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parisc: Add kgdb io_module to read chars via PDC 

Add a simplistic keyboard driver for usage of PDC I/O functions
with kgdb. This driver makes it possible to use KGDB with QEMU.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2022-01-05 22:44:12 +01:00
parent 712a270d2d
commit c1c72d9bbf
1 changed files with 21 additions and 0 deletions
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21
arch/parisc/kernel/kgdb.c
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@ -3,6 +3,7 @@
* PA-RISC KGDB support
*
* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
* Copyright (c) 2022 Helge Deller <deller@gmx.de>
*
*/
@ -207,3 +208,23 @@ int kgdb_arch_handle_exception(int trap, int signo,
}
return -1;
}
/* KGDB console driver which uses PDC to read chars from keyboard */
static void kgdb_pdc_write_char(u8 chr)
{
/* no need to print char. kgdb will do it. */
}
static struct kgdb_io kgdb_pdc_io_ops = {
.name = "kgdb_pdc",
.read_char = pdc_iodc_getc,
.write_char = kgdb_pdc_write_char,
};
static int __init kgdb_pdc_init(void)
{
kgdb_register_io_module(&kgdb_pdc_io_ops);
return 0;
}
early_initcall(kgdb_pdc_init);