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