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/* 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);

/*
 * The same as csum_partial, but copies from src while it checksums.
 *
 * Here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);

/*
 * this is a new version of the above that records errors it finds in *errp,
 * but continues and zeros the rest of the buffer.
 */
extern __wsum csum_partial_copy_from_user(const void __user *src,
		void *dst, int len, __wsum sum, int *errp);

/*
 *	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;

	__asm__ __volatile__ (
"	ldws,ma		4(%1), %0\n"
"	addib,<=	-4, %2, 2f\n"
"\n"
"	ldws		4(%1), %%r20\n"
"	ldws		8(%1), %%r21\n"
"	add		%0, %%r20, %0\n"
"	ldws,ma		12(%1), %%r19\n"
"	addc		%0, %%r21, %0\n"
"	addc		%0, %%r19, %0\n"
"1:	ldws,ma		4(%1), %%r19\n"
"	addib,<		0, %2, 1b\n"
"	addc		%0, %%r19, %0\n"
"\n"
"	extru		%0, 31, 16, %%r20\n"
"	extru		%0, 15, 16, %%r21\n"
"	addc		%%r20, %%r21, %0\n"
"	extru		%0, 15, 16, %%r21\n"
"	add		%0, %%r21, %0\n"
"	subi		-1, %0, %0\n"
"2:\n"
	: "=r" (sum), "=r" (iph), "=r" (ihl)
	: "1" (iph), "2" (ihl)
	: "r19", "r20", "r21", "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)
{
	__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.
	*/

"	ldd,ma		8(%1), %%r19\n"	/* get 1st saddr word */
"	ldd,ma		8(%2), %%r20\n"	/* get 1st daddr word */
"	add		%8, %3, %3\n"/* add 16-bit proto + len */
"	add		%%r19, %0, %0\n"
"	ldd,ma		8(%1), %%r21\n"	/* 2cd saddr */
"	ldd,ma		8(%2), %%r22\n"	/* 2cd daddr */
"	add,dc		%%r20, %0, %0\n"
"	add,dc		%%r21, %0, %0\n"
"	add,dc		%%r22, %0, %0\n"
"	add,dc		%3, %0, %0\n"  /* fold in proto+len | carry bit */
"	extrd,u		%0, 31, 32, %%r19\n"	/* copy upper half down */
"	depdi		0, 31, 32, %0\n"	/* clear upper half */
"	add		%%r19, %0, %0\n"	/* fold into 32-bits */
"	addc		0, %0, %0\n"		/* add 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), %%r19\n"	/* get 1st saddr word */
"	ldw,ma		4(%2), %%r20\n"	/* get 1st daddr word */
"	add		%8, %3, %3\n"	/* add 16-bit proto + len */
"	add		%%r19, %0, %0\n"
"	ldw,ma		4(%1), %%r21\n"	/* 2cd saddr */
"	addc		%%r20, %0, %0\n"
"	ldw,ma		4(%2), %%r22\n"	/* 2cd daddr */
"	addc		%%r21, %0, %0\n"
"	ldw,ma		4(%1), %%r19\n"	/* 3rd saddr */
"	addc		%%r22, %0, %0\n"
"	ldw,ma		4(%2), %%r20\n"	/* 3rd daddr */
"	addc		%%r19, %0, %0\n"
"	ldw,ma		4(%1), %%r21\n"	/* 4th saddr */
"	addc		%%r20, %0, %0\n"
"	ldw,ma		4(%2), %%r22\n"	/* 4th daddr */
"	addc		%%r21, %0, %0\n"
"	addc		%%r22, %0, %0\n"
"	addc		%3, %0, %0\n"	/* fold in proto+len, catch carry */

#endif
	: "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len)
	: "0" (sum), "1" (saddr), "2" (daddr), "3" (len), "r" (proto)
	: "r19", "r20", "r21", "r22", "memory");
	return csum_fold(sum);
}

/* 
 *	Copy and checksum to user
 */
#define HAVE_CSUM_COPY_USER
static __inline__ __wsum csum_and_copy_to_user(const void *src,
						      void __user *dst,
						      int len, __wsum sum,
						      int *err_ptr)
{
	/* code stolen from include/asm-mips64 */
	sum = csum_partial(src, len, sum);
	 
	if (copy_to_user(dst, src, len)) {
		*err_ptr = -EFAULT;
		return (__force __wsum)-1;
	}

	return sum;
}

#endif


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Name Type Size Permission Actions
Kbuild File 610 B 0644
agp.h File 596 B 0644
asm-offsets.h File 35 B 0644
asmregs.h File 3.04 KB 0644
assembly.h File 12.94 KB 0644
atomic.h File 8.24 KB 0644
barrier.h File 2.44 KB 0644
bitops.h File 5.89 KB 0644
bug.h File 2.35 KB 0644
bugs.h File 340 B 0644
cache.h File 1.59 KB 0644
cacheflush.h File 4.06 KB 0644
checksum.h File 5.48 KB 0644
cmpxchg.h File 3.62 KB 0644
compat.h File 6.52 KB 0644
compat_ucontext.h File 591 B 0644
delay.h File 533 B 0644
dma-mapping.h File 2.42 KB 0644
dma.h File 5.71 KB 0644
dwarf.h File 602 B 0644
eisa_bus.h File 702 B 0644
eisa_eeprom.h File 4.42 KB 0644
elf.h File 14.31 KB 0644
fb.h File 403 B 0644
fixmap.h File 1.15 KB 0644
floppy.h File 6.61 KB 0644
ftrace.h File 379 B 0644
futex.h File 2.66 KB 0644
grfioctl.h File 4.68 KB 0644
hardirq.h File 1.3 KB 0644
hardware.h File 4.09 KB 0644
hash.h File 5.07 KB 0644
hugetlb.h File 1.67 KB 0644
ide.h File 1.09 KB 0644
io.h File 8.14 KB 0644
irq.h File 1.23 KB 0644
irqflags.h File 1.02 KB 0644
kbdleds.h File 477 B 0644
kmap_types.h File 221 B 0644
ldcw.h File 2.15 KB 0644
led.h File 1.33 KB 0644
linkage.h File 759 B 0644
machdep.h File 349 B 0644
mckinley.h File 270 B 0644
mmu.h File 195 B 0644
mmu_context.h File 2.08 KB 0644
mmzone.h File 1.51 KB 0644
module.h File 527 B 0644
page.h File 5.42 KB 0644
parisc-device.h File 1.92 KB 0644
parport.h File 358 B 0644
pci.h File 6.57 KB 0644
pdc.h File 3.93 KB 0644
pdc_chassis.h File 15.06 KB 0644
pdcpat.h File 15 KB 0644
perf.h File 1.89 KB 0644
perf_event.h File 152 B 0644
pgalloc.h File 4.22 KB 0644
pgtable.h File 18.92 KB 0644
prefetch.h File 1.12 KB 0644
processor.h File 9.86 KB 0644
psw.h File 2.39 KB 0644
ptrace.h File 803 B 0644
ropes.h File 9.73 KB 0644
rt_sigframe.h File 745 B 0644
runway.h File 320 B 0644
sections.h File 283 B 0644
serial.h File 124 B 0644
shmparam.h File 263 B 0644
signal.h File 841 B 0644
smp.h File 1.25 KB 0644
socket.h File 311 B 0644
special_insns.h File 1015 B 0644
spinlock.h File 4.02 KB 0644
spinlock_types.h File 483 B 0644
string.h File 247 B 0644
superio.h File 3.25 KB 0644
switch_to.h File 332 B 0644
syscall.h File 1.4 KB 0644
termios.h File 1.72 KB 0644
thread_info.h File 3.15 KB 0644
timex.h File 372 B 0644
tlb.h File 672 B 0644
tlbflush.h File 2.63 KB 0644
topology.h File 900 B 0644
traps.h File 468 B 0644
uaccess.h File 6.55 KB 0644
ucontext.h File 327 B 0644
unaligned.h File 472 B 0644
unistd.h File 5.47 KB 0644
unwind.h File 2.56 KB 0644