/*
- * linux/arch/ppc64/kernel/vdso.c
- *
* Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/sections.h>
+#include <asm/firmware.h>
#include <asm/vdso.h>
#include <asm/vdso_datapage.h>
struct vm_area_struct *vma;
unsigned long vdso_pages;
unsigned long vdso_base;
+ int rc;
#ifdef CONFIG_PPC64
if (test_thread_flag(TIF_32BIT)) {
vdso_base = VDSO32_MBASE;
#endif
- current->thread.vdso_base = 0;
+ current->mm->context.vdso_base = 0;
/* vDSO has a problem and was disabled, just don't "enable" it for the
* process
*/
if (vdso_pages == 0)
return 0;
-
- vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
- if (vma == NULL)
- return -ENOMEM;
-
- memset(vma, 0, sizeof(*vma));
-
/* Add a page to the vdso size for the data page */
vdso_pages ++;
* at vdso_base which is the "natural" base for it, but we might fail
* and end up putting it elsewhere.
*/
+ down_write(&mm->mmap_sem);
vdso_base = get_unmapped_area(NULL, vdso_base,
vdso_pages << PAGE_SHIFT, 0, 0);
- if (vdso_base & ~PAGE_MASK) {
- kmem_cache_free(vm_area_cachep, vma);
- return (int)vdso_base;
+ if (IS_ERR_VALUE(vdso_base)) {
+ rc = vdso_base;
+ goto fail_mmapsem;
}
- current->thread.vdso_base = vdso_base;
+ /* Allocate a VMA structure and fill it up */
+ vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL);
+ if (vma == NULL) {
+ rc = -ENOMEM;
+ goto fail_mmapsem;
+ }
vma->vm_mm = mm;
- vma->vm_start = current->thread.vdso_base;
+ vma->vm_start = vdso_base;
vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT);
/*
* It's fine to use that for setting breakpoints in the vDSO code
* pages though
*/
- vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
+ vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
vma->vm_flags |= mm->def_flags;
vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
vma->vm_ops = &vdso_vmops;
- down_write(&mm->mmap_sem);
- if (insert_vm_struct(mm, vma)) {
- up_write(&mm->mmap_sem);
- kmem_cache_free(vm_area_cachep, vma);
- return -ENOMEM;
- }
+ /* Insert new VMA */
+ rc = insert_vm_struct(mm, vma);
+ if (rc)
+ goto fail_vma;
+
+ /* Put vDSO base into mm struct and account for memory usage */
+ current->mm->context.vdso_base = vdso_base;
mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
up_write(&mm->mmap_sem);
-
return 0;
+
+ fail_vma:
+ kmem_cache_free(vm_area_cachep, vma);
+ fail_mmapsem:
+ up_write(&mm->mmap_sem);
+ return rc;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
+ return "[vdso]";
+ return NULL;
}
+
+
static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
unsigned long *size)
{
vdso_data->version.major = SYSTEMCFG_MAJOR;
vdso_data->version.minor = SYSTEMCFG_MINOR;
vdso_data->processor = mfspr(SPRN_PVR);
- vdso_data->platform = _machine;
+ /*
+ * Fake the old platform number for pSeries and iSeries and add
+ * in LPAR bit if necessary
+ */
+ vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
+ if (firmware_has_feature(FW_FEATURE_LPAR))
+ vdso_data->platform |= 1;
vdso_data->physicalMemorySize = lmb_phys_mem_size();
vdso_data->dcache_size = ppc64_caches.dsize;
vdso_data->dcache_line_size = ppc64_caches.dline_size;