x86: acpi: Split out context creation from base tables

At present acpi_setup_base_tables() both sets up the ACPI context and
writes out the base tables.

We want to use an ACPI writer to write the base tables, so split this
function into two, with acpi_setup_ctx() doing the context set, and
acpi_setup_base_tables() just doing the base tables.

Disable the writer's write_acpi_tables() function for now, to avoid
build errors. It is enabled in a following patch.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/lib/acpi_table.c

@@ -522,17 +522,17 @@ ulong write_acpi_tables(ulong start_addr)
 	int ret;
 	int i;
 
-	ctx = calloc(1, sizeof(*ctx));
+	ctx = malloc(sizeof(*ctx));
 	if (!ctx)
 		return log_msg_ret("mem", -ENOMEM);
-	gd->acpi_ctx = ctx;
 
 	start = map_sysmem(start_addr, 0);
 
 	debug("ACPI: Writing ACPI tables at %lx\n", start_addr);
 
 	acpi_reset_items();
-	acpi_setup_base_tables(ctx, start);
+	acpi_setup_ctx(ctx, start);
+	acpi_setup_base_tables(ctx);
 
 	debug("ACPI:    * FACS\n");
 	facs = ctx->current;

include/acpi/acpi_table.h

@@ -679,14 +679,14 @@ void acpi_inc_align(struct acpi_ctx *ctx, uint amount);
 int acpi_add_table(struct acpi_ctx *ctx, void *table);
 
 /**
- * acpi_setup_base_tables() - Set up context along with RSDP, RSDT and XSDT
+ * acpi_setup_base_tables() - Set up base tables - RSDP, RSDT and XSDT
  *
- * Set up the context with the given start position. Some basic tables are
- * always needed, so set them up as well.
+ * Writes the basic tables to the given context, which must first be set up with
+ * acpi_setup_ctx().
  *
- * @ctx: Context to set up
+ * @ctx: Context to write base tables to
  */
-void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start);
+void acpi_setup_base_tables(struct acpi_ctx *ctx);
 
 /**
  * acpi_write_rsdp() - Write out an RSDP indicating where the ACPI tables are

include/dm/acpi.h

@@ -297,6 +297,18 @@ void acpi_reset_items(void);
  */
 int acpi_write_one(struct acpi_ctx *ctx, const struct acpi_writer *entry);
 
+/**
+ * acpi_setup_ctx() - Set up a new ACPI context
+ *
+ * This zeros the context and sets up the base and current pointers, ensuring
+ * that they are aligned. Then it writes the acpi_start and acpi_ctx values in
+ * global_data
+ *
+ * @ctx: ACPI context to set up
+ * @start: Start address for ACPI table
+ */
+void acpi_setup_ctx(struct acpi_ctx *ctx, ulong start);
+
 #endif /* __ACPI__ */
 
 #endif

lib/acpi/Makefile

@@ -5,3 +5,4 @@ obj-$(CONFIG_$(SPL_)ACPIGEN) += acpigen.o
 obj-$(CONFIG_$(SPL_)ACPIGEN) += acpi_device.o
 obj-$(CONFIG_$(SPL_)ACPIGEN) += acpi_dp.o
 obj-$(CONFIG_$(SPL_)ACPIGEN) += acpi_table.o
+obj-y += acpi_writer.o

lib/acpi/acpi_table.c

@@ -253,15 +253,8 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
 						  sizeof(struct acpi_xsdt));
 }
 
-void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
+void acpi_setup_base_tables(struct acpi_ctx *ctx)
 {
-	ctx->base = start;
-	ctx->current = start;
-
-	/* Align ACPI tables to 16 byte */
-	acpi_align(ctx);
-	gd_set_acpi_start(map_to_sysmem(ctx->current));
-
 	/* We need at least an RSDP and an RSDT Table */
 	ctx->rsdp = ctx->current;
 	acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
@@ -271,7 +264,7 @@ void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
 	acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
 
 	/* clear all table memory */
-	memset((void *)start, '\0', ctx->current - start);
+	memset(ctx->base, '\0', ctx->current - ctx->base);
 
 	acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
 	acpi_write_rsdt(ctx->rsdt);

lib/acpi/acpi_writer.c

@@ -60,23 +60,20 @@ static int acpi_write_all(struct acpi_ctx *ctx)
 /*
  * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
  */
-ulong write_acpi_tables(ulong start_addr)
+ulong new_write_acpi_tables(ulong start_addr)
 {
 	struct acpi_ctx *ctx;
 	ulong addr;
-	void *start;
 	int ret;
 
-	ctx = calloc(1, sizeof(*ctx));
+	ctx = malloc(sizeof(*ctx));
 	if (!ctx)
 		return log_msg_ret("mem", -ENOMEM);
-	gd->acpi_ctx = ctx;
-
-	start = map_sysmem(start_addr, 0);
 
 	log_debug("ACPI: Writing ACPI tables at %lx\n", start_addr);
 
 	acpi_reset_items();
+	acpi_setup_ctx(ctx, start_addr);
 
 	ret = acpi_write_all(ctx);
 	if (ret) {
@@ -89,3 +86,16 @@ ulong write_acpi_tables(ulong start_addr)
 
 	return addr;
 }
+
+void acpi_setup_ctx(struct acpi_ctx *ctx, ulong start)
+{
+	gd->acpi_ctx = ctx;
+	memset(ctx, '\0', sizeof(*ctx));
+
+	/* Align ACPI tables to 16-byte boundary */
+	start = ALIGN(start, 16);
+	ctx->base = map_sysmem(start, 0);
+	ctx->current = ctx->base;
+
+	gd_set_acpi_start(start);
+}

test/dm/acpi.c

@@ -45,6 +45,22 @@ struct testacpi_plat {
 	bool no_name;
 };
 
+/**
+ * setup_ctx_and_base_tables() - Set up context along with RSDP, RSDT and XSDT
+ *
+ * Set up the context with the given start position. Some basic tables are
+ * always needed, so set them up as well.
+ *
+ * @ctx: Context to set up
+ */
+static int setup_ctx_and_base_tables(struct acpi_ctx *ctx, ulong start)
+{
+	acpi_setup_ctx(ctx, start);
+	acpi_setup_base_tables(ctx);
+
+	return 0;
+}
+
 static int testacpi_write_tables(const struct udevice *dev,
 				 struct acpi_ctx *ctx)
 {
@@ -240,13 +256,15 @@ static int dm_test_acpi_write_tables(struct unit_test_state *uts)
 {
 	struct acpi_dmar *dmar;
 	struct acpi_ctx ctx;
+	ulong addr;
 	void *buf;
 	int i;
 
 	buf = malloc(BUF_SIZE);
 	ut_assertnonnull(buf);
+	addr = map_to_sysmem(buf);
 
-	acpi_setup_base_tables(&ctx, buf);
+	setup_ctx_and_base_tables(&ctx, addr);
 	dmar = ctx.current;
 	ut_assertok(acpi_write_dev_tables(&ctx));
 
@@ -312,6 +330,7 @@ static int dm_test_acpi_setup_base_tables(struct unit_test_state *uts)
 	struct acpi_xsdt *xsdt;
 	struct acpi_ctx ctx;
 	void *buf, *end;
+	ulong addr;
 
 	/*
 	 * Use an unaligned address deliberately, by allocating an aligned
@@ -319,7 +338,8 @@ static int dm_test_acpi_setup_base_tables(struct unit_test_state *uts)
 	 */
 	buf = memalign(64, BUF_SIZE);
 	ut_assertnonnull(buf);
-	acpi_setup_base_tables(&ctx, buf + 4);
+	addr = map_to_sysmem(buf);
+	setup_ctx_and_base_tables(&ctx, addr + 4);
 	ut_asserteq(map_to_sysmem(PTR_ALIGN(buf + 4, 16)), gd_acpi_start());
 
 	rsdp = buf + 16;
@@ -361,13 +381,13 @@ static int dm_test_acpi_cmd_list(struct unit_test_state *uts)
 
 	buf = memalign(16, BUF_SIZE);
 	ut_assertnonnull(buf);
-	acpi_setup_base_tables(&ctx, buf);
+	addr = map_to_sysmem(buf);
+	setup_ctx_and_base_tables(&ctx, addr);
 
 	ut_assertok(acpi_write_dev_tables(&ctx));
 
 	console_record_reset();
 	run_command("acpi list", 0);
-	addr = (ulong)map_to_sysmem(buf);
 	ut_assert_nextline("ACPI tables start at %lx", addr);
 	ut_assert_nextline("RSDP %08lx %06zx (v02 U-BOOT)", addr,
 			   sizeof(struct acpi_rsdp));
@@ -403,7 +423,8 @@ static int dm_test_acpi_cmd_dump(struct unit_test_state *uts)
 
 	buf = memalign(16, BUF_SIZE);
 	ut_assertnonnull(buf);
-	acpi_setup_base_tables(&ctx, buf);
+	addr = map_to_sysmem(buf);
+	setup_ctx_and_base_tables(&ctx, addr);
 
 	ut_assertok(acpi_write_dev_tables(&ctx));