diff options
| -rw-r--r-- | sys/dev/sound/pcm/dsp.c | 56 |
1 files changed, 35 insertions, 21 deletions
diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c index 66d0c8c..8e93931 100644 --- a/sys/dev/sound/pcm/dsp.c +++ b/sys/dev/sound/pcm/dsp.c @@ -34,6 +34,11 @@ #include <sys/ctype.h> #include <sys/sysent.h> +#include <vm/vm.h> +#include <vm/vm_object.h> +#include <vm/vm_page.h> +#include <vm/vm_pager.h> + SND_DECLARE_FILE("$FreeBSD$"); static int dsp_mmap_allow_prot_exec = 0; @@ -67,6 +72,7 @@ static d_write_t dsp_write; static d_ioctl_t dsp_ioctl; static d_poll_t dsp_poll; static d_mmap_t dsp_mmap; +static d_mmap_single_t dsp_mmap_single; struct cdevsw dsp_cdevsw = { .d_version = D_VERSION, @@ -77,6 +83,7 @@ struct cdevsw dsp_cdevsw = { .d_ioctl = dsp_ioctl, .d_poll = dsp_poll, .d_mmap = dsp_mmap, + .d_mmap_single = dsp_mmap_single, .d_name = "dsp", }; @@ -2187,6 +2194,16 @@ static int dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr) { + + /* XXX memattr is not honored */ + *paddr = vtophys(offset); + return (0); +} + +static int +dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset, + vm_size_t size, struct vm_object **object, int nprot) +{ struct snddev_info *d; struct pcm_channel *wrch, *rdch, *c; @@ -2205,51 +2222,48 @@ dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr, #else if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1) #endif - return (-1); + return (EINVAL); + + /* + * PROT_READ (alone) selects the input buffer. + * PROT_WRITE (alone) selects the output buffer. + * PROT_WRITE|PROT_READ together select the output buffer. + */ + if ((nprot & (PROT_READ | PROT_WRITE)) == 0) + return (EINVAL); d = dsp_get_info(i_dev); if (!DSP_REGISTERED(d, i_dev)) - return (-1); + return (EINVAL); PCM_GIANT_ENTER(d); getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR); - /* - * XXX The linux api uses the nprot to select read/write buffer - * our vm system doesn't allow this, so force write buffer. - * - * This is just a quack to fool full-duplex mmap, so that at - * least playback _or_ recording works. If you really got the - * urge to make _both_ work at the same time, avoid O_RDWR. - * Just open each direction separately and mmap() it. - * - * Failure is not an option due to INVARIANTS check within - * device_pager.c, which means, we have to give up one over - * another. - */ - c = (wrch != NULL) ? wrch : rdch; - + c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch; if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) || - offset >= sndbuf_getsize(c->bufsoft) || + (*offset + size) > sndbuf_getsize(c->bufsoft) || (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) || (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) { relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR); PCM_GIANT_EXIT(d); - return (-1); + return (EINVAL); } - /* XXX full-duplex quack. */ if (wrch != NULL) wrch->flags |= CHN_F_MMAP; if (rdch != NULL) rdch->flags |= CHN_F_MMAP; - *paddr = vtophys(sndbuf_getbufofs(c->bufsoft, offset)); + *offset = (vm_ooffset_t)sndbuf_getbufofs(c->bufsoft, *offset); relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR); + *object = vm_pager_allocate(OBJT_DEVICE, i_dev, + size, nprot, *offset, curthread->td_ucred); PCM_GIANT_LEAVE(d); + if (*object == NULL) + return (EINVAL); return (0); } |
