[PATCH v3 40/42] esp: add trivial implementation of the ESP_RFLAGS register

[Mark Cave-Ayland]

The bottom 5 bits contain the number of bytes remaining in the FIFO which is
trivial to implement with Fifo8 (the remaining bits are unimplemented and left
as 0 for now).

Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
Reviewed-by: Laurent Vivier <laur...@vivier.eu>
---
 hw/scsi/esp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 34dc58da58..8a9b1500de 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -818,6 +818,10 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
             val = s->rregs[saddr];
         }
         break;
+     case ESP_RFLAGS:
+        /* Bottom 5 bits indicate number of bytes in FIFO */
+        val = fifo8_num_used(&s->fifo);
+        break;
     default:
         val = s->rregs[saddr];
         break;
-- 
2.20.1