ACPI tables translator

Exposes x86 ACPI tables as a netfs on a mount point

* acpi: New directory.
* Makefile (prog-subdirs): Add acpi.
* hurd/hurd_types.h (FSTYPE_ACPI): New macro.

1 files changed, 76 insertions, 0 deletions

diff --git a/acpi/func_files.c b/acpi/func_files.c
new file mode 100644
index 00000000..371f989a
--- /dev/null
+++ b/acpi/func_files.c
@@ -0,0 +1,76 @@
+/*
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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 the GNU Hurd.  If not, see <<a rel="nofollow" href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
+*/
+
+/*
+ * Per-function files implementation.
+ *
+ * Implementation of all files repeated for each function.
+ */
+
+#include <func_files.h>
+#include <assert.h>
+
+/* Read an acpi table */
+error_t
+io_acpi_table (struct acpi_table *t, off_t offset, size_t *len, void *data)
+{
+  error_t err;
+  size_t datalen;
+
+  /* This should never happen */
+  assert_backtrace (t != 0);
+
+  datalen = t->datalen;
+
+  /* Don't exceed the size of the acpi table */
+  if (offset > datalen)
+    return EINVAL;
+  if ((offset + *len) > datalen)
+    *len = datalen - offset;
+
+  memcpy (data, t->data + offset, *len);
+
+  return err;
+}
+
+/* Read from an acpi table file */
+error_t
+io_acpi_file (struct acpifs_dirent *e, off_t offset, size_t *len,
+              void *data)
+{
+  size_t datalen;
+  struct acpi_table *table;
+
+  /* This should never happen */
+  assert_backtrace (e->acpitable != 0);
+
+  /* Get the table */
+  table = e->acpitable;
+
+  datalen = table->datalen;
+  /* Don't exceed the region size */
+  if (offset > datalen)
+    return EINVAL;
+  if ((offset + *len) > datalen)
+    *len = datalen - offset;
+
+  memcpy (data, table->data + offset, *len);
+
+  return 0;
+}