#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/smp.h>
+#include <asm/sections.h>
+#include <asm/dma-mapping.h>
+#include <asm/swiotlb.h>
#ifndef Dprintk
#define Dprintk(x...)
#endif
-#ifdef CONFIG_GART_IOMMU
-extern int swiotlb;
-#endif
+struct dma_mapping_ops* dma_ops;
+EXPORT_SYMBOL(dma_ops);
-extern char _stext[];
+static unsigned long dma_reserve __initdata;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
void show_mem(void)
{
- int i, total = 0, reserved = 0;
- int shared = 0, cached = 0;
+ long i, total = 0, reserved = 0;
+ long shared = 0, cached = 0;
pg_data_t *pgdat;
struct page *page;
- printk("Mem-info:\n");
+ printk(KERN_INFO "Mem-info:\n");
show_free_areas();
- printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
for_each_pgdat(pgdat) {
for (i = 0; i < pgdat->node_spanned_pages; ++i) {
page = pfn_to_page(pgdat->node_start_pfn + i);
total++;
- if (PageReserved(page))
- reserved++;
- else if (PageSwapCache(page))
- cached++;
- else if (page_count(page))
- shared += page_count(page) - 1;
+ if (PageReserved(page))
+ reserved++;
+ else if (PageSwapCache(page))
+ cached++;
+ else if (page_count(page))
+ shared += page_count(page) - 1;
}
}
- printk("%d pages of RAM\n", total);
- printk("%d reserved pages\n",reserved);
- printk("%d pages shared\n",shared);
- printk("%d pages swap cached\n",cached);
+ printk(KERN_INFO "%lu pages of RAM\n", total);
+ printk(KERN_INFO "%lu reserved pages\n",reserved);
+ printk(KERN_INFO "%lu pages shared\n",shared);
+ printk(KERN_INFO "%lu pages swap cached\n",cached);
}
/* References to section boundaries */
-extern char _text, _etext, _edata, __bss_start, _end[];
-extern char __init_begin, __init_end;
-
int after_bootmem;
static void *spp_getpage(void)
static void __init find_early_table_space(unsigned long end)
{
- unsigned long puds, pmds, tables;
+ unsigned long puds, pmds, tables, start;
puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
- table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables);
+ /* RED-PEN putting page tables only on node 0 could
+ cause a hotspot and fill up ZONE_DMA. The page tables
+ need roughly 0.5KB per GB. */
+ start = 0x8000;
+ table_start = find_e820_area(start, end, tables);
if (table_start == -1UL)
panic("Cannot find space for the kernel page tables");
table_end<<PAGE_SHIFT);
}
-extern struct x8664_pda cpu_pda[NR_CPUS];
+void __cpuinit zap_low_mappings(int cpu)
+{
+ if (cpu == 0) {
+ pgd_t *pgd = pgd_offset_k(0UL);
+ pgd_clear(pgd);
+ } else {
+ /*
+ * For AP's, zap the low identity mappings by changing the cr3
+ * to init_level4_pgt and doing local flush tlb all
+ */
+ asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
+ }
+ __flush_tlb_all();
+}
-/* Assumes all CPUs still execute in init_mm */
-void zap_low_mappings(void)
+/* Compute zone sizes for the DMA and DMA32 zones in a node. */
+__init void
+size_zones(unsigned long *z, unsigned long *h,
+ unsigned long start_pfn, unsigned long end_pfn)
{
- pgd_t *pgd = pgd_offset_k(0UL);
- pgd_clear(pgd);
- flush_tlb_all();
+ int i;
+ unsigned long w;
+
+ for (i = 0; i < MAX_NR_ZONES; i++)
+ z[i] = 0;
+
+ if (start_pfn < MAX_DMA_PFN)
+ z[ZONE_DMA] = MAX_DMA_PFN - start_pfn;
+ if (start_pfn < MAX_DMA32_PFN) {
+ unsigned long dma32_pfn = MAX_DMA32_PFN;
+ if (dma32_pfn > end_pfn)
+ dma32_pfn = end_pfn;
+ z[ZONE_DMA32] = dma32_pfn - start_pfn;
+ }
+ z[ZONE_NORMAL] = end_pfn - start_pfn;
+
+ /* Remove lower zones from higher ones. */
+ w = 0;
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ if (z[i])
+ z[i] -= w;
+ w += z[i];
+ }
+
+ /* Compute holes */
+ w = start_pfn;
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ unsigned long s = w;
+ w += z[i];
+ h[i] = e820_hole_size(s, w);
+ }
+
+ /* Add the space pace needed for mem_map to the holes too. */
+ for (i = 0; i < MAX_NR_ZONES; i++)
+ h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE;
+
+ /* The 16MB DMA zone has the kernel and other misc mappings.
+ Account them too */
+ if (h[ZONE_DMA]) {
+ h[ZONE_DMA] += dma_reserve;
+ if (h[ZONE_DMA] >= z[ZONE_DMA]) {
+ printk(KERN_WARNING
+ "Kernel too large and filling up ZONE_DMA?\n");
+ h[ZONE_DMA] = z[ZONE_DMA];
+ }
+ }
}
#ifndef CONFIG_NUMA
void __init paging_init(void)
{
- {
- unsigned long zones_size[MAX_NR_ZONES];
- unsigned long holes[MAX_NR_ZONES];
- unsigned int max_dma;
-
- memset(zones_size, 0, sizeof(zones_size));
- memset(holes, 0, sizeof(holes));
-
- max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
-
- if (end_pfn < max_dma) {
- zones_size[ZONE_DMA] = end_pfn;
- holes[ZONE_DMA] = e820_hole_size(0, end_pfn);
- } else {
- zones_size[ZONE_DMA] = max_dma;
- holes[ZONE_DMA] = e820_hole_size(0, max_dma);
- zones_size[ZONE_NORMAL] = end_pfn - max_dma;
- holes[ZONE_NORMAL] = e820_hole_size(max_dma, end_pfn);
- }
- free_area_init_node(0, NODE_DATA(0), zones_size,
- __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes);
- }
- return;
+ unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES];
+ size_zones(zones, holes, 0, end_pfn);
+ free_area_init_node(0, NODE_DATA(0), zones,
+ __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes);
}
#endif
__flush_tlb_all();
}
-static inline int page_is_ram (unsigned long pagenr)
-{
- int i;
-
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long addr, end;
-
- if (e820.map[i].type != E820_RAM) /* not usable memory */
- continue;
- /*
- * !!!FIXME!!! Some BIOSen report areas as RAM that
- * are not. Notably the 640->1Mb area. We need a sanity
- * check here.
- */
- addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
- end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
- if ((pagenr >= addr) && (pagenr < end))
- return 1;
- }
- return 0;
-}
-
-extern int swiotlb_force;
-
static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
kcore_vsyscall;
void __init mem_init(void)
{
- int codesize, reservedpages, datasize, initsize;
- int tmp;
+ long codesize, reservedpages, datasize, initsize;
#ifdef CONFIG_SWIOTLB
- if (swiotlb_force)
- swiotlb = 1;
- if (!iommu_aperture &&
- (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu))
- swiotlb = 1;
- if (swiotlb)
- swiotlb_init();
+ pci_swiotlb_init();
#endif
+ no_iommu_init();
/* How many end-of-memory variables you have, grandma! */
max_low_pfn = end_pfn;
/* this will put all low memory onto the freelists */
#ifdef CONFIG_NUMA
- totalram_pages += numa_free_all_bootmem();
- tmp = 0;
- /* should count reserved pages here for all nodes */
+ totalram_pages = numa_free_all_bootmem();
#else
-
-#ifdef CONFIG_FLATMEM
- max_mapnr = end_pfn;
- if (!mem_map) BUG();
-#endif
-
- totalram_pages += free_all_bootmem();
-
- for (tmp = 0; tmp < end_pfn; tmp++)
- /*
- * Only count reserved RAM pages
- */
- if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
- reservedpages++;
+ totalram_pages = free_all_bootmem();
#endif
+ reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn);
after_bootmem = 1;
kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
VSYSCALL_END - VSYSCALL_START);
- printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
+ printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
end_pfn << (PAGE_SHIFT-10),
codesize >> 10,
datasize >> 10,
initsize >> 10);
+#ifdef CONFIG_SMP
/*
- * Subtle. SMP is doing its boot stuff late (because it has to
- * fork idle threads) - but it also needs low mappings for the
- * protected-mode entry to work. We zap these entries only after
- * the WP-bit has been tested.
+ * Sync boot_level4_pgt mappings with the init_level4_pgt
+ * except for the low identity mappings which are already zapped
+ * in init_level4_pgt. This sync-up is essential for AP's bringup
*/
-#ifndef CONFIG_SMP
- zap_low_mappings();
+ memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t));
#endif
}
-extern char __initdata_begin[], __initdata_end[];
-
void free_initmem(void)
{
unsigned long addr;
totalram_pages++;
}
memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin);
- printk ("Freeing unused kernel memory: %luk freed\n", (&__init_end - &__init_begin) >> 10);
+ printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10);
}
+#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_addr(addr, 1, PAGE_KERNEL_RO);
+
+ printk ("Write protecting the kernel read-only data: %luk\n",
+ (&__end_rodata - &__start_rodata) >> 10);
+
+ /*
+ * change_page_attr_addr() 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
+
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
#else
reserve_bootmem(phys, len);
#endif
+ if (phys+len <= MAX_DMA_PFN*PAGE_SIZE)
+ dma_reserve += len / PAGE_SIZE;
}
int kern_addr_valid(unsigned long addr)
static ctl_table debug_table2[] = {
{ 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL,
proc_dointvec },
-#ifdef CONFIG_CHECKING
- { 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL,
- proc_dointvec },
-#endif
{ 0, }
};
projects / karo-tx-linux.git / blobdiff