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[PATCH v3 04/11] esp: consolidate esp_cmdfifo_pop() into esp_fifo_pop()
From: |
Mark Cave-Ayland |
Subject: |
[PATCH v3 04/11] esp: consolidate esp_cmdfifo_pop() into esp_fifo_pop() |
Date: |
Thu, 1 Apr 2021 08:49:26 +0100 |
Each FIFO currently has its own pop functions with the only difference being
the capacity check. The original reason for this was that the fifo8
implementation doesn't have a formal API for retrieving the FIFO capacity,
however there are multiple examples within QEMU where the capacity field is
accessed directly.
Change esp_fifo_pop() to access the FIFO capacity directly and then consolidate
esp_cmdfifo_pop() into esp_fifo_pop().
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
hw/scsi/esp.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 16aaf8be93..ce88866803 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -107,22 +107,13 @@ static void esp_fifo_push(Fifo8 *fifo, uint8_t val)
fifo8_push(fifo, val);
}
-static uint8_t esp_fifo_pop(ESPState *s)
+static uint8_t esp_fifo_pop(Fifo8 *fifo)
{
- if (fifo8_is_empty(&s->fifo)) {
+ if (fifo8_is_empty(fifo)) {
return 0;
}
- return fifo8_pop(&s->fifo);
-}
-
-static uint8_t esp_cmdfifo_pop(ESPState *s)
-{
- if (fifo8_is_empty(&s->cmdfifo)) {
- return 0;
- }
-
- return fifo8_pop(&s->cmdfifo);
+ return fifo8_pop(fifo);
}
static uint32_t esp_get_tc(ESPState *s)
@@ -159,9 +150,9 @@ static uint8_t esp_pdma_read(ESPState *s)
uint8_t val;
if (s->do_cmd) {
- val = esp_cmdfifo_pop(s);
+ val = esp_fifo_pop(&s->cmdfifo);
} else {
- val = esp_fifo_pop(s);
+ val = esp_fifo_pop(&s->fifo);
}
return val;
@@ -887,7 +878,7 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
qemu_log_mask(LOG_UNIMP, "esp: PIO data read not implemented\n");
s->rregs[ESP_FIFO] = 0;
} else {
- s->rregs[ESP_FIFO] = esp_fifo_pop(s);
+ s->rregs[ESP_FIFO] = esp_fifo_pop(&s->fifo);
}
val = s->rregs[ESP_FIFO];
break;
--
2.20.1
[PATCH v3 06/11] esp: ensure cmdfifo is not empty and current_dev is non-NULL, Mark Cave-Ayland, 2021/04/01
[PATCH v3 07/11] esp: don't underflow cmdfifo in do_cmd(), Mark Cave-Ayland, 2021/04/01