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efi_loader: split out escape sequence based size query

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We need to do something different for vidconsole, since it cannot
respond to the query on stdin.  Prep work for next patch.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Rob Clark 2017-09-13 18:05:42 -04:00 • committed by Alexander Graf
parent 778e6af8a6
commit 71cc25c35c
1 changed files with 30 additions and 23 deletions
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53
lib/efi_loader/efi_console.c
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@ -186,6 +186,34 @@ static bool cout_mode_matches(struct cout_mode *mode, int rows, int cols)
return (mode->rows == rows) && (mode->columns == cols);
}
static int query_console_serial(int *rows, int *cols)
{
/* Ask the terminal about its size */
int n[3];
u64 timeout;
/* Empty input buffer */
while (tstc())
getc();
printf(ESC"[18t");
/* Check if we have a terminal that understands */
timeout = timer_get_us() + 1000000;
while (!tstc())
if (timer_get_us() > timeout)
return -1;
/* Read {depth,rows,cols} */
if (term_read_reply(n, 3, 't'))
return -1;
*cols = n[2];
*rows = n[1];
return 0;
}
static efi_status_t EFIAPI efi_cout_query_mode(
struct efi_simple_text_output_protocol *this,
unsigned long mode_number, unsigned long *columns,
@ -194,33 +222,12 @@ static efi_status_t EFIAPI efi_cout_query_mode(
EFI_ENTRY("%p, %ld, %p, %p", this, mode_number, columns, rows);
if (!console_size_queried) {
/* Ask the terminal about its size */
int n[3];
int cols;
int rows;
u64 timeout;
int rows, cols;
console_size_queried = true;
/* Empty input buffer */
while (tstc())
getc();
printf(ESC"[18t");
/* Check if we have a terminal that understands */
timeout = timer_get_us() + 1000000;
while (!tstc())
if (timer_get_us() > timeout)
goto out;
/* Read {depth,rows,cols} */
if (term_read_reply(n, 3, 't')) {
if (query_console_serial(&rows, &cols))
goto out;
}
cols = n[2];
rows = n[1];
/* Test if we can have Mode 1 */
if (cols >= 80 && rows >= 50) {