ARM Processor. Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
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1 ARM Processor Jin-Soo Kim Computer Systems Laboratory Sungkyunkwan University
2 CPU Architecture
3 CPU & Memory address Memory data CPU 200 ADD r5,r1,r3 PC ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 3
4 von Neumann Architecture Separate CPU and memory Memory holds data and instructions. CPU fetches instructions from memory. CPU manipulates data by performing arithmetic and logical operations CPU registers help out Program Counter (PC) Instruction Register (IR) General-Purpose Registers (GPRs), etc. ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 4
5 Harvard Architecture Data memory address data CPU Program memory address instructions PC ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 5
6 von Neumann vs. Harvard Harvard can t use self-modifying code. Harvard allows two simultaneous memory fetches. Most DSPs use Harvard architecture for streaming data: Greater memory bandwidth More predictable bandwidth ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 6
7 RISC vs. CISC Complex Instruction Set Computer (CISC) Many addressing modes Many complex operations Different instruction formats of varying lengths Reduced Instruction Set Computer (RISC) Load/store Pipelinable instructions ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 7
8 Instruction Set Architecture Supported operations Number of operands Types of operands Addressing modes Fixed vs. variable length Registers visible to the programmer ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 8
9 Multiple Implementations Successful architectures have several implementations: Varying clock speeds Different bus widths Different cache sizes ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 9
10 Assembly Language Textual description of instructions One instruction per line label1 LDR r0, [r8] ADD r4, r0, r1 CMP r4, r5 BGE label1 ; Compare r4 < r5 Labels provide names for addresses Comment Pseudo-ops Define current address, reserve storage, constants, ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 10
11 Introduction to the ARM Architecture
12 Overview (1) Advanced RISC Machine The most widely used 32-bit ISA 98% of the more than 1 billion mobile phones sold used at least one ARM processor (2005) 4 billion shipped in % of all embedded 32-bit RISC processors (2009) ARM architecture has been extended over several versions. ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 12
13 Overview (2) ARM processors developed by licensees DEC StrongARM Marvell (formerly Intel) Xscale Nintendo TI OMAP Qualcomm Snapdragon Samsung Hummingbird/Exynos Apple A4/A5/A5X/A6/A7 Nvidia Tegra ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 13
14 ARM Design Goals High performance Small code size Low power consumption Small silicon area ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 14
15 Application Processors Galaxy S4 (quad-core 1.6GHz + quad-core 1.2GHz Cortex-A7) iphone 4S (dual-core, 800MHz) ipad 2 (dual-core, 1GHz) New ipad (dual-core, 1GHz) Galaxy S2 (dual-core, 1.2GHz) Galaxy S3 (quad-core, 1.4GHz) iphone 3GS (600MHz) iphone 4 (clock speed not disclosed, 800MHz?) ipad (1GHz) Samsung Galaxy S (1GHz) Samsung Galaxy Tab 7 (1GHz) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 15
16 Embedded Processors ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 16
17 Processors Lineup ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 17
18 ARM 7TDMI-S Thumb Debug Multiplier Synthesizable core ICE Implements the ARMv4T architecture Applications ipod from Apple Nintendo DS & Game Boy Advance Most of Nokia s mobile phones Lego Mindstorms NXT iriver portable digital audio players Roomba 500 series from irobot ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 18
19 ARM Architecture (1) RISC architecture A large uniform register file A load/store architecture Simple addressing modes Uniform and fixed-length instruction fields ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 19
20 ARM Architecture (2) Other features Arithmetic/logical operations combined with a shift Conditional execution of almost all instructions Auto-increment (-decrement) addressing modes Load and Store Multiple instructions ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 20
21 ARM Registers 16 user-visible 32-bit registers: r0-r15 r13: Stack Pointer (SP) r14: Link Register (LR) r15: Program Counter (PC) Current Program Status Register (CPSR) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 21
22 ARM Status Bits Every arithmetic, logical, or shifting operation sets CPSR bits: N (Negative), Z (Zero), C (Carry), V (Overflow) Condition codes updated when S bit = 1 Example: 0xffffffff + 0x1 = 0x0 ; NZCV = x7fffffff + 0x1 = 0x ; NZCV = x0 0x1 = 0xffffffff ; NZCV = 1000 ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 22
23 Memory Model A linear collection of (up to 2 32 ) bytes Supports both big-endian & little-endian Controlled by the CFGBIGEND signal (ARM7) CFGBIGEND == 0: Little-endian (default) CFGBIGEND == 1: Big-endian Data types word (32-bit): aligned to 4-byte boundary halfword (16-bit): aligned to 2-byte boundary byte (8-bit) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 23
24 ARM Instructions Basic format Two sources, one destination All arithmetic operations have this form ADD r0, r1, r2 ; r0 = r1 + r2 Operand types Register (r0~r15): ADD r0, r1, r2 Immediate: ADD r0, r1, #4 Memory: LDR r5, [r3, #32] ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 24
25 Thumb Instruction Sets (1) 16-bit instruction set A subset of the most commonly used 32- bit ARM instructions Significantly improved code density at a cost of some reduction in performance Typically 65% of the ARM code size 160% performance of the ARM code when running from a 16-bit memory system ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 25
26 Thumb Instruction Set (2) Transparently decompressed to full 32-bit ARM instructions in real time, without performance loss A processor executing Thumb instructions can change to ARM instructions for performance critical segments #pragma thumb gcc -mthumb gcc -mthumb-interwork ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 26
27 Thumb Registers r8 r12 registers are not visible MOV, CMP, and ADD instructions can access high registers ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 27
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