/*
* set up paging
*/
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = {0,};
pte_t *ppte;
int loop;
/* main kernel space -> RAM mapping is handled as 1:1 transparent by
* the MMU */
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
/* load the VMALLOC area PTE table addresses into the kernel PGD */
ppte = kernel_vmalloc_ptes;
for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
loop++
) {
set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
ppte += PAGE_SIZE / sizeof(pte_t);
}
/* declare the sizes of the RAM zones (only use the normal zone) */
zones_size[ZONE_NORMAL] =
contig_page_data.bdata->node_low_pfn -
contig_page_data.bdata->node_min_pfn;
/* pass the memory from the bootmem allocator to the main allocator */
free_area_init(zones_size);
#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
/* The Atomic Operation Unit registers need to be mapped to userspace
* for all processes. The following uses vm_area_register_early() to
* reserve the first page of the vmalloc area and sets the pte for that
* page.
*
* glibc hardcodes this virtual mapping, so we're pretty much stuck with
* it from now on.
*/
user_iomap_vm.flags = VM_USERMAP;
user_iomap_vm.size = 1 << PAGE_SHIFT;
vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
ppte = kernel_vmalloc_ptes;
set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
PAGE_USERIO));
#endif
local_flush_tlb_all();
}
void __init xen_vmalloc_p2m_tree(void)
{
static struct vm_struct vm;
vm.flags = VM_ALLOC;
vm.size = ALIGN(sizeof(unsigned long) * xen_max_p2m_pfn,
PMD_SIZE * PMDS_PER_MID_PAGE);
vm_area_register_early(&vm, PMD_SIZE * PMDS_PER_MID_PAGE);
pr_notice("p2m virtual area at %p, size is %lx\n", vm.addr, vm.size);
xen_max_p2m_pfn = vm.size / sizeof(unsigned long);
xen_rebuild_p2m_list(vm.addr);
xen_p2m_addr = vm.addr;
xen_p2m_size = xen_max_p2m_pfn;
xen_inv_extra_mem();
m2p_override_init();
}
void __init xen_vmalloc_p2m_tree(void)
{
static struct vm_struct vm;
unsigned long p2m_limit;
p2m_limit = (phys_addr_t)P2M_LIMIT * 1024 * 1024 * 1024 / PAGE_SIZE;
vm.flags = VM_ALLOC;
vm.size = ALIGN(sizeof(unsigned long) * max(xen_max_p2m_pfn, p2m_limit),
PMD_SIZE * PMDS_PER_MID_PAGE);
vm_area_register_early(&vm, PMD_SIZE * PMDS_PER_MID_PAGE);
pr_notice("p2m virtual area at %p, size is %lx\n", vm.addr, vm.size);
xen_max_p2m_pfn = vm.size / sizeof(unsigned long);
xen_rebuild_p2m_list(vm.addr);
xen_p2m_addr = vm.addr;
xen_p2m_size = xen_max_p2m_pfn;
xen_inv_extra_mem();
}
static ssize_t __init setup_pcpu_remap(size_t static_size)
{
static struct vm_struct vm;
size_t ptrs_size, dyn_size;
unsigned int cpu;
ssize_t ret;
/*
* If large page isn't supported, there's no benefit in doing
* this. Also, on non-NUMA, embedding is better.
*/
if (!cpu_has_pse || !pcpu_need_numa())
return -EINVAL;
/*
* Currently supports only single page. Supporting multiple
* pages won't be too difficult if it ever becomes necessary.
*/
pcpur_size = PFN_ALIGN(static_size + PERCPU_MODULE_RESERVE +
PERCPU_DYNAMIC_RESERVE);
if (pcpur_size > PMD_SIZE) {
pr_warning("PERCPU: static data is larger than large page, "
"can't use large page\n");
return -EINVAL;
}
dyn_size = pcpur_size - static_size - PERCPU_FIRST_CHUNK_RESERVE;
/* allocate pointer array and alloc large pages */
ptrs_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpur_ptrs[0]));
pcpur_ptrs = alloc_bootmem(ptrs_size);
for_each_possible_cpu(cpu) {
pcpur_ptrs[cpu] = pcpu_alloc_bootmem(cpu, PMD_SIZE, PMD_SIZE);
if (!pcpur_ptrs[cpu])
goto enomem;
/*
* Only use pcpur_size bytes and give back the rest.
*
* Ingo: The 2MB up-rounding bootmem is needed to make
* sure the partial 2MB page is still fully RAM - it's
* not well-specified to have a PAT-incompatible area
* (unmapped RAM, device memory, etc.) in that hole.
*/
free_bootmem(__pa(pcpur_ptrs[cpu] + pcpur_size),
PMD_SIZE - pcpur_size);
memcpy(pcpur_ptrs[cpu], __per_cpu_load, static_size);
}
/* allocate address and map */
vm.flags = VM_ALLOC;
vm.size = num_possible_cpus() * PMD_SIZE;
vm_area_register_early(&vm, PMD_SIZE);
for_each_possible_cpu(cpu) {
pmd_t *pmd;
pmd = populate_extra_pmd((unsigned long)vm.addr
+ cpu * PMD_SIZE);
set_pmd(pmd, pfn_pmd(page_to_pfn(virt_to_page(pcpur_ptrs[cpu])),
PAGE_KERNEL_LARGE));
}
/* we're ready, commit */
pr_info("PERCPU: Remapped at %p with large pages, static data "
"%zu bytes\n", vm.addr, static_size);
ret = pcpu_setup_first_chunk(pcpur_get_page, static_size,
PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
PMD_SIZE, vm.addr, NULL);
goto out_free_ar;
enomem:
for_each_possible_cpu(cpu)
if (pcpur_ptrs[cpu])
free_bootmem(__pa(pcpur_ptrs[cpu]), PMD_SIZE);
ret = -ENOMEM;
out_free_ar:
free_bootmem(__pa(pcpur_ptrs), ptrs_size);
return ret;
}