| # |
| # Copyright (c) 2018 Red Hat, Inc. and/or its affiliates |
| # |
| # Author: |
| # Wei Huang <wei@redhat.com> |
| # |
| # This work is licensed under the terms of the GNU GPL, version 2 or later. |
| # See the COPYING file in the top-level directory. |
| # |
| # Note: Please make sure the compiler compiles the assembly code below with |
| # pc-relative address. Also the branch instructions should use relative |
| # addresses only. |
| |
| #include "../migration-test.h" |
| |
| .section .text |
| |
| .globl _start |
| |
| _start: |
| /* disable MMU to use phys mem address */ |
| mrs x0, sctlr_el1 |
| bic x0, x0, #(1<<0) |
| msr sctlr_el1, x0 |
| isb |
| |
| /* traverse test memory region */ |
| mov x0, #ARM_TEST_MEM_START |
| mov x1, #ARM_TEST_MEM_END |
| |
| /* output char 'A' to PL011 */ |
| mov w3, 'A' |
| mov x2, #ARM_MACH_VIRT_UART |
| strb w3, [x2] |
| |
| /* clean up memory */ |
| mov w3, #0 |
| mov x4, x0 |
| clean: |
| strb w3, [x4] |
| add x4, x4, #TEST_MEM_PAGE_SIZE |
| cmp x4, x1 |
| ble clean |
| |
| /* w5 keeps a counter so we can limit the output speed */ |
| mov w5, #0 |
| |
| /* main body */ |
| mainloop: |
| mov x4, x0 |
| |
| innerloop: |
| /* increment the first byte of each page by 1 */ |
| ldrb w3, [x4] |
| add w3, w3, #1 |
| and w3, w3, #0xff |
| strb w3, [x4] |
| |
| /* make sure QEMU user space can see consistent data as MMU is off */ |
| dc civac, x4 |
| |
| add x4, x4, #TEST_MEM_PAGE_SIZE |
| cmp x4, x1 |
| blt innerloop |
| |
| add w5, w5, #1 |
| and w5, w5, #0xff |
| cmp w5, #0 |
| bne mainloop |
| |
| /* output char 'B' to PL011 */ |
| mov w3, 'B' |
| strb w3, [x2] |
| |
| b mainloop |
