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author | Kartik Agaram <vc@akkartik.com> | 2020-01-01 18:22:19 -0800 |
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committer | Kartik Agaram <vc@akkartik.com> | 2020-01-01 18:42:48 -0800 |
commit | 65409d2312e702a48d3cf5b32479d25266bda3c3 (patch) | |
tree | 62a7262fce61f2302109246da4536ce6f8e9ef80 /kernel.soso/spinlock.c | |
parent | a6da50ad30d2e1825575ffef497ab450a8f26e94 (diff) | |
download | mu-65409d2312e702a48d3cf5b32479d25266bda3c3.tar.gz |
5858
Move script to create a Soso boot image into a sub-directory. I'm trying to streamline newcomer attention to just a couple of use cases.
Diffstat (limited to 'kernel.soso/spinlock.c')
-rw-r--r-- | kernel.soso/spinlock.c | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/kernel.soso/spinlock.c b/kernel.soso/spinlock.c deleted file mode 100644 index 8efbdb20..00000000 --- a/kernel.soso/spinlock.c +++ /dev/null @@ -1,25 +0,0 @@ -#include "spinlock.h" - -static inline int32 exchangeAtomic(volatile int32* oldValueAddress, int32 newValue) { - //no need to use lock instruction on xchg - - asm volatile ("xchgl %0, %1" - : "=r"(newValue) - : "m"(*oldValueAddress), "0"(newValue) - : "memory"); - return newValue; -} - -void Spinlock_Init(Spinlock* spinlock) { - *spinlock = 0; -} - -void Spinlock_Lock(Spinlock* spinlock) { - while (exchangeAtomic((int32*)spinlock, 1)) { - halt(); - } -} - -void Spinlock_Unlock(Spinlock* spinlock) { - *spinlock = 0; -} |