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authorStuart Menefy <stuart.menefy@st.com>2007-11-30 16:12:36 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:58 +0900
commit1efe4ce3ca126da77e450d5a83f7201949d76f62 (patch)
treefbae9902aa4103a9e86d06f841d580f24682e7b3 /include/asm-sh/bitops-irq.h
parent53ff09422e5e7a6d6198b767c8f494e43ec8e3ae (diff)
sh: GUSA atomic rollback support.
This implements kernel-level atomic rollback built on top of gUSA, as an alternative non-IRQ based atomicity method. This is generally a faster method for platforms that are lacking the LL/SC pairs that SH-4A and later use, and is only supportable on legacy cores. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/bitops-irq.h')
-rw-r--r--include/asm-sh/bitops-irq.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/include/asm-sh/bitops-irq.h b/include/asm-sh/bitops-irq.h
new file mode 100644
index 000000000000..653a12750584
--- /dev/null
+++ b/include/asm-sh/bitops-irq.h
@@ -0,0 +1,91 @@
+#ifndef __ASM_SH_BITOPS_IRQ_H
+#define __ASM_SH_BITOPS_IRQ_H
+
+static inline void set_bit(int nr, volatile void *addr)
+{
+ int mask;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ *a |= mask;
+ local_irq_restore(flags);
+}
+
+static inline void clear_bit(int nr, volatile void *addr)
+{
+ int mask;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ *a &= ~mask;
+ local_irq_restore(flags);
+}
+
+static inline void change_bit(int nr, volatile void *addr)
+{
+ int mask;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ *a ^= mask;
+ local_irq_restore(flags);
+}
+
+static inline int test_and_set_bit(int nr, volatile void *addr)
+{
+ int mask, retval;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ retval = (mask & *a) != 0;
+ *a |= mask;
+ local_irq_restore(flags);
+
+ return retval;
+}
+
+static inline int test_and_clear_bit(int nr, volatile void *addr)
+{
+ int mask, retval;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ retval = (mask & *a) != 0;
+ *a &= ~mask;
+ local_irq_restore(flags);
+
+ return retval;
+}
+
+static inline int test_and_change_bit(int nr, volatile void *addr)
+{
+ int mask, retval;
+ volatile unsigned int *a = addr;
+ unsigned long flags;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ local_irq_save(flags);
+ retval = (mask & *a) != 0;
+ *a ^= mask;
+ local_irq_restore(flags);
+
+ return retval;
+}
+
+#endif /* __ASM_SH_BITOPS_IRQ_H */