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The first revision of the ACPI specification was released in December 1996, supporting 16, 24 and 32-bit addressing spaces. It was not until August 2000 that ACPI received 64-bit address support as well as support for multiprocessor workstations and servers with revision 2.0.
existing instructions extended to a 64 bit address size (JRCXZ) existing instructions extended to a 64 bit operand size (remaining instructions) Most instructions with a 64 bit operand size encode this using a REX.W prefix; in the absence of the REX.W prefix, the corresponding instruction with 32 bit operand size is encoded. This mechanism also ...
It can access standard ACPI tables such as PCI Memory Configuration Table (MCFG). SFI support was merged into Linux kernel 2.6.32-rc1; [1] the core SFI patch is about 1,000 lines of code. Linux is the first operating system with an SFI implementation. Linux kernel 5.6 marked SFI as obsolete. [2] SFI support was removed in Linux kernel 5.12. [3]
However, not all 64-bit instruction sets support full 64-bit virtual memory addresses; x86-64 and AArch64 for example, support only 48 bits of virtual address, with the remaining 16 bits of the virtual address required to be all zeros (000...) or all ones (111...), and several 64-bit instruction sets support fewer than 64 bits of physical ...
[8] [34] In comparison, the processor mode in a UEFI environment can be either 32-bit (IA-32, AArch32) or 64-bit (x86-64, Itanium, and AArch64). [8] [35] 64-bit UEFI firmware implementations support long mode, which allows applications in the preboot environment to use 64-bit addressing to get direct access to all of the machine's memory. [36]
These comparators are 32- or 64-bit-wide. The HPET is programmed via a memory mapped I/O window that is discoverable via ACPI. The HPET circuit in modern PCs is integrated into the southbridge chip. [a] Each comparator can generate an interrupt when the least significant bits are equal to the corresponding bits of the 64-bit main counter value ...
Early I/O APICs (like 82489DX, SIO.A and PCEB/ESC) only had support for 16 interrupt lines, but later ones like 82093AA (separate chip for PIIX3/PIIX4) had support for 24 interrupt lines. [9] It was packaged as a 64-Pin PQFP. [14] The 82093AA normally connected to the PIIX3/PIIX4 and used its integrated legacy 8259 PICs. [14]
2.16 64-bit processors: ... One terabyte virtual address space; Hardware support for fault tolerance; ... Supports ACPI 2.0 and APM 1.2 System Power Management;