From: H. Peter Anvin <[email protected]> MCA probing support for the new x86 setup code. This implements the same functionality as the assembly version. Signed-off-by: H. Peter Anvin <[email protected]> --- arch/i386/boot/mca.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 43 insertions(+), 0 deletions(-) create mode 100644 arch/i386/boot/mca.c diff --git a/arch/i386/boot/mca.c b/arch/i386/boot/mca.c new file mode 100644 index 0000000..9b68bd1 --- /dev/null +++ b/arch/i386/boot/mca.c @@ -0,0 +1,43 @@ +/* -*- 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" + : "=acdSDm" (err), "=acdSDm" (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; +} -- 1.5.2.2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- x86 setup code rewrite in C - revised
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 01/33] x86 setup: MAINTAINERS: formally take responsibility for the i386 boot code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 02/33] hd.c: remove BIOS/CMOS queries
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 03/33] include/asm-i386/boot.h: This is <asm/boot.h>, not <linux/boot.h>
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 04/33] Unify the CPU features vectors between i386 and x86-64
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 05/33] Change CONFIG_X86_MINIMUM_CPU_MODEL to CONFIG_X86_MINIMUM_CPU_FAMILY
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 06/33] Clean up struct screen_info (<linux/screen_info.h>)
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 07/33] Use a new CPU feature word to cover all Intel features that are spread around
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 08/33] Define zero-page offset 0x1e4 as a scratch field, and use it
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 09/33] Make definitions for struct e820entry and struct e820map consistent
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 10/33] Make struct boot_params a real structure, and remove obsolete fields
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 11/33] x86-64: add CONFIG_PHYSICAL_ALIGN for consistency with i386
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 12/33] x86-64: add symbolic constants for the boot segment selectors
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 13/33] Header file to produce 16-bit code with gcc
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 14/33] Top header file for new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 15/33] Simple bitops for the new x86 setup code.
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 16/33] String-handling functions for the new x86 setup code.
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 17/33] A20 handling code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 18/33] APM probing code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 19/33] Command-line parsing code for the new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 20/33] Console-writing code for the new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 21/33] Version string for the new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 22/33] CPU features verification for the new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 23/33] EDD probing code for the new x86 setup code
- From: "H. Peter Anvin" <[email protected]>
- x86 setup code rewrite in C - revised
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