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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2022 Oxide Computer Company
*/
/*
* Various functions for manipulating regions of bits in standard sized
* integers. Meant to be a replacement for the extant BITX macro and provide
* additional functionality. See bitx64(9F), bitdel64(9F), and bitset64(9f) for
* more information.
*/
#include <sys/debug.h>
#include <sys/stdint.h>
uint8_t
bitx8(uint8_t reg, uint_t high, uint_t low)
{
uint8_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 8);
ASSERT3U(low, <, 8);
mask = (1 << (high - low + 1)) - 1;
return ((reg >> low) & mask);
}
uint16_t
bitx16(uint16_t reg, uint_t high, uint_t low)
{
uint16_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 16);
ASSERT3U(low, <, 16);
mask = (1 << (high - low + 1)) - 1;
return ((reg >> low) & mask);
}
uint32_t
bitx32(uint32_t reg, uint_t high, uint_t low)
{
uint32_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 32);
ASSERT3U(low, <, 32);
mask = (1UL << (high - low + 1)) - 1;
return ((reg >> low) & mask);
}
uint64_t
bitx64(uint64_t reg, uint_t high, uint_t low)
{
uint64_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 64);
ASSERT3U(low, <, 64);
mask = (1ULL << (high - low + 1)) - 1ULL;
return ((reg >> low) & mask);
}
uint8_t
bitset8(uint8_t reg, uint_t high, uint_t low, uint8_t val)
{
uint8_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 8);
ASSERT3U(low, <, 8);
mask = (1 << (high - low + 1)) - 1;
ASSERT0(~mask & val);
reg &= ~(mask << low);
reg |= val << low;
return (reg);
}
uint16_t
bitset16(uint16_t reg, uint_t high, uint_t low, uint16_t val)
{
uint16_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 16);
ASSERT3U(low, <, 16);
mask = (1 << (high - low + 1)) - 1;
ASSERT0(~mask & val);
reg &= ~(mask << low);
reg |= val << low;
return (reg);
}
uint32_t
bitset32(uint32_t reg, uint_t high, uint_t low, uint32_t val)
{
uint32_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 32);
ASSERT3U(low, <, 32);
mask = (1UL << (high - low + 1)) - 1;
ASSERT0(~mask & val);
reg &= ~(mask << low);
reg |= val << low;
return (reg);
}
uint64_t
bitset64(uint64_t reg, uint_t high, uint_t low, uint64_t val)
{
uint64_t mask;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 64);
ASSERT3U(low, <, 64);
mask = (1ULL << (high - low + 1)) - 1ULL;
ASSERT0(~mask & val);
reg &= ~(mask << low);
reg |= val << low;
return (reg);
}
uint64_t
bitdel64(uint64_t val, uint_t high, uint_t low)
{
uint64_t high_val = 0;
uint64_t low_val = 0;
ASSERT3U(high, >=, low);
ASSERT3U(high, <, 64);
ASSERT3U(low, <, 64);
if (low != 0) {
low_val = bitx64(val, low - 1, 0);
}
if (high != 63) {
high_val = bitx64(val, 63, high + 1);
}
return ((high_val << low) | low_val);
}
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