2010-05-28 21:09:12 -06:00
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/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* based on machine_kexec.c from other architectures in linux-2.6.18
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*/
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/errno.h>
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#include <linux/vmalloc.h>
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#include <linux/cpumask.h>
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#include <linux/kernel.h>
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#include <linux/elf.h>
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#include <linux/highmem.h>
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#include <linux/mmu_context.h>
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#include <linux/io.h>
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#include <linux/timex.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/checksum.h>
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#include <hv/hypervisor.h>
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/*
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* This stuff is not in elf.h and is not in any other kernel include.
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* This stuff is needed below in the little boot notes parser to
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* extract the command line so we can pass it to the hypervisor.
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*/
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struct Elf32_Bhdr {
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Elf32_Word b_signature;
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Elf32_Word b_size;
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Elf32_Half b_checksum;
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Elf32_Half b_records;
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};
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#define ELF_BOOT_MAGIC 0x0E1FB007
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#define EBN_COMMAND_LINE 0x00000004
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#define roundupsz(X) (((X) + 3) & ~3)
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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void machine_shutdown(void)
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{
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/*
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* Normally we would stop all the other processors here, but
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* the check in machine_kexec_prepare below ensures we'll only
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* get this far if we've been booted with "nosmp" on the
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* command line or without CONFIG_SMP so there's nothing to do
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* here (for now).
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*/
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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/*
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* Cannot happen. This type of kexec is disabled on this
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* architecture (and enforced in machine_kexec_prepare below).
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*/
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}
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int machine_kexec_prepare(struct kimage *image)
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{
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if (num_online_cpus() > 1) {
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2010-06-25 15:04:17 -06:00
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pr_warning("%s: detected attempt to kexec "
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2010-05-28 21:09:12 -06:00
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"with num_online_cpus() > 1\n",
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__func__);
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return -ENOSYS;
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}
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if (image->type != KEXEC_TYPE_DEFAULT) {
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2010-06-25 15:04:17 -06:00
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pr_warning("%s: detected attempt to kexec "
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2010-05-28 21:09:12 -06:00
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"with unsupported type: %d\n",
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__func__,
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image->type);
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return -ENOSYS;
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}
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return 0;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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/*
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* We did nothing in machine_kexec_prepare,
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* so we have nothing to do here.
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*/
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}
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/*
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* If we can find elf boot notes on this page, return the command
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* line. Otherwise, silently return null. Somewhat kludgy, but no
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* good way to do this without significantly rearchitecting the
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* architecture-independent kexec code.
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*/
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static unsigned char *kexec_bn2cl(void *pg)
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{
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struct Elf32_Bhdr *bhdrp;
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Elf32_Nhdr *nhdrp;
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unsigned char *desc;
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unsigned char *command_line;
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__sum16 csum;
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bhdrp = (struct Elf32_Bhdr *) pg;
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/*
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* This routine is invoked for every source page, so make
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* sure to quietly ignore every impossible page.
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*/
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if (bhdrp->b_signature != ELF_BOOT_MAGIC ||
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bhdrp->b_size > PAGE_SIZE)
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return 0;
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/*
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* If we get a checksum mismatch, warn with the checksum
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* so we can diagnose better.
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2010-05-28 21:09:12 -06:00
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*/
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csum = ip_compute_csum(pg, bhdrp->b_size);
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if (csum != 0) {
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pr_warning("%s: bad checksum %#x (size %d)\n",
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__func__, csum, bhdrp->b_size);
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2010-05-28 21:09:12 -06:00
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return 0;
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}
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nhdrp = (Elf32_Nhdr *) (bhdrp + 1);
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while (nhdrp->n_type != EBN_COMMAND_LINE) {
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desc = (unsigned char *) (nhdrp + 1);
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desc += roundupsz(nhdrp->n_descsz);
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nhdrp = (Elf32_Nhdr *) desc;
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/* still in bounds? */
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if ((unsigned char *) (nhdrp + 1) >
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((unsigned char *) pg) + bhdrp->b_size) {
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2010-06-25 15:04:17 -06:00
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pr_info("%s: out of bounds\n", __func__);
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2010-05-28 21:09:12 -06:00
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return 0;
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}
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}
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command_line = (unsigned char *) (nhdrp + 1);
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desc = command_line;
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while (*desc != '\0') {
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desc++;
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if (((unsigned long)desc & PAGE_MASK) != (unsigned long)pg) {
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pr_info("%s: ran off end of page\n",
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2010-05-28 21:09:12 -06:00
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__func__);
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return 0;
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}
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}
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return command_line;
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}
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static void kexec_find_and_set_command_line(struct kimage *image)
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{
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kimage_entry_t *ptr, entry;
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unsigned char *command_line = 0;
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unsigned char *r;
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HV_Errno hverr;
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for (ptr = &image->head;
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(entry = *ptr) && !(entry & IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt((entry & PAGE_MASK)) : ptr + 1) {
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if ((entry & IND_SOURCE)) {
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void *va =
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kmap_atomic_pfn(entry >> PAGE_SHIFT);
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r = kexec_bn2cl(va);
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if (r) {
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command_line = r;
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break;
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}
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2010-11-01 13:21:35 -06:00
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kunmap_atomic(va);
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2010-05-28 21:09:12 -06:00
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}
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}
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if (command_line != 0) {
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pr_info("setting new command line to \"%s\"\n",
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command_line);
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hverr = hv_set_command_line(
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(HV_VirtAddr) command_line, strlen(command_line));
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kunmap_atomic(command_line);
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} else {
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pr_info("%s: no command line found; making empty\n",
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__func__);
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hverr = hv_set_command_line((HV_VirtAddr) command_line, 0);
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}
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if (hverr)
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pr_warning("%s: hv_set_command_line returned error: %d\n",
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__func__, hverr);
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2010-05-28 21:09:12 -06:00
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}
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/*
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* The kexec code range-checks all its PAs, so to avoid having it run
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* amok and allocate memory and then sequester it from every other
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* controller, we force it to come from controller zero. We also
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* disable the oom-killer since if we do end up running out of memory,
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* that almost certainly won't help.
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*/
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struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order)
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{
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gfp_mask |= __GFP_THISNODE | __GFP_NORETRY;
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return alloc_pages_node(0, gfp_mask, order);
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}
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static void setup_quasi_va_is_pa(void)
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{
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HV_PTE *pgtable;
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HV_PTE pte;
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int i;
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/*
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* Flush our TLB to prevent conflicts between the previous contents
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* and the new stuff we're about to add.
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*/
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local_flush_tlb_all();
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/* setup VA is PA, at least up to PAGE_OFFSET */
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pgtable = (HV_PTE *)current->mm->pgd;
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pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE);
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pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3);
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for (i = 0; i < pgd_index(PAGE_OFFSET); i++)
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pgtable[i] = pfn_pte(i << (HPAGE_SHIFT - PAGE_SHIFT), pte);
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}
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NORET_TYPE void machine_kexec(struct kimage *image)
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{
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void *reboot_code_buffer;
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NORET_TYPE void (*rnk)(unsigned long, void *, unsigned long)
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ATTRIB_NORET;
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/* Mask all interrupts before starting to reboot. */
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interrupt_mask_set_mask(~0ULL);
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kexec_find_and_set_command_line(image);
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/*
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* Adjust the home caching of the control page to be cached on
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* this cpu, and copy the assembly helper into the control
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* code page, which we map in the vmalloc area.
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*/
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homecache_change_page_home(image->control_code_page, 0,
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smp_processor_id());
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reboot_code_buffer = vmap(&image->control_code_page, 1, 0,
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__pgprot(_PAGE_KERNEL | _PAGE_EXECUTABLE));
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memcpy(reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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__flush_icache_range(
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(unsigned long) reboot_code_buffer,
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(unsigned long) reboot_code_buffer + relocate_new_kernel_size);
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setup_quasi_va_is_pa();
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/* now call it */
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rnk = reboot_code_buffer;
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(*rnk)(image->head, reboot_code_buffer, image->start);
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}
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