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* Introduced CREATE_AREA_DONT_CLEAR create_area_etc() flag, which allows the

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call to fetch non-clear pages.
* B_PHYSICAL_BASE_ADDRESS does now imply B_CONTIGUOUS.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31932 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2009-07-29 18:57:21 +00:00
parent 00e22bae44
commit 069b477dd7
2 changed files with 6 additions and 2 deletions
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1
headers/private/kernel/vm.h
View File

@ -27,6 +27,7 @@ struct vnode;
// area creation flags
#define CREATE_AREA_DONT_WAIT 0x01
#define CREATE_AREA_UNMAP_ADDRESS_RANGE 0x02
#define CREATE_AREA_DONT_CLEAR 0x04
#ifdef __cplusplus

7
src/system/kernel/vm/vm.cpp
View File

@ -1768,6 +1768,8 @@ vm_create_anonymous_area(team_id team, const char* name, void** address,
page_num_t guardPages;
bool canOvercommit = false;
addr_t physicalBase = 0;
uint32 newPageState = (flags & CREATE_AREA_DONT_CLEAR) != 0
? PAGE_STATE_FREE : PAGE_STATE_CLEAR;
TRACE(("create_anonymous_area [%d] %s: size 0x%lx\n", team, name, size));
@ -1797,6 +1799,7 @@ vm_create_anonymous_area(team_id team, const char* name, void** address,
case B_PHYSICAL_BASE_ADDRESS:
physicalBase = (addr_t)*address;
addressSpec = B_ANY_KERNEL_ADDRESS;
wiring = B_CONTIGUOUS;
break;
default:
@ -1884,7 +1887,7 @@ vm_create_anonymous_area(team_id team, const char* name, void** address,
if (wiring == B_CONTIGUOUS) {
// we try to allocate the page run here upfront as this may easily
// fail for obvious reasons
page = vm_page_allocate_page_run(PAGE_STATE_CLEAR, physicalBase,
page = vm_page_allocate_page_run(newPageState, physicalBase,
size / B_PAGE_SIZE);
if (page == NULL) {
status = B_NO_MEMORY;
@ -1957,7 +1960,7 @@ vm_create_anonymous_area(team_id team, const char* name, void** address,
# endif
continue;
#endif
vm_page* page = vm_page_allocate_page(PAGE_STATE_CLEAR, true);
vm_page* page = vm_page_allocate_page(newPageState, true);
cache->InsertPage(page, offset);
vm_map_page(area, page, address, protection);