x86: Record the start and end of the tables

The ACPI tables are special in that they are passed to EFI as a separate
piece, independent of other tables.

Also they can be spread over two areas of memory, e.g. with QEMU we end
up with tables kept in high memory as well.

Add new global_data fields to hold this information and update the bdinfo
command to show the table areas.

Move the rom_table_end variable into the loop that uses it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

5 files changed, 40 insertions, 1 deletions

diff --git a/arch/sandbox/include/asm/global_data.h b/arch/sandbox/include/asm/global_data.h
index f4ce72d..f0ab3ba 100644
--- a/arch/sandbox/include/asm/global_data.h
+++ b/arch/sandbox/include/asm/global_data.h
@@ -13,6 +13,10 @@
 struct arch_global_data {
 	uint8_t		*ram_buf;	/* emulated RAM buffer */
 	void		*text_base;	/* pointer to base of text region */
+	ulong table_start;		/* Start address of x86 tables */
+	ulong table_end;		/* End address of x86 tables */
+	ulong table_start_high;		/* Start address of high x86 tables */
+	ulong table_end_high;		/* End address of high x86 tables */
 };
 
 #include <asm-generic/global_data.h>
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 22d103d..ea58259 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -123,6 +123,10 @@ struct arch_global_data {
 #endif
 	void *itss_priv;		/* Private ITSS data pointer */
 	ulong coreboot_table;		/* Address of coreboot table */
+	ulong table_start;		/* Start address of x86 tables */
+	ulong table_end;		/* End address of x86 tables */
+	ulong table_start_high;		/* Start address of high x86 tables */
+	ulong table_end_high;		/* End address of high x86 tables */
 };
 
 #endif
diff --git a/arch/x86/lib/bdinfo.c b/arch/x86/lib/bdinfo.c
index a20d095..1240584 100644
--- a/arch/x86/lib/bdinfo.c
+++ b/arch/x86/lib/bdinfo.c
@@ -23,6 +23,10 @@ void arch_print_bdinfo(void)
 	bdinfo_print_str(" name", cpu_vendor_name(gd->arch.x86_vendor));
 	bdinfo_print_num_l("model", gd->arch.x86_model);
 	bdinfo_print_num_l("phys_addr in bits", cpu_phys_address_size());
+	bdinfo_print_num_l("table start", gd->arch.table_start);
+	bdinfo_print_num_l("table end", gd->arch.table_end);
+	bdinfo_print_num_l(" high start", gd->arch.table_start_high);
+	bdinfo_print_num_l(" high end", gd->arch.table_end_high);
 
 	if (IS_ENABLED(CONFIG_EFI_STUB))
 		efi_show_bdinfo();
diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
index 772c04f..67bc0a7 100644
--- a/arch/x86/lib/tables.c
+++ b/arch/x86/lib/tables.c
@@ -54,6 +54,10 @@ static struct table_info table_list[] = {
 #ifdef CONFIG_GENERATE_MP_TABLE
 	{ "mp", write_mp_table, },
 #endif
+	/*
+	 * tables which can go in the bloblist must be last in this list, so
+	 * that the calculation of gd->table_end works properly
+	 */
 #ifdef CONFIG_GENERATE_ACPI_TABLE
 	{ "acpi", write_acpi_tables, BLOBLISTT_ACPI_TABLES, 0x10000, 0x1000},
 #endif
@@ -80,10 +84,12 @@ int write_tables(void)
 {
 	u32 high_table, table_size;
 	struct memory_area cfg_tables[ARRAY_SIZE(table_list) + 1];
+	bool use_high = false;
 	u32 rom_addr;
 	int i;
 
-	rom_addr = ROM_TABLE_ADDR;
+	gd->arch.table_start = ROM_TABLE_ADDR;
+	rom_addr = gd->arch.table_start;
 
 	debug("Writing tables to %x:\n", rom_addr);
 	for (i = 0; i < ARRAY_SIZE(table_list); i++) {
@@ -92,10 +98,17 @@ int write_tables(void)
 		u32 rom_table_end;
 
 		if (IS_ENABLED(CONFIG_BLOBLIST_TABLES) && table->tag) {
+			if (!gd->arch.table_end)
+				gd->arch.table_end = rom_addr;
 			rom_addr = (ulong)bloblist_add(table->tag, size,
 						       table->align);
 			if (!rom_addr)
 				return log_msg_ret("bloblist", -ENOBUFS);
+
+			/* the bloblist is always in high memory */
+			use_high = true;
+			if (!gd->arch.table_start_high)
+				gd->arch.table_start_high = rom_addr;
 		}
 		rom_table_end = table->write(rom_addr);
 		if (!rom_table_end) {
@@ -132,6 +145,11 @@ int write_tables(void)
 		rom_addr = rom_table_end;
 	}
 
+	if (use_high)
+		gd->arch.table_end_high = rom_addr;
+	else
+		gd->arch.table_end = rom_addr;
+
 	if (IS_ENABLED(CONFIG_SEABIOS)) {
 		/* make sure the last item is zero */
 		cfg_tables[i].size = 0;
diff --git a/drivers/misc/qfw.c b/drivers/misc/qfw.c
index 0a93fee..7c01bf2 100644
--- a/drivers/misc/qfw.c
+++ b/drivers/misc/qfw.c
@@ -65,6 +65,11 @@ static int bios_linker_allocate(struct udevice *dev,
 			printf("error: allocating resource\n");
 			return -ENOMEM;
 		}
+		if (aligned_addr < gd->arch.table_start_high)
+			gd->arch.table_start_high = aligned_addr;
+		if (aligned_addr + size > gd->arch.table_end_high)
+			gd->arch.table_end_high = aligned_addr + size;
+
 	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
 		aligned_addr = ALIGN(*addr, align);
 	} else {
@@ -189,6 +194,10 @@ ulong write_acpi_tables(ulong addr)
 		return addr;
 	}
 
+	/* QFW always puts tables at high addresses */
+	gd->arch.table_start_high = (ulong)table_loader;
+	gd->arch.table_end_high = (ulong)table_loader;
+
 	qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size, table_loader);
 
 	for (i = 0; i < (size / sizeof(*entry)); i++) {