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Diffstat (limited to 'arch/i386/boot/setup.S')
| -rw-r--r-- | arch/i386/boot/setup.S | 1028 |
1 files changed, 1028 insertions, 0 deletions
diff --git a/arch/i386/boot/setup.S b/arch/i386/boot/setup.S new file mode 100644 index 000000000000..a934ab32bf8e --- /dev/null +++ b/arch/i386/boot/setup.S @@ -0,0 +1,1028 @@ +/* + * setup.S Copyright (C) 1991, 1992 Linus Torvalds + * + * setup.s is responsible for getting the system data from the BIOS, + * and putting them into the appropriate places in system memory. + * both setup.s and system has been loaded by the bootblock. + * + * This code asks the bios for memory/disk/other parameters, and + * puts them in a "safe" place: 0x90000-0x901FF, ie where the + * boot-block used to be. It is then up to the protected mode + * system to read them from there before the area is overwritten + * for buffer-blocks. + * + * Move PS/2 aux init code to psaux.c + * (troyer@saifr00.cfsat.Honeywell.COM) 03Oct92 + * + * some changes and additional features by Christoph Niemann, + * March 1993/June 1994 (Christoph.Niemann@linux.org) + * + * add APM BIOS checking by Stephen Rothwell, May 1994 + * (sfr@canb.auug.org.au) + * + * High load stuff, initrd support and position independency + * by Hans Lermen & Werner Almesberger, February 1996 + * <lermen@elserv.ffm.fgan.de>, <almesber@lrc.epfl.ch> + * + * Video handling moved to video.S by Martin Mares, March 1996 + * <mj@k332.feld.cvut.cz> + * + * Extended memory detection scheme retwiddled by orc@pell.chi.il.us (david + * parsons) to avoid loadlin confusion, July 1997 + * + * Transcribed from Intel (as86) -> AT&T (gas) by Chris Noe, May 1999. + * <stiker@northlink.com> + * + * Fix to work around buggy BIOSes which dont use carry bit correctly + * and/or report extended memory in CX/DX for e801h memory size detection + * call. As a result the kernel got wrong figures. The int15/e801h docs + * from Ralf Brown interrupt list seem to indicate AX/BX should be used + * anyway. So to avoid breaking many machines (presumably there was a reason + * to orginally use CX/DX instead of AX/BX), we do a kludge to see + * if CX/DX have been changed in the e801 call and if so use AX/BX . + * Michael Miller, April 2001 <michaelm@mjmm.org> + * + * New A20 code ported from SYSLINUX by H. Peter Anvin. AMD Elan bugfixes + * by Robert Schwebel, December 2001 <robert@schwebel.de> + */ + +#include <linux/config.h> +#include <asm/segment.h> +#include <linux/version.h> +#include <linux/compile.h> +#include <asm/boot.h> +#include <asm/e820.h> +#include <asm/page.h> + +/* Signature words to ensure LILO loaded us right */ +#define SIG1 0xAA55 +#define SIG2 0x5A5A + +INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way +SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536). +SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment + # ... and the former contents of CS + +DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020 + +.code16 +.globl begtext, begdata, begbss, endtext, enddata, endbss + +.text +begtext: +.data +begdata: +.bss +begbss: +.text + +start: + jmp trampoline + +# This is the setup header, and it must start at %cs:2 (old 0x9020:2) + + .ascii "HdrS" # header signature + .word 0x0203 # header version number (>= 0x0105) + # or else old loadlin-1.5 will fail) +realmode_swtch: .word 0, 0 # default_switch, SETUPSEG +start_sys_seg: .word SYSSEG + .word kernel_version # pointing to kernel version string + # above section of header is compatible + # with loadlin-1.5 (header v1.5). Don't + # change it. + +type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin, + # Bootlin, SYSLX, bootsect...) + # See Documentation/i386/boot.txt for + # assigned ids + +# flags, unused bits must be zero (RFU) bit within loadflags +loadflags: +LOADED_HIGH = 1 # If set, the kernel is loaded high +CAN_USE_HEAP = 0x80 # If set, the loader also has set + # heap_end_ptr to tell how much + # space behind setup.S can be used for + # heap purposes. + # Only the loader knows what is free +#ifndef __BIG_KERNEL__ + .byte 0 +#else + .byte LOADED_HIGH +#endif + +setup_move_size: .word 0x8000 # size to move, when setup is not + # loaded at 0x90000. We will move setup + # to 0x90000 then just before jumping + # into the kernel. However, only the + # loader knows how much data behind + # us also needs to be loaded. + +code32_start: # here loaders can put a different + # start address for 32-bit code. +#ifndef __BIG_KERNEL__ + .long 0x1000 # 0x1000 = default for zImage +#else + .long 0x100000 # 0x100000 = default for big kernel +#endif + +ramdisk_image: .long 0 # address of loaded ramdisk image + # Here the loader puts the 32-bit + # address where it loaded the image. + # This only will be read by the kernel. + +ramdisk_size: .long 0 # its size in bytes + +bootsect_kludge: + .long 0 # obsolete + +heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later) + # space from here (exclusive) down to + # end of setup code can be used by setup + # for local heap purposes. + +pad1: .word 0 +cmd_line_ptr: .long 0 # (Header version 0x0202 or later) + # If nonzero, a 32-bit pointer + # to the kernel command line. + # The command line should be + # located between the start of + # setup and the end of low + # memory (0xa0000), or it may + # get overwritten before it + # gets read. If this field is + # used, there is no longer + # anything magical about the + # 0x90000 segment; the setup + # can be located anywhere in + # low memory 0x10000 or higher. + +ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff + # (Header version 0x0203 or later) + # The highest safe address for + # the contents of an initrd + +trampoline: call start_of_setup + .align 16 + # The offset at this point is 0x240 + .space (0x7ff-0x240+1) # E820 & EDD space (ending at 0x7ff) +# End of setup header ##################################################### + +start_of_setup: +# Bootlin depends on this being done early + movw $0x01500, %ax + movb $0x81, %dl + int $0x13 + +#ifdef SAFE_RESET_DISK_CONTROLLER +# Reset the disk controller. + movw $0x0000, %ax + movb $0x80, %dl + int $0x13 +#endif + +# Set %ds = %cs, we know that SETUPSEG = %cs at this point + movw %cs, %ax # aka SETUPSEG + movw %ax, %ds +# Check signature at end of setup + cmpw $SIG1, setup_sig1 + jne bad_sig + + cmpw $SIG2, setup_sig2 + jne bad_sig + + jmp good_sig1 + +# Routine to print asciiz string at ds:si +prtstr: + lodsb + andb %al, %al + jz fin + + call prtchr + jmp prtstr + +fin: ret + +# Space printing +prtsp2: call prtspc # Print double space +prtspc: movb $0x20, %al # Print single space (note: fall-thru) + +# Part of above routine, this one just prints ascii al +prtchr: pushw %ax + pushw %cx + movw $7,%bx + movw $0x01, %cx + movb $0x0e, %ah + int $0x10 + popw %cx + popw %ax + ret + +beep: movb $0x07, %al + jmp prtchr + +no_sig_mess: .string "No setup signature found ..." + +good_sig1: + jmp good_sig + +# We now have to find the rest of the setup code/data +bad_sig: + movw %cs, %ax # SETUPSEG + subw $DELTA_INITSEG, %ax # INITSEG + movw %ax, %ds + xorb %bh, %bh + movb (497), %bl # get setup sect from bootsect + subw $4, %bx # LILO loads 4 sectors of setup + shlw $8, %bx # convert to words (1sect=2^8 words) + movw %bx, %cx + shrw $3, %bx # convert to segment + addw $SYSSEG, %bx + movw %bx, %cs:start_sys_seg +# Move rest of setup code/data to here + movw $2048, %di # four sectors loaded by LILO + subw %si, %si + pushw %cs + popw %es + movw $SYSSEG, %ax + movw %ax, %ds + rep + movsw + movw %cs, %ax # aka SETUPSEG + movw %ax, %ds + cmpw $SIG1, setup_sig1 + jne no_sig + + cmpw $SIG2, setup_sig2 + jne no_sig + + jmp good_sig + +no_sig: + lea no_sig_mess, %si + call prtstr + +no_sig_loop: + hlt + jmp no_sig_loop + +good_sig: + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ax, %ds +# Check if an old loader tries to load a big-kernel + testb $LOADED_HIGH, %cs:loadflags # Do we have a big kernel? + jz loader_ok # No, no danger for old loaders. + + cmpb $0, %cs:type_of_loader # Do we have a loader that + # can deal with us? + jnz loader_ok # Yes, continue. + + pushw %cs # No, we have an old loader, + popw %ds # die. + lea loader_panic_mess, %si + call prtstr + + jmp no_sig_loop + +loader_panic_mess: .string "Wrong loader, giving up..." + +loader_ok: +# Get memory size (extended mem, kB) + + xorl %eax, %eax + movl %eax, (0x1e0) +#ifndef STANDARD_MEMORY_BIOS_CALL + movb %al, (E820NR) +# Try three different memory detection schemes. First, try +# e820h, which lets us assemble a memory map, then try e801h, +# which returns a 32-bit memory size, and finally 88h, which +# returns 0-64m + +# method E820H: +# the memory map from hell. e820h returns memory classified into +# a whole bunch of different types, and allows memory holes and +# everything. We scan through this memory map and build a list +# of the first 32 memory areas, which we return at [E820MAP]. +# This is documented at http://www.acpi.info/, in the ACPI 2.0 specification. + +#define SMAP 0x534d4150 + +meme820: + xorl %ebx, %ebx # continuation counter + movw $E820MAP, %di # point into the whitelist + # so we can have the bios + # directly write into it. + +jmpe820: + movl $0x0000e820, %eax # e820, upper word zeroed + movl $SMAP, %edx # ascii 'SMAP' + movl $20, %ecx # size of the e820rec + pushw %ds # data record. + popw %es + int $0x15 # make the call + jc bail820 # fall to e801 if it fails + + cmpl $SMAP, %eax # check the return is `SMAP' + jne bail820 # fall to e801 if it fails + +# cmpl $1, 16(%di) # is this usable memory? +# jne again820 + + # If this is usable memory, we save it by simply advancing %di by + # sizeof(e820rec). + # +good820: + movb (E820NR), %al # up to 32 entries + cmpb $E820MAX, %al + jnl bail820 + + incb (E820NR) + movw %di, %ax + addw $20, %ax + movw %ax, %di +again820: + cmpl $0, %ebx # check to see if + jne jmpe820 # %ebx is set to EOF +bail820: + + +# method E801H: +# memory size is in 1k chunksizes, to avoid confusing loadlin. +# we store the 0xe801 memory size in a completely different place, +# because it will most likely be longer than 16 bits. +# (use 1e0 because that's what Larry Augustine uses in his +# alternative new memory detection scheme, and it's sensible +# to write everything into the same place.) + +meme801: + stc # fix to work around buggy + xorw %cx,%cx # BIOSes which dont clear/set + xorw %dx,%dx # carry on pass/error of + # e801h memory size call + # or merely pass cx,dx though + # without changing them. + movw $0xe801, %ax + int $0x15 + jc mem88 + + cmpw $0x0, %cx # Kludge to handle BIOSes + jne e801usecxdx # which report their extended + cmpw $0x0, %dx # memory in AX/BX rather than + jne e801usecxdx # CX/DX. The spec I have read + movw %ax, %cx # seems to indicate AX/BX + movw %bx, %dx # are more reasonable anyway... + +e801usecxdx: + andl $0xffff, %edx # clear sign extend + shll $6, %edx # and go from 64k to 1k chunks + movl %edx, (0x1e0) # store extended memory size + andl $0xffff, %ecx # clear sign extend + addl %ecx, (0x1e0) # and add lower memory into + # total size. + +# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or +# 64mb, depending on the bios) in ax. +mem88: + +#endif + movb $0x88, %ah + int $0x15 + movw %ax, (2) + +# Set the keyboard repeat rate to the max + movw $0x0305, %ax + xorw %bx, %bx + int $0x16 + +# Check for video adapter and its parameters and allow the +# user to browse video modes. + call video # NOTE: we need %ds pointing + # to bootsector + +# Get hd0 data... + xorw %ax, %ax + movw %ax, %ds + ldsw (4 * 0x41), %si + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + pushw %ax + movw %ax, %es + movw $0x0080, %di + movw $0x10, %cx + pushw %cx + cld + rep + movsb +# Get hd1 data... + xorw %ax, %ax + movw %ax, %ds + ldsw (4 * 0x46), %si + popw %cx + popw %es + movw $0x0090, %di + rep + movsb +# Check that there IS a hd1 :-) + movw $0x01500, %ax + movb $0x81, %dl + int $0x13 + jc no_disk1 + + cmpb $3, %ah + je is_disk1 + +no_disk1: + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ax, %es + movw $0x0090, %di + movw $0x10, %cx + xorw %ax, %ax + cld + rep + stosb +is_disk1: +# check for Micro Channel (MCA) bus + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ax, %ds + xorw %ax, %ax + movw %ax, (0xa0) # set table length to 0 + movb $0xc0, %ah + stc + int $0x15 # moves feature table to es:bx + jc no_mca + + pushw %ds + movw %es, %ax + movw %ax, %ds + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ax, %es + movw %bx, %si + movw $0xa0, %di + movw (%si), %cx + addw $2, %cx # table length is a short + cmpw $0x10, %cx + jc sysdesc_ok + + movw $0x10, %cx # we keep only first 16 bytes +sysdesc_ok: + rep + movsb + popw %ds +no_mca: +#ifdef CONFIG_X86_VOYAGER + movb $0xff, 0x40 # flag on config found + movb $0xc0, %al + mov $0xff, %ah + int $0x15 # put voyager config info at es:di + jc no_voyager + movw $0x40, %si # place voyager info in apm table + cld + movw $7, %cx +voyager_rep: + movb %es:(%di), %al + movb %al,(%si) + incw %di + incw %si + decw %cx + jnz voyager_rep +no_voyager: +#endif +# Check for PS/2 pointing device + movw %cs, %ax # aka SETUPSEG + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ax, %ds + movw $0, (0x1ff) # default is no pointing device + int $0x11 # int 0x11: equipment list + testb $0x04, %al # check if mouse installed + jz no_psmouse + + movw $0xAA, (0x1ff) # device present +no_psmouse: + +#if defined(CONFIG_X86_SPEEDSTEP_SMI) || defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) + movl $0x0000E980, %eax # IST Support + movl $0x47534943, %edx # Request value + int $0x15 + + movl %eax, (96) + movl %ebx, (100) + movl %ecx, (104) + movl %edx, (108) +#endif + +#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE) +# Then check for an APM BIOS... + # %ds points to the bootsector + movw $0, 0x40 # version = 0 means no APM BIOS + movw $0x05300, %ax # APM BIOS installation check + xorw %bx, %bx + int $0x15 + jc done_apm_bios # Nope, no APM BIOS + + cmpw $0x0504d, %bx # Check for "PM" signature + jne done_apm_bios # No signature, no APM BIOS + + andw $0x02, %cx # Is 32 bit supported? + je done_apm_bios # No 32-bit, no (good) APM BIOS + + movw $0x05304, %ax # Disconnect first just in case + xorw %bx, %bx + int $0x15 # ignore return code + movw $0x05303, %ax # 32 bit connect + xorl %ebx, %ebx + xorw %cx, %cx # paranoia :-) + xorw %dx, %dx # ... + xorl %esi, %esi # ... + xorw %di, %di # ... + int $0x15 + jc no_32_apm_bios # Ack, error. + + movw %ax, (66) # BIOS code segment + movl %ebx, (68) # BIOS entry point offset + movw %cx, (72) # BIOS 16 bit code segment + movw %dx, (74) # BIOS data segment + movl %esi, (78) # BIOS code segment lengths + movw %di, (82) # BIOS data segment length +# Redo the installation check as the 32 bit connect +# modifies the flags returned on some BIOSs + movw $0x05300, %ax # APM BIOS installation check + xorw %bx, %bx + xorw %cx, %cx # paranoia + int $0x15 + jc apm_disconnect # error -> shouldn't happen + + cmpw $0x0504d, %bx # check for "PM" signature + jne apm_disconnect # no sig -> shouldn't happen + + movw %ax, (64) # record the APM BIOS version + movw %cx, (76) # and flags + jmp done_apm_bios + +apm_disconnect: # Tidy up + movw $0x05304, %ax # Disconnect + xorw %bx, %bx + int $0x15 # ignore return code + + jmp done_apm_bios + +no_32_apm_bios: + andw $0xfffd, (76) # remove 32 bit support bit +done_apm_bios: +#endif + +#include "edd.S" + +# Now we want to move to protected mode ... + cmpw $0, %cs:realmode_swtch + jz rmodeswtch_normal + + lcall *%cs:realmode_swtch + + jmp rmodeswtch_end + +rmodeswtch_normal: + pushw %cs + call default_switch + +rmodeswtch_end: +# we get the code32 start address and modify the below 'jmpi' +# (loader may have changed it) + movl %cs:code32_start, %eax + movl %eax, %cs:code32 + +# Now we move the system to its rightful place ... but we check if we have a +# big-kernel. In that case we *must* not move it ... + testb $LOADED_HIGH, %cs:loadflags + jz do_move0 # .. then we have a normal low + # loaded zImage + # .. or else we have a high + # loaded bzImage + jmp end_move # ... and we skip moving + +do_move0: + movw $0x100, %ax # start of destination segment + movw %cs, %bp # aka SETUPSEG + subw $DELTA_INITSEG, %bp # aka INITSEG + movw %cs:start_sys_seg, %bx # start of source segment + cld +do_move: + movw %ax, %es # destination segment + incb %ah # instead of add ax,#0x100 + movw %bx, %ds # source segment + addw $0x100, %bx + subw %di, %di + subw %si, %si + movw $0x800, %cx + rep + movsw + cmpw %bp, %bx # assume start_sys_seg > 0x200, + # so we will perhaps read one + # page more than needed, but + # never overwrite INITSEG + # because destination is a + # minimum one page below source + jb do_move + +end_move: +# then we load the segment descriptors + movw %cs, %ax # aka SETUPSEG + movw %ax, %ds + +# Check whether we need to be downward compatible with version <=201 + cmpl $0, cmd_line_ptr + jne end_move_self # loader uses version >=202 features + cmpb $0x20, type_of_loader + je end_move_self # bootsect loader, we know of it + +# Boot loader doesnt support boot protocol version 2.02. +# If we have our code not at 0x90000, we need to move it there now. +# We also then need to move the params behind it (commandline) +# Because we would overwrite the code on the current IP, we move +# it in two steps, jumping high after the first one. + movw %cs, %ax + cmpw $SETUPSEG, %ax + je end_move_self + + cli # make sure we really have + # interrupts disabled ! + # because after this the stack + # should not be used + subw $DELTA_INITSEG, %ax # aka INITSEG + movw %ss, %dx + cmpw %ax, %dx + jb move_self_1 + + addw $INITSEG, %dx + subw %ax, %dx # this will go into %ss after + # the move +move_self_1: + movw %ax, %ds + movw $INITSEG, %ax # real INITSEG + movw %ax, %es + movw %cs:setup_move_size, %cx + std # we have to move up, so we use + # direction down because the + # areas may overlap + movw %cx, %di + decw %di + movw %di, %si + subw $move_self_here+0x200, %cx + rep + movsb + ljmp $SETUPSEG, $move_self_here + +move_self_here: + movw $move_self_here+0x200, %cx + rep + movsb + movw $SETUPSEG, %ax + movw %ax, %ds + movw %dx, %ss +end_move_self: # now we are at the right place + +# +# Enable A20. This is at the very best an annoying procedure. +# A20 code ported from SYSLINUX 1.52-1.63 by H. Peter Anvin. +# AMD Elan bug fix by Robert Schwebel. +# + +#if defined(CONFIG_X86_ELAN) + movb $0x02, %al # alternate A20 gate + outb %al, $0x92 # this works on SC410/SC520 +a20_elan_wait: + call a20_test + jz a20_elan_wait + jmp a20_done +#endif + + +A20_TEST_LOOPS = 32 # Iterations per wait +A20_ENABLE_LOOPS = 255 # Total loops to try + + +#ifndef CONFIG_X86_VOYAGER +a20_try_loop: + + # First, see if we are on a system with no A20 gate. +a20_none: + call a20_test + jnz a20_done + + # Next, try the BIOS (INT 0x15, AX=0x2401) +a20_bios: + movw $0x2401, %ax + pushfl # Be paranoid about flags + int $0x15 + popfl + + call a20_test + jnz a20_done + + # Try enabling A20 through the keyboard controller +#endif /* CONFIG_X86_VOYAGER */ +a20_kbc: + call empty_8042 + +#ifndef CONFIG_X86_VOYAGER + call a20_test # Just in case the BIOS worked + jnz a20_done # but had a delayed reaction. +#endif + + movb $0xD1, %al # command write + outb %al, $0x64 + call empty_8042 + + movb $0xDF, %al # A20 on + outb %al, $0x60 + call empty_8042 + +#ifndef CONFIG_X86_VOYAGER + # Wait until a20 really *is* enabled; it can take a fair amount of + # time on certain systems; Toshiba Tecras are known to have this + # problem. +a20_kbc_wait: + xorw %cx, %cx +a20_kbc_wait_loop: + call a20_test + jnz a20_done + loop a20_kbc_wait_loop + + # Final attempt: use "configuration port A" +a20_fast: + inb $0x92, %al # Configuration Port A + orb $0x02, %al # "fast A20" version + andb $0xFE, %al # don't accidentally reset + outb %al, $0x92 + + # Wait for configuration port A to take effect +a20_fast_wait: + xorw %cx, %cx +a20_fast_wait_loop: + call a20_test + jnz a20_done + loop a20_fast_wait_loop + + # A20 is still not responding. Try frobbing it again. + # + decb (a20_tries) + jnz a20_try_loop + + movw $a20_err_msg, %si + call prtstr + +a20_die: + hlt + jmp a20_die + +a20_tries: + .byte A20_ENABLE_LOOPS + +a20_err_msg: + .ascii "linux: fatal error: A20 gate not responding!" + .byte 13, 10, 0 + + # If we get here, all is good +a20_done: + +#endif /* CONFIG_X86_VOYAGER */ +# set up gdt and idt + lidt idt_48 # load idt with 0,0 + xorl %eax, %eax # Compute gdt_base + movw %ds, %ax # (Convert %ds:gdt to a linear ptr) + shll $4, %eax + addl $gdt, %eax + movl %eax, (gdt_48+2) + lgdt gdt_48 # load gdt with whatever is + # appropriate + +# make sure any possible coprocessor is properly reset.. + xorw %ax, %ax + outb %al, $0xf0 + call delay + + outb %al, $0xf1 + call delay + +# well, that went ok, I hope. Now we mask all interrupts - the rest +# is done in init_IRQ(). + movb $0xFF, %al # mask all interrupts for now + outb %al, $0xA1 + call delay + + movb $0xFB, %al # mask all irq's but irq2 which + outb %al, $0x21 # is cascaded + +# Well, that certainly wasn't fun :-(. Hopefully it works, and we don't +# need no steenking BIOS anyway (except for the initial loading :-). +# The BIOS-routine wants lots of unnecessary data, and it's less +# "interesting" anyway. This is how REAL programmers do it. +# +# Well, now's the time to actually move into protected mode. To make +# things as simple as possible, we do no register set-up or anything, +# we let the gnu-compiled 32-bit programs do that. We just jump to +# absolute address 0x1000 (or the loader supplied one), +# in 32-bit protected mode. +# +# Note that the short jump isn't strictly needed, although there are +# reasons why it might be a good idea. It won't hurt in any case. + movw $1, %ax # protected mode (PE) bit + lmsw %ax # This is it! + jmp flush_instr + +flush_instr: + xorw %bx, %bx # Flag to indicate a boot + xorl %esi, %esi # Pointer to real-mode code + movw %cs, %si + subw $DELTA_INITSEG, %si + shll $4, %esi # Convert to 32-bit pointer + +# jump to startup_32 in arch/i386/boot/compressed/head.S +# +# NOTE: For high loaded big kernels we need a +# jmpi 0x100000,__BOOT_CS +# +# but we yet haven't reloaded the CS register, so the default size +# of the target offset still is 16 bit. +# However, using an operand prefix (0x66), the CPU will properly +# take our 48 bit far pointer. (INTeL 80386 Programmer's Reference +# Manual, Mixing 16-bit and 32-bit code, page 16-6) + + .byte 0x66, 0xea # prefix + jmpi-opcode +code32: .long 0x1000 # will be set to 0x100000 + # for big kernels + .word __BOOT_CS + +# Here's a bunch of information about your current kernel.. +kernel_version: .ascii UTS_RELEASE + .ascii " (" + .ascii LINUX_COMPILE_BY + .ascii "@" + .ascii LINUX_COMPILE_HOST + .ascii ") " + .ascii UTS_VERSION + .byte 0 + +# This is the default real mode switch routine. +# to be called just before protected mode transition +default_switch: + cli # no interrupts allowed ! + movb $0x80, %al # disable NMI for bootup + # sequence + outb %al, $0x70 + lret + + +#ifndef CONFIG_X86_VOYAGER +# This routine tests whether or not A20 is enabled. If so, it +# exits with zf = 0. +# +# The memory address used, 0x200, is the int $0x80 vector, which +# should be safe. + +A20_TEST_ADDR = 4*0x80 + +a20_test: + pushw %cx + pushw %ax + xorw %cx, %cx + movw %cx, %fs # Low memory + decw %cx + movw %cx, %gs # High memory area + movw $A20_TEST_LOOPS, %cx + movw %fs:(A20_TEST_ADDR), %ax + pushw %ax +a20_test_wait: + incw %ax + movw %ax, %fs:(A20_TEST_ADDR) + call delay # Serialize and make delay constant + cmpw %gs:(A20_TEST_ADDR+0x10), %ax + loope a20_test_wait + + popw %fs:(A20_TEST_ADDR) + popw %ax + popw %cx + ret + +#endif /* CONFIG_X86_VOYAGER */ + +# This routine checks that the keyboard command queue is empty +# (after emptying the output buffers) +# +# Some machines have delusions that the keyboard buffer is always full +# with no keyboard attached... +# +# If there is no keyboard controller, we will usually get 0xff +# to all the reads. With each IO taking a microsecond and +# a timeout of 100,000 iterations, this can take about half a +# second ("delay" == outb to port 0x80). That should be ok, +# and should also be plenty of time for a real keyboard controller +# to empty. +# + +empty_8042: + pushl %ecx + movl $100000, %ecx + +empty_8042_loop: + decl %ecx + jz empty_8042_end_loop + + call delay + + inb $0x64, %al # 8042 status port + testb $1, %al # output buffer? + jz no_output + + call delay + inb $0x60, %al # read it + jmp empty_8042_loop + +no_output: + testb $2, %al # is input buffer full? + jnz empty_8042_loop # yes - loop +empty_8042_end_loop: + popl %ecx + ret + +# Read the cmos clock. Return the seconds in al +gettime: + pushw %cx + movb $0x02, %ah + int $0x1a + movb %dh, %al # %dh contains the seconds + andb $0x0f, %al + movb %dh, %ah + movb $0x04, %cl + shrb %cl, %ah + aad + popw %cx + ret + +# Delay is needed after doing I/O +delay: + outb %al,$0x80 + ret + +# Descriptor tables +# +# NOTE: The intel manual says gdt should be sixteen bytes aligned for +# efficiency reasons. However, there are machines which are known not +# to boot with misaligned GDTs, so alter this at your peril! If you alter +# GDT_ENTRY_BOOT_CS (in asm/segment.h) remember to leave at least two +# empty GDT entries (one for NULL and one reserved). +# +# NOTE: On some CPUs, the GDT must be 8 byte aligned. This is +# true for the Voyager Quad CPU card which will not boot without +# This directive. 16 byte aligment is recommended by intel. +# + .align 16 +gdt: + .fill GDT_ENTRY_BOOT_CS,8,0 + + .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb) + .word 0 # base address = 0 + .word 0x9A00 # code read/exec + .word 0x00CF # granularity = 4096, 386 + # (+5th nibble of limit) + + .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb) + .word 0 # base address = 0 + .word 0x9200 # data read/write + .word 0x00CF # granularity = 4096, 386 + # (+5th nibble of limit) +gdt_end: + .align 4 + + .word 0 # alignment byte +idt_48: + .word 0 # idt limit = 0 + .word 0, 0 # idt base = 0L + + .word 0 # alignment byte +gdt_48: + .word gdt_end - gdt - 1 # gdt limit + .word 0, 0 # gdt base (filled in later) + +# Include video setup & detection code + +#include "video.S" + +# Setup signature -- must be last +setup_sig1: .word SIG1 +setup_sig2: .word SIG2 + +# After this point, there is some free space which is used by the video mode +# handling code to store the temporary mode table (not used by the kernel). + +modelist: + +.text +endtext: +.data +enddata: +.bss +endbss: |