diff --git a/README.md b/README.md
index b1cbf5c..72c8f2a 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 Detect CPU ISA features with single-file
 
 <table>
-<tr><td>CPU</td><td>&#9989; x86, x86-64<br/>&#9989; arm, aarch64<br/>&#9989; mips<br/>&#9989; powerpc<br/>&#9989; s390x<br/>&#9989; loongarch<br/>&#9989; risc-v</td><td rowspan=3>
+<tr><td>CPU</td><td>&#9989; x86, x86-64<br/>&#9989; arm, aarch64<br/>&#9989; mips<br/>&#9989; powerpc<br/>&#9989; s390x<br/>&#9989; loongarch<br/>&#9989; risc-v<br/>&#9989; openrisc</td><td rowspan=3>
   
 ```c
 #define RUAPU_IMPLEMENTATION
@@ -267,6 +267,7 @@ _`fma4` on zen1, ISA in hypervisor, etc._
 |s390x|`zvector`|
 |loongarch|`lsx` `lasx`|
 |risc-v|`i` `m` `a` `f` `d` `c` `zfa` `zfh` `zfhmin` `zicsr` `zifencei` `zmmul` |
+|openrisc| `orbis32` `orbis64` `orfpx32` `orfpx64` `orvdx64` |
 
 ## Techniques inside ruapu
 ruapu is implemented in C language to ensure the widest possible portability.
diff --git a/main.c b/main.c
index 5363a4d..31ab095 100644
--- a/main.c
+++ b/main.c
@@ -104,6 +104,13 @@ int main()
     PRINT_ISA_SUPPORT(zicsr)
     PRINT_ISA_SUPPORT(zifencei)
 
+#elif __openrisc__
+    PRINT_ISA_SUPPORT(orbis32)
+    PRINT_ISA_SUPPORT(orbis64)
+    PRINT_ISA_SUPPORT(orfpx32)
+    PRINT_ISA_SUPPORT(orfpx64)
+    PRINT_ISA_SUPPORT(orvdx64)
+
 #endif
 
     return 0;
diff --git a/ruapu.h b/ruapu.h
index 59c791b..91e991a 100644
--- a/ruapu.h
+++ b/ruapu.h
@@ -358,11 +358,31 @@ RUAPU_ISAENTRY(zicsr)
 RUAPU_ISAENTRY(zifencei)
 RUAPU_ISAENTRY(zmmul)
 
+#elif __openrisc__
+RUAPU_ISAENTRY(orbis32)
+RUAPU_ISAENTRY(orbis64)
+RUAPU_ISAENTRY(orfpx32)
+RUAPU_ISAENTRY(orfpx64)
+RUAPU_ISAENTRY(orvdx64)
+
 #endif
 };
 
 #undef RUAPU_ISAENTRY
 
+#if defined __openrisc__
+static void ruapu_detect_openrisc_isa()
+{
+    uint32_t value;
+    uint16_t addr = U(0x0000);
+    asm volatile ("l.mfspr %0, r0, %1" : "=r" (value) : "K" (addr));
+    for (size_t i = 0; i < sizeof(g_ruapu_isa_map) / sizeof(g_ruapu_isa_map[0]); i++)
+    {
+        g_ruapu_isa_map[0].capable = ((value) >> (5 + i)) & 0x1;
+    }
+}
+#endif
+
 void ruapu_init()
 {
 #if defined _WIN32 || defined __ANDROID__ || defined __linux__ || defined __APPLE__ || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__
@@ -370,7 +390,9 @@ void ruapu_init()
     {
         g_ruapu_isa_map[i].capable = ruapu_detect_isa(g_ruapu_isa_map[i].inst);
     }
-#else
+#elif defined __openrisc__
+    ruapu_detect_openrisc_isa();
+#else 
     // initialize g_ruapu_isa_map for baremetal here, default all zero
     // there is still ruapu_some_XYZ() functions available
     // but you have to work out your own signal handling