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7e148f2ed3
It is convenient to write a length value for preceding a block of data. Of course the length is not known or is hard to calculate a priori. So add a way to mark the start on a stack, so the length can be updated when known. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generation of ACPI (Advanced Configuration and Power Interface) tables
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*
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* Copyright 2019 Google LLC
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* Mostly taken from coreboot
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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 <dm.h>
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#include <log.h>
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#include <acpi/acpigen.h>
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#include <dm/acpi.h>
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u8 *acpigen_get_current(struct acpi_ctx *ctx)
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{
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return ctx->current;
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}
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void acpigen_emit_byte(struct acpi_ctx *ctx, uint data)
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{
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*(u8 *)ctx->current++ = data;
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}
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void acpigen_emit_word(struct acpi_ctx *ctx, uint data)
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{
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acpigen_emit_byte(ctx, data & 0xff);
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acpigen_emit_byte(ctx, (data >> 8) & 0xff);
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}
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void acpigen_emit_dword(struct acpi_ctx *ctx, uint data)
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{
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/* Output the value in little-endian format */
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acpigen_emit_byte(ctx, data & 0xff);
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acpigen_emit_byte(ctx, (data >> 8) & 0xff);
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acpigen_emit_byte(ctx, (data >> 16) & 0xff);
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acpigen_emit_byte(ctx, (data >> 24) & 0xff);
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}
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/*
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* Maximum length for an ACPI object generated by this code,
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*
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* If you need to change this, change acpigen_write_len_f(ctx) and
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* acpigen_pop_len(ctx)
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*/
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#define ACPIGEN_MAXLEN 0xfffff
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void acpigen_write_len_f(struct acpi_ctx *ctx)
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{
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assert(ctx->ltop < (ACPIGEN_LENSTACK_SIZE - 1));
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ctx->len_stack[ctx->ltop++] = ctx->current;
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acpigen_emit_byte(ctx, 0);
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acpigen_emit_byte(ctx, 0);
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acpigen_emit_byte(ctx, 0);
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}
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void acpigen_pop_len(struct acpi_ctx *ctx)
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{
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int len;
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char *p;
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assert(ctx->ltop > 0);
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p = ctx->len_stack[--ctx->ltop];
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len = ctx->current - (void *)p;
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assert(len <= ACPIGEN_MAXLEN);
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/* generate store length for 0xfffff max */
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p[0] = ACPI_PKG_LEN_3_BYTES | (len & 0xf);
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p[1] = len >> 4 & 0xff;
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p[2] = len >> 12 & 0xff;
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}
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void acpigen_emit_stream(struct acpi_ctx *ctx, const char *data, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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acpigen_emit_byte(ctx, data[i]);
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}
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void acpigen_emit_string(struct acpi_ctx *ctx, const char *str)
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{
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acpigen_emit_stream(ctx, str, str ? strlen(str) : 0);
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acpigen_emit_byte(ctx, '\0');
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}
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