函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\cpu\amd.c Create Date:2022-07-27 08:58:48
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：clear_rdrand_cpuid_bit

函数原型：static void clear_rdrand_cpuid_bit(struct cpuinfo_x86 *c)

返回类型：void

参数：

类型参数名称
struct cpuinfo_x86 *c
832  如果非IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_PM_SLEEP)则返回
839  如果非cpuid_ecx(1)按位与BIT(30)的值或rdrand_force则返回
842  Clear @bit in a MSR @msr.* Retval:* < 0: An error was encountered.* = 0: Bit was already cleared.* > 0: Hardware accepted the MSR write.
848  如果cpuid_ecx(1)按位与BIT(30)则
849  pr_info_once("BIOS may not properly restore RDRAND after suspend, but hypervisor does not support hiding RDRAND via CPUID.\n")
850  返回
853  clear_cpu_cap(c, RDRAND instruction )
854  pr_info_once("BIOS may not properly restore RDRAND after suspend, hiding RDRAND via CPUID. Use rdrand=force to reenable.\n")
调用者
名称描述
init_amd_jg
init_amd_bd