Warning: This file is not a C or C++ file. It does not have highlighting.
| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _PARISC_CHECKSUM_H |
| 3 | #define _PARISC_CHECKSUM_H |
| 4 | |
| 5 | #include <linux/in6.h> |
| 6 | |
| 7 | /* |
| 8 | * computes the checksum of a memory block at buff, length len, |
| 9 | * and adds in "sum" (32-bit) |
| 10 | * |
| 11 | * returns a 32-bit number suitable for feeding into itself |
| 12 | * or csum_tcpudp_magic |
| 13 | * |
| 14 | * this function must be called with even lengths, except |
| 15 | * for the last fragment, which may be odd |
| 16 | * |
| 17 | * it's best to have buff aligned on a 32-bit boundary |
| 18 | */ |
| 19 | extern __wsum csum_partial(const void *, int, __wsum); |
| 20 | |
| 21 | /* |
| 22 | * Optimized for IP headers, which always checksum on 4 octet boundaries. |
| 23 | * |
| 24 | * Written by Randolph Chung <tausq@debian.org>, and then mucked with by |
| 25 | * LaMont Jones <lamont@debian.org> |
| 26 | */ |
| 27 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
| 28 | { |
| 29 | unsigned int sum; |
| 30 | unsigned long t0, t1, t2; |
| 31 | |
| 32 | __asm__ __volatile__ ( |
| 33 | " ldws,ma 4(%1), %0\n" |
| 34 | " addib,<= -4, %2, 2f\n" |
| 35 | "\n" |
| 36 | " ldws 4(%1), %4\n" |
| 37 | " ldws 8(%1), %5\n" |
| 38 | " add %0, %4, %0\n" |
| 39 | " ldws,ma 12(%1), %3\n" |
| 40 | " addc %0, %5, %0\n" |
| 41 | " addc %0, %3, %0\n" |
| 42 | "1: ldws,ma 4(%1), %3\n" |
| 43 | " addib,> -1, %2, 1b\n" |
| 44 | " addc %0, %3, %0\n" |
| 45 | "\n" |
| 46 | " extru %0, 31, 16, %4\n" |
| 47 | " extru %0, 15, 16, %5\n" |
| 48 | " addc %4, %5, %0\n" |
| 49 | " extru %0, 15, 16, %5\n" |
| 50 | " add %0, %5, %0\n" |
| 51 | " subi -1, %0, %0\n" |
| 52 | "2:\n" |
| 53 | : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (t0), "=r" (t1), "=r" (t2) |
| 54 | : "1" (iph), "2" (ihl) |
| 55 | : "memory"); |
| 56 | |
| 57 | return (__force __sum16)sum; |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * Fold a partial checksum |
| 62 | */ |
| 63 | static inline __sum16 csum_fold(__wsum csum) |
| 64 | { |
| 65 | u32 sum = (__force u32)csum; |
| 66 | /* add the swapped two 16-bit halves of sum, |
| 67 | a possible carry from adding the two 16-bit halves, |
| 68 | will carry from the lower half into the upper half, |
| 69 | giving us the correct sum in the upper half. */ |
| 70 | sum += (sum << 16) + (sum >> 16); |
| 71 | return (__force __sum16)(~sum >> 16); |
| 72 | } |
| 73 | |
| 74 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| 75 | __u32 len, __u8 proto, |
| 76 | __wsum sum) |
| 77 | { |
| 78 | __asm__( |
| 79 | " add %1, %0, %0\n" |
| 80 | " addc %2, %0, %0\n" |
| 81 | " addc %3, %0, %0\n" |
| 82 | " addc %%r0, %0, %0\n" |
| 83 | : "=r" (sum) |
| 84 | : "r" (daddr), "r"(saddr), "r"(proto+len), "0"(sum)); |
| 85 | return sum; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * computes the checksum of the TCP/UDP pseudo-header |
| 90 | * returns a 16-bit checksum, already complemented |
| 91 | */ |
| 92 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| 93 | __u32 len, __u8 proto, |
| 94 | __wsum sum) |
| 95 | { |
| 96 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * this routine is used for miscellaneous IP-like checksums, mainly |
| 101 | * in icmp.c |
| 102 | */ |
| 103 | static inline __sum16 ip_compute_csum(const void *buf, int len) |
| 104 | { |
| 105 | return csum_fold (csum_partial(buf, len, 0)); |
| 106 | } |
| 107 | |
| 108 | |
| 109 | #define _HAVE_ARCH_IPV6_CSUM |
| 110 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 111 | const struct in6_addr *daddr, |
| 112 | __u32 len, __u8 proto, |
| 113 | __wsum sum) |
| 114 | { |
| 115 | unsigned long t0, t1, t2, t3; |
| 116 | |
| 117 | len += proto; /* add 16-bit proto + len */ |
| 118 | |
| 119 | __asm__ __volatile__ ( |
| 120 | |
| 121 | #if BITS_PER_LONG > 32 |
| 122 | |
| 123 | /* |
| 124 | ** We can execute two loads and two adds per cycle on PA 8000. |
| 125 | ** But add insn's get serialized waiting for the carry bit. |
| 126 | ** Try to keep 4 registers with "live" values ahead of the ALU. |
| 127 | */ |
| 128 | |
| 129 | " depdi 0, 31, 32, %0\n"/* clear upper half of incoming checksum */ |
| 130 | " ldd,ma 8(%1), %4\n" /* get 1st saddr word */ |
| 131 | " ldd,ma 8(%2), %5\n" /* get 1st daddr word */ |
| 132 | " add %4, %0, %0\n" |
| 133 | " ldd,ma 8(%1), %6\n" /* 2nd saddr */ |
| 134 | " ldd,ma 8(%2), %7\n" /* 2nd daddr */ |
| 135 | " add,dc %5, %0, %0\n" |
| 136 | " add,dc %6, %0, %0\n" |
| 137 | " add,dc %7, %0, %0\n" |
| 138 | " add,dc %3, %0, %0\n" /* fold in proto+len | carry bit */ |
| 139 | " extrd,u %0, 31, 32, %4\n"/* copy upper half down */ |
| 140 | " depdi 0, 31, 32, %0\n"/* clear upper half */ |
| 141 | " add,dc %4, %0, %0\n" /* fold into 32-bits, plus carry */ |
| 142 | " addc 0, %0, %0\n" /* add final carry */ |
| 143 | |
| 144 | #else |
| 145 | |
| 146 | /* |
| 147 | ** For PA 1.x, the insn order doesn't matter as much. |
| 148 | ** Insn stream is serialized on the carry bit here too. |
| 149 | ** result from the previous operation (eg r0 + x) |
| 150 | */ |
| 151 | " ldw,ma 4(%1), %4\n" /* get 1st saddr word */ |
| 152 | " ldw,ma 4(%2), %5\n" /* get 1st daddr word */ |
| 153 | " add %4, %0, %0\n" |
| 154 | " ldw,ma 4(%1), %6\n" /* 2nd saddr */ |
| 155 | " addc %5, %0, %0\n" |
| 156 | " ldw,ma 4(%2), %7\n" /* 2nd daddr */ |
| 157 | " addc %6, %0, %0\n" |
| 158 | " ldw,ma 4(%1), %4\n" /* 3rd saddr */ |
| 159 | " addc %7, %0, %0\n" |
| 160 | " ldw,ma 4(%2), %5\n" /* 3rd daddr */ |
| 161 | " addc %4, %0, %0\n" |
| 162 | " ldw,ma 4(%1), %6\n" /* 4th saddr */ |
| 163 | " addc %5, %0, %0\n" |
| 164 | " ldw,ma 4(%2), %7\n" /* 4th daddr */ |
| 165 | " addc %6, %0, %0\n" |
| 166 | " addc %7, %0, %0\n" |
| 167 | " addc %3, %0, %0\n" /* fold in proto+len */ |
| 168 | " addc 0, %0, %0\n" /* add carry */ |
| 169 | |
| 170 | #endif |
| 171 | : "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len), |
| 172 | "=r" (t0), "=r" (t1), "=r" (t2), "=r" (t3) |
| 173 | : "0" (sum), "1" (saddr), "2" (daddr), "3" (len) |
| 174 | : "memory"); |
| 175 | return csum_fold(sum); |
| 176 | } |
| 177 | |
| 178 | #endif |
| 179 | |
| 180 |
Warning: This file is not a C or C++ file. It does not have highlighting.