93 lines
2.3 KiB
ArmAsm
93 lines
2.3 KiB
ArmAsm
|
# x86 bootblock used in migration test
|
||
|
|
# repeatedly increments the first byte of each page in a 100MB
|
||
|
|
# range.
|
||
|
|
# Outputs an initial 'A' on serial followed by repeated 'B's
|
||
|
|
#
|
||
|
|
# run tests/migration/rebuild-x86-bootblock.sh
|
||
|
|
# to regenerate the hex, and remember to include both the .h and .s
|
||
|
|
# in any patches.
|
||
|
|
#
|
||
|
|
# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
|
||
|
|
# This work is licensed under the terms of the GNU GPL, version 2 or later.
|
||
|
|
# See the COPYING file in the top-level directory.
|
||
|
|
#
|
||
|
|
# Author: dgilbert@redhat.com
|
||
|
|
|
||
|
|
|
||
|
|
.code16
|
||
|
|
.org 0x7c00
|
||
|
|
.file "fill.s"
|
||
|
|
.text
|
||
|
|
.globl start
|
||
|
|
.type start, @function
|
||
|
|
start: # at 0x7c00 ?
|
||
|
|
cli
|
||
|
|
lgdt gdtdesc
|
||
|
|
mov $1,%eax
|
||
|
|
mov %eax,%cr0 # Protected mode enable
|
||
|
|
data32 ljmp $8,$0x7c20
|
||
|
|
|
||
|
|
.org 0x7c20
|
||
|
|
.code32
|
||
|
|
# A20 enable - not sure I actually need this
|
||
|
|
inb $0x92,%al
|
||
|
|
or $2,%al
|
||
|
|
outb %al, $0x92
|
||
|
|
|
||
|
|
# set up DS for the whole of RAM (needed on KVM)
|
||
|
|
mov $16,%eax
|
||
|
|
mov %eax,%ds
|
||
|
|
|
||
|
|
mov $65,%ax
|
||
|
|
mov $0x3f8,%dx
|
||
|
|
outb %al,%dx
|
||
|
|
|
||
|
|
# bl keeps a counter so we limit the output speed
|
||
|
|
mov $0, %bl
|
||
|
|
mainloop:
|
||
|
|
# Start from 1MB
|
||
|
|
mov $(1024*1024),%eax
|
||
|
|
innerloop:
|
||
|
|
incb (%eax)
|
||
|
|
add $4096,%eax
|
||
|
|
cmp $(100*1024*1024),%eax
|
||
|
|
jl innerloop
|
||
|
|
|
||
|
|
inc %bl
|
||
|
|
jnz mainloop
|
||
|
|
|
||
|
|
mov $66,%ax
|
||
|
|
mov $0x3f8,%dx
|
||
|
|
outb %al,%dx
|
||
|
|
|
||
|
|
jmp mainloop
|
||
|
|
|
||
|
|
# GDT magic from old (GPLv2) Grub startup.S
|
||
|
|
.p2align 2 /* force 4-byte alignment */
|
||
|
|
gdt:
|
||
|
|
.word 0, 0
|
||
|
|
.byte 0, 0, 0, 0
|
||
|
|
|
||
|
|
/* -- code segment --
|
||
|
|
* base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
|
||
|
|
* type = 32bit code execute/read, DPL = 0
|
||
|
|
*/
|
||
|
|
.word 0xFFFF, 0
|
||
|
|
.byte 0, 0x9A, 0xCF, 0
|
||
|
|
|
||
|
|
/* -- data segment --
|
||
|
|
* base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
|
||
|
|
* type = 32 bit data read/write, DPL = 0
|
||
|
|
*/
|
||
|
|
.word 0xFFFF, 0
|
||
|
|
.byte 0, 0x92, 0xCF, 0
|
||
|
|
|
||
|
|
gdtdesc:
|
||
|
|
.word 0x27 /* limit */
|
||
|
|
.long gdt /* addr */
|
||
|
|
|
||
|
|
/* I'm a bootable disk */
|
||
|
|
.org 0x7dfe
|
||
|
|
.byte 0x55
|
||
|
|
.byte 0xAA
|