Remove old i386 setup code
This removes the old i386 setup code. This is done as a separate patch to avoid breaking git bisect as some of the i386 code was also used by the old x86-64 code. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
H. Peter Anvin
Linus Torvalds
parent
91a6c462b0
commit
c397368232
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@ -1,98 +0,0 @@
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/*
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* bootsect.S Copyright (C) 1991, 1992 Linus Torvalds
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*
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* modified by Drew Eckhardt
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* modified by Bruce Evans (bde)
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* modified by Chris Noe (May 1999) (as86 -> gas)
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* gutted by H. Peter Anvin (Jan 2003)
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*
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* BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
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* addresses must be multiplied by 16 to obtain their respective linear
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* addresses. To avoid confusion, linear addresses are written using leading
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* hex while segment addresses are written as segment:offset.
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*
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*/
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#include <asm/boot.h>
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SETUPSECTS = 4 /* default nr of setup-sectors */
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BOOTSEG = 0x07C0 /* original address of boot-sector */
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INITSEG = DEF_INITSEG /* we move boot here - out of the way */
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SETUPSEG = DEF_SETUPSEG /* setup starts here */
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SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
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SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
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/* to be loaded */
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ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
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SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */
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#ifndef SVGA_MODE
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#define SVGA_MODE ASK_VGA
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#endif
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#ifndef RAMDISK
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#define RAMDISK 0
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#endif
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#ifndef ROOT_RDONLY
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#define ROOT_RDONLY 1
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#endif
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.code16
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.text
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.global _start
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_start:
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# Normalize the start address
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jmpl $BOOTSEG, $start2
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start2:
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movw %cs, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw $0x7c00, %sp
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sti
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cld
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movw $bugger_off_msg, %si
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msg_loop:
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lodsb
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andb %al, %al
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jz die
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movb $0xe, %ah
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movw $7, %bx
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int $0x10
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jmp msg_loop
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die:
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# Allow the user to press a key, then reboot
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xorw %ax, %ax
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int $0x16
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int $0x19
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# int 0x19 should never return. In case it does anyway,
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# invoke the BIOS reset code...
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ljmp $0xf000,$0xfff0
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bugger_off_msg:
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.ascii "Direct booting from floppy is no longer supported.\r\n"
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.ascii "Please use a boot loader program instead.\r\n"
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.ascii "\n"
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.ascii "Remove disk and press any key to reboot . . .\r\n"
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.byte 0
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# Kernel attributes; used by setup
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.org 497
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setup_sects: .byte SETUPSECTS
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root_flags: .word ROOT_RDONLY
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syssize: .word SYSSIZE
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swap_dev: .word SWAP_DEV
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ram_size: .word RAMDISK
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vid_mode: .word SVGA_MODE
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root_dev: .word ROOT_DEV
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boot_flag: .word 0xAA55
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@ -1,231 +0,0 @@
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/*
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* BIOS Enhanced Disk Drive support
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* Copyright (C) 2002, 2003, 2004 Dell, Inc.
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* by Matt Domsch <Matt_Domsch@dell.com> October 2002
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* conformant to T13 Committee www.t13.org
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* projects 1572D, 1484D, 1386D, 1226DT
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* disk signature read by Matt Domsch <Matt_Domsch@dell.com>
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* and Andrew Wilks <Andrew_Wilks@dell.com> September 2003, June 2004
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* legacy CHS retrieval by Patrick J. LoPresti <patl@users.sourceforge.net>
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* March 2004
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* Command line option parsing, Matt Domsch, November 2004
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*/
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#include <linux/edd.h>
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#include <asm/setup.h>
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#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
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# It is assumed that %ds == INITSEG here
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movb $0, (EDD_MBR_SIG_NR_BUF)
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movb $0, (EDDNR)
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# Check the command line for options:
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# edd=of disables EDD completely (edd=off)
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# edd=sk skips the MBR test (edd=skipmbr)
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# edd=on re-enables EDD (edd=on)
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pushl %esi
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movw $edd_mbr_sig_start, %di # Default to edd=on
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movl %cs:(cmd_line_ptr), %esi
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andl %esi, %esi
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jz old_cl # Old boot protocol?
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# Convert to a real-mode pointer in fs:si
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movl %esi, %eax
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shrl $4, %eax
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movw %ax, %fs
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andw $0xf, %si
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jmp have_cl_pointer
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# Old-style boot protocol?
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old_cl:
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push %ds # aka INITSEG
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pop %fs
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cmpw $0xa33f, (0x20)
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jne done_cl # No command line at all?
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movw (0x22), %si # Pointer relative to INITSEG
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# fs:si has the pointer to the command line now
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have_cl_pointer:
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# Loop through kernel command line one byte at a time. Just in
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# case the loader is buggy and failed to null-terminate the command line
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# terminate if we get close enough to the end of the segment that we
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# cannot fit "edd=XX"...
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cl_atspace:
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cmpw $-5, %si # Watch for segment wraparound
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jae done_cl
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movl %fs:(%si), %eax
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andb %al, %al # End of line?
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jz done_cl
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cmpl $EDD_CL_EQUALS, %eax
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jz found_edd_equals
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cmpb $0x20, %al # <= space consider whitespace
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ja cl_skipword
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incw %si
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jmp cl_atspace
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cl_skipword:
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cmpw $-5, %si # Watch for segment wraparound
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jae done_cl
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movb %fs:(%si), %al # End of string?
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andb %al, %al
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jz done_cl
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cmpb $0x20, %al
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jbe cl_atspace
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incw %si
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jmp cl_skipword
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found_edd_equals:
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# only looking at first two characters after equals
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# late overrides early on the command line, so keep going after finding something
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movw %fs:4(%si), %ax
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cmpw $EDD_CL_OFF, %ax # edd=of
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je do_edd_off
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cmpw $EDD_CL_SKIP, %ax # edd=sk
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je do_edd_skipmbr
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cmpw $EDD_CL_ON, %ax # edd=on
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je do_edd_on
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jmp cl_skipword
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do_edd_skipmbr:
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movw $edd_start, %di
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jmp cl_skipword
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do_edd_off:
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movw $edd_done, %di
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jmp cl_skipword
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do_edd_on:
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movw $edd_mbr_sig_start, %di
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jmp cl_skipword
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done_cl:
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popl %esi
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jmpw *%di
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# Read the first sector of each BIOS disk device and store the 4-byte signature
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edd_mbr_sig_start:
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movb $0x80, %dl # from device 80
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movw $EDD_MBR_SIG_BUF, %bx # store buffer ptr in bx
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edd_mbr_sig_read:
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movl $0xFFFFFFFF, %eax
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movl %eax, (%bx) # assume failure
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pushw %bx
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movb $READ_SECTORS, %ah
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movb $1, %al # read 1 sector
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movb $0, %dh # at head 0
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movw $1, %cx # cylinder 0, sector 0
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pushw %es
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pushw %ds
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popw %es
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movw $EDDBUF, %bx # disk's data goes into EDDBUF
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pushw %dx # work around buggy BIOSes
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stc # work around buggy BIOSes
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int $0x13
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sti # work around buggy BIOSes
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popw %dx
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popw %es
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popw %bx
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jc edd_mbr_sig_done # on failure, we're done.
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cmpb $0, %ah # some BIOSes do not set CF
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jne edd_mbr_sig_done # on failure, we're done.
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movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
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movl %eax, (%bx) # store success
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incb (EDD_MBR_SIG_NR_BUF) # note that we stored something
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incb %dl # increment to next device
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addw $4, %bx # increment sig buffer ptr
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cmpb $EDD_MBR_SIG_MAX, (EDD_MBR_SIG_NR_BUF) # Out of space?
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jb edd_mbr_sig_read # keep looping
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edd_mbr_sig_done:
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# Do the BIOS Enhanced Disk Drive calls
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# This consists of two calls:
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# int 13h ah=41h "Check Extensions Present"
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# int 13h ah=48h "Get Device Parameters"
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# int 13h ah=08h "Legacy Get Device Parameters"
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#
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# A buffer of size EDDMAXNR*(EDDEXTSIZE+EDDPARMSIZE) is reserved for our use
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# in the boot_params at EDDBUF. The first four bytes of which are
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# used to store the device number, interface support map and version
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# results from fn41. The next four bytes are used to store the legacy
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# cylinders, heads, and sectors from fn08. The following 74 bytes are used to
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# store the results from fn48. Starting from device 80h, fn41, then fn48
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# are called and their results stored in EDDBUF+n*(EDDEXTSIZE+EDDPARMIZE).
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# Then the pointer is incremented to store the data for the next call.
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# This repeats until either a device doesn't exist, or until EDDMAXNR
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# devices have been stored.
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# The one tricky part is that ds:si always points EDDEXTSIZE bytes into
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# the structure, and the fn41 and fn08 results are stored at offsets
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# from there. This removes the need to increment the pointer for
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# every store, and leaves it ready for the fn48 call.
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# A second one-byte buffer, EDDNR, in the boot_params stores
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# the number of BIOS devices which exist, up to EDDMAXNR.
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# In setup.c, copy_edd() stores both boot_params buffers away
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# for later use, as they would get overwritten otherwise.
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# This code is sensitive to the size of the structs in edd.h
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edd_start:
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# %ds points to the bootsector
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# result buffer for fn48
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movw $EDDBUF+EDDEXTSIZE, %si # in ds:si, fn41 results
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# kept just before that
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movb $0x80, %dl # BIOS device 0x80
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edd_check_ext:
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movb $CHECKEXTENSIONSPRESENT, %ah # Function 41
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movw $EDDMAGIC1, %bx # magic
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int $0x13 # make the call
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jc edd_done # no more BIOS devices
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cmpw $EDDMAGIC2, %bx # is magic right?
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jne edd_next # nope, next...
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movb %dl, %ds:-8(%si) # store device number
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movb %ah, %ds:-7(%si) # store version
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movw %cx, %ds:-6(%si) # store extensions
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incb (EDDNR) # note that we stored something
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edd_get_device_params:
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movw $EDDPARMSIZE, %ds:(%si) # put size
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movw $0x0, %ds:2(%si) # work around buggy BIOSes
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movb $GETDEVICEPARAMETERS, %ah # Function 48
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int $0x13 # make the call
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# Don't check for fail return
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# it doesn't matter.
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edd_get_legacy_chs:
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xorw %ax, %ax
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movw %ax, %ds:-4(%si)
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movw %ax, %ds:-2(%si)
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# Ralf Brown's Interrupt List says to set ES:DI to
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# 0000h:0000h "to guard against BIOS bugs"
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pushw %es
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movw %ax, %es
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movw %ax, %di
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pushw %dx # legacy call clobbers %dl
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movb $LEGACYGETDEVICEPARAMETERS, %ah # Function 08
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int $0x13 # make the call
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jc edd_legacy_done # failed
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movb %cl, %al # Low 6 bits are max
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andb $0x3F, %al # sector number
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movb %al, %ds:-1(%si) # Record max sect
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movb %dh, %ds:-2(%si) # Record max head number
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movb %ch, %al # Low 8 bits of max cyl
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shr $6, %cl
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movb %cl, %ah # High 2 bits of max cyl
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movw %ax, %ds:-4(%si)
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edd_legacy_done:
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popw %dx
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popw %es
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movw %si, %ax # increment si
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addw $EDDPARMSIZE+EDDEXTSIZE, %ax
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movw %ax, %si
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edd_next:
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incb %dl # increment to next device
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cmpb $EDDMAXNR, (EDDNR) # Out of space?
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jb edd_check_ext # keep looping
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edd_done:
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#endif
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
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@ -1,94 +0,0 @@
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/* Check if CPU has some minimum CPUID bits
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This runs in 16bit mode so that the caller can still use the BIOS
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to output errors on the screen */
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#include <asm/cpufeature.h>
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#include <asm/msr.h>
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verify_cpu:
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pushfl # Save caller passed flags
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pushl $0 # Kill any dangerous flags
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popfl
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#if CONFIG_X86_MINIMUM_CPU_FAMILY >= 4
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pushfl
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pop %eax
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orl $(1<<18),%eax # try setting AC
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push %eax
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popfl
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pushfl
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popl %eax
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testl $(1<<18),%eax
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jz bad
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#endif
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#if REQUIRED_MASK0 != 0
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pushfl # standard way to check for cpuid
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popl %eax
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movl %eax,%ebx
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xorl $0x200000,%eax
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pushl %eax
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popfl
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pushfl
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popl %eax
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cmpl %eax,%ebx
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pushfl # standard way to check for cpuid
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popl %eax
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movl %eax,%ebx
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xorl $0x200000,%eax
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pushl %eax
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popfl
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pushfl
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popl %eax
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cmpl %eax,%ebx
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jz bad # REQUIRED_MASK0 != 0 requires CPUID
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movl $0x0,%eax # See if cpuid 1 is implemented
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cpuid
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cmpl $0x1,%eax
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jb bad # no cpuid 1
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#if REQUIRED_MASK0 & NEED_CMPXCHG64
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/* Some VIA C3s need magic MSRs to enable CX64. Do this here */
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cmpl $0x746e6543,%ebx # Cent
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jne 1f
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cmpl $0x48727561,%edx # aurH
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jne 1f
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cmpl $0x736c7561,%ecx # auls
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jne 1f
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movl $1,%eax # check model
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cpuid
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movl %eax,%ebx
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shr $8,%ebx
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andl $0xf,%ebx
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cmp $6,%ebx # check family == 6
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jne 1f
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shr $4,%eax
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andl $0xf,%eax
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cmpl $6,%eax # check model >= 6
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jb 1f
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# assume models >= 6 all support this MSR
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movl $MSR_VIA_FCR,%ecx
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rdmsr
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orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
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wrmsr
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1:
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#endif
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movl $0x1,%eax # Does the cpu have what it takes
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cpuid
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#if CONFIG_X86_MINIMUM_CPU_FAMILY > 4
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#error add proper model checking here
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#endif
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andl $REQUIRED_MASK0,%edx
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xorl $REQUIRED_MASK0,%edx
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jnz bad
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#endif /* REQUIRED_MASK0 */
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popfl
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xor %eax,%eax
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ret
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bad:
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popfl
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movl $1,%eax
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ret
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@ -49,10 +49,6 @@
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#define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
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#define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
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in boot_params - treat this as 1 byte */
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#define EDD_CL_EQUALS 0x3d646465 /* "edd=" */
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#define EDD_CL_OFF 0x666f /* "of" for off */
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#define EDD_CL_SKIP 0x6b73 /* "sk" for skipmbr */
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#define EDD_CL_ON 0x6e6f /* "on" for on */
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#ifndef __ASSEMBLY__
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