Method for accelerating self-decompression stage of Linux kernel startup

Abstract

The invention provides a method for accelerating a self-decompression stage of Linux kernel startup, which comprises the following steps: S1, a splitting step: confirming that zImage stored in FLASH is decomposed into n blocks, n being a positive integer; s2, a loading and parallel decompression step: S2.1, loading a first zImage block (zImage-1) into an RAM (Random Access Memory) from a FLASH; s2.2, loading a second zImage block (zImage-2) into the RAM from the FLASH, and meanwhile, decompressing the first zImage block which is loaded into the RAM and is in the step S2.1 in parallel; ...and so on; S2. n, loading the nth zImage block (zImage-n) into the RAM from the FLASH, and simultaneously, and decompressing the (n-1) th zImage block which is loaded into the RAM and is in the previous step S2. N-1 in parallel; s2. N + 1, decompressing the nth zImage block which is already loaded into the RAM; S3, a file restoration step: a first zImage block (zImage-1), a second zImage block (zImage-2),..., and an nth zImage block (zImage-n) in the RAM being respectively corresponding to vmLinux-1, vmLinux-2,..., and vmLinux-n after being decompressed, and merging and restoring the vmLinux block (zImage-1), the vmLinux block (zImage-2),..., and the vmLinux-n into a vmLinux file; and S4, completing a decompression step: executing the vmLinux file, and completing a self-decompression stage.

Description

technical field [0001] The invention relates to the field of Linux systems, in particular to a method for accelerating the self-extracting stage of Linux kernel startup. Background technique [0002] With the continuous development of science and technology, the application of computer operating systems, especially Linux, is becoming more and more common. Generally speaking, the Linux kernel startup process is to first load all the zImages stored in the FLASH into the RAM through the boot program, then decompress the zImages in the RAM into vmLinux, and finally execute vmLinux, where the loading and decompression are completed serially, such as figure 1 shown. [0003] During the boot process of the Linux kernel, you can generally see such as figure 2 The kernel self-extraction interface is shown, and the following is the kernel self-extraction process. Usually, the kernel compression and decompression codes are in the directory kernel / arch / arm / boot / compressed. After the...

AI Technical Summary

Problems solved by technology

The generation of vmlinux is the key to compiling the kernel, but the obtained vmlinux file cannot be programmed into flash for execution

The main problem is that there is not an environment to load files in ELF format

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