mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 10:36:45 +07:00
5593eaa854
Fix incorrect assembly constraints. In particular, fix memory constraints used inside push..pop, which can cause invalid operation since gcc may generate %esp-relative references. Additionally: outl() should have "dN" not "dn". query_mca() shouldn't listen 16/32-bit registers in an 8-bit only context. has_eflag(): the "mask" is only used well after both the stack pointer and the output registers have been touched; this requires the output registers to be earlyclobbers (=&) and the input to exclude memory (so "ri", not "g"). Thanks to Etienne Lorrain and Chuck Ebbert for prompting this review. Cc: Etienne Lorrain <etienne_lorrain@yahoo.fr> Cc: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
44 lines
945 B
C
44 lines
945 B
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* arch/i386/boot/mca.c
|
|
*
|
|
* Get the MCA system description table
|
|
*/
|
|
|
|
#include "boot.h"
|
|
|
|
int query_mca(void)
|
|
{
|
|
u8 err;
|
|
u16 es, bx, len;
|
|
|
|
asm("pushw %%es ; "
|
|
"int $0x15 ; "
|
|
"setc %0 ; "
|
|
"movw %%es, %1 ; "
|
|
"popw %%es"
|
|
: "=acd" (err), "=acdSD" (es), "=b" (bx)
|
|
: "a" (0xc000));
|
|
|
|
if (err)
|
|
return -1; /* No MCA present */
|
|
|
|
set_fs(es);
|
|
len = rdfs16(bx);
|
|
|
|
if (len > sizeof(boot_params.sys_desc_table))
|
|
len = sizeof(boot_params.sys_desc_table);
|
|
|
|
copy_from_fs(&boot_params.sys_desc_table, bx, len);
|
|
return 0;
|
|
}
|