u-boot/arch/x86/lib/acpi_table.c

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/*
* Based on acpi.c from coreboot
*
* Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <cpu.h>
#include <dm.h>
#include <dm/uclass-internal.h>
#include <dm/lists.h>
#include <asm/acpi_table.h>
#include <asm/cpu.h>
#include <asm/ioapic.h>
#include <asm/lapic.h>
#include <asm/tables.h>
#include <asm/pci.h>
/*
* IASL compiles the dsdt entries and
* writes the hex values to AmlCode array.
* CamelCase cannot be handled here.
*/
extern const unsigned char AmlCode[];
/**
* Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
* and checksum.
*/
static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
{
int i, entries_num;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt = NULL;
/* The RSDT is mandatory while the XSDT is not */
rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
if (rsdp->xsdt_address)
xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
/* This should always be MAX_ACPI_TABLES */
entries_num = ARRAY_SIZE(rsdt->entry);
for (i = 0; i < entries_num; i++) {
if (rsdt->entry[i] == 0)
break;
}
if (i >= entries_num) {
debug("ACPI: Error: too many tables.\n");
return;
}
/* Add table to the RSDT */
rsdt->entry[i] = (u32)table;
/* Fix RSDT length or the kernel will assume invalid entries */
rsdt->header.length = sizeof(acpi_header_t) + (sizeof(u32) * (i + 1));
/* Re-calculate checksum */
rsdt->header.checksum = 0;
rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
rsdt->header.length);
/*
* And now the same thing for the XSDT. We use the same index as for
* now we want the XSDT and RSDT to always be in sync in U-Boot
*/
if (xsdt) {
/* Add table to the XSDT */
xsdt->entry[i] = (u64)(u32)table;
/* Fix XSDT length */
xsdt->header.length = sizeof(acpi_header_t) +
(sizeof(u64) * (i + 1));
/* Re-calculate checksum */
xsdt->header.checksum = 0;
xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
xsdt->header.length);
}
}
static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
u8 cpu, u8 apic)
{
lapic->type = LOCALAPIC; /* Local APIC structure */
lapic->length = sizeof(struct acpi_madt_lapic);
lapic->flags = LOCAL_APIC_FLAG_ENABLED; /* Processor/LAPIC enabled */
lapic->processor_id = cpu;
lapic->apic_id = apic;
return lapic->length;
}
unsigned long acpi_create_madt_lapics(unsigned long current)
{
struct udevice *dev;
for (uclass_find_first_device(UCLASS_CPU, &dev);
dev;
uclass_find_next_device(&dev)) {
struct cpu_platdata *plat = dev_get_parent_platdata(dev);
current += acpi_create_madt_lapic(
(struct acpi_madt_lapic *)current,
plat->cpu_id, plat->cpu_id);
}
return current;
}
int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id, u32 addr,
u32 gsi_base)
{
ioapic->type = IOAPIC;
ioapic->length = sizeof(struct acpi_madt_ioapic);
ioapic->reserved = 0x00;
ioapic->gsi_base = gsi_base;
ioapic->ioapic_id = id;
ioapic->ioapic_addr = addr;
return ioapic->length;
}
int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
u8 bus, u8 source, u32 gsirq, u16 flags)
{
irqoverride->type = IRQSOURCEOVERRIDE;
irqoverride->length = sizeof(struct acpi_madt_irqoverride);
irqoverride->bus = bus;
irqoverride->source = source;
irqoverride->gsirq = gsirq;
irqoverride->flags = flags;
return irqoverride->length;
}
int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
u8 cpu, u16 flags, u8 lint)
{
lapic_nmi->type = LOCALNMITYPE;
lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
lapic_nmi->flags = flags;
lapic_nmi->processor_id = cpu;
lapic_nmi->lint = lint;
return lapic_nmi->length;
}
static void fill_header(acpi_header_t *header, char *signature, int length)
{
memcpy(header->signature, signature, length);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
memcpy(header->asl_compiler_id, ASLC, 4);
}
static void acpi_create_madt(struct acpi_madt *madt)
{
acpi_header_t *header = &(madt->header);
unsigned long current = (unsigned long)madt + sizeof(struct acpi_madt);
memset((void *)madt, 0, sizeof(struct acpi_madt));
/* Fill out header fields */
fill_header(header, "APIC", 4);
header->length = sizeof(struct acpi_madt);
/* ACPI 1.0/2.0: 1, ACPI 3.0: 2, ACPI 4.0: 3 */
header->revision = ACPI_REV_ACPI_2_0;
madt->lapic_addr = LAPIC_DEFAULT_BASE;
madt->flags = PCAT_COMPAT;
current = acpi_fill_madt(current);
/* (Re)calculate length and checksum */
header->length = current - (unsigned long)madt;
header->checksum = table_compute_checksum((void *)madt, header->length);
}
static int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig,
u32 base, u16 seg_nr, u8 start, u8 end)
{
memset(mmconfig, 0, sizeof(*mmconfig));
mmconfig->base_address = base;
mmconfig->base_reserved = 0;
mmconfig->pci_segment_group_number = seg_nr;
mmconfig->start_bus_number = start;
mmconfig->end_bus_number = end;
return sizeof(struct acpi_mcfg_mmconfig);
}
static unsigned long acpi_fill_mcfg(unsigned long current)
{
current += acpi_create_mcfg_mmconfig
((struct acpi_mcfg_mmconfig *)current,
CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
return current;
}
/* MCFG is defined in the PCI Firmware Specification 3.0 */
static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
{
acpi_header_t *header = &(mcfg->header);
unsigned long current = (unsigned long)mcfg + sizeof(struct acpi_mcfg);
memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
/* Fill out header fields */
fill_header(header, "MCFG", 4);
header->length = sizeof(struct acpi_mcfg);
/* ACPI 1.0/2.0: 1, ACPI 3.0: 2, ACPI 4.0: 3 */
header->revision = ACPI_REV_ACPI_2_0;
current = acpi_fill_mcfg(current);
/* (Re)calculate length and checksum */
header->length = current - (unsigned long)mcfg;
header->checksum = table_compute_checksum((void *)mcfg, header->length);
}
static void acpi_create_facs(struct acpi_facs *facs)
{
memset((void *)facs, 0, sizeof(struct acpi_facs));
memcpy(facs->signature, "FACS", 4);
facs->length = sizeof(struct acpi_facs);
facs->hardware_signature = 0;
facs->firmware_waking_vector = 0;
facs->global_lock = 0;
facs->flags = 0;
facs->x_firmware_waking_vector_l = 0;
facs->x_firmware_waking_vector_h = 0;
facs->version = 1; /* ACPI 1.0: 0, ACPI 2.0/3.0: 1, ACPI 4.0: 2 */
}
static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
{
acpi_header_t *header = &(rsdt->header);
/* Fill out header fields */
fill_header(header, "RSDT", 4);
header->length = sizeof(struct acpi_rsdt);
/* ACPI 1.0/2.0: 1, ACPI 3.0: 2, ACPI 4.0: 3 */
header->revision = ACPI_REV_ACPI_2_0;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum((void *)rsdt,
sizeof(struct acpi_rsdt));
}
static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
{
acpi_header_t *header = &(xsdt->header);
/* Fill out header fields */
fill_header(header, "XSDT", 4);
header->length = sizeof(struct acpi_xsdt);
/* ACPI 1.0/2.0: 1, ACPI 3.0: 2, ACPI 4.0: 3 */
header->revision = ACPI_REV_ACPI_2_0;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum((void *)xsdt,
sizeof(struct acpi_xsdt));
}
static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
struct acpi_xsdt *xsdt)
{
memset(rsdp, 0, sizeof(struct acpi_rsdp));
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->rsdt_address = (u32)rsdt;
/*
* Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
*
* Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
* If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
* revision 0)
*/
if (xsdt == NULL) {
rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
} else {
rsdp->xsdt_address = (u64)(u32)xsdt;
rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
}
/* Calculate checksums */
rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
sizeof(struct acpi_rsdp));
}
static void acpi_create_ssdt_generator(acpi_header_t *ssdt,
const char *oem_table_id)
{
unsigned long current = (unsigned long)ssdt + sizeof(acpi_header_t);
memset((void *)ssdt, 0, sizeof(acpi_header_t));
memcpy(&ssdt->signature, "SSDT", 4);
/* Access size in ACPI 2.0c/3.0/4.0/5.0 */
ssdt->revision = ACPI_REV_ACPI_3_0;
memcpy(&ssdt->oem_id, OEM_ID, 6);
memcpy(&ssdt->oem_table_id, oem_table_id, 8);
ssdt->oem_revision = OEM_REVISION;
memcpy(&ssdt->asl_compiler_id, ASLC, 4);
ssdt->asl_compiler_revision = ASL_COMPILER_REVISION;
ssdt->length = sizeof(acpi_header_t);
/* (Re)calculate length and checksum */
ssdt->length = current - (unsigned long)ssdt;
ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
}
/*
* QEMU's version of write_acpi_tables is defined in
* arch/x86/cpu/qemu/fw_cfg.c
*/
u32 write_acpi_tables(u32 start)
{
u32 current;
struct acpi_rsdp *rsdp;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt;
struct acpi_facs *facs;
acpi_header_t *dsdt;
struct acpi_fadt *fadt;
struct acpi_mcfg *mcfg;
struct acpi_madt *madt;
acpi_header_t *ssdt;
current = start;
/* Align ACPI tables to 16byte */
current = ALIGN(current, 16);
debug("ACPI: Writing ACPI tables at %lx.\n", start);
/* We need at least an RSDP and an RSDT Table */
rsdp = (struct acpi_rsdp *)current;
current += sizeof(struct acpi_rsdp);
current = ALIGN(current, 16);
rsdt = (struct acpi_rsdt *)current;
current += sizeof(struct acpi_rsdt);
current = ALIGN(current, 16);
xsdt = (struct acpi_xsdt *)current;
current += sizeof(struct acpi_xsdt);
current = ALIGN(current, 16);
/* clear all table memory */
memset((void *)start, 0, current - start);
acpi_write_rsdp(rsdp, rsdt, xsdt);
acpi_write_rsdt(rsdt);
acpi_write_xsdt(xsdt);
debug("ACPI: * FACS\n");
facs = (struct acpi_facs *)current;
current += sizeof(struct acpi_facs);
current = ALIGN(current, 16);
acpi_create_facs(facs);
debug("ACPI: * DSDT\n");
dsdt = (acpi_header_t *)current;
memcpy(dsdt, &AmlCode, sizeof(acpi_header_t));
if (dsdt->length >= sizeof(acpi_header_t)) {
current += sizeof(acpi_header_t);
memcpy((char *)current,
(char *)&AmlCode + sizeof(acpi_header_t),
dsdt->length - sizeof(acpi_header_t));
current += dsdt->length - sizeof(acpi_header_t);
/* (Re)calculate length and checksum */
dsdt->length = current - (unsigned long)dsdt;
dsdt->checksum = 0;
dsdt->checksum = table_compute_checksum((void *)dsdt,
dsdt->length);
}
current = ALIGN(current, 16);
debug("ACPI: * FADT\n");
fadt = (struct acpi_fadt *)current;
current += sizeof(struct acpi_fadt);
current = ALIGN(current, 16);
acpi_create_fadt(fadt, facs, dsdt);
acpi_add_table(rsdp, fadt);
debug("ACPI: * MCFG\n");
mcfg = (struct acpi_mcfg *)current;
acpi_create_mcfg(mcfg);
if (mcfg->header.length > sizeof(struct acpi_mcfg)) {
current += mcfg->header.length;
current = ALIGN(current, 16);
acpi_add_table(rsdp, mcfg);
}
debug("ACPI: * MADT\n");
madt = (struct acpi_madt *)current;
acpi_create_madt(madt);
if (madt->header.length > sizeof(struct acpi_madt)) {
current += madt->header.length;
acpi_add_table(rsdp, madt);
}
current = ALIGN(current, 16);
debug("ACPI: * SSDT\n");
ssdt = (acpi_header_t *)current;
acpi_create_ssdt_generator(ssdt, ACPI_TABLE_CREATOR);
if (ssdt->length > sizeof(acpi_header_t)) {
current += ssdt->length;
acpi_add_table(rsdp, ssdt);
current = ALIGN(current, 16);
}
debug("current = %lx\n", current);
debug("ACPI: done.\n");
return current;
}