Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / arch / x86 / kernel / setup.c
index 7791eef..d1c636b 100644 (file)
 #define ARCH_SETUP
 #endif
 
+/*
+ * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
+ * The direct mapping extends to max_pfn_mapped, so that we can directly access
+ * apertures, ACPI and other tables without having to play with fixmaps.
+ */
+unsigned long max_low_pfn_mapped;
+unsigned long max_pfn_mapped;
+
 RESERVE_BRK(dmi_alloc, 65536);
 
 unsigned int boot_cpu_id __read_mostly;
@@ -860,12 +868,16 @@ void __init setup_arch(char **cmdline_p)
                max_low_pfn = max_pfn;
 
        high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+       max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 #endif
 
 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
        setup_bios_corruption_check();
 #endif
 
+       printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
+                       max_pfn_mapped<<PAGE_SHIFT);
+
        reserve_brk();
 
        /* max_pfn_mapped is updated here */