Add a new file to handle generating ACPI code programatically. This is used when information must be dynamically added to the tables, e.g. the SSDT.
Initial support is just for writing simple values. Also add a 'base' value so that the table can be freed. This likely doesn't happen in normal code, but is nice to do in tests.
Reviewed-by: Wolfgang Wallner wolfgang.wallner@br-automation.com Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v4: - Setup ctx->base as well as ctx->current in acpi_setup_base_tables() - Add a comment about little-endian in acpigen_emit_dword() - Add a #define for the context size in alloc_context()
Changes in v2: - Update to add a new 'base' field to struct acpi_ctx - Free the memory allocated to the table and context
include/acpi/acpigen.h | 49 ++++++++++++++++++++++++++++ include/dm/acpi.h | 2 ++ lib/acpi/Makefile | 1 + lib/acpi/acpi_table.c | 1 + lib/acpi/acpigen.c | 39 +++++++++++++++++++++++ test/dm/Makefile | 1 + test/dm/acpigen.c | 72 ++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 165 insertions(+) create mode 100644 include/acpi/acpigen.h create mode 100644 lib/acpi/acpigen.c create mode 100644 test/dm/acpigen.c
diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h new file mode 100644 index 0000000000..8809cdb4e1 --- /dev/null +++ b/include/acpi/acpigen.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Core ACPI (Advanced Configuration and Power Interface) support + * + * Copyright 2019 Google LLC + * + * Modified from coreboot file acpigen.h + */ + +#ifndef __ACPI_ACPIGEN_H +#define __ACPI_ACPIGEN_H + +#include <linux/types.h> + +struct acpi_ctx; + +/** + * acpigen_get_current() - Get the current ACPI code output pointer + * + * @ctx: ACPI context pointer + * @return output pointer + */ +u8 *acpigen_get_current(struct acpi_ctx *ctx); + +/** + * acpigen_emit_byte() - Emit a byte to the ACPI code + * + * @ctx: ACPI context pointer + * @data: Value to output + */ +void acpigen_emit_byte(struct acpi_ctx *ctx, uint data); + +/** + * acpigen_emit_word() - Emit a 16-bit word to the ACPI code + * + * @ctx: ACPI context pointer + * @data: Value to output + */ +void acpigen_emit_word(struct acpi_ctx *ctx, uint data); + +/** + * acpigen_emit_dword() - Emit a 32-bit 'double word' to the ACPI code + * + * @ctx: ACPI context pointer + * @data: Value to output + */ +void acpigen_emit_dword(struct acpi_ctx *ctx, uint data); + +#endif diff --git a/include/dm/acpi.h b/include/dm/acpi.h index 7563a4c60a..696b1a96a0 100644 --- a/include/dm/acpi.h +++ b/include/dm/acpi.h @@ -29,6 +29,7 @@ * * This contains a few useful pieces of information used when writing * + * @base: Base address of ACPI tables * @current: Current address for writing * @rsdp: Pointer to the Root System Description Pointer, typically used when * adding a new table. The RSDP holds pointers to the RSDT and XSDT. @@ -36,6 +37,7 @@ * @xsdt: Pointer to the Extended System Description Table */ struct acpi_ctx { + void *base; void *current; struct acpi_rsdp *rsdp; struct acpi_rsdt *rsdt; diff --git a/lib/acpi/Makefile b/lib/acpi/Makefile index caae6c01bd..85a1f774ad 100644 --- a/lib/acpi/Makefile +++ b/lib/acpi/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0+ #
+obj-y += acpigen.o obj-y += acpi_device.o obj-y += acpi_table.o diff --git a/lib/acpi/acpi_table.c b/lib/acpi/acpi_table.c index 431776666e..acc55e7fad 100644 --- a/lib/acpi/acpi_table.c +++ b/lib/acpi/acpi_table.c @@ -237,6 +237,7 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start) { + ctx->base = start; ctx->current = start;
/* Align ACPI tables to 16 byte */ diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c new file mode 100644 index 0000000000..a42ae26494 --- /dev/null +++ b/lib/acpi/acpigen.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generation of ACPI (Advanced Configuration and Power Interface) tables + * + * Copyright 2019 Google LLC + * Mostly taken from coreboot + */ + +#define LOG_CATEGORY LOGC_ACPI + +#include <common.h> +#include <dm.h> +#include <acpi/acpigen.h> +#include <dm/acpi.h> + +u8 *acpigen_get_current(struct acpi_ctx *ctx) +{ + return ctx->current; +} + +void acpigen_emit_byte(struct acpi_ctx *ctx, uint data) +{ + *(u8 *)ctx->current++ = data; +} + +void acpigen_emit_word(struct acpi_ctx *ctx, uint data) +{ + acpigen_emit_byte(ctx, data & 0xff); + acpigen_emit_byte(ctx, (data >> 8) & 0xff); +} + +void acpigen_emit_dword(struct acpi_ctx *ctx, uint data) +{ + /* Output the value in little-endian format */ + acpigen_emit_byte(ctx, data & 0xff); + acpigen_emit_byte(ctx, (data >> 8) & 0xff); + acpigen_emit_byte(ctx, (data >> 16) & 0xff); + acpigen_emit_byte(ctx, (data >> 24) & 0xff); +} diff --git a/test/dm/Makefile b/test/dm/Makefile index 0d1c66fa1e..5641070ea1 100644 --- a/test/dm/Makefile +++ b/test/dm/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_UT_DM) += test-uclass.o obj-$(CONFIG_UT_DM) += core.o ifneq ($(CONFIG_SANDBOX),) obj-$(CONFIG_ACPIGEN) += acpi.o +obj-$(CONFIG_ACPIGEN) += acpigen.o obj-$(CONFIG_SOUND) += audio.o obj-$(CONFIG_BLK) += blk.o obj-$(CONFIG_BOARD) += board.o diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c new file mode 100644 index 0000000000..9ff9b68532 --- /dev/null +++ b/test/dm/acpigen.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Tests for ACPI code generation + * + * Copyright 2019 Google LLC + * Written by Simon Glass sjg@chromium.org + */ + +#include <common.h> +#include <dm.h> +#include <malloc.h> +#include <acpi/acpigen.h> +#include <asm/unaligned.h> +#include <dm/acpi.h> +#include <dm/test.h> +#include <test/ut.h> + +/* Maximum size of the ACPI context needed for most tests */ +#define ACPI_CONTEXT_SIZE 150 + +static int alloc_context(struct acpi_ctx **ctxp) +{ + struct acpi_ctx *ctx; + + *ctxp = NULL; + ctx = malloc(sizeof(*ctx)); + if (!ctx) + return -ENOMEM; + ctx->base = malloc(ACPI_CONTEXT_SIZE); + if (!ctx->base) { + free(ctx); + return -ENOMEM; + } + ctx->current = ctx->base; + *ctxp = ctx; + + return 0; +} + +static void free_context(struct acpi_ctx **ctxp) +{ + free((*ctxp)->base); + free(*ctxp); + *ctxp = NULL; +} + +/* Test emitting simple types and acpigen_get_current() */ +static int dm_test_acpi_emit_simple(struct unit_test_state *uts) +{ + struct acpi_ctx *ctx; + u8 *ptr; + + ut_assertok(alloc_context(&ctx)); + + ptr = acpigen_get_current(ctx); + acpigen_emit_byte(ctx, 0x23); + ut_asserteq(1, acpigen_get_current(ctx) - ptr); + ut_asserteq(0x23, *(u8 *)ptr); + + acpigen_emit_word(ctx, 0x1234); + ut_asserteq(3, acpigen_get_current(ctx) - ptr); + ut_asserteq(0x1234, get_unaligned((u16 *)(ptr + 1))); + + acpigen_emit_dword(ctx, 0x87654321); + ut_asserteq(7, acpigen_get_current(ctx) - ptr); + ut_asserteq(0x87654321, get_unaligned((u32 *)(ptr + 3))); + + free_context(&ctx); + + return 0; +} +DM_TEST(dm_test_acpi_emit_simple, 0);