diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.29')
-rw-r--r-- | target/linux/generic-2.6/patches-2.6.29/023-mips_delay_gcc4.4.0.patch | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.29/023-mips_delay_gcc4.4.0.patch b/target/linux/generic-2.6/patches-2.6.29/023-mips_delay_gcc4.4.0.patch new file mode 100644 index 000000000..ed95bcdc1 --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.29/023-mips_delay_gcc4.4.0.patch @@ -0,0 +1,163 @@ +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(-) + +diff --git a/arch/mips/Makefile b/arch/mips/Makefile +index a25c2e5..1ee5504 100644 +--- a/arch/mips/Makefile ++++ b/arch/mips/Makefile +@@ -120,7 +120,14 @@ cflags-$(CONFIG_CPU_R4300) += -march=r4300 -Wa,--trap + cflags-$(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) \ +diff --git a/arch/mips/include/asm/compiler.h b/arch/mips/include/asm/compiler.h +index 71f5c5c..95256a8 100644 +--- 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 */ +diff --git a/arch/mips/include/asm/delay.h b/arch/mips/include/asm/delay.h +index b0bccd2..00d7969 100644 +--- 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 loops) + : "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 loops) + + 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 long usecs, unsigned long lpj) + 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 +-- +1.6.0.4 + + + |