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[Qemu-devel] [PATCH v3 4/4] fdc: fix interrupt handling
From: |
Pavel Hrdina |
Subject: |
[Qemu-devel] [PATCH v3 4/4] fdc: fix interrupt handling |
Date: |
Tue, 12 Jun 2012 13:19:37 +0200 |
If you call the SENSE INTERRUPT STATUS commad while there is no interrupt
waiting you get as reasult unknown command.
Fixed status0 register handling for read/write/format commands.
Signed-off-by: Pavel Hrdina <address@hidden>
---
hw/fdc.c | 30 ++++++++++++++++--------------
1 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/hw/fdc.c b/hw/fdc.c
index b658504..1bc90c9 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -305,6 +305,7 @@ enum {
};
enum {
+ FD_SR0_HEAD = 0x04,
FD_SR0_EQPMT = 0x10,
FD_SR0_SEEK = 0x20,
FD_SR0_ABNTERM = 0x40,
@@ -970,14 +971,14 @@ static void fdctrl_reset_fifo(FDCtrl *fdctrl)
}
/* Set FIFO status for the host to read */
-static void fdctrl_set_fifo(FDCtrl *fdctrl, int fifo_len, int do_irq)
+static void fdctrl_set_fifo(FDCtrl *fdctrl, int fifo_len, uint8_t status0)
{
fdctrl->data_dir = FD_DIR_READ;
fdctrl->data_len = fifo_len;
fdctrl->data_pos = 0;
fdctrl->msr |= FD_MSR_CMDBUSY | FD_MSR_RQM | FD_MSR_DIO;
- if (do_irq)
- fdctrl_raise_irq(fdctrl, 0x00);
+ if (status0)
+ fdctrl_raise_irq(fdctrl, status0);
}
/* Set an error: unimplemented/unknown command */
@@ -1038,10 +1039,11 @@ static void fdctrl_stop_transfer(FDCtrl *fdctrl,
uint8_t status0,
FDrive *cur_drv;
cur_drv = get_cur_drv(fdctrl);
+ fdctrl->status0 = status0 | FD_SR0_SEEK | (cur_drv->head << 2) |
GET_CUR_DRV(fdctrl);
+
FLOPPY_DPRINTF("transfer status: %02x %02x %02x (%02x)\n",
- status0, status1, status2,
- status0 | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl));
- fdctrl->fifo[0] = status0 | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
+ status0, status1, status2, fdctrl->status0);
+ fdctrl->fifo[0] = fdctrl->status0;
fdctrl->fifo[1] = status1;
fdctrl->fifo[2] = status2;
fdctrl->fifo[3] = cur_drv->track;
@@ -1054,7 +1056,7 @@ static void fdctrl_stop_transfer(FDCtrl *fdctrl, uint8_t
status0,
}
fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
fdctrl->msr &= ~FD_MSR_NONDMA;
- fdctrl_set_fifo(fdctrl, 7, 1);
+ fdctrl_set_fifo(fdctrl, 7, fdctrl->status0);
}
/* Prepare a data transfer (either DMA or FIFO) */
@@ -1168,7 +1170,7 @@ static void fdctrl_start_transfer(FDCtrl *fdctrl, int
direction)
if (direction != FD_DIR_WRITE)
fdctrl->msr |= FD_MSR_DIO;
/* IO based transfer: calculate len */
- fdctrl_raise_irq(fdctrl, 0x00);
+ fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
return;
}
@@ -1596,16 +1598,16 @@ static void fdctrl_handle_sense_interrupt_status(FDCtrl
*fdctrl, int direction)
{
FDrive *cur_drv = get_cur_drv(fdctrl);
- if(fdctrl->reset_sensei > 0) {
+ if (fdctrl->reset_sensei > 0) {
fdctrl->fifo[0] =
FD_SR0_RDYCHG + FD_RESET_SENSEI_COUNT - fdctrl->reset_sensei;
fdctrl->reset_sensei--;
+ } else if (!(fdctrl->sra & FD_SRA_INTPEND)) {
+ fdctrl->fifo[0] = FD_SR0_INVCMD;
+ fdctrl_set_fifo(fdctrl, 1, 0);
+ return;
} else {
- /* XXX: status0 handling is broken for read/write
- commands, so we do this hack. It should be suppressed
- ASAP */
- fdctrl->fifo[0] =
- FD_SR0_SEEK | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
+ fdctrl->fifo[0] = (fdctrl->status0 & ~FD_SR0_HEAD) |
GET_CUR_DRV(fdctrl);
}
fdctrl->fifo[1] = cur_drv->track;
--
1.7.7.6