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/usr/src/linux-headers-5.15.0-181/arch/parisc/include/asm/

/usr/src/linux-headers-5.15.0-181/arch/parisc/include/asm

Name	Size	Mode	Actions
agp.h	596	0644	edit dl rm
alternative.h	1954	0644	edit dl rm
asm-offsets.h	35	0644	edit dl rm
asmregs.h	2478	0644	edit dl rm
assembly.h	12496	0644	edit dl rm
atomic.h	5718	0644	edit dl rm
barrier.h	2563	0644	edit dl rm
bitops.h	5578	0644	edit dl rm
bug.h	2408	0644	edit dl rm
cache.h	2084	0644	edit dl rm
cacheflush.h	3773	0644	edit dl rm
checksum.h	4715	0644	edit dl rm
cmpxchg.h	3783	0644	edit dl rm
compat.h	3973	0644	edit dl rm
compat_ucontext.h	591	0644	edit dl rm
delay.h	533	0644	edit dl rm
dma-mapping.h	1012	0644	edit dl rm
dma.h	5849	0644	edit dl rm
dwarf.h	456	0644	edit dl rm
eisa_bus.h	492	0644	edit dl rm
eisa_eeprom.h	4318	0644	edit dl rm
elf.h	14381	0644	edit dl rm
fb.h	491	0644	edit dl rm
fixmap.h	1611	0644	edit dl rm
floppy.h	6193	0644	edit dl rm
ftrace.h	641	0644	edit dl rm
futex.h	2666	0644	edit dl rm
grfioctl.h	4090	0644	edit dl rm
hardirq.h	976	0644	edit dl rm
hardware.h	4239	0644	edit dl rm
hash.h	5194	0644	edit dl rm
hugetlb.h	1331	0644	edit dl rm
ide.h	1120	0644	edit dl rm
io.h	8307	0644	edit dl rm
irq.h	1171	0644	edit dl rm
irqflags.h	1046	0644	edit dl rm
jump_label.h	990	0644	edit dl rm
kbdleds.h	477	0644	edit dl rm
Kbuild	175	0644	edit dl rm
kexec.h	827	0644	edit dl rm
kgdb.h	1318	0644	edit dl rm
kprobes.h	1284	0644	edit dl rm
ldcw.h	2570	0644	edit dl rm
led.h	1362	0644	edit dl rm
linkage.h	738	0644	edit dl rm
machdep.h	349	0644	edit dl rm
mckinley.h	270	0644	edit dl rm
mmu.h	195	0644	edit dl rm
mmu_context.h	2355	0644	edit dl rm
mmzone.h	202	0644	edit dl rm
module.h	527	0644	edit dl rm
page.h	5533	0644	edit dl rm
parisc-device.h	1964	0644	edit dl rm
parport.h	358	0644	edit dl rm
patch.h	445	0644	edit dl rm
pci.h	5956	0644	edit dl rm
pdc.h	4269	0644	edit dl rm
pdcpat.h	16968	0644	edit dl rm
pdc_chassis.h	14745	0644	edit dl rm
perf.h	1936	0644	edit dl rm
perf_event.h	152	0644	edit dl rm
pgalloc.h	1722	0644	edit dl rm
pgtable.h	17034	0644	edit dl rm
prefetch.h	1147	0644	edit dl rm
processor.h	9486	0644	edit dl rm
psw.h	2464	0644	edit dl rm
ptrace.h	1603	0644	edit dl rm
ropes.h	10060	0644	edit dl rm
rt_sigframe.h	745	0644	edit dl rm
runway.h	320	0644	edit dl rm
seccomp.h	651	0644	edit dl rm
sections.h	494	0644	edit dl rm
serial.h	124	0644	edit dl rm
shmparam.h	263	0644	edit dl rm
signal.h	685	0644	edit dl rm
smp.h	1276	0644	edit dl rm
socket.h	310	0644	edit dl rm
sparsemem.h	345	0644	edit dl rm
special_insns.h	1554	0644	edit dl rm
spinlock.h	3182	0644	edit dl rm
spinlock_types.h	701	0644	edit dl rm
string.h	247	0644	edit dl rm
superio.h	3333	0644	edit dl rm
switch_to.h	332	0644	edit dl rm
syscall.h	1477	0644	edit dl rm
termios.h	1761	0644	edit dl rm
thread_info.h	3143	0644	edit dl rm
timex.h	403	0644	edit dl rm
tlb.h	288	0644	edit dl rm
tlbflush.h	1975	0644	edit dl rm
topology.h	900	0644	edit dl rm
traps.h	598	0644	edit dl rm
uaccess.h	6253	0644	edit dl rm
ucontext.h	327	0644	edit dl rm
unaligned.h	307	0644	edit dl rm
unistd.h	5776	0644	edit dl rm
unwind.h	2723	0644	edit dl rm
vmalloc.h	96	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/parisc/include/asm/checksum.h (4715B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PARISC_CHECKSUM_H
#define _PARISC_CHECKSUM_H

#include <linux/in6.h>

/*
 * computes the checksum of a memory block at buff, length len,
 * and adds in "sum" (32-bit)
 *
 * returns a 32-bit number suitable for feeding into itself
 * or csum_tcpudp_magic
 *
 * this function must be called with even lengths, except
 * for the last fragment, which may be odd
 *
 * it's best to have buff aligned on a 32-bit boundary
 */
extern __wsum csum_partial(const void *, int, __wsum);

/*
 *	Optimized for IP headers, which always checksum on 4 octet boundaries.
 *
 *	Written by Randolph Chung <tausq@debian.org>, and then mucked with by
 *	LaMont Jones <lamont@debian.org>
 */
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
	unsigned int sum;
	unsigned long t0, t1, t2;

__asm__ __volatile__ (
"	ldws,ma		4(%1), %0\n"
"	addib,<=	-4, %2, 2f\n"
"\n"
"	ldws		4(%1), %4\n"
"	ldws		8(%1), %5\n"
"	add		%0, %4, %0\n"
"	ldws,ma		12(%1), %3\n"
"	addc		%0, %5, %0\n"
"	addc		%0, %3, %0\n"
"1:	ldws,ma		4(%1), %3\n"
"	addib,>		-1, %2, 1b\n"
"	addc		%0, %3, %0\n"
"\n"
"	extru		%0, 31, 16, %4\n"
"	extru		%0, 15, 16, %5\n"
"	addc		%4, %5, %0\n"
"	extru		%0, 15, 16, %5\n"
"	add		%0, %5, %0\n"
"	subi		-1, %0, %0\n"
"2:\n"
	: "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (t0), "=r" (t1), "=r" (t2)
	: "1" (iph), "2" (ihl)
	: "memory");

return (__force __sum16)sum;
}

/*
 *	Fold a partial checksum
 */
static inline __sum16 csum_fold(__wsum csum)
{
	u32 sum = (__force u32)csum;
	/* add the swapped two 16-bit halves of sum,
	   a possible carry from adding the two 16-bit halves,
	   will carry from the lower half into the upper half,
	   giving us the correct sum in the upper half. */
	sum += (sum << 16) + (sum >> 16);
	return (__force __sum16)(~sum >> 16);
}
 
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
					__u32 len, __u8 proto,
					__wsum sum)
{
	__asm__(
	"	add  %1, %0, %0\n"
	"	addc %2, %0, %0\n"
	"	addc %3, %0, %0\n"
	"	addc %%r0, %0, %0\n"
		: "=r" (sum)
		: "r" (daddr), "r"(saddr), "r"(proto+len), "0"(sum));
	return sum;
}

/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
					__u32 len, __u8 proto,
					__wsum sum)
{
	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}

/*
 * this routine is used for miscellaneous IP-like checksums, mainly
 * in icmp.c
 */
static inline __sum16 ip_compute_csum(const void *buf, int len)
{
	 return csum_fold (csum_partial(buf, len, 0));
}

#define _HAVE_ARCH_IPV6_CSUM
static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
					  const struct in6_addr *daddr,
					  __u32 len, __u8 proto,
					  __wsum sum)
{
	unsigned long t0, t1, t2, t3;

len += proto;	/* add 16-bit proto + len */

__asm__ __volatile__ (

#if BITS_PER_LONG > 32

/*
	** We can execute two loads and two adds per cycle on PA 8000.
	** But add insn's get serialized waiting for the carry bit.
	** Try to keep 4 registers with "live" values ahead of the ALU.
	*/

"	depdi		0, 31, 32, %0\n"/* clear upper half of incoming checksum */
"	ldd,ma		8(%1), %4\n"	/* get 1st saddr word */
"	ldd,ma		8(%2), %5\n"	/* get 1st daddr word */
"	add		%4, %0, %0\n"
"	ldd,ma		8(%1), %6\n"	/* 2nd saddr */
"	ldd,ma		8(%2), %7\n"	/* 2nd daddr */
"	add,dc		%5, %0, %0\n"
"	add,dc		%6, %0, %0\n"
"	add,dc		%7, %0, %0\n"
"	add,dc		%3, %0, %0\n"  /* fold in proto+len | carry bit */
"	extrd,u		%0, 31, 32, %4\n"/* copy upper half down */
"	depdi		0, 31, 32, %0\n"/* clear upper half */
"	add,dc		%4, %0, %0\n"	/* fold into 32-bits, plus carry */
"	addc		0, %0, %0\n"	/* add final carry */

#else

/*
	** For PA 1.x, the insn order doesn't matter as much.
	** Insn stream is serialized on the carry bit here too.
	** result from the previous operation (eg r0 + x)
	*/
"	ldw,ma		4(%1), %4\n"	/* get 1st saddr word */
"	ldw,ma		4(%2), %5\n"	/* get 1st daddr word */
"	add		%4, %0, %0\n"
"	ldw,ma		4(%1), %6\n"	/* 2nd saddr */
"	addc		%5, %0, %0\n"
"	ldw,ma		4(%2), %7\n"	/* 2nd daddr */
"	addc		%6, %0, %0\n"
"	ldw,ma		4(%1), %4\n"	/* 3rd saddr */
"	addc		%7, %0, %0\n"
"	ldw,ma		4(%2), %5\n"	/* 3rd daddr */
"	addc		%4, %0, %0\n"
"	ldw,ma		4(%1), %6\n"	/* 4th saddr */
"	addc		%5, %0, %0\n"
"	ldw,ma		4(%2), %7\n"	/* 4th daddr */
"	addc		%6, %0, %0\n"
"	addc		%7, %0, %0\n"
"	addc		%3, %0, %0\n"	/* fold in proto+len */
"	addc		0, %0, %0\n"	/* add carry */

#endif
	: "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len),
	  "=r" (t0), "=r" (t1), "=r" (t2), "=r" (t3)
	: "0" (sum), "1" (saddr), "2" (daddr), "3" (len)
	: "memory");
	return csum_fold(sum);
}

#endif

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