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Subject[RFC PATCH 01/17] tools: Add some generic functions and headers
Date
These will be needed to be able to use arm64 instruction decoder in
userland tools.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/include/asm-generic/bitops/__ffs.h | 11 +++++++
tools/include/linux/kernel.h | 21 +++++++++++++
tools/include/linux/printk.h | 40 ++++++++++++++++++++++++
3 files changed, 72 insertions(+)
create mode 100644 tools/include/linux/printk.h

diff --git a/tools/include/asm-generic/bitops/__ffs.h b/tools/include/asm-generic/bitops/__ffs.h
index 9d1310519497..963f8a22212f 100644
--- a/tools/include/asm-generic/bitops/__ffs.h
+++ b/tools/include/asm-generic/bitops/__ffs.h
@@ -42,4 +42,15 @@ static __always_inline unsigned long __ffs(unsigned long word)
return num;
}

+static inline unsigned long __ffs64(u64 word)
+{
+#if BITS_PER_LONG == 32
+ if (((u32)word) == 0UL)
+ return __ffs((u32)(word >> 32)) + 32;
+#elif BITS_PER_LONG != 64
+#error BITS_PER_LONG not 32 or 64
+#endif
+ return __ffs((unsigned long)word);
+}
+
#endif /* _TOOLS_LINUX_ASM_GENERIC_BITOPS___FFS_H_ */
diff --git a/tools/include/linux/kernel.h b/tools/include/linux/kernel.h
index a7e54a08fb54..e748982ed5c1 100644
--- a/tools/include/linux/kernel.h
+++ b/tools/include/linux/kernel.h
@@ -114,6 +114,27 @@ int scnprintf_pad(char * buf, size_t size, const char * fmt, ...);
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
#define round_down(x, y) ((x) & ~__round_mask(x, y))

+/**
+ * upper_32_bits - return bits 32-63 of a number
+ * @n: the number we're accessing
+ *
+ * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
+ * the "right shift count >= width of type" warning when that quantity is
+ * 32-bits.
+ */
+#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
+
+/**
+ * lower_32_bits - return bits 0-31 of a number
+ * @n: the number we're accessing
+ */
+#define lower_32_bits(n) ((u32)(n))
+
+/* Inspired from ALIGN_*_KERNEL */
+#define __ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
+#define __ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a) - 1)
+#define ALIGN_DOWN(x, a) __ALIGN((x) - ((a) - 1), (a))
+
#define current_gfp_context(k) 0
#define synchronize_rcu()

diff --git a/tools/include/linux/printk.h b/tools/include/linux/printk.h
new file mode 100644
index 000000000000..515ebdc47e6e
--- /dev/null
+++ b/tools/include/linux/printk.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_KERNEL_PRINTK_H_
+#define _TOOLS_LINUX_KERNEL_PRINTK_H_
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define printk(fmt, ...) fprintf(stdout, fmt, ##__VA_ARGS__)
+#define pr_info printk
+#define pr_notice printk
+#define pr_cont printk
+
+#define pr_warn(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)
+#define pr_err pr_warn
+#define pr_alert pr_warn
+#define pr_emerg pr_warn
+#define pr_crit pr_warn
+
+/*
+ * Dummy printk for disabled debugging statements to use whilst maintaining
+ * gcc's format checking.
+ */
+#define no_printk(fmt, ...) \
+({ \
+ if (0) \
+ printk(fmt, ##__VA_ARGS__); \
+ 0; \
+})
+
+/* pr_devel() should produce zero code unless DEBUG is defined */
+#ifdef DEBUG
+#define pr_devel(fmt, ...) printk
+#else
+#define pr_devel(fmt, ...) no_printk
+#endif
+
+#define pr_debug pr_devel
+
+#endif /* _TOOLS_LINUX_KERNEL_PRINTK_H_ */
--
2.25.4
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