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Be more conservative about setting hw.uart.console

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Note when we've found a 8250 PNP node. Only try to set hw.uart.console
if we see one (otherwise ignore serial hints). The 8250 is the only
one known to have I/O ports, so limit the guessing to when we've
positively seen one.  And limit this to x86 since that's the only
platform where we have I/O ports. Otherwise, we'd set the serial port
to something crazy for the platform and fall off the cliff early in
boot.

Differential Revision:  https://reviews.freebsd.org/D16463
This commit is contained in:
Warner Losh 2018-07-28 19:44:20 +00:00
parent 858178a142
commit e78f6dd79f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336837
2 changed files with 35 additions and 16 deletions
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34
stand/efi/loader/bootinfo.c
View File

@ -82,10 +82,13 @@ bi_getboothowto(char *kargs)
howto |= RB_SERIAL;
if (strcmp(console, "nullconsole") == 0)
howto |= RB_MUTE;
if (strcmp(console, "efi") == 0) {
#if defined(__i386__) || defined(__amd64__)
if (strcmp(console, "efi") == 0 &&
getenv("efi_8250_uid") != NULL &&
getenv("hw.uart.console") == NULL) {
/*
* If we found a com port and com speed, we need to tell
* the kernel where the serial port is, and how
* If we found a 8250 com port and com speed, we need to
* tell the kernel where the serial port is, and how
* fast. Ideally, we'd get the port from ACPI, but that
* isn't running in the loader. Do the next best thing
* by allowing it to be set by a loader.conf variable,
@ -93,24 +96,31 @@ bi_getboothowto(char *kargs)
* comconsole_port if not. PCI support is needed, but
* for that we'd ideally refactor the
* libi386/comconsole.c code to have identical behavior.
* We only try to set the port for cases where we saw
* the Serial(x) node when parsing, otherwise
* specialized hardware that has Uart nodes will have a
* bogus address set.
* But if someone specifically setup hw.uart.console,
* don't override that.
*/
speed = -1;
port = -1;
tmp = getenv("efi_com_speed");
if (tmp != NULL) {
if (tmp != NULL)
speed = strtol(tmp, NULL, 0);
tmp = getenv("efi_com_port");
if (tmp == NULL)
tmp = getenv("comconsole_port");
/* XXX fallback to EFI variable set in rc.d? */
if (tmp != NULL)
port = strtol(tmp, NULL, 0);
else
port = 0x3f8;
tmp = getenv("efi_com_port");
if (tmp == NULL)
tmp = getenv("comconsole_port");
if (tmp != NULL)
port = strtol(tmp, NULL, 0);
if (speed != -1 && port != -1) {
snprintf(buf, sizeof(buf), "io:%d,br:%d", port,
speed);
env_setenv("hw.uart.console", EV_VOLATILE, buf,
NULL, NULL);
}
}
#endif
}
return (howto);

17
stand/efi/loader/main.c
View File

@ -644,6 +644,15 @@ parse_args(int argc, CHAR16 *argv[])
return (howto);
}
static void
setenv_int(const char *key, int val)
{
char buf[20];
snprintf(buf, sizeof(buf), "%d", val);
setenv(key, buf, 1);
}
/*
* Parse ConOut (the list of consoles active) and see if we can find a
* serial port and/or a video port. It would be nice to also walk the
@ -675,15 +684,15 @@ parse_uefi_con_out(void)
DevicePathSubType(node) == ACPI_DP) {
/* Check for Serial node */
acpi = (void *)node;
if (EISA_ID_TO_NUM(acpi->HID) == 0x501)
if (EISA_ID_TO_NUM(acpi->HID) == 0x501) {
setenv_int("efi_8250_uid", acpi->UID);
com_seen = ++seen;
}
} else if (DevicePathType(node) == MESSAGING_DEVICE_PATH &&
DevicePathSubType(node) == MSG_UART_DP) {
char bd[16];
uart = (void *)node;
snprintf(bd, sizeof(bd), "%d", uart->BaudRate);
setenv("efi_com_speed", bd, 1);
setenv_int("efi_com_speed", uart->BaudRate);
} else if (DevicePathType(node) == ACPI_DEVICE_PATH &&
DevicePathSubType(node) == ACPI_ADR_DP) {
/* Check for AcpiAdr() Node for video */