|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: Gather BIOS EDD info during boot.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1181653389 -3600
# Node ID 699f0c4296204557dee30c399ed304e677b8f6f4
# Parent be33028fcda596d6ebdca89bbb0331a1e3b417ae
x86: Gather BIOS EDD info during boot.
Still needs plumbing to dom0.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/boot/Makefile | 2
xen/arch/x86/boot/cmdline.S | 20 +++++
xen/arch/x86/boot/edd.S | 161 +++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/boot/trampoline.S | 9 +-
xen/arch/x86/boot/video.S | 2
xen/arch/x86/setup.c | 7 +
xen/include/asm-x86/edd.h | 44 +++++++++++
7 files changed, 240 insertions(+), 5 deletions(-)
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/boot/Makefile
--- a/xen/arch/x86/boot/Makefile Tue Jun 12 11:39:51 2007 +0100
+++ b/xen/arch/x86/boot/Makefile Tue Jun 12 14:03:09 2007 +0100
@@ -1,3 +1,3 @@ obj-y += head.o
obj-y += head.o
-head.o: head.S $(TARGET_SUBARCH).S trampoline.S mem.S video.S cmdline.S
+head.o: head.S $(TARGET_SUBARCH).S trampoline.S mem.S video.S cmdline.S edd.S
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/boot/cmdline.S
--- a/xen/arch/x86/boot/cmdline.S Tue Jun 12 11:39:51 2007 +0100
+++ b/xen/arch/x86/boot/cmdline.S Tue Jun 12 14:03:09 2007 +0100
@@ -169,6 +169,24 @@ cmdline_parse_early:
test %eax,%eax
setnz bootsym_phys(skip_realmode)
+.Lparse_edd:
+ /* Check for 'edd=' command-line option. */
+ movl $sym_phys(.Ledd_opt),4(%esp)
+ call .Lfind_option
+ test %eax,%eax
+ jz .Lparse_edid
+ cmpb $'=',3(%eax)
+ jne .Lparse_edid
+ add $4,%eax
+ movb $2,bootsym_phys(opt_edd) /* opt_edd=2: edd=off */
+ cmpw $0x666f,(%eax) /* 0x666f == "of" */
+ je .Lparse_edid
+ decb bootsym_phys(opt_edd) /* opt_edd=1: edd=skipmbr */
+ cmpw $0x6b73,(%eax) /* 0x6b73 == "sk" */
+ je .Lparse_edid
+ decb bootsym_phys(opt_edid) /* opt_edd=0: edd=on (default) */
+
+.Lparse_edid:
/* Check for 'edid=' command-line option. */
movl $sym_phys(.Ledid_opt),4(%esp)
call .Lfind_option
@@ -318,3 +336,5 @@ 1: lodsw
.asciz "force"
.Ledid_no:
.asciz "no"
+.Ledd_opt:
+ .asciz "edd"
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/boot/edd.S
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/x86/boot/edd.S Tue Jun 12 14:03:09 2007 +0100
@@ -0,0 +1,161 @@
+/******************************************************************************
+ * edd.S
+ *
+ * BIOS Enhanced Disk Drive support
+ *
+ * Copyright (C) 2002, 2003, 2004 Dell, Inc.
+ * by Matt Domsch <Matt_Domsch@xxxxxxxx> October 2002
+ * conformant to T13 Committee www.t13.org
+ * projects 1572D, 1484D, 1386D, 1226DT
+ * disk signature read by Matt Domsch <Matt_Domsch@xxxxxxxx>
+ * and Andrew Wilks <Andrew_Wilks@xxxxxxxx> September 2003, June 2004
+ * legacy CHS retrieval by Patrick J. LoPresti <patl@xxxxxxxxxxxxxxxxxxxxx>
+ * March 2004
+ * Command line option parsing, Matt Domsch, November 2004
+ *
+ * Updated and ported for Xen by Keir Fraser <keir@xxxxxxxxxxxxx> June 2007
+ */
+
+ .code16
+
+/* Offset of disc signature in the MBR. */
+#define EDD_MBR_SIG_OFFSET 0x1B8
+
+/* Maximum number of EDD information structures at boot_edd_info. */
+#define EDD_INFO_MAX 6
+
+/* Maximum number of MBR signatures at boot_edd_signature. */
+#define EDD_MBR_SIG_MAX 16
+
+/* Size of components of EDD information structure. */
+#define EDDEXTSIZE 8
+#define EDDPARMSIZE 74
+
+get_edd:
+ cmpb $2, bootsym(opt_edd) # edd=off ?
+ je edd_done
+ cmpb $1, bootsym(opt_edd) # edd=skipmbr ?
+ je edd_start
+
+# Read the first sector of each BIOS disk device and store the 4-byte signature
+edd_mbr_sig_start:
+ movb $0x80, %dl # from device 80
+ movw $bootsym(boot_edd_signature),%bx # store buffer ptr in bx
+edd_mbr_sig_read:
+ movl $0xFFFFFFFF, %eax
+ movl %eax, (%bx) # assume failure
+ pushw %bx
+ movb $0x02, %ah # 0x02 Read Sectors
+ movb $1, %al # read 1 sector
+ movb $0, %dh # at head 0
+ movw $1, %cx # cylinder 0, sector 0
+ pushw %es
+ pushw %ds
+ popw %es
+ movw $bootsym(boot_edd_info), %bx # disk's data goes into info
+ pushw %dx # work around buggy BIOSes
+ stc # work around buggy BIOSes
+ int $0x13
+ sti # work around buggy BIOSes
+ popw %dx
+ popw %es
+ popw %bx
+ jc edd_mbr_sig_done # on failure, we're done.
+ cmpb $0, %ah # some BIOSes do not set CF
+ jne edd_mbr_sig_done # on failure, we're done.
+ movl bootsym(boot_edd_info)+EDD_MBR_SIG_OFFSET,%eax
+ movl %eax, (%bx) # store signature from MBR
+ incb bootsym(boot_edd_signature_nr) # note that we stored something
+ incb %dl # increment to next device
+ addw $4, %bx # increment sig buffer ptr
+ cmpb $EDD_MBR_SIG_MAX,bootsym(boot_edd_signature_nr)
+ jb edd_mbr_sig_read
+edd_mbr_sig_done:
+
+# Do the BIOS Enhanced Disk Drive calls
+# This consists of two calls:
+# int 13h ah=41h "Check Extensions Present"
+# int 13h ah=48h "Get Device Parameters"
+# int 13h ah=08h "Legacy Get Device Parameters"
+#
+# A buffer of size EDD_INFO_MAX*(EDDEXTSIZE+EDDPARMSIZE) is reserved at
+# boot_edd_info, the first four bytes of which are used to store the device
+# number, interface support map and version results from fn41. The next four
+# bytes are used to store the legacy cylinders, heads, and sectors from fn08.
+# The following 74 bytes are used to store the results from fn48.
+# This code is sensitive to the size of the structs in edd.h
+edd_start:
+ /* ds:si points at fn48 results. Fn41 results go immediately before. */
+ movw $bootsym(boot_edd_info)+EDDEXTSIZE, %si
+ movb $0x80, %dl # BIOS device 0x80
+
+edd_check_ext:
+ movb $0x41, %ah # 0x41 Check Extensions Present
+ movw $0x55AA, %bx # magic
+ int $0x13 # make the call
+ jc edd_done # no more BIOS devices
+
+ cmpw $0xAA55, %bx # is magic right?
+ jne edd_next # nope, next...
+
+ movb %dl, %ds:-8(%si) # store device number
+ movb %ah, %ds:-7(%si) # store version
+ movw %cx, %ds:-6(%si) # store extensions
+ incb bootsym(boot_edd_info_nr) # note that we stored something
+
+edd_get_device_params:
+ movw $EDDPARMSIZE, %ds:(%si) # put size
+ movw $0x0, %ds:2(%si) # work around buggy BIOSes
+ movb $0x48, %ah # 0x48 Get Device Parameters
+ int $0x13 # make the call
+ # Don't check for fail return
+ # it doesn't matter.
+edd_get_legacy_chs:
+ xorw %ax, %ax
+ movw %ax, %ds:-4(%si)
+ movw %ax, %ds:-2(%si)
+ # Ralf Brown's Interrupt List says to set ES:DI to
+ # 0000h:0000h "to guard against BIOS bugs"
+ pushw %es
+ movw %ax, %es
+ movw %ax, %di
+ pushw %dx # legacy call clobbers %dl
+ movb $0x08, %ah # 0x08 Legacy Get Device Params
+ int $0x13 # make the call
+ jc edd_legacy_done # failed
+ movb %cl, %al # Low 6 bits are max
+ andb $0x3F, %al # sector number
+ movb %al, %ds:-1(%si) # Record max sect
+ movb %dh, %ds:-2(%si) # Record max head number
+ movb %ch, %al # Low 8 bits of max cyl
+ shr $6, %cl
+ movb %cl, %ah # High 2 bits of max cyl
+ movw %ax, %ds:-4(%si)
+
+edd_legacy_done:
+ popw %dx
+ popw %es
+ movw %si, %ax # increment si
+ addw $EDDPARMSIZE+EDDEXTSIZE, %ax
+ movw %ax, %si
+
+edd_next:
+ incb %dl # increment to next device
+ cmpb $EDD_INFO_MAX,bootsym(boot_edd_info_nr)
+ jb edd_check_ext
+
+edd_done:
+ ret
+
+opt_edd:
+ .byte 0 # edd=on/off/skipmbr
+
+.globl boot_edd_info_nr, boot_edd_signature_nr
+boot_edd_info_nr:
+ .byte 0
+boot_edd_signature_nr:
+ .byte 0
+boot_edd_signature:
+ .fill EDD_MBR_SIG_MAX*4,1,0
+boot_edd_info:
+ .fill 512,1,0 # big enough for a disc sector
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/boot/trampoline.S
--- a/xen/arch/x86/boot/trampoline.S Tue Jun 12 11:39:51 2007 +0100
+++ b/xen/arch/x86/boot/trampoline.S Tue Jun 12 14:03:09 2007 +0100
@@ -142,17 +142,19 @@ 1: mov $(BOOT_TRAMPOLINE>>4),%a
mov %ax,%es
mov %ax,%ss
- /* Stack grows down from 0x9200. Initialise IDT and enable irqs. */
- mov $0x2000,%sp
+ /* Stack grows down from 0x93000. Initialise IDT and enable irqs. */
+ mov $0x3000,%sp
lidt bootsym(rm_idt)
sti
/*
* Do real-mode work:
* 1. Get memory map.
- * 2. Set video mode.
+ * 2. Get Enhanced Disk Drive (EDD) information.
+ * 3. Set video mode.
*/
call get_memory_map
+ call get_edd
call video
/* Disable irqs before returning to protected mode. */
@@ -187,4 +189,5 @@ rm_idt: .word 256*4-1, 0, 0
rm_idt: .word 256*4-1, 0, 0
#include "mem.S"
+#include "edd.S"
#include "video.S"
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/boot/video.S
--- a/xen/arch/x86/boot/video.S Tue Jun 12 11:39:51 2007 +0100
+++ b/xen/arch/x86/boot/video.S Tue Jun 12 14:03:09 2007 +0100
@@ -15,7 +15,7 @@
#include "video.h"
-#define modelist (0x2000)
+#define modelist (0x3000)
/* Retrieve Extended Display Identification Data. */
#define CONFIG_FIRMWARE_EDID
diff -r be33028fcda5 -r 699f0c429620 xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c Tue Jun 12 11:39:51 2007 +0100
+++ b/xen/arch/x86/setup.c Tue Jun 12 14:03:09 2007 +0100
@@ -34,6 +34,7 @@
#include <asm/e820.h>
#include <acm/acm_hooks.h>
#include <xen/kexec.h>
+#include <asm/edd.h>
#if defined(CONFIG_X86_64)
#define BOOTSTRAP_DIRECTMAP_END (1UL << 32)
@@ -490,6 +491,12 @@ void __init __start_xen(multiboot_info_t
}
}
+ printk("Disc information:\n");
+ printk(" Found %d MBR signatures\n",
+ bootsym(boot_edd_signature_nr));
+ printk(" Found %d EDD information structures\n",
+ bootsym(boot_edd_info_nr));
+
/* Check that we have at least one Multiboot module. */
if ( !(mbi->flags & MBI_MODULES) || (mbi->mods_count == 0) )
EARLY_FAIL("dom0 kernel not specified. "
diff -r be33028fcda5 -r 699f0c429620 xen/include/asm-x86/edd.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/asm-x86/edd.h Tue Jun 12 14:03:09 2007 +0100
@@ -0,0 +1,44 @@
+/******************************************************************************
+ * edd.h
+ *
+ * Copyright (C) 2002, 2003, 2004 Dell Inc.
+ * by Matt Domsch <Matt_Domsch@xxxxxxxx>
+ *
+ * structures and definitions for the int 13h, ax={41,48}h
+ * BIOS Enhanced Disk Drive Services
+ * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
+ * available at http://www.t13.org/docs2002/d1572r0.pdf. It is
+ * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __XEN_EDD_H__
+#define __XEN_EDD_H__
+
+struct edd_info {
+ /* Int13, Fn48: Check Extensions Present. */
+ u8 device; /* %dl: device */
+ u8 version; /* %ah: major version */
+ u16 interface_support; /* %cx: interface support bitmap */
+ /* Int13, Fn08: Legacy Get Device Parameters. */
+ u16 legacy_max_cylinder; /* %cl[7:6]:%ch: maximum cylinder number */
+ u8 legacy_max_head; /* %dh: maximum head number */
+ u8 legacy_sectors_per_track; /* %cl[5:0]: maximum sector number */
+ /* Int13, Fn41: Get Device Parameters */
+ u8 edd_device_params[74]; /* as filled into %ds:%si */
+} __attribute__ ((packed));
+
+extern u32 boot_edd_signature[];
+extern u8 boot_edd_signature_nr;
+extern struct edd_info boot_edd_info[];
+extern u8 boot_edd_info_nr;
+
+#endif /* __XEN_EDD_H__ */
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |