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![Bin Meng](/assets/img/avatar_default.png)
Before moving 'current' pointer during ACPI table writing, we always check the table length to see if it is larger than the table header. Since our purpose is to generate valid tables, the check logic is always true, which can be avoided. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
419 lines
11 KiB
C
419 lines
11 KiB
C
/*
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* Based on acpi.c from coreboot
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*
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* Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
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* Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <cpu.h>
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#include <dm.h>
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#include <dm/uclass-internal.h>
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#include <asm/acpi_table.h>
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#include <asm/io.h>
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#include <asm/lapic.h>
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#include <asm/tables.h>
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/*
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* IASL compiles the dsdt entries and writes the hex values
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* to a C array AmlCode[] (see dsdt.c).
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*/
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extern const unsigned char AmlCode[];
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static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
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struct acpi_xsdt *xsdt)
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{
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memset(rsdp, 0, sizeof(struct acpi_rsdp));
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memcpy(rsdp->signature, RSDP_SIG, 8);
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memcpy(rsdp->oem_id, OEM_ID, 6);
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rsdp->length = sizeof(struct acpi_rsdp);
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rsdp->rsdt_address = (u32)rsdt;
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/*
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* Revision: ACPI 1.0: 0, ACPI 2.0/3.0/4.0: 2
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*
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* Some OSes expect an XSDT to be present for RSD PTR revisions >= 2.
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* If we don't have an ACPI XSDT, force ACPI 1.0 (and thus RSD PTR
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* revision 0)
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*/
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if (xsdt == NULL) {
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rsdp->revision = ACPI_RSDP_REV_ACPI_1_0;
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} else {
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rsdp->xsdt_address = (u64)(u32)xsdt;
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rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
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}
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/* Calculate checksums */
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rsdp->checksum = table_compute_checksum((void *)rsdp, 20);
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rsdp->ext_checksum = table_compute_checksum((void *)rsdp,
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sizeof(struct acpi_rsdp));
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}
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void acpi_fill_header(struct acpi_table_header *header, char *signature)
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{
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memcpy(header->signature, signature, 4);
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memcpy(header->oem_id, OEM_ID, 6);
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memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
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memcpy(header->aslc_id, ASLC_ID, 4);
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}
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static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
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{
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struct acpi_table_header *header = &(rsdt->header);
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/* Fill out header fields */
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acpi_fill_header(header, "RSDT");
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header->length = sizeof(struct acpi_rsdt);
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header->revision = 1;
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/* Entries are filled in later, we come with an empty set */
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/* Fix checksum */
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header->checksum = table_compute_checksum((void *)rsdt,
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sizeof(struct acpi_rsdt));
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}
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static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
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{
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struct acpi_table_header *header = &(xsdt->header);
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/* Fill out header fields */
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acpi_fill_header(header, "XSDT");
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header->length = sizeof(struct acpi_xsdt);
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header->revision = 1;
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/* Entries are filled in later, we come with an empty set */
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/* Fix checksum */
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header->checksum = table_compute_checksum((void *)xsdt,
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sizeof(struct acpi_xsdt));
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}
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/**
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* Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
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* and checksum.
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*/
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static void acpi_add_table(struct acpi_rsdp *rsdp, void *table)
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{
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int i, entries_num;
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struct acpi_rsdt *rsdt;
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struct acpi_xsdt *xsdt = NULL;
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/* The RSDT is mandatory while the XSDT is not */
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rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
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if (rsdp->xsdt_address)
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xsdt = (struct acpi_xsdt *)((u32)rsdp->xsdt_address);
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/* This should always be MAX_ACPI_TABLES */
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entries_num = ARRAY_SIZE(rsdt->entry);
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for (i = 0; i < entries_num; i++) {
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if (rsdt->entry[i] == 0)
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break;
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}
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if (i >= entries_num) {
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debug("ACPI: Error: too many tables\n");
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return;
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}
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/* Add table to the RSDT */
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rsdt->entry[i] = (u32)table;
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/* Fix RSDT length or the kernel will assume invalid entries */
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rsdt->header.length = sizeof(struct acpi_table_header) +
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(sizeof(u32) * (i + 1));
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/* Re-calculate checksum */
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rsdt->header.checksum = 0;
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rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
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rsdt->header.length);
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/*
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* And now the same thing for the XSDT. We use the same index as for
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* now we want the XSDT and RSDT to always be in sync in U-Boot
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*/
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if (xsdt) {
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/* Add table to the XSDT */
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xsdt->entry[i] = (u64)(u32)table;
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/* Fix XSDT length */
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xsdt->header.length = sizeof(struct acpi_table_header) +
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(sizeof(u64) * (i + 1));
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/* Re-calculate checksum */
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xsdt->header.checksum = 0;
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xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
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xsdt->header.length);
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}
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}
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static void acpi_create_facs(struct acpi_facs *facs)
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{
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memset((void *)facs, 0, sizeof(struct acpi_facs));
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memcpy(facs->signature, "FACS", 4);
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facs->length = sizeof(struct acpi_facs);
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facs->hardware_signature = 0;
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facs->firmware_waking_vector = 0;
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facs->global_lock = 0;
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facs->flags = 0;
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facs->x_firmware_waking_vector_l = 0;
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facs->x_firmware_waking_vector_h = 0;
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facs->version = 1;
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}
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static int acpi_create_madt_lapic(struct acpi_madt_lapic *lapic,
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u8 cpu, u8 apic)
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{
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lapic->type = ACPI_APIC_LAPIC;
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lapic->length = sizeof(struct acpi_madt_lapic);
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lapic->flags = LOCAL_APIC_FLAG_ENABLED;
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lapic->processor_id = cpu;
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lapic->apic_id = apic;
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return lapic->length;
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}
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int acpi_create_madt_lapics(u32 current)
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{
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struct udevice *dev;
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int length = 0;
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for (uclass_find_first_device(UCLASS_CPU, &dev);
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dev;
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uclass_find_next_device(&dev)) {
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struct cpu_platdata *plat = dev_get_parent_platdata(dev);
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length += acpi_create_madt_lapic(
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(struct acpi_madt_lapic *)current,
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plat->cpu_id, plat->cpu_id);
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current += length;
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}
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return length;
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}
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int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id,
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u32 addr, u32 gsi_base)
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{
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ioapic->type = ACPI_APIC_IOAPIC;
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ioapic->length = sizeof(struct acpi_madt_ioapic);
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ioapic->reserved = 0x00;
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ioapic->gsi_base = gsi_base;
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ioapic->ioapic_id = id;
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ioapic->ioapic_addr = addr;
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return ioapic->length;
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}
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int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
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u8 bus, u8 source, u32 gsirq, u16 flags)
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{
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irqoverride->type = ACPI_APIC_IRQ_SRC_OVERRIDE;
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irqoverride->length = sizeof(struct acpi_madt_irqoverride);
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irqoverride->bus = bus;
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irqoverride->source = source;
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irqoverride->gsirq = gsirq;
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irqoverride->flags = flags;
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return irqoverride->length;
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}
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int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
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u8 cpu, u16 flags, u8 lint)
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{
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lapic_nmi->type = ACPI_APIC_LAPIC_NMI;
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lapic_nmi->length = sizeof(struct acpi_madt_lapic_nmi);
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lapic_nmi->flags = flags;
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lapic_nmi->processor_id = cpu;
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lapic_nmi->lint = lint;
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return lapic_nmi->length;
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}
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static void acpi_create_madt(struct acpi_madt *madt)
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{
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struct acpi_table_header *header = &(madt->header);
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u32 current = (u32)madt + sizeof(struct acpi_madt);
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memset((void *)madt, 0, sizeof(struct acpi_madt));
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/* Fill out header fields */
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acpi_fill_header(header, "APIC");
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header->length = sizeof(struct acpi_madt);
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header->revision = 4;
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madt->lapic_addr = LAPIC_DEFAULT_BASE;
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madt->flags = ACPI_MADT_PCAT_COMPAT;
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current = acpi_fill_madt(current);
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/* (Re)calculate length and checksum */
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header->length = current - (u32)madt;
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header->checksum = table_compute_checksum((void *)madt, header->length);
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}
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static int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig,
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u32 base, u16 seg_nr, u8 start, u8 end)
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{
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memset(mmconfig, 0, sizeof(*mmconfig));
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mmconfig->base_address_l = base;
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mmconfig->base_address_h = 0;
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mmconfig->pci_segment_group_number = seg_nr;
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mmconfig->start_bus_number = start;
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mmconfig->end_bus_number = end;
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return sizeof(struct acpi_mcfg_mmconfig);
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}
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static u32 acpi_fill_mcfg(u32 current)
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{
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current += acpi_create_mcfg_mmconfig
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((struct acpi_mcfg_mmconfig *)current,
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CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
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return current;
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}
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/* MCFG is defined in the PCI Firmware Specification 3.0 */
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static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
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{
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struct acpi_table_header *header = &(mcfg->header);
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u32 current = (u32)mcfg + sizeof(struct acpi_mcfg);
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memset((void *)mcfg, 0, sizeof(struct acpi_mcfg));
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/* Fill out header fields */
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acpi_fill_header(header, "MCFG");
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header->length = sizeof(struct acpi_mcfg);
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header->revision = 1;
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current = acpi_fill_mcfg(current);
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/* (Re)calculate length and checksum */
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header->length = current - (u32)mcfg;
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header->checksum = table_compute_checksum((void *)mcfg, header->length);
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}
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static void enter_acpi_mode(int pm1_cnt)
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{
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/*
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* PM1_CNT register bit0 selects the power management event to be
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* either an SCI or SMI interrupt. When this bit is set, then power
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* management events will generate an SCI interrupt. When this bit
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* is reset power management events will generate an SMI interrupt.
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*
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* Per ACPI spec, it is the responsibility of the hardware to set
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* or reset this bit. OSPM always preserves this bit position.
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*
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* U-Boot does not support SMI. And we don't have plan to support
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* anything running in SMM within U-Boot. To create a legacy-free
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* system, and expose ourselves to OSPM as working under ACPI mode
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* already, turn this bit on.
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*/
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outw(PM1_CNT_SCI_EN, pm1_cnt);
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}
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/*
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* QEMU's version of write_acpi_tables is defined in
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* arch/x86/cpu/qemu/acpi_table.c
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*/
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u32 write_acpi_tables(u32 start)
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{
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u32 current;
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struct acpi_rsdp *rsdp;
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struct acpi_rsdt *rsdt;
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struct acpi_xsdt *xsdt;
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struct acpi_facs *facs;
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struct acpi_table_header *dsdt;
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struct acpi_fadt *fadt;
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struct acpi_mcfg *mcfg;
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struct acpi_madt *madt;
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current = start;
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/* Align ACPI tables to 16 byte */
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current = ALIGN(current, 16);
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debug("ACPI: Writing ACPI tables at %x\n", start);
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/* We need at least an RSDP and an RSDT Table */
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rsdp = (struct acpi_rsdp *)current;
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current += sizeof(struct acpi_rsdp);
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current = ALIGN(current, 16);
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rsdt = (struct acpi_rsdt *)current;
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current += sizeof(struct acpi_rsdt);
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current = ALIGN(current, 16);
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xsdt = (struct acpi_xsdt *)current;
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current += sizeof(struct acpi_xsdt);
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/*
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* Per ACPI spec, the FACS table address must be aligned to a 64 byte
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* boundary (Windows checks this, but Linux does not).
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*/
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current = ALIGN(current, 64);
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/* clear all table memory */
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memset((void *)start, 0, current - start);
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acpi_write_rsdp(rsdp, rsdt, xsdt);
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acpi_write_rsdt(rsdt);
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acpi_write_xsdt(xsdt);
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debug("ACPI: * FACS\n");
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facs = (struct acpi_facs *)current;
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current += sizeof(struct acpi_facs);
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current = ALIGN(current, 16);
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acpi_create_facs(facs);
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debug("ACPI: * DSDT\n");
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dsdt = (struct acpi_table_header *)current;
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memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header));
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current += sizeof(struct acpi_table_header);
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memcpy((char *)current,
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(char *)&AmlCode + sizeof(struct acpi_table_header),
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dsdt->length - sizeof(struct acpi_table_header));
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current += dsdt->length - sizeof(struct acpi_table_header);
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current = ALIGN(current, 16);
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debug("ACPI: * FADT\n");
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fadt = (struct acpi_fadt *)current;
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current += sizeof(struct acpi_fadt);
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current = ALIGN(current, 16);
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acpi_create_fadt(fadt, facs, dsdt);
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acpi_add_table(rsdp, fadt);
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debug("ACPI: * MADT\n");
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madt = (struct acpi_madt *)current;
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acpi_create_madt(madt);
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current += madt->header.length;
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acpi_add_table(rsdp, madt);
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current = ALIGN(current, 16);
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debug("ACPI: * MCFG\n");
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mcfg = (struct acpi_mcfg *)current;
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acpi_create_mcfg(mcfg);
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current += mcfg->header.length;
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acpi_add_table(rsdp, mcfg);
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current = ALIGN(current, 16);
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debug("current = %x\n", current);
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debug("ACPI: done\n");
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/*
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* Other than waiting for OSPM to request us to switch to ACPI mode,
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* do it by ourselves, since SMI will not be triggered.
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*/
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enter_acpi_mode(fadt->pm1a_cnt_blk);
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return current;
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}
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