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Diffstat (limited to 'hw/acpi/aml-build.c')
-rw-r--r--hw/acpi/aml-build.c96
1 files changed, 87 insertions, 9 deletions
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index b28c1f41a5..6a02474e17 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -23,6 +23,7 @@
#include <stdarg.h>
#include <assert.h>
#include <stdbool.h>
+#include <string.h>
#include "hw/acpi/aml-build.h"
GArray *build_alloc_array(void)
@@ -52,25 +53,102 @@ void build_append_array(GArray *array, GArray *val)
#define ACPI_NAMESEG_LEN 4
-void GCC_FMT_ATTR(2, 3)
-build_append_nameseg(GArray *array, const char *format, ...)
+static void
+build_append_nameseg(GArray *array, const char *seg)
{
/* It would be nicer to use g_string_vprintf but it's only there in 2.22 */
- char s[] = "XXXX";
int len;
- va_list args;
-
- va_start(args, format);
- len = vsnprintf(s, sizeof s, format, args);
- va_end(args);
+ len = strlen(seg);
assert(len <= ACPI_NAMESEG_LEN);
- g_array_append_vals(array, s, len);
+ g_array_append_vals(array, seg, len);
/* Pad up to ACPI_NAMESEG_LEN characters if necessary. */
g_array_append_vals(array, "____", ACPI_NAMESEG_LEN - len);
}
+static void
+build_append_namestringv(GArray *array, const char *format, va_list ap)
+{
+ /* It would be nicer to use g_string_vprintf but it's only there in 2.22 */
+ char *s;
+ int len;
+ va_list va_len;
+ char **segs;
+ char **segs_iter;
+ int seg_count = 0;
+
+ va_copy(va_len, ap);
+ len = vsnprintf(NULL, 0, format, va_len);
+ va_end(va_len);
+ len += 1;
+ s = g_new(typeof(*s), len);
+
+ len = vsnprintf(s, len, format, ap);
+
+ segs = g_strsplit(s, ".", 0);
+ g_free(s);
+
+ /* count segments */
+ segs_iter = segs;
+ while (*segs_iter) {
+ ++segs_iter;
+ ++seg_count;
+ }
+ /*
+ * ACPI 5.0 spec: 20.2.2 Name Objects Encoding:
+ * "SegCount can be from 1 to 255"
+ */
+ assert(seg_count > 0 && seg_count <= 255);
+
+ /* handle RootPath || PrefixPath */
+ s = *segs;
+ while (*s == '\\' || *s == '^') {
+ build_append_byte(array, *s);
+ ++s;
+ }
+
+ switch (seg_count) {
+ case 1:
+ if (!*s) {
+ build_append_byte(array, 0x0); /* NullName */
+ } else {
+ build_append_nameseg(array, s);
+ }
+ break;
+
+ case 2:
+ build_append_byte(array, 0x2E); /* DualNamePrefix */
+ build_append_nameseg(array, s);
+ build_append_nameseg(array, segs[1]);
+ break;
+ default:
+ build_append_byte(array, 0x2F); /* MultiNamePrefix */
+ build_append_byte(array, seg_count);
+
+ /* handle the 1st segment manually due to prefix/root path */
+ build_append_nameseg(array, s);
+
+ /* add the rest of segments */
+ segs_iter = segs + 1;
+ while (*segs_iter) {
+ build_append_nameseg(array, *segs_iter);
+ ++segs_iter;
+ }
+ break;
+ }
+ g_strfreev(segs);
+}
+
+void build_append_namestring(GArray *array, const char *format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ build_append_namestringv(array, format, ap);
+ va_end(ap);
+}
+
/* 5.4 Definition Block Encoding */
enum {
PACKAGE_LENGTH_1BYTE_SHIFT = 6, /* Up to 63 - use extra 2 bits. */