Commit fcaf0e9c authored by Linus Torvalds's avatar Linus Torvalds

Merge http://mdomsch.bkbits.net/linux-2.5-edd-tolinus

into home.transmeta.com:/home/torvalds/v2.5/linux
parents 5c55930b cc9496d5
......@@ -31,6 +31,7 @@ Offset Type Description
0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
0x1e8 char number of entries in E820MAP (below)
0x1e9 unsigned char number of entries in EDDBUF (below)
0x1f1 char size of setup.S, number of sectors
0x1f2 unsigned short MOUNT_ROOT_RDONLY (if !=0)
0x1f4 unsigned short size of compressed kernel-part in the
......@@ -66,6 +67,7 @@ Offset Type Description
0x220 4 bytes (setup.S)
0x224 unsigned short setup.S heap end pointer
0x2d0 - 0x600 E820MAP
0x600 - 0x7D4 EDDBUF (setup.S)
0x800 string, 2K max COMMAND_LINE, the kernel commandline as
copied using CL_OFFSET.
......
......@@ -1094,3 +1094,11 @@ CONFIG_SCx200
This support is also available as a module. If compiled as a
module, it will be called scx200.o.
CONFIG_EDD
Say Y or M here if you want to enable BIOS Enhanced Disk Drive
Services real mode BIOS calls to determine which disk
BIOS tries boot from. This information is then exported via driverfs.
This option is experimental, but believed to be safe,
and most disk controller BIOS vendors do not yet implement this feature.
......@@ -45,6 +45,9 @@
* New A20 code ported from SYSLINUX by H. Peter Anvin. AMD Elan bugfixes
* by Robert Schwebel, December 2001 <robert@schwebel.de>
*
* BIOS Enhanced Disk Drive support
* by Matt Domsch <Matt_Domsch@dell.com> September 2002
*
*/
#include <linux/config.h>
......@@ -53,6 +56,7 @@
#include <linux/compile.h>
#include <asm/boot.h>
#include <asm/e820.h>
#include <asm/edd.h>
#include <asm/page.h>
/* Signature words to ensure LILO loaded us right */
......@@ -543,6 +547,49 @@ no_32_apm_bios:
done_apm_bios:
#endif
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
# Do the BIOS Enhanced Disk Drive calls
# This code is sensitive to the size of the structs in edd.h
edd_start:
# %ds points to the bootsector
# result buffer for fn48
movw $EDDBUF+EDDEXTSIZE, %si # in ds:si, fn41 results
# kept just before that
movb $0, (EDDNR) # zero value at EDDNR
movb $0x80, %dl # BIOS device 0x80
edd_check_ext:
movb $0x41, %ah # Function 41
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:-4(%si) # store device number
movb %ah, %ds:-3(%si) # store version
movw %cx, %ds:-2(%si) # store extensions
incb (EDDNR) # note that we stored something
edd_get_device_params:
movw $EDDPARMSIZE, %ds:(%si) # put size
movb $0x48, %ah # Function 48
int $0x13 # make the call
# Don't check for fail return
# it doesn't matter.
movw %si, %ax # increment si
addw $EDDPARMSIZE+EDDEXTSIZE, %ax
movw %ax, %si
edd_next:
incb %dl # increment to next device
cmpb $EDDMAXNR, (EDDNR) # Out of space?
jb edd_check_ext # keep looping
edd_done:
#endif
# Now we want to move to protected mode ...
cmpw $0, %cs:realmode_swtch
jz rmodeswtch_normal
......
......@@ -216,6 +216,10 @@ tristate '/dev/cpu/microcode - Intel IA32 CPU microcode support' CONFIG_MICROCOD
tristate '/dev/cpu/*/msr - Model-specific register support' CONFIG_X86_MSR
tristate '/dev/cpu/*/cpuid - CPU information support' CONFIG_X86_CPUID
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
tristate 'BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)' CONFIG_EDD
fi
choice 'High Memory Support' \
"off CONFIG_NOHIGHMEM \
4GB CONFIG_HIGHMEM4G \
......
......@@ -70,6 +70,7 @@ CONFIG_X86_MCE_P4THERMAL=y
# CONFIG_MICROCODE is not set
# CONFIG_X86_MSR is not set
# CONFIG_X86_CPUID is not set
# CONFIG_EDD is not set
CONFIG_NOHIGHMEM=y
# CONFIG_HIGHMEM4G is not set
# CONFIG_HIGHMEM64G is not set
......
......@@ -28,6 +28,7 @@ obj-$(CONFIG_X86_IO_APIC) += io_apic.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o
obj-$(CONFIG_X86_NUMAQ) += numaq.o
obj-$(CONFIG_PROFILING) += profile.o
obj-$(CONFIG_EDD) += edd.o
EXTRA_AFLAGS := -traditional
......
This diff is collapsed.
......@@ -31,6 +31,7 @@
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/nmi.h>
#include <asm/edd.h>
extern void dump_thread(struct pt_regs *, struct user *);
extern spinlock_t rtc_lock;
......@@ -201,3 +202,8 @@ EXPORT_SYMBOL(kmap_atomic);
EXPORT_SYMBOL(kunmap_atomic);
EXPORT_SYMBOL(kmap_atomic_to_page);
#endif
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
EXPORT_SYMBOL(eddnr);
#endif
......@@ -36,6 +36,7 @@
#include <linux/highmem.h>
#include <asm/e820.h>
#include <asm/mpspec.h>
#include <asm/edd.h>
#include <asm/setup.h>
#include <asm/arch_hooks.h>
#include "setup_arch_pre.h"
......@@ -466,6 +467,22 @@ static int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
return 0;
}
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
unsigned char eddnr;
struct edd_info edd[EDDNR];
/**
* copy_edd() - Copy the BIOS EDD information into a safe place.
*
*/
static inline void copy_edd(void)
{
eddnr = EDD_NR;
memcpy(edd, EDD_BUF, sizeof(edd));
}
#else
#define copy_edd() do {} while (0)
#endif
/*
* Do NOT EVER look at the BIOS memory size location.
* It does not work on many machines.
......@@ -843,6 +860,7 @@ void __init setup_arch(char **cmdline_p)
#endif
ARCH_SETUP
setup_memory_region();
copy_edd();
if (!MOUNT_ROOT_RDONLY)
root_mountflags &= ~MS_RDONLY;
......
/*
* linux/include/asm-i386/edd.h
* Copyright (C) 2002 Dell Computer Corporation
* by Matt Domsch <Matt_Domsch@dell.com>
*
* 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
*
* In a nutshell, arch/i386/boot/setup.S populates a scratch table
* in the empty_zero_block that contains a list of BIOS-enumerated
* boot devices.
* In arch/i386/kernel/setup.c, this information is
* transferred into the edd structure, and in arch/i386/kernel/edd.c, that
* information is used to identify BIOS boot disk. The code in setup.S
* is very sensitive to the size of these structures.
*
* 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 _ASM_I386_EDD_H
#define _ASM_I386_EDD_H
#define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF
in empty_zero_block - treat this as 1 byte */
#define EDDBUF 0x600 /* addr of edd_info structs in empty_zero_block */
#define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */
#define EDDEXTSIZE 4 /* change these if you muck with the structures */
#define EDDPARMSIZE 74
#ifndef __ASSEMBLY__
#define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)
#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
#define EDD_EXT_64BIT_EXTENSIONS (1 << 3)
#define EDD_INFO_DMA_BOUNDRY_ERROR_TRANSPARENT (1 << 0)
#define EDD_INFO_GEOMETRY_VALID (1 << 1)
#define EDD_INFO_REMOVABLE (1 << 2)
#define EDD_INFO_WRITE_VERIFY (1 << 3)
#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)
#define EDD_INFO_LOCKABLE (1 << 5)
#define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)
#define EDD_INFO_USE_INT13_FN50 (1 << 7)
struct edd_device_params {
u16 length;
u16 info_flags;
u32 num_default_cylinders;
u32 num_default_heads;
u32 sectors_per_track;
u64 number_of_sectors;
u16 bytes_per_sector;
u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
u16 key; /* = 0xBEDD */
u8 device_path_info_length; /* = 44 */
u8 reserved2;
u16 reserved3;
u8 host_bus_type[4];
u8 interface_type[8];
union {
struct {
u16 base_address;
u16 reserved1;
u32 reserved2;
} __attribute__ ((packed)) isa;
struct {
u8 bus;
u8 slot;
u8 function;
u8 channel;
u32 reserved;
} __attribute__ ((packed)) pci;
/* pcix is same as pci */
struct {
u64 reserved;
} __attribute__ ((packed)) ibnd;
struct {
u64 reserved;
} __attribute__ ((packed)) xprs;
struct {
u64 reserved;
} __attribute__ ((packed)) htpt;
struct {
u64 reserved;
} __attribute__ ((packed)) unknown;
} interface_path;
union {
struct {
u8 device;
u8 reserved1;
u16 reserved2;
u32 reserved3;
u64 reserved4;
} __attribute__ ((packed)) ata;
struct {
u8 device;
u8 lun;
u8 reserved1;
u8 reserved2;
u32 reserved3;
u64 reserved4;
} __attribute__ ((packed)) atapi;
struct {
u16 id;
u64 lun;
u16 reserved1;
u32 reserved2;
} __attribute__ ((packed)) scsi;
struct {
u64 serial_number;
u64 reserved;
} __attribute__ ((packed)) usb;
struct {
u64 eui;
u64 reserved;
} __attribute__ ((packed)) i1394;
struct {
u64 wwid;
u64 lun;
} __attribute__ ((packed)) fibre;
struct {
u64 identity_tag;
u64 reserved;
} __attribute__ ((packed)) i2o;
struct {
u32 array_number;
u32 reserved1;
u64 reserved2;
} __attribute((packed)) raid;
struct {
u8 device;
u8 reserved1;
u16 reserved2;
u32 reserved3;
u64 reserved4;
} __attribute__ ((packed)) sata;
struct {
u64 reserved1;
u64 reserved2;
} __attribute__ ((packed)) unknown;
} device_path;
u8 reserved4;
u8 checksum;
} __attribute__ ((packed));
struct edd_info {
u8 device;
u8 version;
u16 interface_support;
struct edd_device_params params;
} __attribute__ ((packed));
extern struct edd_info edd[EDDNR];
extern unsigned char eddnr;
#endif /*!__ASSEMBLY__ */
#endif /* _ASM_I386_EDD_H */
......@@ -37,6 +37,8 @@
#define KERNEL_START (*(unsigned long *) (PARAM+0x214))
#define INITRD_START (*(unsigned long *) (PARAM+0x218))
#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))
#define EDD_NR (*(unsigned char *) (PARAM+EDDNR))
#define EDD_BUF ((struct edd_info *) (PARAM+EDDBUF))
#define COMMAND_LINE ((char *) (PARAM+2048))
#define COMMAND_LINE_SIZE 256
......
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