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# 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
#
# 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
#include "migration-test.h"
#define ACPI_ENABLE 0xf1
#define ACPI_PORT_SMI_CMD 0xb2
#define ACPI_PM_BASE 0x600
#define PM1A_CNT_OFFSET 4
#define ACPI_SCI_ENABLE 0x0001
#define ACPI_SLEEP_TYPE 0x0400
#define ACPI_SLEEP_ENABLE 0x2000
#define SLEEP (ACPI_SCI_ENABLE + ACPI_SLEEP_TYPE + ACPI_SLEEP_ENABLE)
#define LOW_ADDR X86_TEST_MEM_START
#define HIGH_ADDR X86_TEST_MEM_END
/* Save the suspended status at an address that is not written in the loop. */
#define suspended (X86_TEST_MEM_START + 4)
.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
# Start from 1MB
.set TEST_MEM_START, X86_TEST_MEM_START
.set TEST_MEM_END, X86_TEST_MEM_END
mov $65,%ax
mov $0x3f8,%dx
outb %al,%dx
# bl keeps a counter so we limit the output speed
mov $0, %bl
pre_zero:
mov $TEST_MEM_START,%eax
do_zero:
movb $0, (%eax)
add $4096,%eax
cmp $TEST_MEM_END,%eax
jl do_zero
mainloop:
mov $TEST_MEM_START,%eax
innerloop:
incb (%eax)
add $4096,%eax
cmp $TEST_MEM_END,%eax
jl innerloop
inc %bl
andb $0x3f,%bl
jnz mainloop
mov $66,%ax
mov $0x3f8,%dx
outb %al,%dx
# should this test suspend?
mov (suspend_me),%eax
cmp $0,%eax
je mainloop
# are we waking after suspend? do not suspend again.
mov $suspended,%eax
mov (%eax),%eax
cmp $1,%eax
je mainloop
# enable acpi
mov $ACPI_ENABLE,%al
outb %al,$ACPI_PORT_SMI_CMD
# suspend to ram
mov $suspended,%eax
movl $1,(%eax)
mov $SLEEP,%ax
mov $(ACPI_PM_BASE + PM1A_CNT_OFFSET),%dx
outw %ax,%dx
# not reached. The wakeup causes reset and restart at 0x7c00, and we
# do not save and restore registers as a real kernel would do.
# 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 */
/* test launcher can poke a 1 here to exercise suspend */
suspend_me:
.int 0
/* I'm a bootable disk */
.org 0x7dfe
.byte 0x55
.byte 0xAA
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