acpi: Link translator to libacpica and provide RPCs

Provides two new acpi RPCs to sleep the machine and
to get the irq of any pci device.  ACPI mode is enabled
by default when the translator is started.

NB: Merging this commit means libacpica is a build dep.
Message-Id: <20220912103837.556815-2-damien@zamaudio.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/acpi/acpi-ops.c b/acpi/acpi-ops.c
new file mode 100644
index 00000000..3bc90de7
--- /dev/null
+++ b/acpi/acpi-ops.c
@@ -0,0 +1,86 @@
+/*
+   Copyright (C) 2021 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 <http://www.gnu.org/licenses/>.
+*/
+
+/* Implementation of ACPI operations */
+
+#include <acpi_S.h>
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/io.h>
+#include <idvec.h>
+
+#include <acpi/acpi_init.h>
+#include "acpifs.h"
+
+static error_t
+check_permissions (struct protid *master, int flags)
+{
+  struct node *node;
+  struct acpifs_dirent *e;
+
+  node = master->po->np;
+  e = node->nn->ln;
+
+  /* Check whether the user has permissions to access this node */
+  return entry_check_perms (master->user, e, flags);
+}
+
+error_t
+S_acpi_sleep (struct protid *master,
+	      int sleep_state)
+{
+  error_t err;
+
+  if (!master)
+    return EOPNOTSUPP;
+
+  if (!master->user)
+    return EOPNOTSUPP;
+
+  if (!idvec_contains (master->user->uids, 0))
+    return EOPNOTSUPP;
+
+  /* Perform sleep */
+  acpi_enter_sleep(sleep_state);
+
+  /* Never reached */
+  return err;
+}
+
+error_t
+S_acpi_get_pci_irq (struct protid *master,
+		    int bus,
+		    int dev,
+		    int func,
+		    int *irq)
+{
+  error_t err;
+
+  if (!master)
+    return EOPNOTSUPP;
+
+  err = check_permissions (master, O_READ);
+  if (err)
+    return err;
+
+  *irq = acpi_get_irq_number(bus, dev, func);
+  return err;
+}