Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/asm-arm26/locks.h b/include/asm-arm26/locks.h
new file mode 100644
index 0000000..81b3bda
--- /dev/null
+++ b/include/asm-arm26/locks.h
@@ -0,0 +1,161 @@
+/*
+ * linux/include/asm-arm/proc-armo/locks.h
+ *
+ * Copyright (C) 2000 Russell King
+ * Fixes for 26 bit machines, (C) 2000 Dave Gilbert
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Interrupt safe locking assembler.
+ */
+#ifndef __ASM_PROC_LOCKS_H
+#define __ASM_PROC_LOCKS_H
+
+/* Decrements by 1, fails if value < 0 */
+#define __down_op(ptr,fail) \
+ ({ \
+ __asm__ __volatile__ ( \
+ "@ atomic down operation\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+" ldr lr, [%0]\n" \
+" and ip, ip, #0x0c000003\n" \
+" subs lr, lr, #1\n" \
+" str lr, [%0]\n" \
+" orrmi ip, ip, #0x80000000 @ set N\n" \
+" teqp ip, #0\n" \
+" movmi ip, %0\n" \
+" blmi " #fail \
+ : \
+ : "r" (ptr) \
+ : "ip", "lr", "cc"); \
+ })
+
+#define __down_op_ret(ptr,fail) \
+ ({ \
+ unsigned int result; \
+ __asm__ __volatile__ ( \
+" @ down_op_ret\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+" ldr lr, [%1]\n" \
+" and ip, ip, #0x0c000003\n" \
+" subs lr, lr, #1\n" \
+" str lr, [%1]\n" \
+" orrmi ip, ip, #0x80000000 @ set N\n" \
+" teqp ip, #0\n" \
+" movmi ip, %1\n" \
+" movpl ip, #0\n" \
+" blmi " #fail "\n" \
+" mov %0, ip" \
+ : "=&r" (result) \
+ : "r" (ptr) \
+ : "ip", "lr", "cc"); \
+ result; \
+ })
+
+#define __up_op(ptr,wake) \
+ ({ \
+ __asm__ __volatile__ ( \
+ "@ up_op\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+" ldr lr, [%0]\n" \
+" and ip, ip, #0x0c000003\n" \
+" adds lr, lr, #1\n" \
+" str lr, [%0]\n" \
+" orrle ip, ip, #0x80000000 @ set N - should this be mi ??? DAG ! \n" \
+" teqp ip, #0\n" \
+" movmi ip, %0\n" \
+" blmi " #wake \
+ : \
+ : "r" (ptr) \
+ : "ip", "lr", "cc"); \
+ })
+
+/*
+ * The value 0x01000000 supports up to 128 processors and
+ * lots of processes. BIAS must be chosen such that sub'ing
+ * BIAS once per CPU will result in the long remaining
+ * negative.
+ */
+#define RW_LOCK_BIAS 0x01000000
+#define RW_LOCK_BIAS_STR "0x01000000"
+
+/* Decrements by RW_LOCK_BIAS rather than 1, fails if value != 0 */
+#define __down_op_write(ptr,fail) \
+ ({ \
+ __asm__ __volatile__( \
+ "@ down_op_write\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+" and ip, ip, #0x0c000003\n" \
+\
+" ldr lr, [%0]\n" \
+" subs lr, lr, %1\n" \
+" str lr, [%0]\n" \
+\
+" orreq ip, ip, #0x40000000 @ set Z \n"\
+" teqp ip, #0\n" \
+" movne ip, %0\n" \
+" blne " #fail \
+ : \
+ : "r" (ptr), "I" (RW_LOCK_BIAS) \
+ : "ip", "lr", "cc"); \
+ })
+
+/* Increments by RW_LOCK_BIAS, wakes if value >= 0 */
+#define __up_op_write(ptr,wake) \
+ ({ \
+ __asm__ __volatile__( \
+ "@ up_op_read\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+\
+" ldr lr, [%0]\n" \
+" and ip, ip, #0x0c000003\n" \
+" adds lr, lr, %1\n" \
+" str lr, [%0]\n" \
+\
+" orrcs ip, ip, #0x20000000 @ set C\n" \
+" teqp ip, #0\n" \
+" movcs ip, %0\n" \
+" blcs " #wake \
+ : \
+ : "r" (ptr), "I" (RW_LOCK_BIAS) \
+ : "ip", "lr", "cc"); \
+ })
+
+#define __down_op_read(ptr,fail) \
+ __down_op(ptr, fail)
+
+#define __up_op_read(ptr,wake) \
+ ({ \
+ __asm__ __volatile__( \
+ "@ up_op_read\n" \
+" mov ip, pc\n" \
+" orr lr, ip, #0x08000000\n" \
+" teqp lr, #0\n" \
+\
+" ldr lr, [%0]\n" \
+" and ip, ip, #0x0c000003\n" \
+" adds lr, lr, %1\n" \
+" str lr, [%0]\n" \
+\
+" orreq ip, ip, #0x40000000 @ Set Z \n" \
+" teqp ip, #0\n" \
+" moveq ip, %0\n" \
+" bleq " #wake \
+ : \
+ : "r" (ptr), "I" (1) \
+ : "ip", "lr", "cc"); \
+ })
+
+#endif