From: David Esler <drumandst...@gmail.com>
In 9180f5365524 a change was made to the send_chr function to take in
C-strings and print out a character at a time until a NULL was
encountered. However there is no code to increment the current character
position resulting in an endless loop of the first character. This adds
a simple increment.
Reviewed-by: Doug Goldstein <car...@cardoe.com>
Signed-off-by: David Esler <drumandst...@gmail.com>
---
xen/arch/x86/boot/head.S | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index fd6fc337fe..9cc35da558 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -173,10 +173,11 @@ not_multiboot:
.Lget_vtb:
mov sym_esi(vga_text_buffer),%edi
.Lsend_chr:
- mov (%esi),%bl
- test %bl,%bl # Terminate on '\0' sentinel
+ lodsb
+ test %al,%al # Terminate on '\0' sentinel
je .Lhalt
mov $0x3f8+5,%dx # UART Line Status Register
+ mov %al,%bl
2: in %dx,%al
test $0x20,%al # Test THR Empty flag
je 2b
@@ -185,7 +186,7 @@ not_multiboot:
out %al,%dx # Send a character over the serial line
test %edi,%edi # Is the VGA text buffer available?
jz .Lsend_chr
- movsb # Write a character to the VGA text buffer
+ stosb # Write a character to the VGA text buffer
mov $7,%al
stosb # Write an attribute to the VGA text buffer
jmp .Lsend_chr
--
2.13.5
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