1# x86 bootblock used in migration test 2# repeatedly increments the first byte of each page in a 100MB 3# range. 4# Outputs an initial 'A' on serial followed by repeated 'B's 5# 6# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates 7# This work is licensed under the terms of the GNU GPL, version 2 or later. 8# See the COPYING file in the top-level directory. 9# 10# Author: dgilbert@redhat.com 11 12#include "migration-test.h" 13 14#define ACPI_ENABLE 0xf1 15#define ACPI_PORT_SMI_CMD 0xb2 16#define ACPI_PM_BASE 0x600 17#define PM1A_CNT_OFFSET 4 18 19#define ACPI_SCI_ENABLE 0x0001 20#define ACPI_SLEEP_TYPE 0x0400 21#define ACPI_SLEEP_ENABLE 0x2000 22#define SLEEP (ACPI_SCI_ENABLE + ACPI_SLEEP_TYPE + ACPI_SLEEP_ENABLE) 23 24#define LOW_ADDR X86_TEST_MEM_START 25#define HIGH_ADDR X86_TEST_MEM_END 26 27/* Save the suspended status at an address that is not written in the loop. */ 28#define suspended (X86_TEST_MEM_START + 4) 29 30.code16 31.org 0x7c00 32 .file "fill.s" 33 .text 34 .globl start 35 .type start, @function 36start: # at 0x7c00 ? 37 cli 38 lgdt gdtdesc 39 mov $1,%eax 40 mov %eax,%cr0 # Protected mode enable 41 data32 ljmp $8,$0x7c20 42 43.org 0x7c20 44.code32 45 # A20 enable - not sure I actually need this 46 inb $0x92,%al 47 or $2,%al 48 outb %al, $0x92 49 50 # set up DS for the whole of RAM (needed on KVM) 51 mov $16,%eax 52 mov %eax,%ds 53 54# Start from 1MB 55.set TEST_MEM_START, X86_TEST_MEM_START 56.set TEST_MEM_END, X86_TEST_MEM_END 57 58 mov $65,%ax 59 mov $0x3f8,%dx 60 outb %al,%dx 61 62 # bl keeps a counter so we limit the output speed 63 mov $0, %bl 64 65pre_zero: 66 mov $TEST_MEM_START,%eax 67do_zero: 68 movb $0, (%eax) 69 add $4096,%eax 70 cmp $TEST_MEM_END,%eax 71 jl do_zero 72 73mainloop: 74 mov $TEST_MEM_START,%eax 75innerloop: 76 incb (%eax) 77 add $4096,%eax 78 cmp $TEST_MEM_END,%eax 79 jl innerloop 80 81 inc %bl 82 andb $0x3f,%bl 83 jnz mainloop 84 85 mov $66,%ax 86 mov $0x3f8,%dx 87 outb %al,%dx 88 89 # should this test suspend? 90 mov (suspend_me),%eax 91 cmp $0,%eax 92 je mainloop 93 94 # are we waking after suspend? do not suspend again. 95 mov $suspended,%eax 96 mov (%eax),%eax 97 cmp $1,%eax 98 je mainloop 99 100 # enable acpi 101 mov $ACPI_ENABLE,%al 102 outb %al,$ACPI_PORT_SMI_CMD 103 104 # suspend to ram 105 mov $suspended,%eax 106 movl $1,(%eax) 107 mov $SLEEP,%ax 108 mov $(ACPI_PM_BASE + PM1A_CNT_OFFSET),%dx 109 outw %ax,%dx 110 # not reached. The wakeup causes reset and restart at 0x7c00, and we 111 # do not save and restore registers as a real kernel would do. 112 113 114 # GDT magic from old (GPLv2) Grub startup.S 115 .p2align 2 /* force 4-byte alignment */ 116gdt: 117 .word 0, 0 118 .byte 0, 0, 0, 0 119 120 /* -- code segment -- 121 * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present 122 * type = 32bit code execute/read, DPL = 0 123 */ 124 .word 0xFFFF, 0 125 .byte 0, 0x9A, 0xCF, 0 126 127 /* -- data segment -- 128 * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present 129 * type = 32 bit data read/write, DPL = 0 130 */ 131 .word 0xFFFF, 0 132 .byte 0, 0x92, 0xCF, 0 133 134gdtdesc: 135 .word 0x27 /* limit */ 136 .long gdt /* addr */ 137 138 /* test launcher can poke a 1 here to exercise suspend */ 139suspend_me: 140 .int 0 141 142/* I'm a bootable disk */ 143.org 0x7dfe 144 .byte 0x55 145 .byte 0xAA 146