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acpi: Move the table-finding functions into the libary

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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>
This commit is contained in:
Simon Glass 2023-05-04 16:54:58 -06:00 committed by Bin Meng
parent 0992a90daa
commit 37bf44073b
4 changed files with 56 additions and 39 deletions
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40
cmd/acpi.c
View file

@ -36,49 +36,11 @@ static void dump_hdr(struct acpi_table_header *hdr)
}
}
/**
* find_table() - Look up an ACPI table
*
* @sig: Signature of table (4 characters, upper case)
* Return: pointer to table header, or NULL if not found
*/
struct acpi_table_header *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;
}
static int dump_table_name(const char *sig)
{
struct acpi_table_header *hdr;
hdr = find_table(sig);
hdr = acpi_find_table(sig);
if (!hdr)
return -ENOENT;
printf("%.*s @ %08lx\n", ACPI_NAME_LEN, hdr->signature,

8
include/acpi/acpi_table.h
View file

@ -923,6 +923,14 @@ int acpi_fill_csrt(struct acpi_ctx *ctx);
*/
ulong write_acpi_tables(ulong start);
/**
* acpi_find_table() - Look up an ACPI table
*
* @sig: Signature of table (4 characters, upper case)
* Return: pointer to table header, or NULL if not found
*/
struct acpi_table_header *acpi_find_table(const char *sig);
#endif /* !__ACPI__*/
#include <asm/acpi_table.h>

2
lib/acpi/Makefile
View file

@ -1,6 +1,8 @@
# SPDX-License-Identifier: GPL-2.0+
#
obj-y += acpi.o
ifdef CONFIG_$(SPL_TPL_)GENERATE_ACPI_TABLE
obj-$(CONFIG_$(SPL_)ACPIGEN) += acpigen.o

45
lib/acpi/acpi.c Normal file
View file

@ -0,0 +1,45 @@
// 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;
}