-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
-@@ -120,7 +120,14 @@ 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/arch/mips/include/asm/compiler.h
-+++ b/arch/mips/include/asm/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/arch/mips/include/asm/delay.h
-+++ b/arch/mips/include/asm/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
projects / openwrt.git / commitdiff