Changeset fbcdeb8 in mainline for kernel/generic/include/ddi/ddi.h

Timestamp:

2011-12-19T17:30:39Z (13 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

58f6229

Parents:

24cf31f1

Message:

Remove the two-phase way of creating virtual memory areas (first asking for a mappable address and then mapping it) which was prone to race conditions when two or more calls to as_get_mappable_page() and as_area_create() were interleaved. This for example caused the e1k driver to randomly fail.

The memory area related syscalls and IPC calls have all been altered to accept a special value (void *) -1, representing a demand to atomically search for a mappable address space "hole" and map to it.

Individual changes:

• IPC_M_SHARE_OUT: the destination address space area is supplied by the kernel, the callee only specifies the lower bound

(the address is returned to the callee via a pointer in an IPC reply argument)

• IPC_M_SHARE_IN: the destination address space ares is supplied by the kernel, the callee only specifies the lower bound

(the address is returned to the caller as usual via an IPC argument)

• SYS_AS_GET_UNMAPPED_AREA was removed
• dummy implementations of SYS_PHYSMEM_UNMAP and SYS_IOSPACE_DISABLE were added for the sake of symmetry (they do nothing yet)
• SYS_PHYSMEM_MAP and SYS_DMAMEM_MAP were altered to accept (void *) -1 as address space area base and a lower bound
• kernel as_area_create() and as_area_share() were altered to accept (void *) -1 as address space area base and a lower bound
• uspace libraries and programs were altered to reflect the new API

File:

• kernel/generic/include/ddi/ddi.h (modified) (1 diff)

kernel/generic/include/ddi/ddi.h

@@ -55 +55 @@
 extern void ddi_parea_register(parea_t *);
 
-extern sysarg_t sys_physmem_map(uintptr_t, uintptr_t, size_t, unsigned int);
+extern sysarg_t sys_physmem_map(uintptr_t, size_t, unsigned int, void *,
+    uintptr_t);
+extern sysarg_t sys_physmem_unmap(uintptr_t);
 
-extern sysarg_t sys_dmamem_map(uintptr_t, size_t, unsigned int, unsigned int,
-    void *);
+extern sysarg_t sys_dmamem_map(size_t, unsigned int, unsigned int, void *,
+    void *, uintptr_t);
 extern sysarg_t sys_dmamem_unmap(uintptr_t, size_t, unsigned int);
 
 extern sysarg_t sys_iospace_enable(ddi_ioarg_t *);
+extern sysarg_t sys_iospace_disable(ddi_ioarg_t *);
 
 /*