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amd64: do not touch low memory in AP startup unless we used legacy boot

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Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D31121
This commit is contained in:
Konstantin Belousov 2021-07-22 19:27:21 +03:00
parent 6a3821369f
commit 48216088b1
1 changed files with 6 additions and 3 deletions
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9
sys/amd64/amd64/mp_machdep.c
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@ -450,13 +450,16 @@ start_all_aps(void)
}
/* save the current value of the warm-start vector */
mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
if (!efi_boot)
mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
outb(CMOS_REG, BIOS_RESET);
mpbiosreason = inb(CMOS_DATA);
/* setup a vector to our boot code */
*((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
*((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
if (!efi_boot) {
*((volatile u_short *)WARMBOOT_OFF) = WARMBOOT_TARGET;
*((volatile u_short *)WARMBOOT_SEG) = (boot_address >> 4);
}
outb(CMOS_REG, BIOS_RESET);
outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */