[loong64] Add initial support for LoongArch64

Add support for building a LoongArch64 Linux userspace binary.

Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/loong64/include/bits/acpi.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_ACPI_H
+#define _BITS_ACPI_H
+
+/** @file
+ *
+ * LoongArch64-specific ACPI API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_ACPI_H */

src/arch/loong64/include/bits/bigint.h

@@ -0,0 +1,336 @@
+#ifndef _BITS_BIGINT_H
+#define _BITS_BIGINT_H
+
+/** @file
+ *
+ * Big integer support
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <string.h>
+#include <strings.h>
+
+/** Element of a big integer */
+typedef uint64_t bigint_element_t;
+
+/**
+ * Initialise big integer
+ *
+ * @v value0	Element 0 of big integer to initialise
+ * @v size		Number of elements
+ * @v data		Raw data
+ * @v len		Length of raw data
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_init_raw ( uint64_t *value0, unsigned int size,
+		  const void *data, size_t len ) {
+	size_t pad_len = ( sizeof ( bigint_t ( size ) ) - len );
+	uint8_t *value_byte = ( ( void * ) value0 );
+	const uint8_t *data_byte = ( data + len );
+
+	/* Copy raw data in reverse order, padding with zeros */
+	while ( len-- )
+		*(value_byte++) = *(--data_byte);
+	while ( pad_len-- )
+		*(value_byte++) = 0;
+}
+
+/**
+ * Add big integers
+ *
+ * @v addend0		Element 0 of big integer to add
+ * @v value0		Element 0 of big integer to be added to
+ * @v size		Number of elements
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_add_raw ( const uint64_t *addend0, uint64_t *value0,
+		 unsigned int size ) {
+	bigint_t ( size ) __attribute__ (( may_alias )) *value =
+		( ( void * ) value0 );
+	uint64_t *discard_addend;
+	uint64_t *discard_value;
+	uint64_t discard_addend_i;
+	uint64_t discard_value_i;
+	unsigned int discard_size;
+	__asm__ __volatile__ ( "move   $t0, $zero\n"
+			       "1:\n\t"
+			       "ld.d   %3, %0, 0\n\t"
+			       "addi.d %0, %0, 8\n\t"
+			       "ld.d   %4, %1, 0\n\t"
+
+			       "add.d  %4, %4, $t0\n\t"
+			       "sltu   $t0, %4, $t0\n\t"
+
+			       "add.d  %4, %4, %3\n\t"
+			       "sltu   $t1, %4, %3\n\t"
+
+			       "or     $t0, $t0, $t1\n\t"
+			       "st.d   %4,  %1, 0\n\t"
+			       "addi.d %1, %1, 8\n\t"
+			       "addi.w %2, %2, -1\n\t"
+			       "bnez   %2, 1b"
+			       : "=r" ( discard_addend ),
+				 "=r" ( discard_value ),
+				 "=r" ( discard_size ),
+				 "=r" ( discard_addend_i ),
+				 "=r" ( discard_value_i ),
+				 "+m" ( *value )
+			       : "0" ( addend0 ),
+				 "1" ( value0 ),
+				 "2" ( size )
+			       : "t0", "t1" );
+}
+
+/**
+ * Subtract big integers
+ *
+ * @v subtrahend0	Element 0 of big integer to subtract
+ * @v value0		Element 0 of big integer to be subtracted from
+ * @v size		Number of elements
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_subtract_raw ( const uint64_t *subtrahend0, uint64_t *value0,
+		      unsigned int size ) {
+	uint64_t *discard_subtrahend;
+	uint64_t *discard_value;
+	uint64_t discard_subtrahend_i;
+	uint64_t discard_value_i;
+	unsigned int discard_size;
+	unsigned int flag = 0;
+
+	discard_subtrahend = (uint64_t*) subtrahend0;
+	discard_value = value0;
+	discard_size = size;
+
+	do {
+		discard_subtrahend_i = *discard_subtrahend;
+		discard_subtrahend++;
+		discard_value_i = *discard_value;
+
+		discard_value_i = discard_value_i - discard_subtrahend_i - flag;
+
+		if ( *discard_value < (discard_subtrahend_i + flag)) {
+			flag = 1;
+		} else {
+			flag = 0;
+		}
+
+		*discard_value = discard_value_i;
+
+		discard_value++;
+		discard_size -= 1;
+	} while (discard_size != 0);
+}
+
+/**
+ * Rotate big integer left
+ *
+ * @v value0		Element 0 of big integer
+ * @v size		Number of elements
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_rol_raw ( uint64_t *value0, unsigned int size ) {
+	uint64_t *discard_value;
+	uint64_t discard_value_i;
+	unsigned int discard_size;
+	uint64_t current_value_i;
+	unsigned int flag = 0;
+
+	discard_value = value0;
+	discard_size = size;
+	do {
+		discard_value_i = *discard_value;
+		current_value_i = discard_value_i;
+
+		discard_value_i += discard_value_i + flag;
+
+		if (discard_value_i < current_value_i) {
+			flag = 1;
+		} else {
+			flag = 0;
+		}
+
+		*discard_value = discard_value_i;
+		discard_value++;
+		discard_size -= 1;
+	} while ( discard_size != 0 );
+}
+
+/**
+ * Rotate big integer right
+ *
+ * @v value0		Element 0 of big integer
+ * @v size		Number of elements
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_ror_raw ( uint64_t *value0, unsigned int size ) {
+	uint64_t *discard_value;
+	uint64_t discard_value_i;
+	uint64_t discard_value_j;
+	unsigned int discard_size;
+
+	discard_value = value0;
+	discard_size = size;
+
+	discard_value_j = 0;
+
+	do {
+		discard_size -= 1;
+
+		discard_value_i = *(discard_value + discard_size);
+
+		discard_value_j = (discard_value_j << 63) | (discard_value_i >> 1);
+
+		*(discard_value + discard_size) = discard_value_j;
+
+		discard_value_j = discard_value_i;
+	} while ( discard_size > 0 );
+}
+
+/**
+ * Test if big integer is equal to zero
+ *
+ * @v value0		Element 0 of big integer
+ * @v size		Number of elements
+ * @ret is_zero		Big integer is equal to zero
+ */
+static inline __attribute__ (( always_inline, pure )) int
+bigint_is_zero_raw ( const uint64_t *value0, unsigned int size ) {
+	const uint64_t *value = value0;
+	uint64_t value_i;
+
+	do {
+		value_i = *(value++);
+		if ( value_i )
+			break;
+	} while ( --size );
+
+	return ( value_i == 0 );
+}
+
+/**
+ * Compare big integers
+ *
+ * @v value0		Element 0 of big integer
+ * @v reference0	Element 0 of reference big integer
+ * @v size		Number of elements
+ * @ret geq		Big integer is greater than or equal to the reference
+ */
+static inline __attribute__ (( always_inline, pure )) int
+bigint_is_geq_raw ( const uint64_t *value0, const uint64_t *reference0,
+		    unsigned int size ) {
+	const uint64_t *value = ( value0 + size );
+	const uint64_t *reference = ( reference0 + size );
+	uint64_t value_i;
+	uint64_t reference_i;
+
+	do {
+		value_i = *(--value);
+		reference_i = *(--reference);
+		if ( value_i != reference_i )
+			break;
+	} while ( --size );
+
+	return ( value_i >= reference_i );
+}
+
+/**
+ * Test if bit is set in big integer
+ *
+ * @v value0		Element 0 of big integer
+ * @v size		Number of elements
+ * @v bit		Bit to test
+ * @ret is_set		Bit is set
+ */
+static inline __attribute__ (( always_inline )) int
+bigint_bit_is_set_raw ( const uint64_t *value0, unsigned int size,
+			unsigned int bit ) {
+	const bigint_t ( size ) __attribute__ (( may_alias )) *value =
+		( ( const void * ) value0 );
+	unsigned int index = ( bit / ( 8 * sizeof ( value->element[0] ) ) );
+	unsigned int subindex = ( bit % ( 8 * sizeof ( value->element[0] ) ) );
+
+	return ( !! ( value->element[index] & ( 1UL << subindex ) ) );
+}
+
+/**
+ * Find highest bit set in big integer
+ *
+ * @v value0		Element 0 of big integer
+ * @v size		Number of elements
+ * @ret max_bit		Highest bit set + 1 (or 0 if no bits set)
+ */
+static inline __attribute__ (( always_inline )) int
+bigint_max_set_bit_raw ( const uint64_t *value0, unsigned int size ) {
+	const uint64_t *value = ( value0 + size );
+	int max_bit = ( 8 * sizeof ( bigint_t ( size ) ) );
+	uint64_t value_i;
+
+	do {
+		value_i = *(--value);
+		max_bit -= ( 64 - fls ( value_i ) );
+		if ( value_i )
+			break;
+	} while ( --size );
+
+	return max_bit;
+}
+
+/**
+ * Grow big integer
+ *
+ * @v source0		Element 0 of source big integer
+ * @v source_size	Number of elements in source big integer
+ * @v dest0		Element 0 of destination big integer
+ * @v dest_size		Number of elements in destination big integer
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_grow_raw ( const uint64_t *source0, unsigned int source_size,
+		  uint64_t *dest0, unsigned int dest_size ) {
+	unsigned int pad_size = ( dest_size - source_size );
+
+	memcpy ( dest0, source0, sizeof ( bigint_t ( source_size ) ) );
+	memset ( ( dest0 + source_size ), 0, sizeof ( bigint_t ( pad_size ) ) );
+}
+
+/**
+ * Shrink big integer
+ *
+ * @v source0		Element 0 of source big integer
+ * @v source_size	Number of elements in source big integer
+ * @v dest0		Element 0 of destination big integer
+ * @v dest_size		Number of elements in destination big integer
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_shrink_raw ( const uint64_t *source0, unsigned int source_size __unused,
+		    uint64_t *dest0, unsigned int dest_size ) {
+
+	memcpy ( dest0, source0, sizeof ( bigint_t ( dest_size ) ) );
+}
+
+/**
+ * Finalise big integer
+ *
+ * @v value0		Element 0 of big integer to finalise
+ * @v size		Number of elements
+ * @v out		Output buffer
+ * @v len		Length of output buffer
+ */
+static inline __attribute__ (( always_inline )) void
+bigint_done_raw ( const uint64_t *value0, unsigned int size __unused,
+		  void *out, size_t len ) {
+	const uint8_t *value_byte = ( ( const void * ) value0 );
+	uint8_t *out_byte = ( out + len );
+
+	/* Copy raw data in reverse order */
+	while ( len-- )
+		*(--out_byte) = *(value_byte++);
+}
+
+extern void bigint_multiply_raw ( const uint64_t *multiplicand0,
+				  const uint64_t *multiplier0,
+				  uint64_t *value0, unsigned int size );
+
+#endif /* _BITS_BIGINT_H */

src/arch/loong64/include/bits/bitops.h

@@ -0,0 +1,102 @@
+#ifndef _BITS_BITOPS_H
+#define _BITS_BITOPS_H
+
+/** @file
+ *
+ * loongArch bit operations
+ *
+ * We perform atomic bit set and bit clear operations using "ll"
+ * and "sc".  We use the output constraint to inform the
+ * compiler that any memory from the start of the bit field up to and
+ * including the byte containing the bit may be modified.  (This is
+ * overkill but shouldn't matter in practice since we're unlikely to
+ * subsequently read other bits from the same bit field.)
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+
+/**
+ * Test and set bit atomically
+ *
+ * @v bit		Bit to set
+ * @v bits		Bit field
+ * @ret old		Old value of bit (zero or non-zero)
+ */
+static inline __attribute__ (( always_inline )) int
+test_and_set_bit ( unsigned int bit, volatile void *bits ) {
+	unsigned int index = ( bit / 64 );
+	unsigned int offset = ( bit % 64 );
+	volatile uint64_t *qword = ( ( ( volatile uint64_t * ) bits ) + index );
+	uint64_t mask = ( 1UL << offset );
+	uint64_t old;
+	uint64_t new;
+
+	__asm__ __volatile__ ( "1:				\n\t"
+			       "ll.d %[old], %[qword]		\n\t"
+			       "or   %[new], %[old], %[mask]	\n\t"
+			       "sc.d %[new], %[qword]		\n\t"
+			       "beqz %[new], 1b			\n\t"
+			       : [old] "=&r" ( old ),
+				 [new] "=&r" ( new ),
+				 [qword] "+m" ( *qword )
+			       : [mask] "r" ( mask )
+			       : "cc", "memory");
+	return ( !! ( old & mask ) );
+}
+
+/**
+ * Test and clear bit atomically
+ *
+ * @v bit		Bit to set
+ * @v bits		Bit field
+ * @ret old		Old value of bit (zero or non-zero)
+ */
+static inline __attribute__ (( always_inline )) int
+test_and_clear_bit ( unsigned int bit, volatile void *bits ) {
+	unsigned int index = ( bit / 64 );
+	unsigned int offset = ( bit % 64 );
+	volatile uint64_t *qword = ( ( ( volatile uint64_t * ) bits ) + index );
+	uint64_t mask = ( 1UL << offset );
+	uint64_t old;
+	uint64_t new;
+
+	__asm__ __volatile__ ( "1:				\n\t"
+			       "ll.d %[old], %[qword]		\n\t"
+			       "andn %[new], %[old], %[mask]	\n\t"
+			       "sc.d %[new], %[qword]		\n\t"
+			       "beqz %[new], 1b			\n\t"
+			       : [old] "=&r" ( old ),
+				 [new] "=&r" ( new ),
+				 [qword] "+m" ( *qword )
+			       : [mask] "r" ( mask )
+			       : "cc", "memory");
+	return ( !! ( old & mask ) );
+}
+
+/**
+ * Set bit atomically
+ *
+ * @v bit		Bit to set
+ * @v bits		Bit field
+ */
+static inline __attribute__ (( always_inline )) void
+set_bit ( unsigned int bit, volatile void *bits ) {
+
+	test_and_set_bit ( bit, bits );
+}
+
+/**
+ * Clear bit atomically
+ *
+ * @v bit		Bit to set
+ * @v bits		Bit field
+ */
+static inline __attribute__ (( always_inline )) void
+clear_bit ( unsigned int bit, volatile void *bits ) {
+
+	test_and_clear_bit ( bit, bits );
+}
+
+#endif /* _BITS_BITOPS_H */

src/arch/loong64/include/bits/byteswap.h

@@ -0,0 +1,47 @@
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H
+
+/** @file
+ *
+ * Byte-order swapping functions
+ *
+ */
+
+#include <stdint.h>
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+static inline __attribute__ (( always_inline, const )) uint16_t
+__bswap_variable_16 ( uint16_t x ) {
+	__asm__ ( "revb.2h %0, %1" : "=r" ( x ) : "r" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_16s ( uint16_t *x ) {
+	*x = __bswap_variable_16 ( *x );
+}
+
+static inline __attribute__ (( always_inline, const )) uint32_t
+__bswap_variable_32 ( uint32_t x ) {
+	__asm__ ( "revb.2w %0, %1" : "=r" ( x ) : "r" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_32s ( uint32_t *x ) {
+	*x = __bswap_variable_32 ( *x );
+}
+
+static inline __attribute__ (( always_inline, const )) uint64_t
+__bswap_variable_64 ( uint64_t x ) {
+	__asm__ ( "revb.d %0, %1" : "=r" ( x ) : "r" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_64s ( uint64_t *x ) {
+	*x = __bswap_variable_64 ( *x );
+}
+
+#endif

src/arch/loong64/include/bits/compiler.h

@@ -0,0 +1,19 @@
+#ifndef _BITS_COMPILER_H
+#define _BITS_COMPILER_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** Dummy relocation type */
+#define RELOC_TYPE_NONE R_LARCH_NONE
+
+#ifndef ASSEMBLY
+
+/** Unprefixed constant operand modifier */
+#define ASM_NO_PREFIX "a"
+
+#define __asmcall
+#define __libgcc
+
+#endif /* ASSEMBLY */
+
+#endif /*_BITS_COMPILER_H */

src/arch/loong64/include/bits/endian.h

@@ -0,0 +1,8 @@
+#ifndef _BITS_ENDIAN_H
+#define _BITS_ENDIAN_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#define __BYTE_ORDER __LITTLE_ENDIAN
+
+#endif /* _BITS_ENDIAN_H */

src/arch/loong64/include/bits/entropy.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_ENTROPY_H
+#define _BITS_ENTROPY_H
+
+/** @file
+ *
+ * LoongArch64-specific entropy API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_ENTROPY_H */

src/arch/loong64/include/bits/errfile.h

@@ -0,0 +1,19 @@
+#ifndef _BITS_ERRFILE_H
+#define _BITS_ERRFILE_H
+
+/** @file
+ *
+ * LoongArch64-specific error file identifiers
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/**
+ * @addtogroup errfile Error file identifiers
+ * @{
+ */
+
+/** @} */
+
+#endif /* _BITS_ERRFILE_H */

src/arch/loong64/include/bits/hyperv.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_HYPERV_H
+#define _BITS_HYPERV_H
+
+/** @file
+ *
+ * Hyper-V interface
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_HYPERV_H */

src/arch/loong64/include/bits/io.h

@@ -0,0 +1,15 @@
+#ifndef _BITS_IO_H
+#define _BITS_IO_H
+
+/** @file
+ *
+ * LoongArch64-specific I/O API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** Page shift */
+#define PAGE_SHIFT 12
+
+#endif /* _BITS_IO_H */

src/arch/loong64/include/bits/iomap.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_IOMAP_H
+#define _BITS_IOMAP_H
+
+/** @file
+ *
+ * LoongArch64-specific I/O mapping API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_IOMAP_H */

src/arch/loong64/include/bits/nap.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_NAP_H
+#define _BITS_NAP_H
+
+/** @file
+ *
+ * LoongArch64-specific CPU sleeping API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_MAP_H */

src/arch/loong64/include/bits/pci_io.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_PCI_IO_H
+#define _BITS_PCI_IO_H
+
+/** @file
+ *
+ * LoongArch64-specific PCI I/O API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_PCI_IO_H */

src/arch/loong64/include/bits/profile.h

@@ -0,0 +1,28 @@
+#ifndef _BITS_PROFILE_H
+#define _BITS_PROFILE_H
+
+/** @file
+ *
+ * Profiling
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+
+/**
+ * Get profiling timestamp
+ *
+ * @ret timestamp	Timestamp
+ */
+static inline __attribute__ (( always_inline )) uint64_t
+profile_timestamp ( void ) {
+	uint64_t cycles;
+
+	/* Read cycle counter */
+	__asm__ __volatile__ ( "rdtime.d %0, $zero\n\t" : "=r" ( cycles ) );
+	return cycles;
+}
+
+#endif /* _BITS_PROFILE_H */

src/arch/loong64/include/bits/reboot.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_REBOOT_H
+#define _BITS_REBOOT_H
+
+/** @file
+ *
+ * LoongArch64-specific reboot API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_REBOOT_H */

src/arch/loong64/include/bits/sanboot.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_SANBOOT_H
+#define _BITS_SANBOOT_H
+
+/** @file
+ *
+ * LoongArch64-specific sanboot API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_SANBOOT_H */

src/arch/loong64/include/bits/smbios.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_SMBIOS_H
+#define _BITS_SMBIOS_H
+
+/** @file
+ *
+ * LoongArch64-specific SMBIOS API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_SMBIOS_H */

src/arch/loong64/include/bits/stdint.h

@@ -0,0 +1,23 @@
+#ifndef _BITS_STDINT_H
+#define _BITS_STDINT_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+typedef __SIZE_TYPE__		size_t;
+typedef signed long		ssize_t;
+typedef signed long		off_t;
+
+typedef unsigned char		uint8_t;
+typedef unsigned short		uint16_t;
+typedef unsigned int		uint32_t;
+typedef unsigned long long	uint64_t;
+
+typedef signed char		int8_t;
+typedef signed short		int16_t;
+typedef signed int		int32_t;
+typedef signed long long	int64_t;
+
+typedef unsigned long		physaddr_t;
+typedef unsigned long		intptr_t;
+
+#endif /* _BITS_STDINT_H */

src/arch/loong64/include/bits/string.h

@@ -0,0 +1,61 @@
+#ifndef _BITS_STRING_H
+#define _BITS_STRING_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * String functions
+ *
+ */
+
+extern void loong64_bzero ( void *dest, size_t len );
+extern void loong64_memset ( void *dest, size_t len, int character );
+extern void loong64_memcpy ( void *dest, const void *src, size_t len );
+extern void loong64_memmove_forwards ( void *dest, const void *src, size_t len );
+extern void loong64_memmove_backwards ( void *dest, const void *src, size_t len );
+extern void loong64_memmove ( void *dest, const void *src, size_t len );
+
+/**
+ * Fill memory region
+ *
+ * @v dest		Destination region
+ * @v character		Fill character
+ * @v len		Length
+ * @ret dest		Destination region
+ */
+static inline __attribute__ (( always_inline )) void *
+memset ( void *dest, int character, size_t len ) {
+	loong64_memset ( dest, len, character );
+	return dest;
+}
+
+/**
+ * Copy memory region
+ *
+ * @v dest		Destination region
+ * @v src		Source region
+ * @v len		Length
+ * @ret dest		Destination region
+ */
+static inline __attribute__ (( always_inline )) void *
+memcpy ( void *dest, const void *src, size_t len ) {
+	loong64_memcpy ( dest, src, len );
+	return dest;
+}
+
+/**
+ * Copy (possibly overlapping) memory region
+ *
+ * @v dest		Destination region
+ * @v src		Source region
+ * @v len		Length
+ * @ret dest		Destination region
+ */
+static inline __attribute__ (( always_inline )) void *
+memmove ( void *dest, const void *src, size_t len ) {
+	loong64_memmove ( dest, src, len );
+	return dest;
+}
+
+#endif /* _BITS_STRING_H */

src/arch/loong64/include/bits/strings.h

@@ -0,0 +1,69 @@
+#ifndef _BITS_STRINGS_H
+#define _BITS_STRINGS_H
+
+/** @file
+ *
+ * String functions
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/**
+ * Find first (i.e. least significant) set bit
+ *
+ * @v value		Value
+ * @ret lsb		Least significant bit set in value (LSB=1), or zero
+ */
+static inline __attribute__ (( always_inline )) int __ffsll ( long long value ){
+	unsigned long long bits = value;
+	unsigned long long lsb;
+	unsigned int lz;
+
+	/* Extract least significant set bit */
+	lsb = ( bits & -bits );
+
+	/* Count number of leading zeroes before LSB */
+	__asm__ ( "clz.d %0, %1" : "=r" ( lz ) : "r" ( lsb ) );
+
+	return ( 64 - lz );
+}
+
+/**
+ * Find first (i.e. least significant) set bit
+ *
+ * @v value		Value
+ * @ret lsb		Least significant bit set in value (LSB=1), or zero
+ */
+static inline __attribute__ (( always_inline )) int __ffsl ( long value ) {
+
+	return __ffsll ( value );
+}
+
+/**
+ * Find last (i.e. most significant) set bit
+ *
+ * @v value		Value
+ * @ret msb		Most significant bit set in value (LSB=1), or zero
+ */
+static inline __attribute__ (( always_inline )) int __flsll ( long long value ){
+	unsigned int lz;
+
+	/* Count number of leading zeroes */
+	__asm__ ( "clz.d %0, %1" : "=r" ( lz ) : "r" ( value ) );
+
+	return ( 64 - lz );
+}
+
+/**
+ * Find last (i.e. most significant) set bit
+ *
+ * @v value		Value
+ * @ret msb		Most significant bit set in value (LSB=1), or zero
+ */
+static inline __attribute__ (( always_inline )) int __flsl ( long value ) {
+
+	return __flsll ( value );
+}
+
+#endif /* _BITS_STRINGS_H */

src/arch/loong64/include/bits/tcpip.h

@@ -0,0 +1,19 @@
+#ifndef _BITS_TCPIP_H
+#define _BITS_TCPIP_H
+
+/** @file
+ *
+ * Transport-network layer interface
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+static inline __attribute__ (( always_inline )) uint16_t
+tcpip_continue_chksum ( uint16_t partial, const void *data, size_t len ) {
+
+	/* Not yet optimised */
+	return generic_tcpip_continue_chksum ( partial, data, len );
+}
+
+#endif /* _BITS_TCPIP_H */

src/arch/loong64/include/bits/time.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_TIME_H
+#define _BITS_TIME_H
+
+/** @file
+ *
+ * LoongArch64-specific time API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_TIME_H */

src/arch/loong64/include/bits/uaccess.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_UACCESS_H
+#define _BITS_UACCESS_H
+
+/** @file
+ *
+ * LoongArch64-specific user access API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_UACCESS_H */

src/arch/loong64/include/bits/uart.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_UART_H
+#define _BITS_UART_H
+
+/** @file
+ *
+ * 16550-compatible UART
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_UART_H */

src/arch/loong64/include/bits/umalloc.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_UMALLOC_H
+#define _BITS_UMALLOC_H
+
+/** @file
+ *
+ * LoongArch64-specific user memory allocation API implementations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#endif /* _BITS_UMALLOC_H */

src/arch/loong64/include/bits/xen.h

@@ -0,0 +1,13 @@
+#ifndef _BITS_XEN_H
+#define _BITS_XEN_H
+
+/** @file
+ *
+ * Xen interface
+ *
+ */
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <ipxe/nonxen.h>
+
+#endif /* _BITS_XEN_H */

src/arch/loong64/include/gdbmach.h

@@ -0,0 +1,45 @@
+#ifndef GDBMACH_H
+#define GDBMACH_H
+
+/** @file
+ *
+ * GDB architecture specifics
+ *
+ * This file declares functions for manipulating the machine state and
+ * debugging context.
+ *
+ */
+
+#include <stdint.h>
+
+typedef unsigned long gdbreg_t;
+
+/* Register snapshot */
+enum {
+	/* Not yet implemented */
+	GDBMACH_NREGS,
+};
+
+#define GDBMACH_SIZEOF_REGS ( GDBMACH_NREGS * sizeof ( gdbreg_t ) )
+
+static inline void gdbmach_set_pc ( gdbreg_t *regs, gdbreg_t pc ) {
+	/* Not yet implemented */
+	( void ) regs;
+	( void ) pc;
+}
+
+static inline void gdbmach_set_single_step ( gdbreg_t *regs, int step ) {
+	/* Not yet implemented */
+	( void ) regs;
+	( void ) step;
+}
+
+static inline void gdbmach_breakpoint ( void ) {
+	/* Not yet implemented */
+}
+
+extern int gdbmach_set_breakpoint ( int type, unsigned long addr, size_t len,
+				    int enable );
+extern void gdbmach_init ( void );
+
+#endif /* GDBMACH_H */

src/arch/loong64/include/ipxe/efi/dhcparch.h

@@ -0,0 +1,20 @@
+#ifndef _IPXE_EFI_DHCPARCH_H
+#define _IPXE_EFI_DHCPARCH_H
+
+/** @file
+ *
+ * DHCP client architecture definitions
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <ipxe/dhcp.h>
+
+/** DHCP client architecture */
+#define DHCP_ARCH_CLIENT_ARCHITECTURE DHCP_CLIENT_ARCHITECTURE_LOONG64
+
+/** DHCP client network device interface */
+#define DHCP_ARCH_CLIENT_NDI 1 /* UNDI */ , 3, 10 /* v3.10 */
+
+#endif /* _IPXE_EFI_DHCPARCH_H */

src/arch/loong64/include/limits.h

@@ -0,0 +1,53 @@
+#ifndef LIMITS_H
+#define LIMITS_H	1
+
+/* Number of bits in a `char' */
+#define CHAR_BIT	8
+
+/* Minimum and maximum values a `signed char' can hold */
+#define SCHAR_MIN	(-128)
+#define SCHAR_MAX	127
+
+/* Maximum value an `unsigned char' can hold. (Minimum is 0.) */
+#define UCHAR_MAX	255
+
+/* Minimum and maximum values a `char' can hold */
+#define CHAR_MIN	SCHAR_MIN
+#define CHAR_MAX	SCHAR_MAX
+
+/* Minimum and maximum values a `signed short int' can hold */
+#define SHRT_MIN	(-32768)
+#define SHRT_MAX	32767
+
+/* Maximum value an `unsigned short' can hold. (Minimum is 0.) */
+#define USHRT_MAX	65535
+
+/* Minimum and maximum values a `signed int' can hold */
+#define INT_MIN		(-INT_MAX - 1)
+#define INT_MAX		2147483647
+
+/* Maximum value an `unsigned int' can hold. (Minimum is 0.) */
+#define UINT_MAX	4294967295U
+
+/* Minimum and maximum values a `signed int' can hold */
+#define INT_MAX		2147483647
+#define INT_MIN		(-INT_MAX - 1)
+
+/* Maximum value an `unsigned int' can hold. (Minimum is 0.) */
+#define UINT_MAX	4294967295U
+
+/* Minimum and maximum values a `signed long' can hold */
+#define LONG_MAX	9223372036854775807L
+#define LONG_MIN	(-LONG_MAX - 1L)
+
+/* Maximum value an `unsigned long' can hold. (Minimum is 0.) */
+#define ULONG_MAX	18446744073709551615UL
+
+/* Minimum and maximum values a `signed long long' can hold */
+#define LLONG_MAX	9223372036854775807LL
+#define LLONG_MIN	(-LONG_MAX - 1LL)
+
+/* Maximum value an `unsigned long long' can hold. (Minimum is 0.) */
+#define ULLONG_MAX	18446744073709551615ULL
+
+#endif /* LIMITS_H */

src/arch/loong64/include/setjmp.h

@@ -0,0 +1,31 @@
+#ifndef _SETJMP_H
+#define _SETJMP_H
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+
+/** jump buffer env*/
+typedef struct {
+	uint64_t s0;
+	uint64_t s1;
+	uint64_t s2;
+	uint64_t s3;
+	uint64_t s4;
+	uint64_t s5;
+	uint64_t s6;
+	uint64_t s7;
+	uint64_t s8;
+
+	uint64_t fp;
+	uint64_t sp;
+	uint64_t ra;
+} jmp_buf[1];
+
+extern int __asmcall __attribute__ (( returns_twice ))
+setjmp ( jmp_buf env );
+
+extern void __asmcall __attribute__ (( noreturn ))
+longjmp ( jmp_buf env, int val );
+
+#endif /* _SETJMP_H */