/* * include/asm-xtensa/checksum.h * * 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) 2001 - 2005 Tensilica Inc. */ #ifndef _XTENSA_CHECKSUM_H #define _XTENSA_CHECKSUM_H #include <linux/in6.h> #include <linux/uaccess.h> #include <variant/core.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 */ asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); /* * the same as csum_partial, but copies from src while it * checksums, and handles user-space pointer exceptions correctly, when needed. * * here even more important to align src and dst on a 32-bit (or even * better 64-bit) boundary */ asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, int len, __wsum sum, int *src_err_ptr, int *dst_err_ptr); /* * Note: when you get a NULL pointer exception here this means someone * passed in an incorrect kernel address to one of these functions. * * If you use these functions directly please don't forget the access_ok(). */ static inline __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) { return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL); } static inline __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { return csum_partial_copy_generic((__force const void *)src, dst, len, sum, err_ptr, NULL); } /* * Fold a partial checksum */ static __inline__ __sum16 csum_fold(__wsum sum) { unsigned int __dummy; __asm__("extui %1, %0, 16, 16\n\t" "extui %0 ,%0, 0, 16\n\t" "add %0, %0, %1\n\t" "slli %1, %0, 16\n\t" "add %0, %0, %1\n\t" "extui %0, %0, 16, 16\n\t" "neg %0, %0\n\t" "addi %0, %0, -1\n\t" "extui %0, %0, 0, 16\n\t" : "=r" (sum), "=&r" (__dummy) : "0" (sum)); return (__force __sum16)sum; } /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. */ static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { unsigned int sum, tmp, endaddr; __asm__ __volatile__( "sub %0, %0, %0\n\t" #if XCHAL_HAVE_LOOPS "loopgtz %2, 2f\n\t" #else "beqz %2, 2f\n\t" "slli %4, %2, 2\n\t" "add %4, %4, %1\n\t" "0:\t" #endif "l32i %3, %1, 0\n\t" "add %0, %0, %3\n\t" "bgeu %0, %3, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "addi %1, %1, 4\n\t" #if !XCHAL_HAVE_LOOPS "blt %1, %4, 0b\n\t" #endif "2:\t" /* Since the input registers which are loaded with iph and ihl are modified, we must also specify them as outputs, or gcc will assume they contain their original values. */ : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), "=&r" (endaddr) : "1" (iph), "2" (ihl) : "memory"); return csum_fold(sum); } static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { #ifdef __XTENSA_EL__ unsigned long len_proto = (len + proto) << 8; #elif defined(__XTENSA_EB__) unsigned long len_proto = len + proto; #else # error processor byte order undefined! #endif __asm__("add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "add %0, %0, %2\n\t" "bgeu %0, %2, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "add %0, %0, %3\n\t" "bgeu %0, %3, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" : "=r" (sum), "=r" (len_proto) : "r" (daddr), "r" (saddr), "1" (len_proto), "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 *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) { unsigned int __dummy; __asm__("l32i %1, %2, 0\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %2, 4\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %2, 8\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %2, 12\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %3, 0\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %3, 4\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %3, 8\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "l32i %1, %3, 12\n\t" "add %0, %0, %1\n\t" "bgeu %0, %1, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "add %0, %0, %4\n\t" "bgeu %0, %4, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" "add %0, %0, %5\n\t" "bgeu %0, %5, 1f\n\t" "addi %0, %0, 1\n\t" "1:\t" : "=r" (sum), "=&r" (__dummy) : "r" (saddr), "r" (daddr), "r" (htonl(len)), "r" (htonl(proto)), "0" (sum) : "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) { if (access_ok(VERIFY_WRITE, dst, len)) return csum_partial_copy_generic(src,dst,len,sum,NULL,err_ptr); if (len) *err_ptr = -EFAULT; return (__force __wsum)-1; /* invalid checksum */ } #endif
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
Kbuild | File | 685 B | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
asm-uaccess.h | File | 4.11 KB | 0644 |
|
asmmacro.h | File | 2.76 KB | 0644 |
|
atomic.h | File | 7.38 KB | 0644 |
|
barrier.h | File | 542 B | 0644 |
|
bitops.h | File | 5.08 KB | 0644 |
|
bootparam.h | File | 1.37 KB | 0644 |
|
bugs.h | File | 451 B | 0644 |
|
cache.h | File | 969 B | 0644 |
|
cacheasm.h | File | 3.77 KB | 0644 |
|
cacheflush.h | File | 5.76 KB | 0644 |
|
checksum.h | File | 6 KB | 0644 |
|
cmpxchg.h | File | 3.9 KB | 0644 |
|
coprocessor.h | File | 5.05 KB | 0644 |
|
current.h | File | 675 B | 0644 |
|
delay.h | File | 1.63 KB | 0644 |
|
dma-mapping.h | File | 855 B | 0644 |
|
dma.h | File | 1.79 KB | 0644 |
|
elf.h | File | 5.75 KB | 0644 |
|
fixmap.h | File | 2.5 KB | 0644 |
|
flat.h | File | 686 B | 0644 |
|
ftrace.h | File | 979 B | 0644 |
|
futex.h | File | 2.59 KB | 0644 |
|
highmem.h | File | 2.33 KB | 0644 |
|
hw_breakpoint.h | File | 1.45 KB | 0644 |
|
hw_irq.h | File | 320 B | 0644 |
|
initialize_mmu.h | File | 4.58 KB | 0644 |
|
io.h | File | 2.09 KB | 0644 |
|
irq.h | File | 1.46 KB | 0644 |
|
irqflags.h | File | 1.99 KB | 0644 |
|
kmem_layout.h | File | 2.07 KB | 0644 |
|
mmu.h | File | 462 B | 0644 |
|
mmu_context.h | File | 3.62 KB | 0644 |
|
module.h | File | 525 B | 0644 |
|
mxregs.h | File | 1.3 KB | 0644 |
|
nommu_context.h | File | 602 B | 0644 |
|
page.h | File | 5.69 KB | 0644 |
|
pci-bridge.h | File | 2.16 KB | 0644 |
|
pci.h | File | 1.37 KB | 0644 |
|
perf_event.h | File | 108 B | 0644 |
|
pgalloc.h | File | 1.84 KB | 0644 |
|
pgtable.h | File | 14.89 KB | 0644 |
|
platform.h | File | 1.75 KB | 0644 |
|
processor.h | File | 7.44 KB | 0644 |
|
ptrace.h | File | 3.74 KB | 0644 |
|
regs.h | File | 3.87 KB | 0644 |
|
segment.h | File | 376 B | 0644 |
|
serial.h | File | 443 B | 0644 |
|
shmparam.h | File | 561 B | 0644 |
|
signal.h | File | 502 B | 0644 |
|
smp.h | File | 967 B | 0644 |
|
spinlock.h | File | 4.6 KB | 0644 |
|
spinlock_types.h | File | 412 B | 0644 |
|
stacktrace.h | File | 1.13 KB | 0644 |
|
string.h | File | 2.65 KB | 0644 |
|
switch_to.h | File | 601 B | 0644 |
|
syscall.h | File | 982 B | 0644 |
|
sysmem.h | File | 426 B | 0644 |
|
thread_info.h | File | 3.62 KB | 0644 |
|
timex.h | File | 1.79 KB | 0644 |
|
tlb.h | File | 1.1 KB | 0644 |
|
tlbflush.h | File | 5.53 KB | 0644 |
|
traps.h | File | 1.87 KB | 0644 |
|
types.h | File | 501 B | 0644 |
|
uaccess.h | File | 8.67 KB | 0644 |
|
ucontext.h | File | 540 B | 0644 |
|
unaligned.h | File | 864 B | 0644 |
|
unistd.h | File | 639 B | 0644 |
|
user.h | File | 507 B | 0644 |
|
vectors.h | File | 4.05 KB | 0644 |
|
vga.h | File | 434 B | 0644 |
|