1 // Copyright 2017 The Fuchsia Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <hwreg/internal.h>
6 #include <stdio.h>
7
8 namespace hwreg {
9
10 namespace internal {
11
Print(uint64_t value,char * buf,size_t len) const12 void FieldPrinter::Print(uint64_t value, char* buf, size_t len) const {
13 unsigned num_bits = bit_high_incl_ - bit_low_ + 1;
14 uint64_t mask = internal::ComputeMask<uint64_t>(num_bits);
15 uint64_t val = static_cast<uint64_t>((value >> bit_low_) & mask);
16 #ifdef _KERNEL
17 // The kernel does not support the * directive in printf, so we lose out on
18 // the length-matching padding.
19 snprintf(buf, len, "%s[%u:%u]: 0x%" PRIx64 " (%" PRIu64 ")", name_,
20 bit_high_incl_, bit_low_, val, val);
21 #else
22 int pad_len = (num_bits + 3) / 4;
23 snprintf(buf, len, "%s[%u:%u]: 0x%0*" PRIx64 " (%" PRIu64 ")", name_,
24 bit_high_incl_, bit_low_, pad_len, val, val);
25 #endif // _KERNEL
26 buf[len - 1] = 0;
27 }
28
PrintRegisterPrintf(FieldPrinter fields[],size_t num_fields,uint64_t reg_value,uint64_t fields_mask,int register_width_bytes)29 void PrintRegisterPrintf(FieldPrinter fields[], size_t num_fields,
30 uint64_t reg_value, uint64_t fields_mask,
31 int register_width_bytes) {
32 PrintRegister([](const char* arg) { printf("%s\n", arg); },
33 fields, num_fields, reg_value, fields_mask, register_width_bytes);
34 }
35
36 } // namespace internal
37
38 } // namespace hwreg
39