Merge with rsync://fileserver/linux

[firefly-linux-kernel-4.4.55.git] / arch / i386 / kernel / setup.c

diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 30406fd0b64c56e1f3586f398e3f18183604c5bf..7306353c520ec6dc4c74a6cac328f8b5ba446d64 100644 (file)
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -43,7 +43,12 @@
 #include <linux/init.h>
 #include <linux/edd.h>
 #include <linux/nodemask.h>
+#include <linux/kexec.h>
+#include <linux/crash_dump.h>
+
 #include <video/edid.h>
+
+#include <asm/apic.h>
 #include <asm/e820.h>
 #include <asm/mpspec.h>
 #include <asm/setup.h>
@@ -55,12 +60,15 @@
 #include "setup_arch_pre.h"
 #include <bios_ebda.h>
 
+/* Forward Declaration. */
+void __init find_max_pfn(void);
+
 /* This value is set up by the early boot code to point to the value
    immediately after the boot time page tables.  It contains a *physical*
    address, and must not be in the .bss segment! */
 unsigned long init_pg_tables_end __initdata = ~0UL;
 
-int disable_pse __initdata = 0;
+int disable_pse __devinitdata = 0;
 
 /*
  * Machine setup..
@@ -732,6 +740,15 @@ static void __init parse_cmdline_early (char ** cmdline_p)
                        if (to != command_line)
                                to--;
                        if (!memcmp(from+7, "exactmap", 8)) {
+#ifdef CONFIG_CRASH_DUMP
+                               /* If we are doing a crash dump, we
+                                * still need to know the real mem
+                                * size before original memory map is
+                                * reset.
+                                */
+                               find_max_pfn();
+                               saved_max_pfn = max_pfn;
+#endif
                                from += 8+7;
                                e820.nr_map = 0;
                                userdef = 1;
@@ -835,6 +852,44 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 #endif /* CONFIG_X86_LOCAL_APIC */
 #endif /* CONFIG_ACPI_BOOT */
 
+#ifdef CONFIG_X86_LOCAL_APIC
+               /* enable local APIC */
+               else if (!memcmp(from, "lapic", 5))
+                       lapic_enable();
+
+               /* disable local APIC */
+               else if (!memcmp(from, "nolapic", 6))
+                       lapic_disable();
+#endif /* CONFIG_X86_LOCAL_APIC */
+
+#ifdef CONFIG_KEXEC
+               /* crashkernel=size@addr specifies the location to reserve for
+                * a crash kernel.  By reserving this memory we guarantee
+                * that linux never set's it up as a DMA target.
+                * Useful for holding code to do something appropriate
+                * after a kernel panic.
+                */
+               else if (!memcmp(from, "crashkernel=", 12)) {
+                       unsigned long size, base;
+                       size = memparse(from+12, &from);
+                       if (*from == '@') {
+                               base = memparse(from+1, &from);
+                               /* FIXME: Do I want a sanity check
+                                * to validate the memory range?
+                                */
+                               crashk_res.start = base;
+                               crashk_res.end   = base + size - 1;
+                       }
+               }
+#endif
+#ifdef CONFIG_CRASH_DUMP
+               /* elfcorehdr= specifies the location of elf core header
+                * stored by the crashed kernel.
+                */
+               else if (!memcmp(from, "elfcorehdr=", 11))
+                       elfcorehdr_addr = memparse(from+11, &from);
+#endif
+
                /*
                 * highmem=size forces highmem to be exactly 'size' bytes.
                 * This works even on boxes that have no highmem otherwise.
@@ -1113,8 +1168,8 @@ void __init setup_bootmem_allocator(void)
         * the (very unlikely) case of us accidentally initializing the
         * bootmem allocator with an invalid RAM area.
         */
-       reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(min_low_pfn) +
-                        bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY));
+       reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
+                        bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
 
        /*
         * reserve physical page 0 - it's a special BIOS page on many boxes,
@@ -1170,6 +1225,11 @@ void __init setup_bootmem_allocator(void)
                }
        }
 #endif
+#ifdef CONFIG_KEXEC
+       if (crashk_res.start != crashk_res.end)
+               reserve_bootmem(crashk_res.start,
+                       crashk_res.end - crashk_res.start + 1);
+#endif
 }
 
 /*
@@ -1223,6 +1283,9 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
                         */
                        request_resource(res, code_resource);
                        request_resource(res, data_resource);
+#ifdef CONFIG_KEXEC
+                       request_resource(res, &crashk_res);
+#endif
                }
        }
 }