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Probe for existence of the bvm debug port instead of just assuming that it is

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always present.

Suggested by:	grehan
Obtained from:	NetApp
This commit is contained in:
Neel Natu 2012-10-27 22:54:23 +00:00
parent e365fca6c8
commit 1ea1e18490
1 changed files with 15 additions and 9 deletions
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24
sys/dev/bvm/bvm_dbg.c
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@ -49,6 +49,8 @@ GDB_DBGPORT(bvm, bvm_dbg_probe, bvm_dbg_init, bvm_dbg_term,
#define BVM_DBG_PORT 0x224
static int bvm_dbg_port = BVM_DBG_PORT;
#define BVM_DBG_SIG ('B' << 8 | 'V')
static int
bvm_dbg_probe(void)
{
@ -56,17 +58,21 @@ bvm_dbg_probe(void)
disabled = 0;
resource_int_value("bvmdbg", 0, "disabled", &disabled);
if (disabled)
return (-1);
if (resource_int_value("bvmdbg", 0, "port", &port) == 0)
bvm_dbg_port = port;
if (!disabled) {
if (resource_int_value("bvmdbg", 0, "port", &port) == 0)
bvm_dbg_port = port;
/*
* Return a higher priority than 0 to override other
* gdb dbgport providers that may be present (e.g. uart)
*/
return (1);
if (inw(bvm_dbg_port) == BVM_DBG_SIG) {
/*
* Return a higher priority than 0 to override other
* gdb dbgport providers that may be present (e.g. uart)
*/
return (1);
}
}
return (-1);
}
static void