#include <acess.h>
#include <arch.h>
+// === IMPORTS ===
+extern int GetCPUNum(void);
+
// === CODE ===
+/**
+ * \brief Determine if a short spinlock is locked
+ * \param Lock Lock pointer
+ */
+int IS_LOCKED(struct sShortSpinlock *Lock)
+{
+ return !!Lock->Lock;
+}
+
+/**
+ * \brief Check if the current CPU has the lock
+ * \param Lock Lock pointer
+ */
+int CPU_HAS_LOCK(struct sShortSpinlock *Lock)
+{
+ #if STACKED_LOCKS == 1
+ return Lock->Lock == GetCPUNum() + 1;
+ #elif STACKED_LOCKS == 2
+ return Lock->Lock == Proc_GetCurThread();
+ #else
+ return 0;
+ #endif
+}
+
+/**
+ * \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. As a matter of fact, spend as
+ * little time as possible with this lock held
+ * \note If \a STACKED_LOCKS is set, this type of spinlock can be nested
+ */
+void SHORTLOCK(struct sShortSpinlock *Lock)
+{
+ int v = 1;
+ #if LOCK_DISABLE_INTS
+ int IF;
+ #endif
+ #if STACKED_LOCKS == 1
+ int cpu = GetCPUNum() + 1;
+ #elif STACKED_LOCKS == 2
+ void *thread = Proc_GetCurThread();
+ #endif
+
+ #if LOCK_DISABLE_INTS
+ // Save interrupt state and clear interrupts
+ __ASM__ ("pushf;\n\tpop %%rax\n\tcli" : "=a"(IF));
+ IF &= 0x200; // AND out all but the interrupt flag
+ #endif
+
+ #if STACKED_LOCKS == 1
+ if( Lock->Lock == cpu ) {
+ Lock->Depth ++;
+ return ;
+ }
+ #elif STACKED_LOCKS == 2
+ if( Lock->Lock == thread ) {
+ Lock->Depth ++;
+ return ;
+ }
+ #endif
+
+ // Wait for another CPU to release
+ while(v) {
+ // CMPXCHG:
+ // If r/m32 == EAX, set ZF and set r/m32 = r32
+ // Else, clear ZF and set EAX = r/m32
+ #if STACKED_LOCKS == 1
+ __ASM__("lock cmpxchgl %2, (%3)"
+ : "=a"(v)
+ : "a"(0), "r"(cpu), "r"(&Lock->Lock)
+ );
+ #elif STACKED_LOCKS == 2
+ __ASM__("lock cmpxchgl %2, (%3)"
+ : "=a"(v)
+ : "a"(0), "r"(thread), "r"(&Lock->Lock)
+ );
+ #else
+ __ASM__("xchgl %0, (%2)":"=a"(v):"a"(1),"D"(&Lock->Lock));
+ #endif
+ }
+
+ #if LOCK_DISABLE_INTS
+ Lock->IF = IF;
+ #endif
+}
+/**
+ * \brief Release a short lock
+ * \param Lock Lock pointer
+ */
+void SHORTREL(struct sShortSpinlock *Lock)
+{
+ #if STACKED_LOCKS
+ if( Lock->Depth ) {
+ Lock->Depth --;
+ return ;
+ }
+ #endif
+
+ #if LOCK_DISABLE_INTS
+ // Lock->IF can change anytime once Lock->Lock is zeroed
+ if(Lock->IF) {
+ Lock->Lock = 0;
+ __ASM__ ("sti");
+ }
+ else {
+ Lock->Lock = 0;
+ }
+ #else
+ Lock->Lock = 0;
+ #endif
+}
void outb(Uint16 Port, Uint8 Data)
{
}
// === Memory Manipulation ===
+int memcmp(const void *__dest, const void *__src, size_t __count)
+{
+ if( ((tVAddr)__dest & 7) != ((tVAddr)__src & 7) ) {
+ const Uint8 *src = __src, *dst = __dest;
+ while(__count)
+ {
+ if( *src != *dst )
+ return *dst - *src;
+ src ++; dst ++; __count --;
+ }
+ return 0;
+ }
+ else {
+ const Uint8 *src = __src;
+ const Uint8 *dst = __dest;
+ const Uint64 *src64, *dst64;
+
+ while( (tVAddr)src & 7 && __count ) {
+ if( *src != *dst )
+ return *dst - *src;
+ dst ++; src ++; __count --;
+ }
+
+ src64 = (void*)src;
+ dst64 = (void*)dst;
+
+ while( __count >= 8 )
+ {
+ if( *src64 != *dst64 )
+ {
+ src = (void*)src64;
+ dst = (void*)dst64;
+ if(src[0] != dst[0]) return dst[0]-src[0];
+ if(src[1] != dst[1]) return dst[1]-src[1];
+ if(src[2] != dst[2]) return dst[2]-src[2];
+ if(src[3] != dst[3]) return dst[3]-src[3];
+ if(src[4] != dst[4]) return dst[4]-src[4];
+ if(src[5] != dst[5]) return dst[5]-src[5];
+ if(src[6] != dst[6]) return dst[6]-src[6];
+ if(src[7] != dst[7]) return dst[7]-src[7];
+ return -1; // This should never happen
+ }
+ __count -= 8;
+ src64 ++;
+ dst64 ++;
+ }
+
+ src = (void*)src64;
+ dst = (void*)dst64;
+ while( __count-- )
+ {
+ if(*dst != *src) return *dst - *src;
+ dst ++;
+ src ++;
+ }
+ }
+ return 0;
+}
+
void *memcpy(void *__dest, const void *__src, size_t __count)
{
if( ((tVAddr)__dest & 7) != ((tVAddr)__src & 7) )
void *memset(void *__dest, int __val, size_t __count)
{
if( __val != 0 || ((tVAddr)__dest & 7) != 0 )
- __asm__ __volatile__ ("rep stosb" : : "D"(__dest),"a"(__val),"c"(__count));
+ __asm__ __volatile__ ("rep stosb" : : "D"(__dest),"a"(__val),"c"(__count));
else {
- Uint8 *dst = __dest;
+ Uint8 *dst = __dest;
- __asm__ __volatile__ ("rep stosq" : : "D"(dst),"a"(0),"c"(__count/8));
- dst += __count & ~7;
- __count = __count & 7;
- while( __count-- )
- *dst++ = 0;
+ __asm__ __volatile__ ("rep stosq" : : "D"(dst),"a"(0),"c"(__count/8));
+ dst += __count & ~7;
+ __count = __count & 7;
+ while( __count-- )
+ *dst++ = 0;
}
return __dest;
}
+void *memsetd(void *__dest, Uint32 __val, size_t __count)
+{
+ __asm__ __volatile__ ("rep stosl" : : "D"(__dest),"a"(__val),"c"(__count));
+ return __dest;
+}
+
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