mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 11:36:49 +07:00
2d1b202762
To allow for a single kernel image on e500 v1/v2/mc we need to fixup lwsync at runtime. On e500v1/v2 lwsync causes an illop so we need to patch up the code. We default to 'sync' since that is always safe and if the cpu is capable we will replace 'sync' with 'lwsync'. We introduce CPU_FTR_LWSYNC as a way to determine at runtime if this is needed. This flag could be moved elsewhere since we dont really use it for the normal CPU_FTR purpose. Finally we only store the relative offset in the fixup section to keep it as small as possible rather than using a full fixup_entry. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/* Kernel module help for powerpc.
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Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
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Copyright (C) 2008 Freescale Semiconductor, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/elf.h>
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#include <linux/moduleloader.h>
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#include <linux/err.h>
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#include <linux/vmalloc.h>
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#include <linux/bug.h>
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#include <asm/module.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include <linux/sort.h>
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#include "setup.h"
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LIST_HEAD(module_bug_list);
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void *module_alloc(unsigned long size)
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{
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if (size == 0)
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return NULL;
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return vmalloc_exec(size);
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}
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/* Free memory returned from module_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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const char *name)
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{
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char *secstrings;
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unsigned int i;
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secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (i = 1; i < hdr->e_shnum; i++)
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if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
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return &sechdrs[i];
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return NULL;
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}
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs, struct module *me)
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{
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const Elf_Shdr *sect;
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int err;
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err = module_bug_finalize(hdr, sechdrs, me);
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if (err)
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return err;
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/* Apply feature fixups */
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sect = find_section(hdr, sechdrs, "__ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#ifdef CONFIG_PPC64
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sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(powerpc_firmware_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#endif
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sect = find_section(hdr, sechdrs, "__lwsync_fixup");
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if (sect != NULL)
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do_lwsync_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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module_bug_cleanup(mod);
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}
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struct bug_entry *module_find_bug(unsigned long bugaddr)
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{
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struct mod_arch_specific *mod;
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unsigned int i;
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struct bug_entry *bug;
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list_for_each_entry(mod, &module_bug_list, bug_list) {
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bug = mod->bug_table;
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for (i = 0; i < mod->num_bugs; ++i, ++bug)
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if (bugaddr == bug->bug_addr)
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return bug;
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}
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return NULL;
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}
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