The assembler and/or linker thenĬreates the actual segment selectors associated with these directives and When writing application code, you generally create segment selectors That all memory references a program makes are to a single linear-address Programs with flexible and efficient ways to access data.Īll the segment registers are loaded with the same segment selector so Segment Registers There are six segment registers (the names for the corresponding 32-bit ones have a prefix "E" for "extended").Įach of the lower two bytes of the EAX, EBX, ECX, and EDX registers canīe referenced by the names AH, BH, CH, and DH (high bytes) and AL, BL, Registers can be used with the names AX, BX, CX, DX, BP, SP, SI, and DI The following figure shows the lower 16 bits of the general-purpose EBP-Pointer to data on the stack (in the SS segment).To by the ES register destination pointer for string operations. EDI-Pointer to data (or destination) in the segment pointed.ESI-Pointer to data in the segment pointed to by the DS register.ECX-Counter for string and loop operations.EAX-Accumulator for operands and results data.
Operands for address calculations and memory pointers. General-purpose Registers The eight 32-bit general-purposeĭata registers are used to hold operands for logical and arithmetic operations, Registers, segment registers, and status and control registers.
#PENTIUM PROCSSOR SOFTWARE#
There is also a virtual-8086 mode that allows the processor to executeĨ086 code software in the protected, multi-tasking environment.ġ.2 Register Set There are three types of registers: general-purpose data This mode is designedįor fast state snapshot and resumption. It allows applications to use virtual memory addressingĪnd supports multiple programming environment and protections. The processor is set to this modeįollowing by a power-up or a reset and can be switched to protected mode
#PENTIUM PROCSSOR PRO#
Pentium and Prentium Pro processors have this mode to be compatible withĮarly Intel processors such as 8086. System (such as DOS) code runs in the same mode as the user applications. It can also be called "unprotected" mode since operating Theġ Pentium/Prentium Pro Processor 1.1 Modes The Pentium and Pentium Pro processor Volume 3: Operating System Writer's Manual, Intel Corporation, 1996. Intel Corporation, 1996, and Pentium Pro Family Developers Manual, Pro Family Developers Manual, Volume 2: Programmer’s Reference Manual, It has a short description about the Intel Pentium and Pentium Pro processorsĪnd a brief introduction to assembly programming with the Gnu assembler. Provide a brief and concise documentation about Pentium PC architectures.
Pentium and Pentium Pro Architectures A Guide to Programming Pentium/Pentium Pro Processors Kai Li, Princeton University
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