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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e9e7870f90
The new boot data struct shall replace global variables OLDMEM_BASE and OLDMEM_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
170 lines
4 KiB
C
170 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OS info memory interface
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*
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* Copyright IBM Corp. 2012
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* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#define KMSG_COMPONENT "os_info"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/crash_dump.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <asm/checksum.h>
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#include <asm/lowcore.h>
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#include <asm/os_info.h>
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/*
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* OS info structure has to be page aligned
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*/
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static struct os_info os_info __page_aligned_data;
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/*
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* Compute checksum over OS info structure
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*/
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u32 os_info_csum(struct os_info *os_info)
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{
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int size = sizeof(*os_info) - offsetof(struct os_info, version_major);
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return (__force u32)csum_partial(&os_info->version_major, size, 0);
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}
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/*
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* Add crashkernel info to OS info and update checksum
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*/
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void os_info_crashkernel_add(unsigned long base, unsigned long size)
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{
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os_info.crashkernel_addr = (u64)(unsigned long)base;
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os_info.crashkernel_size = (u64)(unsigned long)size;
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os_info.csum = os_info_csum(&os_info);
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}
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/*
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* Add OS info entry and update checksum
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*/
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void os_info_entry_add(int nr, void *ptr, u64 size)
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{
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os_info.entry[nr].addr = (u64)(unsigned long)ptr;
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os_info.entry[nr].size = size;
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os_info.entry[nr].csum = (__force u32)csum_partial(ptr, size, 0);
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os_info.csum = os_info_csum(&os_info);
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}
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/*
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* Initialize OS info structure and set lowcore pointer
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*/
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void __init os_info_init(void)
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{
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void *ptr = &os_info;
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os_info.version_major = OS_INFO_VERSION_MAJOR;
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os_info.version_minor = OS_INFO_VERSION_MINOR;
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os_info.magic = OS_INFO_MAGIC;
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os_info.csum = os_info_csum(&os_info);
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mem_assign_absolute(S390_lowcore.os_info, (unsigned long) ptr);
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}
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#ifdef CONFIG_CRASH_DUMP
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static struct os_info *os_info_old;
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/*
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* Allocate and copy OS info entry from oldmem
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*/
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static void os_info_old_alloc(int nr, int align)
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{
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unsigned long addr, size = 0;
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char *buf, *buf_align, *msg;
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u32 csum;
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addr = os_info_old->entry[nr].addr;
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if (!addr) {
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msg = "not available";
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goto fail;
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}
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size = os_info_old->entry[nr].size;
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buf = kmalloc(size + align - 1, GFP_KERNEL);
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if (!buf) {
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msg = "alloc failed";
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goto fail;
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}
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buf_align = PTR_ALIGN(buf, align);
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if (copy_oldmem_kernel(buf_align, (void *) addr, size)) {
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msg = "copy failed";
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goto fail_free;
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}
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csum = (__force u32)csum_partial(buf_align, size, 0);
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if (csum != os_info_old->entry[nr].csum) {
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msg = "checksum failed";
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goto fail_free;
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}
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os_info_old->entry[nr].addr = (u64)(unsigned long)buf_align;
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msg = "copied";
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goto out;
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fail_free:
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kfree(buf);
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fail:
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os_info_old->entry[nr].addr = 0;
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out:
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pr_info("entry %i: %s (addr=0x%lx size=%lu)\n",
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nr, msg, addr, size);
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}
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/*
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* Initialize os info and os info entries from oldmem
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*/
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static void os_info_old_init(void)
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{
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static int os_info_init;
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unsigned long addr;
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if (os_info_init)
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return;
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if (!oldmem_data.start)
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goto fail;
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if (copy_oldmem_kernel(&addr, &S390_lowcore.os_info, sizeof(addr)))
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goto fail;
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if (addr == 0 || addr % PAGE_SIZE)
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goto fail;
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os_info_old = kzalloc(sizeof(*os_info_old), GFP_KERNEL);
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if (!os_info_old)
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goto fail;
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if (copy_oldmem_kernel(os_info_old, (void *) addr,
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sizeof(*os_info_old)))
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goto fail_free;
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if (os_info_old->magic != OS_INFO_MAGIC)
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goto fail_free;
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if (os_info_old->csum != os_info_csum(os_info_old))
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goto fail_free;
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if (os_info_old->version_major > OS_INFO_VERSION_MAJOR)
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goto fail_free;
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os_info_old_alloc(OS_INFO_VMCOREINFO, 1);
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os_info_old_alloc(OS_INFO_REIPL_BLOCK, 1);
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pr_info("crashkernel: addr=0x%lx size=%lu\n",
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(unsigned long) os_info_old->crashkernel_addr,
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(unsigned long) os_info_old->crashkernel_size);
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os_info_init = 1;
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return;
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fail_free:
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kfree(os_info_old);
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fail:
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os_info_init = 1;
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os_info_old = NULL;
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}
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/*
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* Return pointer to os infor entry and its size
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*/
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void *os_info_old_entry(int nr, unsigned long *size)
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{
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os_info_old_init();
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if (!os_info_old)
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return NULL;
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if (!os_info_old->entry[nr].addr)
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return NULL;
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*size = (unsigned long) os_info_old->entry[nr].size;
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return (void *)(unsigned long)os_info_old->entry[nr].addr;
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}
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#endif
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