From 5b0a25e8d2f15f89255c745c71d297b5b24d138c Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 21 May 2015 15:19:34 +0200 Subject: [PATCH] fdc: Use phase in fdctrl_write_data() Instead of relying on a flag in the MSR to distinguish controller phases, use the explicit phase that we store now. Assertions of the right MSR flags are added. Signed-off-by: Kevin Wolf Reviewed-by: John Snow Message-id: 1432214378-31891-5-git-send-email-kwolf@redhat.com Signed-off-by: John Snow --- hw/block/fdc.c | 69 ++++++++++++++++++++++++++++++++++------------------------ 1 file changed, 41 insertions(+), 28 deletions(-) diff --git a/hw/block/fdc.c b/hw/block/fdc.c index f5bcf0b145..e3515a1bf8 100644 --- a/hw/block/fdc.c +++ b/hw/block/fdc.c @@ -2059,8 +2059,12 @@ static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value) return; } fdctrl->dsr &= ~FD_DSR_PWRDOWN; - /* Is it write command time ? */ - if (fdctrl->msr & FD_MSR_NONDMA) { + + switch (fdctrl->phase) { + case FD_PHASE_EXECUTION: + /* For DMA requests, RQM should be cleared during execution phase, so + * we would have errored out above. */ + assert(fdctrl->msr & FD_MSR_NONDMA); /* FIFO data write */ pos = fdctrl->data_pos++; pos %= FD_SECTOR_LEN; @@ -2072,12 +2076,12 @@ static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value) < 0) { FLOPPY_DPRINTF("error writing sector %d\n", fd_sector(cur_drv)); - return; + break; } if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) { FLOPPY_DPRINTF("error seeking to next sector %d\n", fd_sector(cur_drv)); - return; + break; } } /* Switch from transfer mode to status mode @@ -2085,33 +2089,42 @@ static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value) */ if (fdctrl->data_pos == fdctrl->data_len) fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00); - return; - } - if (fdctrl->data_pos == 0) { - /* Command */ - pos = command_to_handler[value & 0xff]; - FLOPPY_DPRINTF("%s command\n", handlers[pos].name); - fdctrl->data_len = handlers[pos].parameters + 1; - fdctrl->msr |= FD_MSR_CMDBUSY; - } + break; - FLOPPY_DPRINTF("%s: %02x\n", __func__, value); - pos = fdctrl->data_pos++; - pos %= FD_SECTOR_LEN; - fdctrl->fifo[pos] = value; - if (fdctrl->data_pos == fdctrl->data_len) { - /* We now have all parameters - * and will be able to treat the command - */ - fdctrl->phase = FD_PHASE_EXECUTION; - if (fdctrl->data_state & FD_STATE_FORMAT) { - fdctrl_format_sector(fdctrl); - return; + case FD_PHASE_COMMAND: + assert(!(fdctrl->msr & FD_MSR_NONDMA)); + + if (fdctrl->data_pos == 0) { + /* Command */ + pos = command_to_handler[value & 0xff]; + FLOPPY_DPRINTF("%s command\n", handlers[pos].name); + fdctrl->data_len = handlers[pos].parameters + 1; + fdctrl->msr |= FD_MSR_CMDBUSY; + } + + FLOPPY_DPRINTF("%s: %02x\n", __func__, value); + pos = fdctrl->data_pos++; + pos %= FD_SECTOR_LEN; + fdctrl->fifo[pos] = value; + if (fdctrl->data_pos == fdctrl->data_len) { + /* We now have all parameters + * and will be able to treat the command + */ + fdctrl->phase = FD_PHASE_EXECUTION; + if (fdctrl->data_state & FD_STATE_FORMAT) { + fdctrl_format_sector(fdctrl); + break; + } + + pos = command_to_handler[fdctrl->fifo[0] & 0xff]; + FLOPPY_DPRINTF("treat %s command\n", handlers[pos].name); + (*handlers[pos].handler)(fdctrl, handlers[pos].direction); } + break; - pos = command_to_handler[fdctrl->fifo[0] & 0xff]; - FLOPPY_DPRINTF("treat %s command\n", handlers[pos].name); - (*handlers[pos].handler)(fdctrl, handlers[pos].direction); + case FD_PHASE_RESULT: + default: + abort(); } } -- 2.11.4.GIT