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// SPDX-License-Identifier: GPL-2.0+
/*
* Write the ACPI Differentiated System Description Table (DSDT)
*
* Copyright 2021 Google LLC
*/
#define LOG_CATEGORY LOGC_ACPI
#include <acpi/acpi_table.h>
#include <dm/acpi.h>
#include <tables_csum.h>
#include <linux/string.h>
/*
* IASL compiles the dsdt entries and writes the hex values
* to a C array AmlCode[] (see dsdt.c).
*/
extern const unsigned char AmlCode[];
int acpi_write_dsdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
{
const int thl = sizeof(struct acpi_table_header);
struct acpi_table_header *dsdt = ctx->current;
int aml_len;
/* Put the table header first */
memcpy(dsdt, &AmlCode, thl);
acpi_inc(ctx, thl);
log_debug("DSDT starts at %p, hdr ends at %p\n", dsdt, ctx->current);
/* If the table is not empty, allow devices to inject things */
aml_len = dsdt->length - thl;
if (aml_len) {
void *base = ctx->current;
int ret;
ret = acpi_inject_dsdt(ctx);
if (ret)
return log_msg_ret("inject", ret);
log_debug("Added %lx bytes from inject_dsdt, now at %p\n",
(ulong)(ctx->current - base), ctx->current);
log_debug("Copy AML code size %x to %p\n", aml_len,
ctx->current);
memcpy(ctx->current, AmlCode + thl, aml_len);
acpi_inc(ctx, aml_len);
}
ctx->dsdt = dsdt;
dsdt->length = ctx->current - (void *)dsdt;
log_debug("Updated DSDT length to %x\n", dsdt->length);
return 0;
}
ACPI_WRITER(3dsdt, "DSDT", acpi_write_dsdt, 0);
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