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Make pc86 echo console output to the serial port, so qemu can pipe it to

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stdout.
This commit is contained in:
David Given 2016-11-25 20:28:41 +01:00
parent ed181a8d20
commit bfa8e501a3
2 changed files with 12 additions and 0 deletions
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3
plat/pc86/README
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@ -23,6 +23,9 @@ are stubs required to make the demo apps link. File descriptors 0, 1 and 2
represent the console. All reads block. There's enough TTY emulation to allow represent the console. All reads block. There's enough TTY emulation to allow
\n conversion and local echo (but it can't be turned off). \n conversion and local echo (but it can't be turned off).
Console output is echoed to the serial port (without any setup). This is used
by qemu for running tests.
Example command line Example command line
==================== ====================

9
plat/pc86/libsys/_sys_rawwrite.s
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@ -21,9 +21,18 @@ __sys_rawwrite:
push bp push bp
mov bp, sp mov bp, sp
! Write to the BIOS console.
movb al, 4(bp) movb al, 4(bp)
movb ah, 0x0E movb ah, 0x0E
mov bx, 0x0007 mov bx, 0x0007
int 0x10 int 0x10
! Also write to the serial port (used by the test suite).
movb ah, 0x01
xor dx, dx
int 0x14
jmp .cret jmp .cret