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acpi: Add support for DMAR

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The DMA Remapping Reporting (DMAR) table contains information about DMA
remapping.

Add a version simple version of this table with only the minimum fields
filled out. i.e. no entries.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
This commit is contained in:
Simon Glass
2020-04-08 16:57:39 -06:00
committed by Bin Meng
parent 91fe8b79f6
commit bfeb5d460c
3 changed files with 101 additions and 0 deletions
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31
lib/acpi/acpi_table.c
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@@ -7,6 +7,37 @@
#include <common.h>
#include <acpi/acpi_table.h>
#include <dm.h>
#include <cpu.h>
/* Temporary change to ensure bisectability */
#ifndef CONFIG_SANDBOX
int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
{
struct acpi_table_header *header = &dmar->header;
struct cpu_info info;
struct udevice *cpu;
int ret;
ret = uclass_first_device(UCLASS_CPU, &cpu);
if (ret)
return log_msg_ret("cpu", ret);
ret = cpu_get_info(cpu, &info);
if (ret)
return log_msg_ret("info", ret);
memset((void *)dmar, 0, sizeof(struct acpi_dmar));
/* Fill out header fields. */
acpi_fill_header(&dmar->header, "DMAR");
header->length = sizeof(struct acpi_dmar);
header->revision = acpi_get_table_revision(ACPITAB_DMAR);
dmar->host_address_width = info.address_width - 1;
dmar->flags = flags;
return 0;
}
#endif
int acpi_get_table_revision(enum acpi_tables table)
{