diff --git a/hdf/src/atom.h b/hdf/src/atom.h
index 7617bd0..4253c78 100644
--- a/hdf/src/atom.h
+++ b/hdf/src/atom.h
@@ -34,7 +34,9 @@
 #define HASH_SIZE_POWER_2
 
 /* Define the following macro for atom caching over all the atoms */
+#if !defined(__loongarch__) && !defined(__sw_64__)
 #define ATOMS_ARE_CACHED
+#endif
 
 /* Define the following macro for "inline" atom lookups from the cache */
 #ifdef ATOMS_ARE_CACHED     /* required for this to work */
diff --git a/hdf/src/hconv.h b/hdf/src/hconv.h
index d6a8748..2179f5b 100644
--- a/hdf/src/hconv.h
+++ b/hdf/src/hconv.h
@@ -59,7 +59,7 @@
 /* CONSTANT DEFINITIONS                                                      */
 /*****************************************************************************/
 /* Generally Big-Endian machines */
-#if !defined(INTEL86) && !defined(MIPSEL) && !defined(DEC_ALPHA) && !defined(I860) && !defined(SUN386) && !(defined(__ia64) && !(defined(hpux) || defined(__hpux))) && !defined(__x86_64__) && !defined(__arm__) && !defined(__AARCH64EL__) && !defined(__LITTLE_ENDIAN__)
+#if !defined(INTEL86) && !defined(MIPSEL) && !defined(DEC_ALPHA) && !defined(I860) && !defined(SUN386) && !(defined(__ia64) && !(defined(hpux) || defined(__hpux))) && !defined(__x86_64__) && !defined(__arm__) && !defined(__AARCH64EL__) && !defined(__loongarch__) && !defined(__sw_64__) && !defined(__LITTLE_ENDIAN__)
 #       define UI8_IN     DFKnb1b   /* Unsigned Integer, 8 bits */
 #       define UI8_OUT    DFKnb1b
 #       define SI16_IN    DFKnb2b   /* S = Signed */
diff --git a/hdf/src/hdfi.h b/hdf/src/hdfi.h
index 42673a7..12c9fff 100644
--- a/hdf/src/hdfi.h
+++ b/hdf/src/hdfi.h
@@ -62,6 +62,7 @@
 #define     DFMT_CTSS           0x3331
 #define     DFMT_VAX            0x2221
 #define     DFMT_MIPSEL         0x4441
+#define     DFMT_LOONGARCH      0x4441
 #define     DFMT_PC             0x4441
 #define     DFMT_APPLE          0x1111
 #define     DFMT_APPLE_INTEL    0x4441
@@ -70,6 +71,7 @@
 #define     DFMT_NEXT           0x1111
 #define     DFMT_MOTOROLA       0x1111
 #define     DFMT_ALPHA          0x4441
+#define     DFMT_SW_64          0x4441
 #define     DFMT_VP             0x6611
 #define     DFMT_I860           0x4441
 #define     DFMT_IA64           0x4441
@@ -1248,6 +1250,108 @@ typedef int               hdf_pint_t;   /* an integer the same size as a pointer
 
 #endif /* Linux ARM */
 
+/* Linux LOONGARCH */
+#if defined __loongarch__
+
+#ifdef GOT_MACHINE
+If you get an error on this line more than one machine type has been defined.
+Please check your Makefile.
+#endif
+#define GOT_MACHINE
+
+#include <sys/file.h>               /* for unbuffered i/o stuff */
+#include <sys/stat.h>
+#define DF_MT             DFMT_LOONGARCH
+typedef void              VOID;
+typedef void              *VOIDP;
+typedef char              *_fcd;
+typedef char              char8;
+typedef unsigned char     uchar8;
+typedef char              int8;
+typedef unsigned char     uint8;
+typedef short int         int16;
+typedef unsigned short int uint16;
+typedef long int          int32;
+typedef unsigned long int uint32;
+typedef int               intn;
+typedef unsigned int      uintn;
+typedef int               intf;     /* size of INTEGERs in Fortran compiler */
+typedef float             float32;
+typedef double            float64;
+typedef int               hdf_pint_t;   /* an integer the same size as a pointer */
+#define FNAME_POST_UNDERSCORE
+#define _fcdtocp(desc) (desc)
+#ifdef  HAVE_FMPOOL
+#define FILELIB PAGEBUFIO  /* enable page buffering */
+#else
+#define FILELIB UNIXBUFIO
+#endif
+
+/* JPEG #define's - Look in the JPEG docs before changing - (Q) */
+
+/* Determine the memory manager we are going to use. Valid values are: */
+/*  MEM_DOS, MEM_ANSI, MEM_NAME, MEM_NOBS.  See the JPEG docs for details on */
+/*  what each does */
+#define JMEMSYS         MEM_ANSI
+
+#ifdef __GNUC__
+#define HAVE_STDC
+#define INCLUDES_ARE_ANSI
+#endif
+
+#endif /* Linux LOONGARCH */
+
+/* Linux SW_64 */
+#if defined __sw_64__
+
+#ifdef GOT_MACHINE
+If you get an error on this line more than one machine type has been defined.
+Please check your Makefile.
+#endif
+#define GOT_MACHINE
+
+#include <sys/file.h>               /* for unbuffered i/o stuff */
+#include <sys/stat.h>
+#define DF_MT             DFMT_SW_64
+typedef void              VOID;
+typedef void              *VOIDP;
+typedef char              *_fcd;
+typedef char              char8;
+typedef unsigned char     uchar8;
+typedef char              int8;
+typedef unsigned char     uint8;
+typedef short int         int16;
+typedef unsigned short int uint16;
+typedef long int          int32;
+typedef unsigned long int uint32;
+typedef int               intn;
+typedef unsigned int      uintn;
+typedef int               intf;     /* size of INTEGERs in Fortran compiler */
+typedef float             float32;
+typedef double            float64;
+typedef int               hdf_pint_t;   /* an integer the same size as a pointer */
+#define FNAME_POST_UNDERSCORE
+#define _fcdtocp(desc) (desc)
+#ifdef  HAVE_FMPOOL
+#define FILELIB PAGEBUFIO  /* enable page buffering */
+#else
+#define FILELIB UNIXBUFIO
+#endif
+
+/* JPEG #define's - Look in the JPEG docs before changing - (Q) */
+
+/* Determine the memory manager we are going to use. Valid values are: */
+/*  MEM_DOS, MEM_ANSI, MEM_NAME, MEM_NOBS.  See the JPEG docs for details on */
+/*  what each does */
+#define JMEMSYS         MEM_ANSI
+
+#ifdef __GNUC__
+#define HAVE_STDC
+#define INCLUDES_ARE_ANSI
+#endif
+
+#endif /* Linux SW_64 */
+
 /*-----------------------------------------------------*/
 /* 64-bit Free BSD */