machine_kexec.c

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/*
 * arch/ia64/kernel/machine_kexec.c
 *
 * Handle transition of Linux booting another kernel
 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
 * Copyright (C) 2005 Khalid Aziz <[email protected]>
 * Copyright (C) 2006 Intel Corp, Zou Nan hai <[email protected]>
 *
 * 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/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
#include <linux/numa.h>
#include <linux/mmzone.h>

#include <asm/numa.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
#include <asm/meminit.h>
#include <asm/processor.h>
#include <asm/sal.h>
#include <asm/mca.h>

typedef void (*relocate_new_kernel_t)(
                    unsigned long indirection_page,
                    unsigned long start_address,
                    struct ia64_boot_param *boot_param,
                    unsigned long pal_addr) __noreturn;

struct kimage *ia64_kimage;

struct resource efi_memmap_res = {
        .name  = "EFI Memory Map",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};

struct resource boot_param_res = {
        .name  = "Boot parameter",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};


/*
 * Do what every setup is needed on image and the
 * reboot code buffer to allow us to avoid allocations
 * later.
 */
int machine_kexec_prepare(struct kimage *image)
{
    void *control_code_buffer;
    const unsigned long *func;

    func = (unsigned long *)&relocate_new_kernel;
    /* Pre-load control code buffer to minimize work in kexec path */
    control_code_buffer = page_address(image->control_code_page);
    memcpy((void *)control_code_buffer, (const void *)func[0],
            relocate_new_kernel_size);
    flush_icache_range((unsigned long)control_code_buffer,
            (unsigned long)control_code_buffer + relocate_new_kernel_size);
    ia64_kimage = image;

    return 0;
}

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.
 */
static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
{
    struct kimage *image = arg;
    relocate_new_kernel_t rnk;
    void *pal_addr = efi_get_pal_addr();
    unsigned long code_addr;
    int ii;
    u64 fp, gp;
    ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;

    BUG_ON(!image);
    code_addr = (unsigned long)page_address(image->control_code_page);
    if (image->type == KEXEC_TYPE_CRASH) {
        crash_save_this_cpu();
        current->thread.ksp = (__u64)info->sw - 16;

        /* Register noop init handler */
        fp = ia64_tpa(init_handler->fp);
        gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
        ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
    } else {
        /* Unregister init handlers of current kernel */
        ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
    }

    /* Unregister mca handler - No more recovery on current kernel */
    ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);

    /* Interrupts aren't acceptable while we reboot */
    local_irq_disable();

    /* Mask CMC and Performance Monitor interrupts */
    ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
    ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);

    /* Mask ITV and Local Redirect Registers */
    ia64_set_itv(1 << 16);
    ia64_set_lrr0(1 << 16);
    ia64_set_lrr1(1 << 16);

    /* terminate possible nested in-service interrupts */
    for (ii = 0; ii < 16; ii++)
        ia64_eoi();

    /* unmask TPR and clear any pending interrupts */
    ia64_setreg(_IA64_REG_CR_TPR, 0);
    ia64_srlz_d();
    while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
        ia64_eoi();
    platform_kernel_launch_event();
    rnk = (relocate_new_kernel_t)&code_addr;
    (*rnk)(image->head, image->start, ia64_boot_param,
             GRANULEROUNDDOWN((unsigned long) pal_addr));
    BUG();
}

void machine_kexec(struct kimage *image)
{
    BUG_ON(!image);
    unw_init_running(ia64_machine_kexec, image);
    for(;;);
}

void arch_crash_save_vmcoreinfo(void)
{
#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
    VMCOREINFO_SYMBOL(pgdat_list);
    VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
#endif
#ifdef CONFIG_NUMA
    VMCOREINFO_SYMBOL(node_memblk);
    VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
    VMCOREINFO_STRUCT_SIZE(node_memblk_s);
    VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
    VMCOREINFO_OFFSET(node_memblk_s, size);
#endif
#ifdef CONFIG_PGTABLE_3
    VMCOREINFO_CONFIG(PGTABLE_3);
#elif defined(CONFIG_PGTABLE_4)
    VMCOREINFO_CONFIG(PGTABLE_4);
#endif
}

unsigned long paddr_vmcoreinfo_note(void)
{
    return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
}