Initial import

1 files changed, 135 insertions, 0 deletions

diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
new file mode 100644
index 000000000..b9afb74b7
--- /dev/null
+++ b/arch/um/os-Linux/irq.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <poll.h>
+#include <signal.h>
+#include <string.h>
+#include <irq_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+/*
+ * Locked by irq_lock in arch/um/kernel/irq.c.  Changed by os_create_pollfd
+ * and os_free_irq_by_cb, which are called under irq_lock.
+ */
+static struct pollfd *pollfds = NULL;
+static int pollfds_num = 0;
+static int pollfds_size = 0;
+
+int os_waiting_for_events(struct irq_fd *active_fds)
+{
+	struct irq_fd *irq_fd;
+	int i, n, err;
+
+	n = poll(pollfds, pollfds_num, 0);
+	if (n < 0) {
+		err = -errno;
+		if (errno != EINTR)
+			printk(UM_KERN_ERR "os_waiting_for_events:"
+			       " poll returned %d, errno = %d\n", n, errno);
+		return err;
+	}
+
+	if (n == 0)
+		return 0;
+
+	irq_fd = active_fds;
+
+	for (i = 0; i < pollfds_num; i++) {
+		if (pollfds[i].revents != 0) {
+			irq_fd->current_events = pollfds[i].revents;
+			pollfds[i].fd = -1;
+		}
+		irq_fd = irq_fd->next;
+	}
+	return n;
+}
+
+int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
+{
+	if (pollfds_num == pollfds_size) {
+		if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
+			/* return min size needed for new pollfds area */
+			return (pollfds_size + 1) * sizeof(pollfds[0]);
+		}
+
+		if (pollfds != NULL) {
+			memcpy(tmp_pfd, pollfds,
+			       sizeof(pollfds[0]) * pollfds_size);
+			/* remove old pollfds */
+			kfree(pollfds);
+		}
+		pollfds = tmp_pfd;
+		pollfds_size++;
+	} else
+		kfree(tmp_pfd);	/* remove not used tmp_pfd */
+
+	pollfds[pollfds_num] = ((struct pollfd) { .fd		= fd,
+						  .events	= events,
+						  .revents	= 0 });
+	pollfds_num++;
+
+	return 0;
+}
+
+void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
+		struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
+{
+	struct irq_fd **prev;
+	int i = 0;
+
+	prev = &active_fds;
+	while (*prev != NULL) {
+		if ((*test)(*prev, arg)) {
+			struct irq_fd *old_fd = *prev;
+			if ((pollfds[i].fd != -1) &&
+			    (pollfds[i].fd != (*prev)->fd)) {
+				printk(UM_KERN_ERR "os_free_irq_by_cb - "
+				       "mismatch between active_fds and "
+				       "pollfds, fd %d vs %d\n",
+				       (*prev)->fd, pollfds[i].fd);
+				goto out;
+			}
+
+			pollfds_num--;
+
+			/*
+			 * This moves the *whole* array after pollfds[i]
+			 * (though it doesn't spot as such)!
+			 */
+			memmove(&pollfds[i], &pollfds[i + 1],
+			       (pollfds_num - i) * sizeof(pollfds[0]));
+			if (*last_irq_ptr2 == &old_fd->next)
+				*last_irq_ptr2 = prev;
+
+			*prev = (*prev)->next;
+			if (old_fd->type == IRQ_WRITE)
+				ignore_sigio_fd(old_fd->fd);
+			kfree(old_fd);
+			continue;
+		}
+		prev = &(*prev)->next;
+		i++;
+	}
+ out:
+	return;
+}
+
+int os_get_pollfd(int i)
+{
+	return pollfds[i].fd;
+}
+
+void os_set_pollfd(int i, int fd)
+{
+	pollfds[i].fd = fd;
+}
+
+void os_set_ioignore(void)
+{
+	signal(SIGIO, SIG_IGN);
+}