;
-    Uint	edi, esi, ebp, kesp;
+	Uint	gs, fs, es, ds;
+	Uint	edi, esi, ebp, kesp;
 	Uint	ebx, edx, ecx, eax;
-    Uint	int_num, err_code;
-    Uint	eip, cs;
+	Uint	int_num, err_code;
+	Uint	eip, cs;
 	Uint	eflags, esp, ss;
 } tRegs;
 
@@ -152,4 +125,10 @@ typedef struct {
 	Uint	EIP, ESP, EBP;
 } tTaskState;
 
+// === FUNCTIONS ===
+extern int	IS_LOCKED(struct sShortSpinlock *Lock);
+extern int	CPU_HAS_LOCK(struct sShortSpinlock *Lock);
+extern void	SHORTLOCK(struct sShortSpinlock *Lock);
+extern void	SHORTREL(struct sShortSpinlock *Lock);
+
 #endif	// !defined(_ARCH_H_)