LXR linux/arch/ia64/kernel/machine

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/ia64/kernel/machine_kexec.c
   4 *
   5 * Handle transition of Linux booting another kernel
   6 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
   7 * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
   8 * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
   9 */
  10
  11#include <linux/mm.h>
  12#include <linux/kexec.h>
  13#include <linux/cpu.h>
  14#include <linux/irq.h>
  15#include <linux/efi.h>
  16#include <linux/numa.h>
  17#include <linux/mmzone.h>
  18
  19#include <asm/efi.h>
  20#include <asm/numa.h>
  21#include <asm/mmu_context.h>
  22#include <asm/setup.h>
  23#include <asm/delay.h>
  24#include <asm/meminit.h>
  25#include <asm/processor.h>
  26#include <asm/sal.h>
  27#include <asm/mca.h>
  28
  29typedef void (*relocate_new_kernel_t)(
  30                                        unsigned long indirection_page,
  31                                        unsigned long start_address,
  32                                        struct ia64_boot_param *boot_param,
  33                                        unsigned long pal_addr) __noreturn;
  34
  35struct kimage *ia64_kimage;
  36
  37struct resource efi_memmap_res = {
  38        .name  = "EFI Memory Map",
  39        .start = 0,
  40        .end   = 0,
  41        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  42};
  43
  44struct resource boot_param_res = {
  45        .name  = "Boot parameter",
  46        .start = 0,
  47        .end   = 0,
  48        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  49};
  50
  51
  52/*
  53 * Do what every setup is needed on image and the
  54 * reboot code buffer to allow us to avoid allocations
  55 * later.
  56 */
  57int machine_kexec_prepare(struct kimage *image)
  58{
  59        void *control_code_buffer;
  60        const unsigned long *func;
  61
  62        func = (unsigned long *)&relocate_new_kernel;
  63        /* Pre-load control code buffer to minimize work in kexec path */
  64        control_code_buffer = page_address(image->control_code_page);
  65        memcpy((void *)control_code_buffer, (const void *)func[0],
  66                        relocate_new_kernel_size);
  67        flush_icache_range((unsigned long)control_code_buffer,
  68                        (unsigned long)control_code_buffer + relocate_new_kernel_size);
  69        ia64_kimage = image;
  70
  71        return 0;
  72}
  73
  74void machine_kexec_cleanup(struct kimage *image)
  75{
  76}
  77
  78/*
  79 * Do not allocate memory (or fail in any way) in machine_kexec().
  80 * We are past the point of no return, committed to rebooting now.
  81 */
  82static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  83{
  84        struct kimage *image = arg;
  85        relocate_new_kernel_t rnk;
  86        void *pal_addr = efi_get_pal_addr();
  87        unsigned long code_addr;
  88        int ii;
  89        u64 fp, gp;
  90        ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
  91
  92        BUG_ON(!image);
  93        code_addr = (unsigned long)page_address(image->control_code_page);
  94        if (image->type == KEXEC_TYPE_CRASH) {
  95                crash_save_this_cpu();
  96                current->thread.ksp = (__u64)info->sw - 16;
  97
  98                /* Register noop init handler */
  99                fp = ia64_tpa(init_handler->fp);
 100                gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
 101                ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
 102        } else {
 103                /* Unregister init handlers of current kernel */
 104                ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 105        }
 106
 107        /* Unregister mca handler - No more recovery on current kernel */
 108        ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
 109
 110        /* Interrupts aren't acceptable while we reboot */
 111        local_irq_disable();
 112
 113        /* Mask CMC and Performance Monitor interrupts */
 114        ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
 115        ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
 116
 117        /* Mask ITV and Local Redirect Registers */
 118        ia64_set_itv(1 << 16);
 119        ia64_set_lrr0(1 << 16);
 120        ia64_set_lrr1(1 << 16);
 121
 122        /* terminate possible nested in-service interrupts */
 123        for (ii = 0; ii < 16; ii++)
 124                ia64_eoi();
 125
 126        /* unmask TPR and clear any pending interrupts */
 127        ia64_setreg(_IA64_REG_CR_TPR, 0);
 128        ia64_srlz_d();
 129        while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 130                ia64_eoi();
 131        rnk = (relocate_new_kernel_t)&code_addr;
 132        (*rnk)(image->head, image->start, ia64_boot_param,
 133                     GRANULEROUNDDOWN((unsigned long) pal_addr));
 134        BUG();
 135}
 136
 137void machine_kexec(struct kimage *image)
 138{
 139        BUG_ON(!image);
 140        unw_init_running(ia64_machine_kexec, image);
 141        for(;;);
 142}
 143
 144void arch_crash_save_vmcoreinfo(void)
 145{
 146#if defined(CONFIG_SPARSEMEM)
 147        VMCOREINFO_SYMBOL(pgdat_list);
 148        VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 149#endif
 150#ifdef CONFIG_NUMA
 151        VMCOREINFO_SYMBOL(node_memblk);
 152        VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 153        VMCOREINFO_STRUCT_SIZE(node_memblk_s);
 154        VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 155        VMCOREINFO_OFFSET(node_memblk_s, size);
 156#endif
 157#if CONFIG_PGTABLE_LEVELS == 3
 158        VMCOREINFO_CONFIG(PGTABLE_3);
 159#elif CONFIG_PGTABLE_LEVELS == 4
 160        VMCOREINFO_CONFIG(PGTABLE_4);
 161#endif
 162}
 163
 164