9411e24df3
This is a general cleanup of the relocatable kernel support on powerpc, needed to enable kernel ifuncs. * Fix some relocatable issues in the kernel linker, and change to using a RELOCATABLE_KERNEL #define instead of #ifdef __powerpc__ for parts that other platforms can use in the future if they wish to have ET_DYN kernels. * Get rid of the DB_STOFFS hack now that the kernel is relocated to the DMAP properly across the board on powerpc64. * Add powerpc64 and powerpc32 ifunc functionality. * Allow AIM64 virtual mode OF kernels to run from the DMAP like other AIM64 by implementing a virtual mode restart. This fixes the runtime address on PowerMac G5. * Fix symbol relocation problems on post-relocation kernels by relocating the symbol table. * Add an undocumented method for supplying kernel symbols on powernv and other powerpc machines using linux-style kernel/initrd loading -- If you pass the kernel in as the initrd as well, the copy resident in initrd will be used as a source for symbols when initializing the debugger. This method is subject to removal once we have a better way of doing this. Approved by: jhibbits Relnotes: yes Sponsored by: Tag1 Consulting, Inc. Differential Revision: https://reviews.freebsd.org/D23156
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/*-
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* Copyright (C) 2018 Breno Leitao
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/types.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include <machine/elf.h>
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#include <machine/param.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "opt_md.h"
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extern u_char *mfs_root;
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extern int mfs_root_size;
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static void ofw_initrd_probe_and_attach(void *junk);
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SYSINIT(ofw_initrd_probe_and_attach, SI_SUB_KMEM, SI_ORDER_ANY,
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ofw_initrd_probe_and_attach, NULL);
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static void
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ofw_initrd_probe_and_attach(void *junk)
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{
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phandle_t chosen;
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vm_paddr_t start, end;
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pcell_t cell[2];
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ssize_t size;
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u_char *taste;
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Elf_Ehdr ehdr;
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if (!hw_direct_map)
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return;
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chosen = OF_finddevice("/chosen");
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if (chosen <= 0)
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return;
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if (!OF_hasprop(chosen, "linux,initrd-start") ||
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!OF_hasprop(chosen, "linux,initrd-end"))
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return;
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size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
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if (size == 4)
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start = cell[0];
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else if (size == 8)
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start = (uint64_t)cell[0] << 32 | cell[1];
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else {
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printf("ofw_initrd: Wrong linux,initrd-start size\n");
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return;
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}
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size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
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if (size == 4)
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end = cell[0];
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else if (size == 8)
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end = (uint64_t)cell[0] << 32 | cell[1];
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else{
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printf("ofw_initrd: Wrong linux,initrd-end size\n");
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return;
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}
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if (end - start > 0) {
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taste = (u_char*) PHYS_TO_DMAP(start);
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memcpy(&ehdr, taste, sizeof(ehdr));
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if (IS_ELF(ehdr)) {
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printf("ofw_initrd: initrd is kernel image!\n");
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return;
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}
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mfs_root = taste;
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mfs_root_size = end - start;
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printf("ofw_initrd: initrd loaded at 0x%08lx-0x%08lx\n",
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start, end);
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}
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}
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