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machine_kexec_32.c
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/* * 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/delay.h> #include <linux/init.h> #include <linux/numa.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/tlbflush.h> #include <asm/mmu_context.h> #include <asm/io.h> #include <asm/apic.h> #include <asm/cpufeature.h> #include <asm/desc.h> #include <asm/system.h> #define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE))) static u32 kexec_pgd[1024] PAGE_ALIGNED; #ifdef CONFIG_X86_PAE static u32 kexec_pmd0[1024] PAGE_ALIGNED; static u32 kexec_pmd1[1024] PAGE_ALIGNED; #endif static u32 kexec_pte0[1024] PAGE_ALIGNED; static u32 kexec_pte1[1024] PAGE_ALIGNED; static void set_idt(void *newidt, __u16 limit) { struct Xgt_desc_struct curidt; /* ia32 supports unaliged loads & stores */ curidt.size = limit; curidt.address = (unsigned long)newidt; load_idt(&curidt); }; static void set_gdt(void *newgdt, __u16 limit) { struct Xgt_desc_struct curgdt; /* ia32 supports unaligned loads & stores */ curgdt.size = limit; curgdt.address = (unsigned long)newgdt; load_gdt(&curgdt); }; static void load_segments(void) { #define __STR(X) #X #define STR(X) __STR(X) __asm__ __volatile__ ( "\tljmp $"STR(__KERNEL_CS)",$1f\n" "\t1:\n" "\tmovl $"STR(__KERNEL_DS)",%%eax\n" "\tmovl %%eax,%%ds\n" "\tmovl %%eax,%%es\n" "\tmovl %%eax,%%fs\n" "\tmovl %%eax,%%gs\n" "\tmovl %%eax,%%ss\n" ::: "eax", "memory"); #undef STR #undef __STR } /* * A architecture hook called to validate the * proposed image and prepare the control pages * as needed. The pages for KEXEC_CONTROL_CODE_SIZE * have been allocated, but the segments have yet * been copied into the kernel. * * Do what every setup is needed on image and the * reboot code buffer to allow us to avoid allocations * later. * * Currently nothing. */ int machine_kexec_prepare(struct kimage *image) { return 0; } /* * Undo anything leftover by machine_kexec_prepare * when an image is freed. */ void machine_kexec_cleanup(struct kimage *image) { } /* * 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); memcpy(control_page, relocate_kernel, PAGE_SIZE); page_list[PA_CONTROL_PAGE] = __pa(control_page); page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel; page_list[PA_PGD] = __pa(kexec_pgd); page_list[VA_PGD] = (unsigned long)kexec_pgd; #ifdef CONFIG_X86_PAE page_list[PA_PMD_0] = __pa(kexec_pmd0); page_list[VA_PMD_0] = (unsigned long)kexec_pmd0; page_list[PA_PMD_1] = __pa(kexec_pmd1); page_list[VA_PMD_1] = (unsigned long)kexec_pmd1; #endif page_list[PA_PTE_0] = __pa(kexec_pte0); page_list[VA_PTE_0] = (unsigned long)kexec_pte0; page_list[PA_PTE_1] = __pa(kexec_pte1); page_list[VA_PTE_1] = (unsigned long)kexec_pte1; /* 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, cpu_has_pae); } void arch_crash_save_vmcoreinfo(void) { #ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE VMCOREINFO_SYMBOL(node_data); VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); #endif #ifdef CONFIG_X86_PAE VMCOREINFO_CONFIG(X86_PAE); #endif }
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