mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-04 14:00:19 +00:00
37bf44073b
This is useful for other features. Move the function into library code so it can be used outside just the 'acpi' command. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Utility functions for ACPI
|
|
*
|
|
* Copyright 2023 Google LLC
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <mapmem.h>
|
|
#include <acpi/acpi_table.h>
|
|
#include <asm/global_data.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct acpi_table_header *acpi_find_table(const char *sig)
|
|
{
|
|
struct acpi_rsdp *rsdp;
|
|
struct acpi_rsdt *rsdt;
|
|
int len, i, count;
|
|
|
|
rsdp = map_sysmem(gd_acpi_start(), 0);
|
|
if (!rsdp)
|
|
return NULL;
|
|
rsdt = map_sysmem(rsdp->rsdt_address, 0);
|
|
len = rsdt->header.length - sizeof(rsdt->header);
|
|
count = len / sizeof(u32);
|
|
for (i = 0; i < count; i++) {
|
|
struct acpi_table_header *hdr;
|
|
|
|
hdr = map_sysmem(rsdt->entry[i], 0);
|
|
if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN))
|
|
return hdr;
|
|
if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {
|
|
struct acpi_fadt *fadt = (struct acpi_fadt *)hdr;
|
|
|
|
if (!memcmp(sig, "DSDT", ACPI_NAME_LEN) && fadt->dsdt)
|
|
return map_sysmem(fadt->dsdt, 0);
|
|
if (!memcmp(sig, "FACS", ACPI_NAME_LEN) &&
|
|
fadt->firmware_ctrl)
|
|
return map_sysmem(fadt->firmware_ctrl, 0);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|