17ca7746d7
The boot block used in the migration test is currently only
shipped as a hex (with the source in the git commit message of ea0c6d62),
change this to actually include the source.
A script is added to rebuild the header but the expectation is that
the generated hex is shipped as well as the .s, so that
there's no requirement to have just the right assembler etc.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180213100606.5379-1-dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Removed blank line at end of script
93 lines
2.3 KiB
ArmAsm
93 lines
2.3 KiB
ArmAsm
# x86 bootblock used in migration test
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# repeatedly increments the first byte of each page in a 100MB
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# range.
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# Outputs an initial 'A' on serial followed by repeated 'B's
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#
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# run tests/migration/rebuild-x86-bootblock.sh
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# to regenerate the hex, and remember to include both the .h and .s
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# in any patches.
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#
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# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
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# This work is licensed under the terms of the GNU GPL, version 2 or later.
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# See the COPYING file in the top-level directory.
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#
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# Author: dgilbert@redhat.com
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.code16
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.org 0x7c00
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.file "fill.s"
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.text
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.globl start
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.type start, @function
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start: # at 0x7c00 ?
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cli
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lgdt gdtdesc
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mov $1,%eax
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mov %eax,%cr0 # Protected mode enable
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data32 ljmp $8,$0x7c20
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.org 0x7c20
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.code32
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# A20 enable - not sure I actually need this
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inb $0x92,%al
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or $2,%al
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outb %al, $0x92
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# set up DS for the whole of RAM (needed on KVM)
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mov $16,%eax
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mov %eax,%ds
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mov $65,%ax
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mov $0x3f8,%dx
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outb %al,%dx
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# bl keeps a counter so we limit the output speed
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mov $0, %bl
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mainloop:
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# Start from 1MB
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mov $(1024*1024),%eax
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innerloop:
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incb (%eax)
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add $4096,%eax
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cmp $(100*1024*1024),%eax
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jl innerloop
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inc %bl
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jnz mainloop
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mov $66,%ax
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mov $0x3f8,%dx
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outb %al,%dx
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jmp mainloop
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# GDT magic from old (GPLv2) Grub startup.S
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.p2align 2 /* force 4-byte alignment */
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gdt:
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.word 0, 0
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.byte 0, 0, 0, 0
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/* -- code segment --
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* base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
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* type = 32bit code execute/read, DPL = 0
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*/
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.word 0xFFFF, 0
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.byte 0, 0x9A, 0xCF, 0
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/* -- data segment --
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* base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
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* type = 32 bit data read/write, DPL = 0
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*/
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.word 0xFFFF, 0
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.byte 0, 0x92, 0xCF, 0
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gdtdesc:
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.word 0x27 /* limit */
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.long gdt /* addr */
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/* I'm a bootable disk */
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.org 0x7dfe
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.byte 0x55
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.byte 0xAA
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