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Handle platforms where SCI is not available. #132

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Handle platforms where SCI is not available. #132

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62 changes: 39 additions & 23 deletions helpers/sci.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,11 +12,14 @@

// read contents of event registers.
uint16_t lai_get_sci_event(void) {
if (!laihost_inw || !laihost_outw)
lai_panic("lai_read_event() requires port I/O");

struct lai_instance *instance = lai_current_instance();

if (!instance->fadt->pm1a_event_block && !instance->fadt->pm1b_event_block)
return 0;

if (!laihost_inw || !laihost_outw)
lai_panic("lai_get_sci_event() requires port I/O");

uint16_t a = 0, b = 0;
if (instance->fadt->pm1a_event_block) {
a = laihost_inw(instance->fadt->pm1a_event_block);
Expand All @@ -31,11 +34,14 @@ uint16_t lai_get_sci_event(void) {

// set event enable registers
void lai_set_sci_event(uint16_t value) {
if (!laihost_inw || !laihost_outw)
lai_panic("lai_set_event() requires port I/O");

struct lai_instance *instance = lai_current_instance();

if (!instance->fadt->pm1a_event_block && !instance->fadt->pm1b_event_block)
return;

if (!laihost_inw || !laihost_outw)
lai_panic("lai_set_sci_event() requires port I/O");

uint16_t a = instance->fadt->pm1a_event_block + (instance->fadt->pm1_event_length / 2);
uint16_t b = instance->fadt->pm1b_event_block + (instance->fadt->pm1_event_length / 2);

Expand All @@ -59,10 +65,12 @@ int lai_enable_acpi(uint32_t mode) {

struct lai_instance *instance = lai_current_instance();

if (!laihost_inw || !laihost_outb)
lai_panic("lai_enable_acpi() requires port I/O");
if (!laihost_sleep)
lai_panic("host does not provide timer functions required by lai_enable_acpi()");
if (instance->fadt->smi_command_port) {
if (!laihost_inw || !laihost_outb)
lai_panic("lai_enable_acpi() requires port I/O");
if (!laihost_sleep)
lai_panic("host does not provide timer functions required by lai_enable_acpi()");
}

/* first run \._SB_._INI */
handle = lai_resolve_path(NULL, "\\_SB_._INI");
Expand Down Expand Up @@ -92,14 +100,16 @@ int lai_enable_acpi(uint32_t mode) {
}

/* enable ACPI SCI */
laihost_outb(instance->fadt->smi_command_port, instance->fadt->acpi_enable);
laihost_sleep(10);
if (instance->fadt->smi_command_port) {
laihost_outb(instance->fadt->smi_command_port, instance->fadt->acpi_enable);
laihost_sleep(10);

for (size_t i = 0; i < 100; i++) {
if (laihost_inw(instance->fadt->pm1a_control_block) & ACPI_ENABLED)
break;
for (size_t i = 0; i < 100; i++) {
if (laihost_inw(instance->fadt->pm1a_control_block) & ACPI_ENABLED)
break;

laihost_sleep(10);
laihost_sleep(10);
}
}

/* set FADT event fields */
Expand All @@ -111,21 +121,25 @@ int lai_enable_acpi(uint32_t mode) {
}

int lai_disable_acpi(void) {
if (!laihost_inw || !laihost_outw)
lai_panic("lai_read_event() requires port I/O");

struct lai_instance *instance = lai_current_instance();

if (instance->fadt->pm1a_control_block || instance->fadt->pm1b_control_block) {
if (!laihost_inw || !laihost_outw)
lai_panic("lai_disable_acpi() requires port I/O");
}

lai_debug("attempt to disable ACPI...");

// Disable all SCI events
lai_set_sci_event(0);
lai_get_sci_event();

// Clear SCI_EN (APCI_ENABLED in lai) so to stop SCIs from arriving
uint16_t pm1a_cnt_block = laihost_inw(instance->fadt->pm1a_control_block);
pm1a_cnt_block &= ~ACPI_ENABLED;
laihost_outw(instance->fadt->pm1a_control_block, pm1a_cnt_block);
if (instance->fadt->pm1a_control_block) {
uint16_t pm1a_cnt_block = laihost_inw(instance->fadt->pm1a_control_block);
pm1a_cnt_block &= ~ACPI_ENABLED;
laihost_outw(instance->fadt->pm1a_control_block, pm1a_cnt_block);
}

if (instance->fadt->pm1b_control_block) {
uint16_t pm1b_cnt_block = laihost_inw(instance->fadt->pm1b_control_block);
Expand All @@ -134,7 +148,9 @@ int lai_disable_acpi(void) {
}

// Send the definitive ACPI_DISABLE command
laihost_outb(instance->fadt->smi_command_port, instance->fadt->acpi_disable);
if (instance->fadt->smi_command_port) {
laihost_outb(instance->fadt->smi_command_port, instance->fadt->acpi_disable);
}

lai_debug("Success");
return 0;
Expand Down