119 // . .
120 // +--------------------------------+ 0x0000000000000000
121 //
122 // 6 4 4 4 4
123 // 3 8 7 4 3 0
124 // +------------------+----+-------------------------------------------------+
125 // |00000000 00000000 |1111|1111 11111111 11111111 11111111 11111111 11111111|
126 // +------------------+----+-------------------------------------------------+
127 // | | |
128 // | | * 43-0 Object Offset (44-bits, 16TB address space)
129 // | |
130 // | * 47-44 Metadata Bits (4-bits) 0001 = Marked0 (Address view 16-32TB)
131 // | 0010 = Marked1 (Address view 32-48TB)
132 // | 0100 = Remapped (Address view 64-80TB)
133 // | 1000 = Finalizable (Address view N/A)
134 // |
135 // * 63-48 Fixed (16-bits, always zero)
136 //
137
138 size_t ZPlatformAddressOffsetBits() {
139 const size_t min_address_offset_bits = 42; // 4TB
140 const size_t max_address_offset_bits = 44; // 16TB
141 const size_t address_offset = round_up_power_of_2(MaxHeapSize * ZVirtualToPhysicalRatio);
142 const size_t address_offset_bits = log2_intptr(address_offset);
143 return clamp(address_offset_bits, min_address_offset_bits, max_address_offset_bits);
144 }
145
146 size_t ZPlatformAddressMetadataShift() {
147 return ZPlatformAddressOffsetBits();
148 }
|
119 // . .
120 // +--------------------------------+ 0x0000000000000000
121 //
122 // 6 4 4 4 4
123 // 3 8 7 4 3 0
124 // +------------------+----+-------------------------------------------------+
125 // |00000000 00000000 |1111|1111 11111111 11111111 11111111 11111111 11111111|
126 // +------------------+----+-------------------------------------------------+
127 // | | |
128 // | | * 43-0 Object Offset (44-bits, 16TB address space)
129 // | |
130 // | * 47-44 Metadata Bits (4-bits) 0001 = Marked0 (Address view 16-32TB)
131 // | 0010 = Marked1 (Address view 32-48TB)
132 // | 0100 = Remapped (Address view 64-80TB)
133 // | 1000 = Finalizable (Address view N/A)
134 // |
135 // * 63-48 Fixed (16-bits, always zero)
136 //
137
138 size_t ZPlatformAddressOffsetBits() {
139 const size_t max_address_offset_bits = ZAddressBits - 3;
140 const size_t min_address_offset_bits = max_address_offset_bits - 2;
141 const size_t address_offset = round_up_power_of_2(MaxHeapSize * ZVirtualToPhysicalRatio);
142 const size_t address_offset_bits = log2_intptr(address_offset);
143 return clamp(address_offset_bits, min_address_offset_bits, max_address_offset_bits);
144 }
145
146 size_t ZPlatformAddressMetadataShift() {
147 return ZPlatformAddressOffsetBits();
148 }
|