diff options
Diffstat (limited to 'src/mem/packet.cc')
| -rw-r--r-- | src/mem/packet.cc | 109 |
1 files changed, 42 insertions, 67 deletions
diff --git a/src/mem/packet.cc b/src/mem/packet.cc index 09b612ad0..ecc2feb26 100644 --- a/src/mem/packet.cc +++ b/src/mem/packet.cc @@ -1,5 +1,5 @@ /* - * Copyright (c) 2011-2014 ARM Limited + * Copyright (c) 2011-2015 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -207,6 +207,8 @@ Packet::checkFunctional(Printable *obj, Addr addr, bool is_secure, int size, if (isRead()) { if (func_start >= val_start && func_end <= val_end) { memcpy(getPtr<uint8_t>(), _data + offset, getSize()); + if (bytesValid.empty()) + bytesValid.resize(getSize(), true); // complete overlap, and as the current packet is a read // we are done return true; @@ -218,91 +220,64 @@ Packet::checkFunctional(Printable *obj, Addr addr, bool is_secure, int size, // calculate offsets and copy sizes for the two byte arrays if (val_start < func_start && val_end <= func_end) { + // the one we are checking against starts before and + // ends before or the same val_offset = func_start - val_start; func_offset = 0; overlap_size = val_end - func_start; } else if (val_start >= func_start && val_end > func_end) { + // the one we are checking against starts after or the + // same, and ends after val_offset = 0; func_offset = val_start - func_start; overlap_size = func_end - val_start; } else if (val_start >= func_start && val_end <= func_end) { + // the one we are checking against is completely + // subsumed in the current packet, possibly starting + // and ending at the same address val_offset = 0; func_offset = val_start - func_start; overlap_size = size; + } else if (val_start < func_start && val_end > func_end) { + // the current packet is completely subsumed in the + // one we are checking against + val_offset = func_start - val_start; + func_offset = 0; + overlap_size = func_end - func_start; } else { - panic("BUG: Missed a case for a partial functional request"); - } - - // Figure out how much of the partial overlap should be copied - // into the packet and not overwrite previously found bytes. - if (bytesValidStart == 0 && bytesValidEnd == 0) { - // No bytes have been copied yet, just set indices - // to found range - bytesValidStart = func_offset; - bytesValidEnd = func_offset + overlap_size; - } else { - // Some bytes have already been copied. Use bytesValid - // indices and offset values to figure out how much data - // to copy and where to copy it to. - - // Indice overlap conditions to check - int a = func_offset - bytesValidStart; - int b = (func_offset + overlap_size) - bytesValidEnd; - int c = func_offset - bytesValidEnd; - int d = (func_offset + overlap_size) - bytesValidStart; - - if (a >= 0 && b <= 0) { - // bytes already in pkt data array are superset of - // found bytes, will not copy any bytes - overlap_size = 0; - } else if (a < 0 && d >= 0 && b <= 0) { - // found bytes will move bytesValidStart towards 0 - overlap_size = bytesValidStart - func_offset; - bytesValidStart = func_offset; - } else if (b > 0 && c <= 0 && a >= 0) { - // found bytes will move bytesValidEnd - // towards end of pkt data array - overlap_size = - (func_offset + overlap_size) - bytesValidEnd; - val_offset += bytesValidEnd - func_offset; - func_offset = bytesValidEnd; - bytesValidEnd += overlap_size; - } else if (a < 0 && b > 0) { - // Found bytes are superset of copied range. Will move - // bytesValidStart towards 0 and bytesValidEnd towards - // end of pkt data array. Need to break copy into two - // pieces so as to not overwrite previously found data. - - // copy the first half - uint8_t *dest = getPtr<uint8_t>() + func_offset; - uint8_t *src = _data + val_offset; - memcpy(dest, src, (bytesValidStart - func_offset)); - - // re-calc the offsets and indices to do the copy - // required for the second half - val_offset += (bytesValidEnd - func_offset); - bytesValidStart = func_offset; - overlap_size = - (func_offset + overlap_size) - bytesValidEnd; - func_offset = bytesValidEnd; - bytesValidEnd += overlap_size; - } else if ((c > 0 && b > 0) - || (a < 0 && d < 0)) { - // region to be copied is discontiguous! Not supported. - panic("BUG: Discontiguous bytes found" - "for functional copying!"); - } + panic("Missed a case for checkFunctional with " + " %s 0x%x size %d, against 0x%x size %d\n", + cmdString(), getAddr(), getSize(), addr, size); } - assert(bytesValidEnd <= getSize()); // copy partial data into the packet's data array uint8_t *dest = getPtr<uint8_t>() + func_offset; uint8_t *src = _data + val_offset; memcpy(dest, src, overlap_size); - // check if we're done filling the functional access - bool done = (bytesValidStart == 0) && (bytesValidEnd == getSize()); - return done; + // initialise the tracking of valid bytes if we have not + // used it already + if (bytesValid.empty()) + bytesValid.resize(getSize(), false); + + // track if we are done filling the functional access + bool all_bytes_valid = true; + + int i = 0; + + // check up to func_offset + for (; all_bytes_valid && i < func_offset; ++i) + all_bytes_valid &= bytesValid[i]; + + // update the valid bytes + for (i = func_offset; i < func_offset + overlap_size; ++i) + bytesValid[i] = true; + + // check the bit after the update we just made + for (; all_bytes_valid && i < getSize(); ++i) + all_bytes_valid &= bytesValid[i]; + + return all_bytes_valid; } } else if (isWrite()) { if (offset >= 0) { |