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From: Wu Zhangjin <wuzj@lemote.com>
the gcc 4.4 support for MIPS mostly refer to this PATCH:
http://www.nabble.com/-PATCH--MIPS:-Handle-removal-of-%27h%27-constraint-in-GCC-4.4-td22192768.html
but have been tuned a little.
because only gcc 4.4 have loongson-specific support, so, we need to
choose the suitable -march argument for gcc <= 4.3 and gcc >= 4.4, and
we also need to consider use -march=loongson2e and -march=loongson2f for
loongson2e and loongson2f respectively. this is handled by adding two
new kernel options: CPU_LOONGSON2E and CPU_LOONGSON2F(thanks for the
solutin provided by ZhangLe).
I have tested it on FuLoong(2f) in 32bit and 64bit with gcc-4.4 and
gcc-4.3. so, basically, it works.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
arch/mips/Makefile | 9 +++++-
arch/mips/include/asm/compiler.h | 10 ++++++
arch/mips/include/asm/delay.h | 58 +++++++++++++++++++++++++------------
3 files changed, 57 insertions(+), 20 deletions(-)
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -119,7 +119,14 @@ cflags-$(CONFIG_CPU_R4300) += -march=r43
cflags-$(CONFIG_CPU_VR41XX) += -march=r4100 -Wa,--trap
cflags-$(CONFIG_CPU_R4X00) += -march=r4600 -Wa,--trap
cflags-$(CONFIG_CPU_TX49XX) += -march=r4600 -Wa,--trap
-cflags-$(CONFIG_CPU_LOONGSON2) += -march=r4600 -Wa,--trap
+
+# only gcc >= 4.4 have the loongson-specific support
+cflags-$(CONFIG_CPU_LOONGSON2) += -Wa,--trap
+cflags-$(CONFIG_CPU_LOONGSON2E) += $(shell if [ $(call cc-version) -lt 0440 ] ; then \
+ echo $(call cc-option,-march=r4600); else echo $(call cc-option,-march=loongson2e); fi ;)
+cflags-$(CONFIG_CPU_LOONGSON2F) += $(shell if [ $(call cc-version) -lt 0440 ] ; then \
+ echo $(call cc-option,-march=r4600); else echo $(call cc-option,-march=loongson2f); fi ;)
+
cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
--- a/include/asm-mips/compiler.h
+++ b/include/asm-mips/compiler.h
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2004, 2007 Maciej W. Rozycki
+ * Copyright (C) 2009 Wu Zhangjin, wuzj@lemote.com
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -16,4 +17,13 @@
#define GCC_REG_ACCUM "accum"
#endif
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
+#define GCC_NO_H_CONSTRAINT
+#ifdef CONFIG_64BIT
+typedef unsigned int uintx_t __attribute__((mode(TI)));
+#else
+typedef u64 uintx_t;
+#endif
+#endif
+
#endif /* _ASM_COMPILER_H */
--- a/include/asm-mips/delay.h
+++ b/include/asm-mips/delay.h
@@ -7,6 +7,7 @@
* Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2007 Maciej W. Rozycki
+ * Copyright (C) 2009 Wu Zhangjin, wuzj@lemote.com
*/
#ifndef _ASM_DELAY_H
#define _ASM_DELAY_H
@@ -48,6 +49,43 @@ static inline void __delay(unsigned long
: "0" (loops), "r" (1));
}
+/*
+ * convert usecs to loops
+ *
+ * handle removal of 'h' constraint in GCC 4.4
+ */
+
+#ifndef GCC_NO_H_CONSTRAINT /* gcc <= 4.3 */
+static inline unsigned long __usecs_to_loops(unsigned long usecs,
+ unsigned long lpj)
+{
+ unsigned long hi, lo;
+
+ if (sizeof(long) == 4)
+ __asm__("multu\t%2, %3"
+ : "=h" (usecs), "=l" (lo)
+ : "r" (usecs), "r" (lpj)
+ : GCC_REG_ACCUM);
+ else if (sizeof(long) == 8 && !R4000_WAR)
+ __asm__("dmultu\t%2, %3"
+ : "=h" (usecs), "=l" (lo)
+ : "r" (usecs), "r" (lpj)
+ : GCC_REG_ACCUM);
+ else if (sizeof(long) == 8 && R4000_WAR)
+ __asm__("dmultu\t%3, %4\n\tmfhi\t%0"
+ : "=r" (usecs), "=h" (hi), "=l" (lo)
+ : "r" (usecs), "r" (lpj)
+ : GCC_REG_ACCUM);
+
+ return usecs;
+}
+#else /* GCC_NO_H_CONSTRAINT, gcc >= 4.4 */
+static inline unsigned long __usecs_to_loops(unsigned long usecs,
+ unsigned long lpj)
+{
+ return ((uintx_t)usecs * lpj) >> BITS_PER_LONG;
+}
+#endif
/*
* Division by multiplication: you don't have to worry about
@@ -62,8 +100,6 @@ static inline void __delay(unsigned long
static inline void __udelay(unsigned long usecs, unsigned long lpj)
{
- unsigned long hi, lo;
-
/*
* The rates of 128 is rounded wrongly by the catchall case
* for 64-bit. Excessive precission? Probably ...
@@ -77,23 +113,7 @@ static inline void __udelay(unsigned lon
0x80000000ULL) >> 32);
#endif
- if (sizeof(long) == 4)
- __asm__("multu\t%2, %3"
- : "=h" (usecs), "=l" (lo)
- : "r" (usecs), "r" (lpj)
- : GCC_REG_ACCUM);
- else if (sizeof(long) == 8 && !R4000_WAR)
- __asm__("dmultu\t%2, %3"
- : "=h" (usecs), "=l" (lo)
- : "r" (usecs), "r" (lpj)
- : GCC_REG_ACCUM);
- else if (sizeof(long) == 8 && R4000_WAR)
- __asm__("dmultu\t%3, %4\n\tmfhi\t%0"
- : "=r" (usecs), "=h" (hi), "=l" (lo)
- : "r" (usecs), "r" (lpj)
- : GCC_REG_ACCUM);
-
- __delay(usecs);
+ __delay(__usecs_to_loops(usecs, lpj));
}
#define __udelay_val cpu_data[raw_smp_processor_id()].udelay_val
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