| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Common place for both 32- and 64-bit entry routines. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/export.h> |
| 7 | #include <linux/linkage.h> |
| 8 | #include <asm/msr-index.h> |
| 9 | #include <asm/unwind_hints.h> |
| 10 | #include <asm/segment.h> |
| 11 | #include <asm/cache.h> |
| 12 | |
| 13 | #include "calling.h" |
| 14 | |
| 15 | .pushsection .noinstr.text, "ax" |
| 16 | |
| 17 | SYM_FUNC_START(entry_ibpb) |
| 18 | movl $MSR_IA32_PRED_CMD, %ecx |
| 19 | movl $PRED_CMD_IBPB, %eax |
| 20 | xorl %edx, %edx |
| 21 | wrmsr |
| 22 | RET |
| 23 | SYM_FUNC_END(entry_ibpb) |
| 24 | /* For KVM */ |
| 25 | EXPORT_SYMBOL_GPL(entry_ibpb); |
| 26 | |
| 27 | .popsection |
| 28 | |
| 29 | /* |
| 30 | * Define the VERW operand that is disguised as entry code so that |
| 31 | * it can be referenced with KPTI enabled. This ensure VERW can be |
| 32 | * used late in exit-to-user path after page tables are switched. |
| 33 | */ |
| 34 | .pushsection .entry.text, "ax" |
| 35 | |
| 36 | .align L1_CACHE_BYTES, 0xcc |
| 37 | SYM_CODE_START_NOALIGN(mds_verw_sel) |
| 38 | UNWIND_HINT_UNDEFINED |
| 39 | ANNOTATE_NOENDBR |
| 40 | .word __KERNEL_DS |
| 41 | .align L1_CACHE_BYTES, 0xcc |
| 42 | SYM_CODE_END(mds_verw_sel); |
| 43 | /* For KVM */ |
| 44 | EXPORT_SYMBOL_GPL(mds_verw_sel); |
| 45 | |
| 46 | .popsection |
| 47 | |
| 48 | THUNK warn_thunk_thunk, __warn_thunk |
| 49 |