Following patch adds dynamic ACPI AML code generator which can be used to
generate run-time ACPI ASL code.
Moreover it demonstrates its use on Asus M2V-MX SE where the SSDT table is
generated by new function k8acpi_write_vars (technically similar to
update_ssdt). But lot of nicer.
x
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3925 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
diff --git a/src/arch/i386/boot/acpigen.c b/src/arch/i386/boot/acpigen.c
new file mode 100644
index 0000000..203f5a0
--- /dev/null
+++ b/src/arch/i386/boot/acpigen.c
@@ -0,0 +1,138 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* how many nesting we support */
+#define ACPIGEN_LENSTACK_SIZE 10
+
+/* if you need to change this, change the acpigen_write_f and
+ acpigen_patch_len */
+
+#define ACPIGEN_MAXLEN 0xfff
+
+#include <string.h>
+#include <arch/acpigen.h>
+#include <console/console.h>
+
+static char *gencurrent;
+
+char *len_stack[ACPIGEN_LENSTACK_SIZE];
+int ltop = 0;
+
+static int acpigen_write_len_f()
+{
+ ASSERT(ltop < (ACPIGEN_LENSTACK_SIZE - 1))
+ len_stack[ltop++] = gencurrent;
+ acpigen_emit_byte(0);
+ acpigen_emit_byte(0);
+ return 2;
+}
+
+void acpigen_patch_len(int len)
+{
+ ASSERT(len <= ACPIGEN_MAXLEN)
+ ASSERT(ltop > 0)
+ char *p = len_stack[--ltop];
+ /* generate store length for 0xfff max */
+ p[0] = (0x40 | (len & 0xf));
+ p[1] = (len >> 4 & 0xff);
+
+}
+
+void acpigen_set_current(char *curr) {
+ gencurrent = curr;
+}
+
+char *acpigen_get_current(void) {
+ return gencurrent;
+}
+
+int acpigen_emit_byte(unsigned char b)
+{
+ (*gencurrent++) = b;
+ return 1;
+}
+
+int acpigen_write_package(int nr_el)
+{
+ int len;
+ /* package op */
+ acpigen_emit_byte(0x12);
+ len = acpigen_write_len_f();
+ acpigen_emit_byte(nr_el);
+ return len + 2;
+}
+
+int acpigen_write_byte(unsigned int data)
+{
+ /* byte op */
+ acpigen_emit_byte(0xa);
+ acpigen_emit_byte(data & 0xff);
+ return 2;
+}
+
+int acpigen_write_dword(unsigned int data)
+{
+ /* dword op */
+ acpigen_emit_byte(0xc);
+ acpigen_emit_byte(data & 0xff);
+ acpigen_emit_byte((data >> 8) & 0xff);
+ acpigen_emit_byte((data >> 16) & 0xff);
+ acpigen_emit_byte((data >> 24) & 0xff);
+ return 5;
+}
+
+int acpigen_write_name_byte(char *name, uint8_t val) {
+ int len;
+ len = acpigen_write_name(name);
+ len += acpigen_write_byte(val);
+ return len;
+}
+
+int acpigen_write_name_dword(char *name, uint32_t val) {
+ int len;
+ len = acpigen_write_name(name);
+ len += acpigen_write_dword(val);
+ return len;
+}
+
+int acpigen_emit_stream(char *data, int size) {
+ int i;
+ for (i = 0; i < size; i++) {
+ acpigen_emit_byte(data[i]);
+ }
+ return size;
+}
+
+int acpigen_write_name(char *name)
+{
+ int len = strlen(name);
+ /* name op */
+ acpigen_emit_byte(0x8);
+ acpigen_emit_stream(name, len);
+ return len + 1;
+}
+
+int acpigen_write_scope(char *name)
+{
+ int len;
+ /* scope op */
+ acpigen_emit_byte(0x10);
+ len = acpigen_write_len_f();
+ return len + acpigen_emit_stream(name, strlen(name)) + 1;
+}