diff options
| author | Owain Ainsworth <oga@cvs.openbsd.org> | 2009-04-20 00:42:07 +0000 |
|---|---|---|
| committer | Owain Ainsworth <oga@cvs.openbsd.org> | 2009-04-20 00:42:07 +0000 |
| commit | b5396dca6504168d952b238075ba34f507a94e0b (patch) | |
| tree | 39015d7d9f61a69ff36284c190932f40b1bc8834 /sys/arch/arm | |
| parent | 7720807a1d9f91f5c0f47d6b1be219d913aef6ac (diff) | |
Add a BUS_DMA_ZERO flag for bus_dmamem_alloc() to return zeroed memory.
Saves every damned driver calling bzero(), and continues the M_ZERO,
PR_ZERO symmetry.
Diffstat (limited to 'sys/arch/arm')
| -rw-r--r-- | sys/arch/arm/arm/bus_dma.c | 4 | ||||
| -rw-r--r-- | sys/arch/arm/include/bus.h | 3 |
2 files changed, 5 insertions, 2 deletions
diff --git a/sys/arch/arm/arm/bus_dma.c b/sys/arch/arm/arm/bus_dma.c index a6d20e3b353..5cde68127a3 100644 --- a/sys/arch/arm/arm/bus_dma.c +++ b/sys/arch/arm/arm/bus_dma.c @@ -1,4 +1,4 @@ -/* $OpenBSD: bus_dma.c,v 1.14 2009/04/14 16:01:04 oga Exp $ */ +/* $OpenBSD: bus_dma.c,v 1.15 2009/04/20 00:42:05 oga Exp $ */ /* $NetBSD: bus_dma.c,v 1.38 2003/10/30 08:44:13 scw Exp $ */ /*- @@ -975,6 +975,8 @@ _bus_dmamem_alloc_range(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, * Allocate pages from the VM system. */ plaflag = flags & BUS_DMA_NOWAIT ? UVM_PLA_NOWAIT : UVM_PLA_WAITOK; + if (flags & BUS_DMA_ZERO) + plaflag |= UVM_PLA_ZERO; TAILQ_INIT(&mlist); error = uvm_pglistalloc(size, low, high, alignment, boundary, diff --git a/sys/arch/arm/include/bus.h b/sys/arch/arm/include/bus.h index 8887be2605a..04408dbc798 100644 --- a/sys/arch/arm/include/bus.h +++ b/sys/arch/arm/include/bus.h @@ -1,4 +1,4 @@ -/* $OpenBSD: bus.h,v 1.10 2008/06/26 05:42:09 ray Exp $ */ +/* $OpenBSD: bus.h,v 1.11 2009/04/20 00:42:06 oga Exp $ */ /* $NetBSD: bus.h,v 1.12 2003/10/23 15:03:24 scw Exp $ */ /*- @@ -628,6 +628,7 @@ bs_c_8_proto(f); #define BUS_DMA_READ 0x100 /* mapping is device -> memory only */ #define BUS_DMA_WRITE 0x200 /* mapping is memory -> device only */ #define BUS_DMA_NOCACHE 0x400 /* hint: map non-cached memory */ +#define BUS_DMA_ZERO 0x800 /* dmamem_alloc returns zeroed mem */ /* * Private flags stored in the DMA map. |