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x86: acpi: Add PCT and PTC tables

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These are needed for the CPU tables. Add them into an x86-specific file
since we do not support them on sandbox, or include tests.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-22 12:45:12 -06:00 • committed by Bin Meng
parent 15403289e5
commit 7764a8481c
3 changed files with 132 additions and 1 deletions
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35
arch/x86/include/asm/acpigen.h Normal file
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@ -0,0 +1,35 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Generation of x86-specific ACPI tables
*
* Copyright 2020 Google LLC
*/
#ifndef __ASM_ACPIGEN_H__
#define __ASM_ACPIGEN_H__
struct acpi_ctx;
/**
* acpigen_write_empty_pct() - Write an empty PCT
*
* See ACPI v6.3 section 8.4.6.1: _PCT (Performance Control)
*
* This writes an empty table so that CPU performance works as expected
*
* @ctx: ACPI context pointer
*/
void acpigen_write_empty_pct(struct acpi_ctx *ctx);
/**
* acpigen_write_empty_ptc() - Write an empty PTC
*
* See ACPI v6.3 section 8.4.5.1: _PTC (Processor Throttling Control)
*
* This writes an empty table so that CPU performance works as expected
*
* @ctx: ACPI context pointer
*/
void acpigen_write_empty_ptc(struct acpi_ctx *ctx);
#endif /* __ASM_ACPI_H__ */

2
arch/x86/lib/Makefile
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@ -38,7 +38,7 @@ obj-y += sfi.o
obj-y += acpi.o
obj-$(CONFIG_HAVE_ACPI_RESUME) += acpi_s3.o
ifndef CONFIG_QEMU
obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o
obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o acpigen.o
endif
obj-y += tables.o
ifndef CONFIG_SPL_BUILD

96
arch/x86/lib/acpigen.c Normal file
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@ -0,0 +1,96 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Google LLC
*/
#include <common.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_table.h>
#include <asm/acpigen.h>
void acpigen_write_empty_pct(struct acpi_ctx *ctx)
{
/*
* Name (_PCT, Package (0x02)
* {
* ResourceTemplate ()
* {
* Register (FFixedHW,
* 0x00, // Bit Width
* 0x00, // Bit Offset
* 0x0000000000000000, // Address
* ,)
* },
*
* ResourceTemplate ()
* {
* Register (FFixedHW,
* 0x00, // Bit Width
* 0x00, // Bit Offset
* 0x0000000000000000, // Address
* ,)
* }
* })
*/
static char stream[] = {
/* 00000030 "0._PCT.," */
0x08, 0x5f, 0x50, 0x43, 0x54, 0x12, 0x2c,
/* 00000038 "........" */
0x02, 0x11, 0x14, 0x0a, 0x11, 0x82, 0x0c, 0x00,
/* 00000040 "........" */
0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* 00000048 "....y..." */
0x00, 0x00, 0x00, 0x00, 0x79, 0x00, 0x11, 0x14,
/* 00000050 "........" */
0x0a, 0x11, 0x82, 0x0c, 0x00, 0x7f, 0x00, 0x00,
/* 00000058 "........" */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x79, 0x00
};
acpigen_emit_stream(ctx, stream, ARRAY_SIZE(stream));
}
void acpigen_write_empty_ptc(struct acpi_ctx *ctx)
{
/*
* Name (_PTC, Package (0x02)
* {
* ResourceTemplate ()
* {
* Register (FFixedHW,
* 0x00, // Bit Width
* 0x00, // Bit Offset
* 0x0000000000000000, // Address
* ,)
* },
*
* ResourceTemplate ()
* {
* Register (FFixedHW,
* 0x00, // Bit Width
* 0x00, // Bit Offset
* 0x0000000000000000, // Address
* ,)
* }
* })
*/
struct acpi_gen_regaddr addr = {
.space_id = ACPI_ADDRESS_SPACE_FIXED,
.bit_width = 0,
.bit_offset = 0,
.access_size = 0,
.addrl = 0,
.addrh = 0,
};
acpigen_write_name(ctx, "_PTC");
acpigen_write_package(ctx, 2);
/* ControlRegister */
acpigen_write_register_resource(ctx, &addr);
/* StatusRegister */
acpigen_write_register_resource(ctx, &addr);
acpigen_pop_len(ctx);
}