src/arch/x86/acpi.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <acpi/acpi.h>
#include <arch/ioapic.h>
#include <cf9_reset.h>
#include <cpu/x86/smm.h>
#include <pc80/mc146818rtc.h>

static u16 acpi_sci_int(void)
{
	u8 gsi, irq, flags;

	ioapic_get_sci_pin(&gsi, &irq, &flags);

	/* ACPI Release 6.5, 5.2.9 and 5.2.15.5. */
	if (!CONFIG(ACPI_HAVE_PCAT_8259))
		return gsi;

	assert(irq < 16);
	return irq;
}


void arch_fill_fadt(acpi_fadt_t *fadt)
{
	fadt->sci_int = acpi_sci_int();

	if (CONFIG(HAVE_CF9_RESET)) {
		fadt->reset_reg.space_id = ACPI_ADDRESS_SPACE_IO;
		fadt->reset_reg.bit_width = 8;
		fadt->reset_reg.bit_offset = 0;
		fadt->reset_reg.access_size = ACPI_ACCESS_SIZE_BYTE_ACCESS;
		fadt->reset_reg.addrl = RST_CNT;
		fadt->reset_reg.addrh = 0;

		fadt->reset_value = RST_CPU | SYS_RST;

		fadt->flags |= ACPI_FADT_RESET_REGISTER;
	}

	if (permanent_smi_handler()) {
		fadt->smi_cmd = APM_CNT;
		fadt->acpi_enable = APM_CNT_ACPI_ENABLE;
		fadt->acpi_disable = APM_CNT_ACPI_DISABLE;
	}

	if (CONFIG(PC80_SYSTEM)) {
		/* Currently these are defined to support date alarm only. */
		fadt->day_alrm = RTC_DATE_ALARM;
		fadt->mon_alrm = RTC_MONTH_ALARM;
	}

	/* Careful with USE_OPTION_TABLE. */
	if (CONFIG(USE_PC_CMOS_ALTCENTURY))
		fadt->century = RTC_CLK_ALTCENTURY;
}