x86_64: move kernel

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 259 insertions, 0 deletions

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
new file mode 100644
index 000000000000..c3a554703672
--- /dev/null
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -0,0 +1,259 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ * Copyright (C) 2002-2005 Eric Biederman  <ebiederm@xmission.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/string.h>
+#include <linux/reboot.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+
+#define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE)))
+static u64 kexec_pgd[512] PAGE_ALIGNED;
+static u64 kexec_pud0[512] PAGE_ALIGNED;
+static u64 kexec_pmd0[512] PAGE_ALIGNED;
+static u64 kexec_pte0[512] PAGE_ALIGNED;
+static u64 kexec_pud1[512] PAGE_ALIGNED;
+static u64 kexec_pmd1[512] PAGE_ALIGNED;
+static u64 kexec_pte1[512] PAGE_ALIGNED;
+
+static void init_level2_page(pmd_t *level2p, unsigned long addr)
+{
+        unsigned long end_addr;
+
+        addr &= PAGE_MASK;
+        end_addr = addr + PUD_SIZE;
+        while (addr < end_addr) {
+                set_pmd(level2p++, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
+                addr += PMD_SIZE;
+        }
+}
+
+static int init_level3_page(struct kimage *image, pud_t *level3p,
+                                unsigned long addr, unsigned long last_addr)
+{
+        unsigned long end_addr;
+        int result;
+
+        result = 0;
+        addr &= PAGE_MASK;
+        end_addr = addr + PGDIR_SIZE;
+        while ((addr < last_addr) && (addr < end_addr)) {
+                struct page *page;
+                pmd_t *level2p;
+
+                page = kimage_alloc_control_pages(image, 0);
+                if (!page) {
+                        result = -ENOMEM;
+                        goto out;
+                }
+                level2p = (pmd_t *)page_address(page);
+                init_level2_page(level2p, addr);
+                set_pud(level3p++, __pud(__pa(level2p) | _KERNPG_TABLE));
+                addr += PUD_SIZE;
+        }
+        /* clear the unused entries */
+        while (addr < end_addr) {
+                pud_clear(level3p++);
+                addr += PUD_SIZE;
+        }
+out:
+        return result;
+}
+
+
+static int init_level4_page(struct kimage *image, pgd_t *level4p,
+                                unsigned long addr, unsigned long last_addr)
+{
+        unsigned long end_addr;
+        int result;
+
+        result = 0;
+        addr &= PAGE_MASK;
+        end_addr = addr + (PTRS_PER_PGD * PGDIR_SIZE);
+        while ((addr < last_addr) && (addr < end_addr)) {
+                struct page *page;
+                pud_t *level3p;
+
+                page = kimage_alloc_control_pages(image, 0);
+                if (!page) {
+                        result = -ENOMEM;
+                        goto out;
+                }
+                level3p = (pud_t *)page_address(page);
+                result = init_level3_page(image, level3p, addr, last_addr);
+                if (result) {
+                        goto out;
+                }
+                set_pgd(level4p++, __pgd(__pa(level3p) | _KERNPG_TABLE));
+                addr += PGDIR_SIZE;
+        }
+        /* clear the unused entries */
+        while (addr < end_addr) {
+                pgd_clear(level4p++);
+                addr += PGDIR_SIZE;
+        }
+out:
+        return result;
+}
+
+
+static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
+{
+        pgd_t *level4p;
+        level4p = (pgd_t *)__va(start_pgtable);
+        return init_level4_page(image, level4p, 0, end_pfn << PAGE_SHIFT);
+}
+
+static void set_idt(void *newidt, u16 limit)
+{
+        struct desc_ptr curidt;
+
+        /* x86-64 supports unaliged loads & stores */
+        curidt.size    = limit;
+        curidt.address = (unsigned long)newidt;
+
+        __asm__ __volatile__ (
+                "lidtq %0\n"
+                : : "m" (curidt)
+                );
+};
+
+
+static void set_gdt(void *newgdt, u16 limit)
+{
+        struct desc_ptr curgdt;
+
+        /* x86-64 supports unaligned loads & stores */
+        curgdt.size    = limit;
+        curgdt.address = (unsigned long)newgdt;
+
+        __asm__ __volatile__ (
+                "lgdtq %0\n"
+                : : "m" (curgdt)
+                );
+};
+
+static void load_segments(void)
+{
+        __asm__ __volatile__ (
+                "\tmovl %0,%%ds\n"
+                "\tmovl %0,%%es\n"
+                "\tmovl %0,%%ss\n"
+                "\tmovl %0,%%fs\n"
+                "\tmovl %0,%%gs\n"
+                : : "a" (__KERNEL_DS) : "memory"
+                );
+}
+
+int machine_kexec_prepare(struct kimage *image)
+{
+        unsigned long start_pgtable;
+        int result;
+
+        /* Calculate the offsets */
+        start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
+
+        /* Setup the identity mapped 64bit page table */
+        result = init_pgtable(image, start_pgtable);
+        if (result)
+                return result;
+
+        return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+        return;
+}
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+NORET_TYPE void machine_kexec(struct kimage *image)
+{
+        unsigned long page_list[PAGES_NR];
+        void *control_page;
+
+        /* Interrupts aren't acceptable while we reboot */
+        local_irq_disable();
+
+        control_page = page_address(image->control_code_page) + PAGE_SIZE;
+        memcpy(control_page, relocate_kernel, PAGE_SIZE);
+
+        page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page);
+        page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel;
+        page_list[PA_PGD] = virt_to_phys(&kexec_pgd);
+        page_list[VA_PGD] = (unsigned long)kexec_pgd;
+        page_list[PA_PUD_0] = virt_to_phys(&kexec_pud0);
+        page_list[VA_PUD_0] = (unsigned long)kexec_pud0;
+        page_list[PA_PMD_0] = virt_to_phys(&kexec_pmd0);
+        page_list[VA_PMD_0] = (unsigned long)kexec_pmd0;
+        page_list[PA_PTE_0] = virt_to_phys(&kexec_pte0);
+        page_list[VA_PTE_0] = (unsigned long)kexec_pte0;
+        page_list[PA_PUD_1] = virt_to_phys(&kexec_pud1);
+        page_list[VA_PUD_1] = (unsigned long)kexec_pud1;
+        page_list[PA_PMD_1] = virt_to_phys(&kexec_pmd1);
+        page_list[VA_PMD_1] = (unsigned long)kexec_pmd1;
+        page_list[PA_PTE_1] = virt_to_phys(&kexec_pte1);
+        page_list[VA_PTE_1] = (unsigned long)kexec_pte1;
+
+        page_list[PA_TABLE_PAGE] =
+          (unsigned long)__pa(page_address(image->control_code_page));
+
+        /* The segment registers are funny things, they have both a
+         * visible and an invisible part.  Whenever the visible part is
+         * set to a specific selector, the invisible part is loaded
+         * with from a table in memory.  At no other time is the
+         * descriptor table in memory accessed.
+         *
+         * I take advantage of this here by force loading the
+         * segments, before I zap the gdt with an invalid value.
+         */
+        load_segments();
+        /* The gdt & idt are now invalid.
+         * If you want to load them you must set up your own idt & gdt.
+         */
+        set_gdt(phys_to_virt(0),0);
+        set_idt(phys_to_virt(0),0);
+
+        /* now call it */
+        relocate_kernel((unsigned long)image->head, (unsigned long)page_list,
+                        image->start);
+}
+
+/* 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.
+ */
+static int __init setup_crashkernel(char *arg)
+{
+        unsigned long size, base;
+        char *p;
+        if (!arg)
+                return -EINVAL;
+        size = memparse(arg, &p);
+        if (arg == p)
+                return -EINVAL;
+        if (*p == '@') {
+                base = memparse(p+1, &p);
+                /* FIXME: Do I want a sanity check to validate the
+                 * memory range?  Yes you do, but it's too early for
+                 * e820 -AK */
+                crashk_res.start = base;
+                crashk_res.end   = base + size - 1;
+        }
+        return 0;
+}
+early_param("crashkernel", setup_crashkernel);
+