1 files changed, 53 insertions, 1 deletions

diff --git a/include/asm-mips/hazards.h b/include/asm-mips/hazards.h
index 7e843b5fee92..2de638f84c86 100644
--- a/include/asm-mips/hazards.h
+++ b/include/asm-mips/hazards.h
@@ -10,11 +10,12 @@
 #ifndef _ASM_HAZARDS_H
 #define _ASM_HAZARDS_H
 
-
 #ifdef __ASSEMBLY__
 #define ASMMACRO(name, code...) .macro name; code; .endm
 #else
 
+#include <asm/cpu-features.h>
+
 #define ASMMACRO(name, code...)                                         \
 __asm__(".macro " #name "; " #code "; .endm");                          \
                                                                         \
@@ -86,6 +87,57 @@ do {									\
         : "=r" (tmp));                                                  \
 } while (0)
 
+#elif defined(CONFIG_CPU_MIPSR1)
+
+/*
+ * These are slightly complicated by the fact that we guarantee R1 kernels to
+ * run fine on R2 processors.
+ */
+ASMMACRO(mtc0_tlbw_hazard,
+        _ssnop; _ssnop; _ehb
+        )
+ASMMACRO(tlbw_use_hazard,
+        _ssnop; _ssnop; _ssnop; _ehb
+        )
+ASMMACRO(tlb_probe_hazard,
+         _ssnop; _ssnop; _ssnop; _ehb
+        )
+ASMMACRO(irq_enable_hazard,
+         _ssnop; _ssnop; _ssnop; _ehb
+        )
+ASMMACRO(irq_disable_hazard,
+        _ssnop; _ssnop; _ssnop; _ehb
+        )
+ASMMACRO(back_to_back_c0_hazard,
+         _ssnop; _ssnop; _ssnop; _ehb
+        )
+/*
+ * gcc has a tradition of misscompiling the previous construct using the
+ * address of a label as argument to inline assembler.  Gas otoh has the
+ * annoying difference between la and dla which are only usable for 32-bit
+ * rsp. 64-bit code, so can't be used without conditional compilation.
+ * The alterantive is switching the assembler to 64-bit code which happens
+ * to work right even for 32-bit code ...
+ */
+#define __instruction_hazard()                                          \
+do {                                                                    \
+        unsigned long tmp;                                              \
+                                                                        \
+        __asm__ __volatile__(                                           \
+        "       .set    mips64r2                                \n"     \
+        "       dla     %0, 1f                                  \n"     \
+        "       jr.hb   %0                                      \n"     \
+        "       .set    mips0                                   \n"     \
+        "1:                                                     \n"     \
+        : "=r" (tmp));                                                  \
+} while (0)
+
+#define instruction_hazard()                                            \
+do {                                                                    \
+        if (cpu_has_mips_r2)                                            \
+                __instruction_hazard();                                 \
+} while (0)
+
 #elif defined(CONFIG_CPU_R10000)
 
 /*