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amd64: do not touch BIOS reset flag halfword, unless we boot through BIOS

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Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D30872
This commit is contained in:
Konstantin Belousov 2021-06-20 17:58:11 +03:00
parent 60b0ad10dd
commit 33e1287b6a
2 changed files with 10 additions and 5 deletions
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3
sys/amd64/amd64/locore.S
View File

@ -56,9 +56,6 @@
*/
ENTRY(btext)
/* Tell the bios to warmboot next time */
movw $0x1234,0x472
/* Don't trust what the loader gives for rflags. */
pushq $PSL_KERNEL
popfq

12
sys/amd64/amd64/machdep.c
View File

@ -1604,11 +1604,20 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
struct region_descriptor r_gdt;
size_t kstack0_sz;
int late_console;
bool efi_boot;
TSRAW(&thread0, TS_ENTER, __func__, NULL);
kmdp = init_ops.parse_preload_data(modulep);
efi_boot = preload_search_info(kmdp, MODINFO_METADATA |
MODINFOMD_EFI_MAP) != NULL;
if (!efi_boot) {
/* Tell the bios to warmboot next time */
atomic_store_short((u_short *)0x472, 0x1234);
}
physfree += ucode_load_bsp(physfree + KERNBASE);
physfree = roundup2(physfree, PAGE_SIZE);
@ -1760,8 +1769,7 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
* Once bootblocks have updated, we can test directly for
* efi_systbl != NULL here...
*/
if (preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP)
!= NULL)
if (efi_boot)
vty_set_preferred(VTY_VT);
TUNABLE_INT_FETCH("hw.ibrs_disable", &hw_ibrs_disable);