/**
* Frees memory allocated using RTMemContAlloc().
*
* @param pv Pointer to return from RTMemContAlloc().
* @param cb The cb parameter passed to RTMemContAlloc().
*/
RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
{
if (pv)
{
int cOrder;
unsigned cPages;
unsigned iPage;
struct page *paPages;
IPRT_LINUX_SAVE_EFL_AC();
/* validate */
AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
Assert(cb > 0);
/* calc order and get pages */
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
cPages = cb >> PAGE_SHIFT;
cOrder = CalcPowerOf2Order(cPages);
paPages = virt_to_page(pv);
/*
* Restore page attributes freeing the pages.
*/
for (iPage = 0; iPage < cPages; iPage++)
{
ClearPageReserved(&paPages[iPage]);
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 20) /** @todo find the exact kernel where change_page_attr was introduced. */
MY_SET_PAGES_NOEXEC(&paPages[iPage], 1);
#endif
}
__free_pages(paPages, cOrder);
IPRT_LINUX_RESTORE_EFL_AC();
}
}
/**
* Frees the physical pages allocated by the rtR0MemObjLinuxAllocPages() call.
*
* This method does NOT free the object.
*
* @param pMemLnx The object which physical pages should be freed.
*/
static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx)
{
size_t iPage = pMemLnx->cPages;
if (iPage > 0)
{
/*
* Restore the page flags.
*/
while (iPage-- > 0)
{
ClearPageReserved(pMemLnx->apPages[iPage]);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
#else
MY_SET_PAGES_NOEXEC(pMemLnx->apPages[iPage], 1);
#endif
}
/*
* Free the pages.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 22)
if (!pMemLnx->fContiguous)
{
iPage = pMemLnx->cPages;
while (iPage-- > 0)
__free_page(pMemLnx->apPages[iPage]);
}
else
#endif
__free_pages(pMemLnx->apPages[0], rtR0MemObjLinuxOrder(pMemLnx->cPages));
pMemLnx->cPages = 0;
}
}
