Patch {1/2]
Signed-off-by: Charles Fisher <charles.fis...@gdc4s.com
There are a couple of problems that occur with tboot. The first is on
some Dell
laptops, it is necessary to disable the legacy usb interrupts. This
patch
provides a mechanism to enable a developer to do so.
The second problem is that in certain circumstances, data owners
consider the
contents of memory to be sensitive. In these cases, they require that
the e820
map be scrubbed. The other portion of this patch provides a capability
to do
that scrub.
Both options are invoked via the command line, and both default to the
current
behavior - i.e. don't disable the usb interrupts, and don't scrub the
memory.
diff -up tboot-1.7.2/tboot/common/acpi.c.orig
tboot-1.7.2/tboot/common/acpi.c
--- tboot-1.7.2/tboot/common/acpi.c.orig 2012-10-09 14:26:14.279694000
-0700
+++ tboot-1.7.2/tboot/common/acpi.c 2012-10-09 14:28:59.721553000 -0700
@@ -436,6 +436,15 @@ void set_s3_resume_vector(const tboot_ac
acpi_printk("wakeup_vector_address = %llx\n",
acpi_sinfo->wakeup_vector);
acpi_printk("wakeup_vector_value = %llxx\n", resume_vector);
+}
+
+void disable_smis(void)
+{
+ printk("disabling legacy USB SMIs\n");
+ uint32_t pmbase = pcireg_cfgread(0, 31, 0, 0x40, 4) & ~1;
+ uint32_t smi_en = inl(pmbase + 0x30);
+ smi_en &= ~0x20008;
+ outl(pmbase + 0x30, smi_en);
}
/*
diff -up tboot-1.7.2/tboot/common/cmdline.c.orig
tboot-1.7.2/tboot/common/cmdline.c
--- tboot-1.7.2/tboot/common/cmdline.c.orig 2012-10-09
14:26:23.724083000 -0700
+++ tboot-1.7.2/tboot/common/cmdline.c 2012-10-09 14:28:59.723556000
-0700
@@ -74,6 +74,8 @@ static const cmdline_option_t g_tboot_cm
{ "ap_wake_mwait", "false" }, /* true|false */
{ "pcr_map", "legacy" }, /* legacy|da */
{ "min_ram", "0" }, /* size in bytes | 0 for no min */
+ { "scrub_e820", "false" }, /* true|false */
+ { "no_usb", "false" }, /* true|false */
{ NULL, NULL }
};
static char
g_tboot_param_values[ARRAY_SIZE(g_tboot_cmdline_options)][MAX_VALUE_LEN]
;
@@ -423,6 +425,15 @@ bool get_tboot_serial(void)
return parse_serial_param(serial);
}
+bool get_tboot_no_usb(void)
+{
+ const char *no_usb = get_option_val(g_tboot_cmdline_options,
+ g_tboot_param_values,
"no_usb");
+ if ( no_usb == NULL || (strcmp(no_usb, "true") != 0 ))
+ return false;
+ return true;
+}
+
void get_tboot_vga_delay(void)
{
const char *vga_delay = get_option_val(g_tboot_cmdline_options,
@@ -433,6 +444,15 @@ void get_tboot_vga_delay(void)
g_vga_delay = strtoul(vga_delay, NULL, 0);
}
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