x86: acpi: Update acpi_fill_csrt() to use acpi_ctx

Update this function to the newer style, so we can avoid passing and
returning an address through this function.

Also move this function out of the x86 code so it can be used by other
archs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/arch/x86/cpu/tangier/acpi.c b/arch/x86/cpu/tangier/acpi.c
index 1187356..12f9289 100644
--- a/arch/x86/cpu/tangier/acpi.c
+++ b/arch/x86/cpu/tangier/acpi.c
@@ -109,11 +109,14 @@
 	return grp->length;
 }
 
-u32 acpi_fill_csrt(u32 current)
+int acpi_fill_csrt(struct acpi_ctx *ctx)
 {
-	current += acpi_fill_csrt_dma((struct acpi_csrt_group *)current);
+	int size;
+
+	size = acpi_fill_csrt_dma(ctx->current);
+	acpi_inc(ctx, size);
 
-	return current;
+	return 0;
 }
 
 int acpi_create_gnvs(struct acpi_global_nvs *gnvs)
diff --git a/arch/x86/include/asm/acpi_table.h b/arch/x86/include/asm/acpi_table.h
index fb60f85..0d07f7c 100644
--- a/arch/x86/include/asm/acpi_table.h
+++ b/arch/x86/include/asm/acpi_table.h
@@ -35,7 +35,6 @@
 int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
 			      u16 seg_nr, u8 start, u8 end);
 u32 acpi_fill_mcfg(u32 current);
-u32 acpi_fill_csrt(u32 current);
 
 /**
  * acpi_write_hpet() - Write out a HPET table
diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h
index fcc9caa..e405012 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -696,6 +696,18 @@
  */
 void acpi_fill_header(struct acpi_table_header *header, char *signature);
 
+/**
+ * acpi_fill_csrt() - Fill out the body of the CSRT
+ *
+ * This should write the contents of the Core System Resource Table (CSRT)
+ * to the context. The header (struct acpi_table_header) has already been
+ * written.
+ *
+ * @ctx: ACPI context to write to
+ * @return 0 if OK, -ve on error
+ */
+int acpi_fill_csrt(struct acpi_ctx *ctx);
+
 #endif /* !__ACPI__*/
 
 #include <asm/acpi_table.h>
diff --git a/lib/acpi/csrt.c b/lib/acpi/csrt.c
index 7606931..2ba86f2 100644
--- a/lib/acpi/csrt.c
+++ b/lib/acpi/csrt.c
@@ -13,7 +13,7 @@
 #include <acpi/acpi_table.h>
 #include <dm/acpi.h>
 
-__weak u32 acpi_fill_csrt(u32 current)
+__weak int acpi_fill_csrt(struct acpi_ctx *ctx)
 {
 	return 0;
 }
@@ -22,7 +22,7 @@
 {
 	struct acpi_table_header *header;
 	struct acpi_csrt *csrt;
-	uint ptr;
+	int ret;
 
 	csrt = ctx->current;
 	header = &csrt->header;
@@ -31,19 +31,18 @@
 
 	/* Fill out header fields */
 	acpi_fill_header(header, "CSRT");
-	header->length = sizeof(struct acpi_csrt);
 	header->revision = 0;
+	acpi_inc(ctx, sizeof(*header));
 
-	ptr = acpi_fill_csrt(map_to_sysmem(csrt));
-	if (!ptr)
-		return log_msg_ret("fill", -ENOENT);
+	ret = acpi_fill_csrt(ctx);
+	if (ret)
+		return log_msg_ret("fill", ret);
 
 	/* (Re)calculate length and checksum */
 	header->length = (ulong)ctx->current - (ulong)csrt;
 	header->checksum = table_compute_checksum(csrt, header->length);
 
 	acpi_add_table(ctx, csrt);
-	acpi_inc(ctx, csrt->header.length);
 
 	return 0;
 }