dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-01 08:42:12 +02:00
Code Issues Packages Projects Releases Wiki Activity

acpi: Support generation of ACPI code

Browse Source 
Add a new file to handle generating ACPI code programatically. This is
used when information must be dynamically added to the tables, e.g. the
SSDT.

Initial support is just for writing simple values. Also add a 'base' value
so that the table can be freed. This likely doesn't happen in normal code,
but is nice to do in tests.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2020-07-07 13:11:42 -06:00
committed by Bin Meng
parent f4955137f5
commit 61cc93396a
7 changed files with 165 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
lib/acpi/Makefile
View File

@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0+
#
obj-y += acpigen.o
obj-y += acpi_device.o
obj-y += acpi_table.o

1
lib/acpi/acpi_table.c
View File

@@ -237,6 +237,7 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
{
ctx->base = start;
ctx->current = start;
/* Align ACPI tables to 16 byte */

39
lib/acpi/acpigen.c Normal file
View File

@@ -0,0 +1,39 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Generation of ACPI (Advanced Configuration and Power Interface) tables
*
* Copyright 2019 Google LLC
* Mostly taken from coreboot
*/
#define LOG_CATEGORY LOGC_ACPI
#include <common.h>
#include <dm.h>
#include <acpi/acpigen.h>
#include <dm/acpi.h>
u8 *acpigen_get_current(struct acpi_ctx *ctx)
{
return ctx->current;
}
void acpigen_emit_byte(struct acpi_ctx *ctx, uint data)
{
*(u8 *)ctx->current++ = data;
}
void acpigen_emit_word(struct acpi_ctx *ctx, uint data)
{
acpigen_emit_byte(ctx, data & 0xff);
acpigen_emit_byte(ctx, (data >> 8) & 0xff);
}
void acpigen_emit_dword(struct acpi_ctx *ctx, uint data)
{
/* Output the value in little-endian format */
acpigen_emit_byte(ctx, data & 0xff);
acpigen_emit_byte(ctx, (data >> 8) & 0xff);
acpigen_emit_byte(ctx, (data >> 16) & 0xff);
acpigen_emit_byte(ctx, (data >> 24) & 0xff);
}