From f3aa88a51cefc12da3304cd827bbfd6e7fcbfe76 Mon Sep 17 00:00:00 2001
From: Arthur Heymans <arthur@aheymans.xyz>
Date: Thu, 22 Jun 2023 21:41:51 +0200
Subject: arch/arm64: Hook up ACPI table generation

Linux v6.3.5 is able to detect and use ACPI tables on an out of tree
target using hacked version of u-boot to pass ACPI through UEFI.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I4f60c546ec262ffb4d447fe6476844cf5a1b756d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76071
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
---
 src/acpi/Kconfig        |  6 ++++++
 src/arch/arm64/tables.c | 19 +++++++++++++++++--
 src/arch/x86/Kconfig    |  6 ------
 3 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/src/acpi/Kconfig b/src/acpi/Kconfig
index b72d2c63e7a2..dc57fef05e2b 100644
--- a/src/acpi/Kconfig
+++ b/src/acpi/Kconfig
@@ -81,3 +81,9 @@ config ACPI_GTDT
 	depends on HAVE_ACPI_TABLES
 	help
 	  Selected by platforms that implement ARM generic timers
+
+config MAX_ACPI_TABLE_SIZE_KB
+	int
+	default 144
+	help
+	  Set the maximum size of all ACPI tables in KiB.
diff --git a/src/arch/arm64/tables.c b/src/arch/arm64/tables.c
index b97297c1b9a6..c66612b7f2c1 100644
--- a/src/arch/arm64/tables.c
+++ b/src/arch/arm64/tables.c
@@ -1,12 +1,27 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <bootmem.h>
-#include <boot/tables.h>
+#include <acpi/acpi.h>
+#include <assert.h>
 #include <boot/coreboot_tables.h>
+#include <boot/tables.h>
+#include <bootmem.h>
+#include <cbmem.h>
 #include <symbols.h>
 
+static void write_acpi_table(void)
+{
+	const size_t max_acpi_size = CONFIG_MAX_ACPI_TABLE_SIZE_KB * KiB;
+	const uintptr_t acpi_start = (uintptr_t)cbmem_add(CBMEM_ID_ACPI, max_acpi_size);
+	assert(IS_ALIGNED(acpi_start, 16));
+	const uintptr_t acpi_end = write_acpi_tables(acpi_start);
+	assert(acpi_end < acpi_start + max_acpi_size);
+	printk(BIOS_DEBUG, "ACPI tables: %ld bytes.\n", acpi_end - acpi_start);
+}
+
 void arch_write_tables(uintptr_t coreboot_table)
 {
+	if (CONFIG(HAVE_ACPI_TABLES))
+		write_acpi_table();
 }
 
 void bootmem_arch_add_ranges(void)
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index ec1171b505b8..8676fad863de 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -298,12 +298,6 @@ config MAX_PIRQ_LINKS
 	  table specifies links greater than 4, pirq_route_irqs will not
 	  function properly, unless this variable is correctly set.
 
-config MAX_ACPI_TABLE_SIZE_KB
-	int
-	default 144
-	help
-	  Set the maximum size of all ACPI tables in KiB.
-
 config MEMLAYOUT_LD_FILE
 	string
 	default "src/arch/x86/memlayout.ld"
-- 
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