diff options
Diffstat (limited to 'arch/tile/kernel/machine_kexec.c')
| -rw-r--r-- | arch/tile/kernel/machine_kexec.c | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/arch/tile/kernel/machine_kexec.c b/arch/tile/kernel/machine_kexec.c deleted file mode 100644 index 008aa2faef55..000000000000 --- a/arch/tile/kernel/machine_kexec.c +++ /dev/null @@ -1,298 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * based on machine_kexec.c from other architectures in linux-2.6.18 - */ - -#include <linux/mm.h> -#include <linux/kexec.h> -#include <linux/delay.h> -#include <linux/reboot.h> -#include <linux/errno.h> -#include <linux/vmalloc.h> -#include <linux/cpumask.h> -#include <linux/kernel.h> -#include <linux/elf.h> -#include <linux/highmem.h> -#include <linux/mmu_context.h> -#include <linux/io.h> -#include <linux/timex.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/cacheflush.h> -#include <asm/checksum.h> -#include <asm/tlbflush.h> -#include <asm/homecache.h> -#include <hv/hypervisor.h> - - -/* - * This stuff is not in elf.h and is not in any other kernel include. - * This stuff is needed below in the little boot notes parser to - * extract the command line so we can pass it to the hypervisor. - */ -struct Elf32_Bhdr { - Elf32_Word b_signature; - Elf32_Word b_size; - Elf32_Half b_checksum; - Elf32_Half b_records; -}; -#define ELF_BOOT_MAGIC 0x0E1FB007 -#define EBN_COMMAND_LINE 0x00000004 -#define roundupsz(X) (((X) + 3) & ~3) - -/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ - - -void machine_shutdown(void) -{ - /* - * Normally we would stop all the other processors here, but - * the check in machine_kexec_prepare below ensures we'll only - * get this far if we've been booted with "nosmp" on the - * command line or without CONFIG_SMP so there's nothing to do - * here (for now). - */ -} - -void machine_crash_shutdown(struct pt_regs *regs) -{ - /* - * Cannot happen. This type of kexec is disabled on this - * architecture (and enforced in machine_kexec_prepare below). - */ -} - - -int machine_kexec_prepare(struct kimage *image) -{ - if (num_online_cpus() > 1) { - pr_warn("%s: detected attempt to kexec with num_online_cpus() > 1\n", - __func__); - return -ENOSYS; - } - if (image->type != KEXEC_TYPE_DEFAULT) { - pr_warn("%s: detected attempt to kexec with unsupported type: %d\n", - __func__, image->type); - return -ENOSYS; - } - return 0; -} - -void machine_kexec_cleanup(struct kimage *image) -{ - /* - * We did nothing in machine_kexec_prepare, - * so we have nothing to do here. - */ -} - -/* - * If we can find elf boot notes on this page, return the command - * line. Otherwise, silently return null. Somewhat kludgy, but no - * good way to do this without significantly rearchitecting the - * architecture-independent kexec code. - */ - -static unsigned char *kexec_bn2cl(void *pg) -{ - struct Elf32_Bhdr *bhdrp; - Elf32_Nhdr *nhdrp; - unsigned char *desc; - unsigned char *command_line; - __sum16 csum; - - bhdrp = (struct Elf32_Bhdr *) pg; - - /* - * This routine is invoked for every source page, so make - * sure to quietly ignore every impossible page. - */ - if (bhdrp->b_signature != ELF_BOOT_MAGIC || - bhdrp->b_size > PAGE_SIZE) - return 0; - - /* - * If we get a checksum mismatch, warn with the checksum - * so we can diagnose better. - */ - csum = ip_compute_csum(pg, bhdrp->b_size); - if (csum != 0) { - pr_warn("%s: bad checksum %#x (size %d)\n", - __func__, csum, bhdrp->b_size); - return 0; - } - - nhdrp = (Elf32_Nhdr *) (bhdrp + 1); - - while (nhdrp->n_type != EBN_COMMAND_LINE) { - - desc = (unsigned char *) (nhdrp + 1); - desc += roundupsz(nhdrp->n_descsz); - - nhdrp = (Elf32_Nhdr *) desc; - - /* still in bounds? */ - if ((unsigned char *) (nhdrp + 1) > - ((unsigned char *) pg) + bhdrp->b_size) { - - pr_info("%s: out of bounds\n", __func__); - return 0; - } - } - - command_line = (unsigned char *) (nhdrp + 1); - desc = command_line; - - while (*desc != '\0') { - desc++; - if (((unsigned long)desc & PAGE_MASK) != (unsigned long)pg) { - pr_info("%s: ran off end of page\n", __func__); - return 0; - } - } - - return command_line; -} - -static void kexec_find_and_set_command_line(struct kimage *image) -{ - kimage_entry_t *ptr, entry; - - unsigned char *command_line = 0; - unsigned char *r; - HV_Errno hverr; - - for (ptr = &image->head; - (entry = *ptr) && !(entry & IND_DONE); - ptr = (entry & IND_INDIRECTION) ? - phys_to_virt((entry & PAGE_MASK)) : ptr + 1) { - - if ((entry & IND_SOURCE)) { - void *va = - kmap_atomic_pfn(entry >> PAGE_SHIFT); - r = kexec_bn2cl(va); - if (r) { - command_line = r; - break; - } - kunmap_atomic(va); - } - } - - if (command_line != 0) { - pr_info("setting new command line to \"%s\"\n", command_line); - - hverr = hv_set_command_line( - (HV_VirtAddr) command_line, strlen(command_line)); - kunmap_atomic(command_line); - } else { - pr_info("%s: no command line found; making empty\n", __func__); - hverr = hv_set_command_line((HV_VirtAddr) command_line, 0); - } - if (hverr) - pr_warn("%s: hv_set_command_line returned error: %d\n", - __func__, hverr); -} - -/* - * The kexec code range-checks all its PAs, so to avoid having it run - * amok and allocate memory and then sequester it from every other - * controller, we force it to come from controller zero. We also - * disable the oom-killer since if we do end up running out of memory, - * that almost certainly won't help. - */ -struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order) -{ - gfp_mask |= __GFP_THISNODE | __GFP_NORETRY; - return alloc_pages_node(0, gfp_mask, order); -} - -/* - * Address range in which pa=va mapping is set in setup_quasi_va_is_pa(). - * For tilepro, PAGE_OFFSET is used since this is the largest possbile value - * for tilepro, while for tilegx, we limit it to entire middle level page - * table which we assume has been allocated and is undoubtedly large enough. - */ -#ifndef __tilegx__ -#define QUASI_VA_IS_PA_ADDR_RANGE PAGE_OFFSET -#else -#define QUASI_VA_IS_PA_ADDR_RANGE PGDIR_SIZE -#endif - -static void setup_quasi_va_is_pa(void) -{ - HV_PTE pte; - unsigned long i; - - /* - * Flush our TLB to prevent conflicts between the previous contents - * and the new stuff we're about to add. - */ - local_flush_tlb_all(); - - /* - * setup VA is PA, at least up to QUASI_VA_IS_PA_ADDR_RANGE. - * Note here we assume that level-1 page table is defined by - * HPAGE_SIZE. - */ - pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE); - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3); - for (i = 0; i < (QUASI_VA_IS_PA_ADDR_RANGE >> HPAGE_SHIFT); i++) { - unsigned long vaddr = i << HPAGE_SHIFT; - pgd_t *pgd = pgd_offset(current->mm, vaddr); - pud_t *pud = pud_offset(pgd, vaddr); - pte_t *ptep = (pte_t *) pmd_offset(pud, vaddr); - unsigned long pfn = i << (HPAGE_SHIFT - PAGE_SHIFT); - - if (pfn_valid(pfn)) - __set_pte(ptep, pfn_pte(pfn, pte)); - } -} - - -void machine_kexec(struct kimage *image) -{ - void *reboot_code_buffer; - pte_t *ptep; - void (*rnk)(unsigned long, void *, unsigned long) - __noreturn; - - /* Mask all interrupts before starting to reboot. */ - interrupt_mask_set_mask(~0ULL); - - kexec_find_and_set_command_line(image); - - /* - * Adjust the home caching of the control page to be cached on - * this cpu, and copy the assembly helper into the control - * code page, which we map in the vmalloc area. - */ - homecache_change_page_home(image->control_code_page, 0, - smp_processor_id()); - reboot_code_buffer = page_address(image->control_code_page); - BUG_ON(reboot_code_buffer == NULL); - ptep = virt_to_pte(NULL, (unsigned long)reboot_code_buffer); - __set_pte(ptep, pte_mkexec(*ptep)); - memcpy(reboot_code_buffer, relocate_new_kernel, - relocate_new_kernel_size); - __flush_icache_range( - (unsigned long) reboot_code_buffer, - (unsigned long) reboot_code_buffer + relocate_new_kernel_size); - - setup_quasi_va_is_pa(); - - /* now call it */ - rnk = reboot_code_buffer; - (*rnk)(image->head, reboot_code_buffer, image->start); -} |