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author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:15:21 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:15:21 +0200 |
commit | 6e04c835f1b9f1adde05b7439eaa1a4fff9ce8c7 (patch) | |
tree | 5812d8c28709f36af2b40364b3b4d70fc8ed2402 /arch/x86_64/kernel/machine_kexec.c | |
parent | e0a84f689b4373cbaa6d3a5bc5c52a613005fed1 (diff) | |
download | kernel_samsung_espresso10-6e04c835f1b9f1adde05b7439eaa1a4fff9ce8c7.zip kernel_samsung_espresso10-6e04c835f1b9f1adde05b7439eaa1a4fff9ce8c7.tar.gz kernel_samsung_espresso10-6e04c835f1b9f1adde05b7439eaa1a4fff9ce8c7.tar.bz2 |
x86_64: prepare shared kernel/machine_kexec.c
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86_64/kernel/machine_kexec.c')
-rw-r--r-- | arch/x86_64/kernel/machine_kexec.c | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/arch/x86_64/kernel/machine_kexec.c b/arch/x86_64/kernel/machine_kexec.c deleted file mode 100644 index c3a5547..0000000 --- a/arch/x86_64/kernel/machine_kexec.c +++ /dev/null @@ -1,259 +0,0 @@ -/* - * 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); - |