Lines Matching +full:8 +full:- +full:cpu
1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/arch/x86/kernel/head_64.S -- start in 32bit and switch to 64bit
21 #include <asm/processor-flags.h>
25 #include <asm/nospec-branch.h>
33 * because we need identity-mapped pages.
41 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
86 * be done now, since this also includes setup of the SEV-SNP CPUID table,
94 /* Sanitize CPU configuration */
98 * Derive the kernel's physical-to-virtual offset from the physical and
121 * For SEV guests: Verify that the C-bit is correct. A malicious
122 * hypervisor could lie about the C-bit position to perform a ROP
148 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,
159 /* Sanitize CPU configuration */
164 * SEV-ES guests. In those guests the call to verify_cpu() would cause
166 * CPU bringup.
168 * All non SEV-ES systems, especially Intel systems, need to execute
175 /* Clear %R15 which holds the boot_params pointer on the boot CPU */
180 addq $(init_top_pgt - __START_KERNEL_map), %rax
227 * Set CR4.PGE to re-enable global translations.
235 * used to look up the CPU number. For booting a single CPU, the
236 * CPU number is encoded in smpboot_control.
239 * Bit 0-23 CPU# if STARTUP_xx flags are not set
245 * No control bit set, single CPU bringup. CPU number is provided
246 * in bit 0-23. This is also the boot CPU case (CPU number 0).
274 /* Read the APIC ID from the fix-mapped MMIO space. */
286 /* EAX contains the APIC ID of the current CPU */
310 /* Get the per cpu offset for the given CPU# which is in ECX */
311 movq __per_cpu_offset(,%rcx,8), %rdx
313 xorl %edx, %edx /* zero-extended to clear all of RDX */
317 * Setup a boot time stack - Any secondary CPU will have lost its stack
318 * by now because the cr3-switch above unmaps the real-mode stack.
320 * RDX contains the per-cpu offset
326 * Now that this CPU is running on its own stack, drop the realmode
327 * protection. For the boot CPU the pointer is NULL!
342 movw $(GDT_SIZE-1), (%rsp)
366 * Note that, on SMP, the boot cpu uses init data section until
367 * the per cpu areas are set up.
429 * Entry point for soft restart of a CPU. Invoked from xxx_play_dead() for
430 * restarting the boot CPU or for restarting SEV guest CPUs after CPU hot
450 * of __init code and this handler is also used during CPU offlining/onlining.
455 UNWIND_HINT_IRET_REGS offset=8
472 addq $8, %rsp
480 .balign 8
498 UNWIND_HINT_IRET_REGS offset=8
505 .fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc
520 /* The vector number is currently in the pt_regs->di slot. */
521 pushq %rsi /* pt_regs->si */
522 movq 8(%rsp), %rsi /* RSI = vector number */
523 movq %rdi, 8(%rsp) /* pt_regs->di = RDI */
524 pushq %rdx /* pt_regs->dx */
525 pushq %rcx /* pt_regs->cx */
526 pushq %rax /* pt_regs->ax */
527 pushq %r8 /* pt_regs->r8 */
528 pushq %r9 /* pt_regs->r9 */
529 pushq %r10 /* pt_regs->r10 */
530 pushq %r11 /* pt_regs->r11 */
531 pushq %rbx /* pt_regs->bx */
532 pushq %rbp /* pt_regs->bp */
533 pushq %r12 /* pt_regs->r12 */
534 pushq %r13 /* pt_regs->r13 */
535 pushq %r14 /* pt_regs->r14 */
536 pushq %r15 /* pt_regs->r15 */
550 * paravirtualized INTERRUPT_RETURN and pv-ops don't work that early.
558 UNWIND_HINT_IRET_REGS offset=8
573 addq $8, %rsp
575 /* Pure iret required here - don't use INTERRUPT_RETURN */
582 * Each PGD needs to be 8k long and 8k aligned. We do not
586 * need to worry about whether it has 4k or 8k to work
589 * This ensures PGDs are 8k long:
592 /* This ensures they are 8k-aligned: */
605 .fill 511,8,0
606 .quad level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC
607 .fill PTI_USER_PGD_FILL,8,0
611 .fill 512*EARLY_DYNAMIC_PAGE_TABLES,8,0
620 .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
621 .org init_top_pgt + L4_PAGE_OFFSET*8, 0
622 .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
623 .org init_top_pgt + L4_START_KERNEL*8, 0
624 /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
625 .quad level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC
626 .fill PTI_USER_PGD_FILL,8,0
630 .quad level2_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
631 .fill 511, 8, 0
639 * the CPU supports it or it is enabled. But,
640 * the CPU should ignore the bit.
646 .fill 512,8,0
647 .fill PTI_USER_PGD_FILL,8,0
653 .fill 511,8,0
654 .quad level3_kernel_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC
659 .fill L3_START_KERNEL,8,0
660 /* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
661 .quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
662 .quad level2_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC
683 .fill (512 - 4 - FIXMAP_PMD_NUM),8,0
686 .quad level1_fixmap_pgt + (pgtno << PAGE_SHIFT) - __START_KERNEL_map \
691 .fill 4,8,0
696 .fill 512,8,0
710 #include "../xen/xen-head.S"