#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/efi.h>
+#include <linux/memory_hotplug.h>
+#include <linux/initrd.h>
#include <asm/processor.h>
#include <asm/system.h>
extern int is_available_memory(efi_memory_desc_t *);
-static inline int page_is_ram(unsigned long pagenr)
+int page_is_ram(unsigned long pagenr)
{
int i;
unsigned long addr, end;
if (efi_enabled) {
efi_memory_desc_t *md;
+ void *p;
- for (i = 0; i < memmap.nr_map; i++) {
- md = &memmap.map[i];
+ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
+ md = p;
if (!is_available_memory(md))
continue;
addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT;
return 0;
}
+/*
+ * devmem_is_allowed() checks to see if /dev/mem access to a certain address is
+ * valid. The argument is a physical page number.
+ *
+ *
+ * On x86, access has to be given to the first megabyte of ram because that area
+ * contains bios code and data regions used by X and dosemu and similar apps.
+ * Access has to be given to non-kernel-ram areas as well, these contain the PCI
+ * mmio resources as well as potential bios/acpi data regions.
+ */
+int devmem_is_allowed(unsigned long pagenr)
+{
+ if (pagenr <= 256)
+ return 1;
+ if (!page_is_ram(pagenr))
+ return 1;
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(page_is_ram);
+
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
-EXPORT_SYMBOL(kmap_prot);
-EXPORT_SYMBOL(kmap_pte);
-
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr))
-void __init kmap_init(void)
+static void __init kmap_init(void)
{
unsigned long kmap_vstart;
kmap_prot = PAGE_KERNEL;
}
-void __init permanent_kmaps_init(pgd_t *pgd_base)
+static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pkmap_page_table = pte;
}
-void __init one_highpage_init(struct page *page, int pfn, int bad_ppro)
+static void __meminit free_new_highpage(struct page *page)
+{
+ init_page_count(page);
+ __free_page(page);
+ totalhigh_pages++;
+}
+
+void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
{
if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
ClearPageReserved(page);
- set_bit(PG_highmem, &page->flags);
- set_page_count(page, 1);
- __free_page(page);
- totalhigh_pages++;
+ free_new_highpage(page);
} else
SetPageReserved(page);
}
-#ifndef CONFIG_DISCONTIGMEM
-void __init set_highmem_pages_init(int bad_ppro)
+static int add_one_highpage_hotplug(struct page *page, unsigned long pfn)
+{
+ free_new_highpage(page);
+ totalram_pages++;
+#ifdef CONFIG_FLATMEM
+ max_mapnr = max(pfn, max_mapnr);
+#endif
+ num_physpages++;
+ return 0;
+}
+
+/*
+ * Not currently handling the NUMA case.
+ * Assuming single node and all memory that
+ * has been added dynamically that would be
+ * onlined here is in HIGHMEM
+ */
+void online_page(struct page *page)
+{
+ ClearPageReserved(page);
+ add_one_highpage_hotplug(page, page_to_pfn(page));
+}
+
+
+#ifdef CONFIG_NUMA
+extern void set_highmem_pages_init(int);
+#else
+static void __init set_highmem_pages_init(int bad_ppro)
{
int pfn;
for (pfn = highstart_pfn; pfn < highend_pfn; pfn++)
- one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
+ add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
totalram_pages += totalhigh_pages;
}
-#else
-extern void set_highmem_pages_init(int);
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_FLATMEM */
#else
#define kmap_init() do { } while (0)
#endif /* CONFIG_HIGHMEM */
unsigned long long __PAGE_KERNEL = _PAGE_KERNEL;
+EXPORT_SYMBOL(__PAGE_KERNEL);
unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
-#ifndef CONFIG_DISCONTIGMEM
-#define remap_numa_kva() do {} while (0)
-#else
+#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
+#else
+#define remap_numa_kva() do {} while (0)
#endif
static void __init pagetable_init (void)
* All user-space mappings are explicitly cleared after
* SMP startup.
*/
- pgd_base[0] = pgd_base[USER_PTRS_PER_PGD];
+ set_pgd(&pgd_base[0], pgd_base[USER_PTRS_PER_PGD]);
#endif
}
-#if defined(CONFIG_PM_DISK) || defined(CONFIG_SOFTWARE_SUSPEND)
+#ifdef CONFIG_SOFTWARE_SUSPEND
/*
* Swap suspend & friends need this for resume because things like the intel-agp
* driver might have split up a kernel 4MB mapping.
flush_tlb_all();
}
-#ifndef CONFIG_DISCONTIGMEM
-void __init zone_sizes_init(void)
-{
- unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
- unsigned int max_dma, high, low;
-
- max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
- low = max_low_pfn;
- high = highend_pfn;
-
- if (low < max_dma)
- zones_size[ZONE_DMA] = low;
- else {
- zones_size[ZONE_DMA] = max_dma;
- zones_size[ZONE_NORMAL] = low - max_dma;
-#ifdef CONFIG_HIGHMEM
- zones_size[ZONE_HIGHMEM] = high - low;
-#endif
- }
- free_area_init(zones_size);
-}
-#else
-extern void zone_sizes_init(void);
-#endif /* !CONFIG_DISCONTIGMEM */
-
static int disable_nx __initdata = 0;
-u64 __supported_pte_mask = ~_PAGE_NX;
+u64 __supported_pte_mask __read_mostly = ~_PAGE_NX;
/*
* noexec = on|off
* Control non executable mappings.
*
* on Enable
- * off Disable
+ * off Disable (disables exec-shield too)
*/
void __init noexec_setup(const char *str)
{
} else if (!strncmp(str,"off",3)) {
disable_nx = 1;
__supported_pte_mask &= ~_PAGE_NX;
+ exec_shield = 0;
}
}
set_nx();
if (nx_enabled)
printk("NX (Execute Disable) protection: active\n");
+ else
#endif
+ if (exec_shield)
+ printk("Using x86 segment limits to approximate NX protection\n");
pagetable_init();
__flush_tlb_all();
kmap_init();
- zone_sizes_init();
}
/*
* but fortunately the switch to using exceptions got rid of all that.
*/
-void __init test_wp_bit(void)
+static void __init test_wp_bit(void)
{
printk("Checking if this processor honours the WP bit even in supervisor mode... ");
}
}
-#ifndef CONFIG_DISCONTIGMEM
static void __init set_max_mapnr_init(void)
{
#ifdef CONFIG_HIGHMEM
- max_mapnr = num_physpages = highend_pfn;
+ num_physpages = highend_pfn;
#else
- max_mapnr = num_physpages = max_low_pfn;
+ num_physpages = max_low_pfn;
+#endif
+#ifdef CONFIG_FLATMEM
+ max_mapnr = num_physpages;
#endif
}
-#define __free_all_bootmem() free_all_bootmem()
-#else
-#define __free_all_bootmem() free_all_bootmem_node(NODE_DATA(0))
-extern void set_max_mapnr_init(void);
-#endif /* !CONFIG_DISCONTIGMEM */
static struct kcore_list kcore_mem, kcore_vmalloc;
int tmp;
int bad_ppro;
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
if (!mem_map)
BUG();
#endif
set_max_mapnr_init();
#ifdef CONFIG_HIGHMEM
- high_memory = (void *) __va(highstart_pfn * PAGE_SIZE);
+ high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
- high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+ high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
/* this will put all low memory onto the freelists */
- totalram_pages += __free_all_bootmem();
+ totalram_pages += free_all_bootmem();
reservedpages = 0;
for (tmp = 0; tmp < max_low_pfn; tmp++)
#endif
}
+/*
+ * this is for the non-NUMA, single node SMP system case.
+ * Specifically, in the case of x86, we will always add
+ * memory to the highmem for now.
+ */
+#ifdef CONFIG_MEMORY_HOTPLUG
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+int add_memory(u64 start, u64 size)
+{
+ struct pglist_data *pgdata = &contig_page_data;
+ struct zone *zone = pgdata->node_zones + MAX_NR_ZONES-1;
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ return __add_pages(zone, start_pfn, nr_pages);
+}
+
+int remove_memory(u64 start, u64 size)
+{
+ return -EINVAL;
+}
+#endif
+#endif
+
kmem_cache_t *pgd_cache;
kmem_cache_t *pmd_cache;
return flag;
}
-void free_initmem(void)
+#ifdef CONFIG_DEBUG_RODATA
+
+extern char __start_rodata, __end_rodata;
+void mark_rodata_ro(void)
+{
+ unsigned long addr = (unsigned long)&__start_rodata;
+
+ for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+ change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
+
+ printk ("Write protecting the kernel read-only data: %luk\n",
+ (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+
+ /*
+ * change_page_attr() requires a global_flush_tlb() call after it.
+ * We do this after the printk so that if something went wrong in the
+ * change, the printk gets out at least to give a better debug hint
+ * of who is the culprit.
+ */
+ global_flush_tlb();
+}
+#endif
+
+void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
unsigned long addr;
- addr = (unsigned long)(&__init_begin);
- for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
+ for (addr = begin; addr < end; addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
- set_page_count(virt_to_page(addr), 1);
+ init_page_count(virt_to_page(addr));
memset((void *)addr, 0xcc, PAGE_SIZE);
free_page(addr);
totalram_pages++;
}
- printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10);
+ printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+void free_initmem(void)
+{
+ free_init_pages("unused kernel memory",
+ (unsigned long)(&__init_begin),
+ (unsigned long)(&__init_end));
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
- if (start < end)
- printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
- for (; start < end; start += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(start));
- set_page_count(virt_to_page(start), 1);
- free_page(start);
- totalram_pages++;
- }
+ free_init_pages("initrd memory", start, end);
}
#endif
+
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