Changeset View

Standalone View

Show First 20 Lines • Show All 227 Lines • ▼ Show 20 Lines	initializecpu(void)
cr4 = rcr4();		cr4 = rcr4();
if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {		if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
cr4 \|= CR4_FXSR \| CR4_XMM;		cr4 \|= CR4_FXSR \| CR4_XMM;
cpu_fxsr = hw_instruction_sse = 1;		cpu_fxsr = hw_instruction_sse = 1;
}		}
if (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE)		if (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE)
cr4 \|= CR4_FSGSBASE;		cr4 \|= CR4_FSGSBASE;

		if (cpu_stdext_feature2 & CPUID_STDEXT2_PKU)
		cr4 \|= CR4_PKE;

/*		/*
* Postpone enabling the SMEP on the boot CPU until the page		* Postpone enabling the SMEP on the boot CPU until the page
* tables are switched from the boot loader identity mapping		* tables are switched from the boot loader identity mapping
* to the kernel tables. The boot loader enables the U bit in		* to the kernel tables. The boot loader enables the U bit in
* its tables.		* its tables.
*/		*/
if (!IS_BSP()) {		if (!IS_BSP()) {
if (cpu_stdext_feature & CPUID_STDEXT_SMEP)		if (cpu_stdext_feature & CPUID_STDEXT_SMEP)
▲ Show 20 Lines • Show All 55 Lines • Show Last 20 Lines