[Xen-devel] [PATCH 09/12 v3] xen/arm: vpl011: Add support for vuart in xenconsole

[Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>]

Xenconsole supports only PV console currently. This patch adds support
for vuart console, which allows emulated pl011 UART to be accessed
as a console.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
---

One review comment was to keep the vuart code under CONFIG_ARM64 && CONFIG_ACPI 
flags.
This code review could not be incorporated as I could not find out the 
appropriate flags
unders which this code can be kept. Are the CONFIG* flags exported to 
xenconsole?

 tools/console/daemon/io.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 9bb14de..19a2f35 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -115,6 +115,7 @@ struct console_data {
 };
 
 static int map_pvcon_ring_ref(struct console *, int );
+static int map_vuartcon_ring_ref(struct console *, int );
 
 static struct console_data console_data[] = {
 
@@ -124,6 +125,12 @@ static struct console_data console_data[] = {
                .mapfunc = map_pvcon_ring_ref,
                .mandatory = true
        },
+       {
+               .xsname = "/vuart/0",
+               .ttyname = "tty",
+               .mapfunc = map_vuartcon_ring_ref,
+               .mandatory = false
+       }
 };
 
 #define MAX_CONSOLE (sizeof(console_data)/sizeof(struct console_data))
@@ -751,6 +758,28 @@ out:
        return err;
 }
 
+static int map_vuartcon_ring_ref(struct console *con, int ring_ref)
+{
+       int err = 0;
+       struct domain *dom = con->d;
+
+       if (!con->interface) {
+               con->interface = xc_map_foreign_range(xc,
+                                                                               
          dom->domid,
+                                                                               
          XC_PAGE_SIZE,
+                                                                               
          PROT_READ|PROT_WRITE,
+                                                                               
          (unsigned long)ring_ref);
+               if (con->interface == NULL) {
+                       err = EINVAL;
+                       goto out;
+               }
+               con->ring_ref = ring_ref;
+       }
+
+out:
+       return err;
+}
+
 static int console_create_ring(struct console *con)
 {
        int err, remote_port, ring_ref;
-- 
2.7.4


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