/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle * Copyright (C) 1999 Silicon Graphics, Inc. * Copyright (C) 2001 Thiemo Seufer. * Copyright (C) 2002 Maciej W. Rozycki * Copyright (C) 2014 Imagination Technologies Ltd. */ #ifndef _ASM_CHECKSUM_H #define _ASM_CHECKSUM_H #ifdef CONFIG_GENERIC_CSUM #include #else #include #include /* * 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 */ __wsum csum_partial(const void *buff, int len, __wsum sum); __wsum __csum_partial_copy_kernel(const void *src, void *dst, int len, __wsum sum, int *err_ptr); __wsum __csum_partial_copy_from_user(const void *src, void *dst, int len, __wsum sum, int *err_ptr); __wsum __csum_partial_copy_to_user(const void *src, void *dst, int len, __wsum sum, int *err_ptr); /* * this is a new version of the above that records errors it finds in *errp, * but continues and zeros the rest of the buffer. */ static inline __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { might_fault(); if (segment_eq(get_fs(), get_ds())) return __csum_partial_copy_kernel((__force void *)src, dst, len, sum, err_ptr); else return __csum_partial_copy_from_user((__force void *)src, dst, len, sum, err_ptr); } #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER static inline __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { if (access_ok(VERIFY_READ, src, len)) return csum_partial_copy_from_user(src, dst, len, sum, err_ptr); if (len) *err_ptr = -EFAULT; return 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) { might_fault(); if (access_ok(VERIFY_WRITE, dst, len)) { if (segment_eq(get_fs(), get_ds())) return __csum_partial_copy_kernel(src, (__force void *)dst, len, sum, err_ptr); else return __csum_partial_copy_to_user(src, (__force void *)dst, len, sum, err_ptr); } if (len) *err_ptr = -EFAULT; return (__force __wsum)-1; /* invalid checksum */ } /* * the same as csum_partial, but copies from user space (but on MIPS * we have just one address space, so this is identical to the above) */ __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); #define csum_partial_copy_nocheck csum_partial_copy_nocheck /* * Fold a partial checksum without adding pseudo headers */ static inline __sum16 csum_fold(__wsum csum) { u32 sum = (__force u32)csum;; sum += (sum << 16); csum = (sum < csum); sum >>= 16; sum += csum; return (__force __sum16)~sum; } #define csum_fold csum_fold /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. * * By Jorge Cwik , adapted for linux by * Arnt Gulbrandsen. */ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { const unsigned int *word = iph; const unsigned int *stop = word + ihl; unsigned int csum; int carry; csum = word[0]; csum += word[1]; carry = (csum < word[1]); csum += carry; csum += word[2]; carry = (csum < word[2]); csum += carry; csum += word[3]; carry = (csum < word[3]); csum += carry; word += 4; do { csum += *word; carry = (csum < *word); csum += carry; word++; } while (word != stop); return csum_fold(csum); } #define ip_fast_csum ip_fast_csum static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { __asm__( " .set push # csum_tcpudp_nofold\n" " .set noat \n" #ifdef CONFIG_32BIT " addu %0, %2 \n" " sltu $1, %0, %2 \n" " addu %0, $1 \n" " addu %0, %3 \n" " sltu $1, %0, %3 \n" " addu %0, $1 \n" " addu %0, %4 \n" " sltu $1, %0, %4 \n" " addu %0, $1 \n" #endif #ifdef CONFIG_64BIT " daddu %0, %2 \n" " daddu %0, %3 \n" " daddu %0, %4 \n" " dsll32 $1, %0, 0 \n" " daddu %0, $1 \n" " dsra32 %0, %0, 0 \n" #endif " .set pop" : "=r" (sum) : "0" ((__force unsigned long)daddr), "r" ((__force unsigned long)saddr), #ifdef __MIPSEL__ "r" ((proto + len) << 8), #else "r" (proto + len), #endif "r" ((__force unsigned long)sum)); return sum; } #define csum_tcpudp_nofold csum_tcpudp_nofold /* * this routine is used for miscellaneous IP-like checksums, mainly * in icmp.c */ static inline __sum16 ip_compute_csum(const void *buff, int len) { return csum_fold(csum_partial(buff, 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) { __wsum tmp; __asm__( " .set push # csum_ipv6_magic\n" " .set noreorder \n" " .set noat \n" " addu %0, %5 # proto (long in network byte order)\n" " sltu $1, %0, %5 \n" " addu %0, $1 \n" " addu %0, %6 # csum\n" " sltu $1, %0, %6 \n" " lw %1, 0(%2) # four words source address\n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 4(%2) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 8(%2) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 12(%2) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 0(%3) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 4(%3) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 8(%3) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " lw %1, 12(%3) \n" " addu %0, $1 \n" " addu %0, %1 \n" " sltu $1, %0, %1 \n" " addu %0, $1 # Add final carry\n" " .set pop" : "=&r" (sum), "=&r" (tmp) : "r" (saddr), "r" (daddr), "0" (htonl(len)), "r" (htonl(proto)), "r" (sum)); return csum_fold(sum); } #include #endif /* CONFIG_GENERIC_CSUM */ #endif /* _ASM_CHECKSUM_H */ reverts commit 27b9d5a254dcbc6095404c1bab7c335419601eb8. I am reverting this one, while keeping the rest of the G920 support in, so that it immediately starts working once proper HID-mode switching is implemented. Quoting Dmitry Torokhov for rationale: == It is wrong. Aside form the fact that IMO xpad.c is the wrong place for this code to be in, why are we waiting for the input device to be opened by userspace before we do the switch instead of doing it immediately? == Several people (Simon Wood and Michal Maly) expressed the intent to work on proper HID switching in a short term. Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/men-chameleon-bus.txt')