给linux内核的mips malta board添加MIPS 64 Release 2架构支持

　　linux内核中的malta board代码只支持MIPS32R1,MIPS32R2和MIPS64R1这几种架构的CPU，如果我想要支持MIPS64R2怎么办？直接使用-march=mips64r2编译是不行的，会启动不起来，需要对内核打一些补丁，其实也比较简单，我这里就不废话直接贴patch了：

---
 arch/mips/Kconfig            |    7 +++++++
 arch/mips/include/asm/cpu.h  |    2 +-
 arch/mips/kernel/cpu-probe.c |    4 ++++
 arch/mips/kernel/traps.c     |    1 +
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d0570f4..862a9c3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -282,6 +282,7 @@ config MIPS_MALTA
        select SYS_HAS_CPU_MIPS32_R1
        select SYS_HAS_CPU_MIPS32_R2
        select SYS_HAS_CPU_MIPS64_R1
+       select SYS_HAS_CPU_MIPS64_R2
        select SYS_HAS_CPU_NEVADA
        select SYS_HAS_CPU_RM7000
        select SYS_HAS_EARLY_PRINTK
@@ -2488,6 +2489,7 @@ config TRAD_SIGNALS
 config MIPS32_COMPAT
        bool "Kernel support for Linux/MIPS 32-bit binary compatibility"
        depends on 64BIT
+       default y if CPU_SUPPORTS_32BIT_KERNEL && SYS_SUPPORTS_32BIT_KERNEL
        help
          Select this option if you want Linux/MIPS 32-bit binary
          compatibility. Since all software available for Linux/MIPS is
@@ -2507,6 +2509,7 @@ config SYSVIPC_COMPAT
 config MIPS32_O32
        bool "Kernel support for o32 binaries"
        depends on MIPS32_COMPAT
+       default y if CPU_SUPPORTS_32BIT_KERNEL && SYS_SUPPORTS_32BIT_KERNEL
        help
          Select this option if you want to run o32 binaries.  These are pure
          32-bit binaries as used by the 32-bit Linux/MIPS port.  Most of
@@ -2525,6 +2528,10 @@ config MIPS32_N32
 
          If unsure, say N.
 
+comment "64bit kernel, but support of 32bit applications is disabled!"
+       depends on 64BIT && !MIPS32_O32 && !MIPS32_N32
+       depends on CPU_SUPPORTS_32BIT_KERNEL && SYS_SUPPORTS_32BIT_KERNEL
+
 config BINFMT_ELF32
        bool
        default y if MIPS32_O32 || MIPS32_N32
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index 0a619f8..559bd12 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -268,7 +268,7 @@ enum cpu_type_enum {
        /*
         * MIPS64 class processors
         */
-       CPU_5KC, CPU_20KC, CPU_25KF, CPU_SB1, CPU_SB1A, CPU_LOONGSON2,
+       CPU_5KC, CPU_5KE, CPU_20KC, CPU_25KF, CPU_SB1, CPU_SB1A, CPU_LOONGSON2,
        CPU_CAVIUM_OCTEON, CPU_CAVIUM_OCTEON_PLUS, CPU_CAVIUM_OCTEON2,
        CPU_XLR, CPU_XLP,
 
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index e5f0b27..fe76d60 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -817,6 +817,10 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c, 
unsigned int cpu)
                c->cputype = CPU_5KC;
                __cpu_name[cpu] = "MIPS 5Kc";
                break;
+       case PRID_IMP_5KE:
+               c->cputype = CPU_5KE;
+               __cpu_name[cpu] = "MIPS 5KE";
+               break;
        case PRID_IMP_20KC:
                c->cputype = CPU_20KC;
                __cpu_name[cpu] = "MIPS 20Kc";
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 7bec6f8..a69edbe 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1349,6 +1349,7 @@ static inline void parity_protection_init(void)
                break;
 
        case CPU_5KC:
+       case CPU_5KE:
                write_c0_ecc(0x80000000);
                back_to_back_c0_hazard();
                /* Set the PE bit (bit 31) in the c0_errctl register. */