void __init vdso_init(void)
{
int i;
vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
DBG("vdso64_kbase: %p, 0x%x pages, vdso32_kbase: %p, 0x%x pages\n",
vdso64_kbase, vdso64_pages, vdso32_kbase, vdso32_pages);
/*
* Initialize the vDSO images in memory, that is do necessary
* fixups of vDSO symbols, locate trampolines, etc...
*/
if (vdso_setup()) {
printk(KERN_ERR "vDSO setup failure, not enabled !\n");
/* XXX should free pages here ? */
vdso64_pages = vdso32_pages = 0;
return;
}
/* Make sure pages are in the correct state */
for (i = 0; i < vdso64_pages; i++) {
struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
ClearPageReserved(pg);
get_page(pg);
}
for (i = 0; i < vdso32_pages; i++) {
struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
ClearPageReserved(pg);
get_page(pg);
}
}
static int __init vdso_init(void)
{
int data_pages = sizeof(vdso_data_store) >> PAGE_SHIFT;
/*
* We can disable vDSO support generally, but we need to retain
* one page to support the two-bundle (16-byte) rt_sigreturn path.
*/
if (!vdso_enabled) {
size_t offset = (unsigned long)&__vdso_rt_sigreturn;
static struct page *sigret_page;
sigret_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
BUG_ON(sigret_page == NULL);
vdso_pagelist = &sigret_page;
vdso_pages = 1;
BUG_ON(offset >= PAGE_SIZE);
memcpy(page_address(sigret_page) + offset,
vdso_start + offset, 16);
#ifdef CONFIG_COMPAT
vdso32_pages = vdso_pages;
vdso32_pagelist = vdso_pagelist;
#endif
vdso_ready = 1;
return 0;
}
vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
vdso_pages += data_pages;
vdso_pagelist = vdso_setup(vdso_start, vdso_pages);
#ifdef CONFIG_COMPAT
vdso32_pages = (vdso32_end - vdso32_start) >> PAGE_SHIFT;
vdso32_pages += data_pages;
vdso32_pagelist = vdso_setup(vdso32_start, vdso32_pages);
#endif
smp_wmb();
vdso_ready = 1;
return 0;
}
