Differential D14282 Diff 39221 sys/amd64/amd64/mpboot.S

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sys/amd64/amd64/mpboot.S

Show First 20 Lines • Show All 215 Lines • ▼ Show 20 Lines	lgdt_desc:
.word gdtend-gdt /* Length */		.word gdtend-gdt /* Length */
.long gdt-mptramp_start /* Offset plus %ds << 4 */		.long gdt-mptramp_start /* Offset plus %ds << 4 */

.globl mptramp_end		.globl mptramp_end
mptramp_end:		mptramp_end:

/*		/*
* From here on down is executed in the kernel .text section.		* From here on down is executed in the kernel .text section.
*
* Load a real %cr3 that has all the direct map stuff and switches
* off the 1GB replicated mirror. Load a stack pointer and jump
* into AP startup code in C.
*/		*/
.text		.text
.code64		.code64
.p2align 4,0		.p2align 4,0
entry_64:		entry_64:
		/*
		* If the BSP reported NXE support, enable EFER.NXE for all APs
		* prior to loading %cr3. This avoids page faults if the AP
		* encounters memory marked with the NX bit prior to detecting and
		* enabling NXE support.
		*/
		movq pg_nx, %rbx
		kibUnsubmitted Done Inline Actions I do not think that you need a new variable for this. Compare pg_nx with 0 and set EFER_NXE bit if not zero. kib: I do not think that you need a new variable for this. Compare pg_nx with 0 and set EFER_NXE…
		jtlAuthorUnsubmitted Done Inline Actions Good point! I'll change it. jtl: Good point! I'll change it.
		testq %rbx, %rbx
		je 1f
		movl $MSR_EFER, %ecx
		rdmsr
		orl $EFER_NXE, %eax
		wrmsr

		1:
		/*
		* Load a real %cr3 that has all the direct map stuff and switches
		* off the 1GB replicated mirror. Load a stack pointer and jump
		* into AP startup code in C.
		*/
movq KPML4phys, %rax		movq KPML4phys, %rax
movq %rax, %cr3		movq %rax, %cr3
movq bootSTK, %rsp		movq bootSTK, %rsp
jmp init_secondary		jmp init_secondary