[PATCH v6 14/37] efi_loader: Allocate and write ACPI tables

[Patrick Rudolph <patrick.rudolph@9elements.com>]

Allocate memory for ACPI tables inside the efi_loader and write out
the tables similar to SMBIOS tables. When ACPI is enabled and wasn't
installed in other places, install the ACPI table in EFI. Since EFI
is necessary to pass the ACPI table location when FDT isn't used,
there's no need to install it separately.

When CONFIG_BLOBLIST_TABLES is set the tables will be stored in a
bloblist. The tables are still passed to the OS using EFI.

This allows non x86 platforms to boot using ACPI only in case the
EFI loader is being used.

TEST: Booted QEMU SBSA (no QFW) using EFI and ACPI only.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
---
Changelog v3:
- Drop memalign and use efi_allocate_pages
- Use log_debug instead of debug
- Clarify commit message
- Skip writing ACPI tables on sandbox
- Rename function
- Add function comment

Changelog v6:
- Update header order

---
 lib/efi_loader/efi_acpi.c        | 76 ++++++++++++++++++++++++++++++++
 test/py/tests/test_event_dump.py |  1 +
 2 files changed, 77 insertions(+)

diff --git a/lib/efi_loader/efi_acpi.c b/lib/efi_loader/efi_acpi.c
index 67bd7f8ca2..c11abe17b6 100644
--- a/lib/efi_loader/efi_acpi.c
+++ b/lib/efi_loader/efi_acpi.c
@@ -6,15 +6,23 @@
  */
 
 #include <efi_loader.h>
+#include <bloblist.h>
 #include <log.h>
+#include <malloc.h>
 #include <mapmem.h>
 #include <acpi/acpi_table.h>
 #include <asm/global_data.h>
+#include <asm/io.h>
+#include <linux/sizes.h>
+#include <linux/log2.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
 static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
 
+enum {
+	TABLE_SIZE	= SZ_64K,
+};
 /*
  * Install the ACPI table as a configuration table.
  *
@@ -47,3 +55,71 @@ efi_status_t efi_acpi_register(void)
 	return efi_install_configuration_table(&acpi_guid,
 					       (void *)(ulong)addr);
 }
+
+/*
+ * Allocate memory for ACPI tables and write ACPI tables to the
+ * allocated buffer.
+ *
+ * Return:	status code
+ */
+static int alloc_write_acpi_tables(void)
+{
+	u64 table_addr, table_end;
+	u64 new_acpi_addr = 0;
+	efi_uintn_t pages;
+	efi_status_t ret;
+	void *addr;
+
+	if (!IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE))
+		return 0;
+
+	if (IS_ENABLED(CONFIG_X86) ||
+	    IS_ENABLED(CONFIG_QFW_ACPI) ||
+	    IS_ENABLED(CONFIG_SANDBOX)) {
+		log_debug("Skipping writing ACPI tables as already done\n");
+		return 0;
+	}
+
+	/* Align the table to a 4KB boundary to keep EFI happy */
+	if (IS_ENABLED(CONFIG_BLOBLIST_TABLES)) {
+		addr = bloblist_add(BLOBLISTT_ACPI_TABLES, TABLE_SIZE,
+				    ilog2(SZ_4K));
+
+		if (!addr)
+			return log_msg_ret("mem", -ENOMEM);
+	} else {
+		pages = efi_size_in_pages(TABLE_SIZE);
+
+		ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+					 EFI_ACPI_RECLAIM_MEMORY,
+					 pages, &new_acpi_addr);
+		if (ret != EFI_SUCCESS)
+			return log_msg_ret("mem", -ENOMEM);
+
+		addr = (void *)(uintptr_t)new_acpi_addr;
+	}
+
+	table_addr = virt_to_phys(addr);
+
+	gd->arch.table_start_high = table_addr;
+
+	table_end = write_acpi_tables(table_addr);
+	if (!table_end) {
+		log_err("Can't create ACPI configuration table\n");
+		return -EINTR;
+	}
+
+	log_debug("- wrote 'acpi' to %llx, end %llx\n", table_addr, table_end);
+	if (table_end - table_addr > TABLE_SIZE) {
+		log_err("Out of space for configuration tables: need %llx, have %x\n",
+			table_end - table_addr, TABLE_SIZE);
+		return log_msg_ret("acpi", -ENOSPC);
+	}
+	gd->arch.table_end_high = table_end;
+
+	log_debug("- done writing tables\n");
+
+	return 0;
+}
+
+EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, alloc_write_acpi_tables);
diff --git a/test/py/tests/test_event_dump.py b/test/py/tests/test_event_dump.py
index e282c67335..459bfa26bb 100644
--- a/test/py/tests/test_event_dump.py
+++ b/test/py/tests/test_event_dump.py
@@ -18,6 +18,7 @@ def test_event_dump(u_boot_console):
 --------------------  ------------------------------  ------------------------------
 EVT_FT_FIXUP          bootmeth_vbe_ft_fixup           .*boot/vbe_request.c:.*
 EVT_FT_FIXUP          bootmeth_vbe_simple_ft_fixup    .*boot/vbe_simple_os.c:.*
+EVT_LAST_STAGE_INIT   alloc_write_acpi_tables         .*lib/efi_loader/efi_acpi.c:.*
 EVT_LAST_STAGE_INIT   install_smbios_table            .*lib/efi_loader/efi_smbios.c:.*
 EVT_MISC_INIT_F       sandbox_early_getopt_check      .*arch/sandbox/cpu/start.c:.*
 EVT_TEST              h_adder_simple                  .*test/common/event.c:'''
-- 
2.46.2