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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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3e15b01d69
Sponsored by: Netflix
186 lines
5.6 KiB
C
186 lines
5.6 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stand.h>
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#include <sys/param.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <machine/bootinfo.h>
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#include <machine/cpufunc.h>
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#include <machine/metadata.h>
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#include <machine/psl.h>
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#include <machine/specialreg.h>
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#include "bootstrap.h"
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#include "modinfo.h"
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#include "libi386.h"
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#include "btxv86.h"
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#ifdef LOADER_GELI_SUPPORT
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#include "geliboot.h"
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#endif
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/*
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* Check to see if this CPU supports long mode.
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*/
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static int
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bi_checkcpu(void)
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{
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char *cpu_vendor;
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int vendor[3];
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int eflags;
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unsigned int regs[4];
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/* Check for presence of "cpuid". */
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eflags = read_eflags();
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write_eflags(eflags ^ PSL_ID);
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if (!((eflags ^ read_eflags()) & PSL_ID))
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return (0);
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/* Fetch the vendor string. */
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do_cpuid(0, regs);
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vendor[0] = regs[1];
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vendor[1] = regs[3];
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vendor[2] = regs[2];
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cpu_vendor = (char *)vendor;
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/* Check for vendors that support AMD features. */
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if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 &&
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strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 &&
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strncmp(cpu_vendor, HYGON_VENDOR_ID, 12) != 0 &&
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strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0)
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return (0);
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/* Has to support AMD features. */
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do_cpuid(0x80000000, regs);
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if (!(regs[0] >= 0x80000001))
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return (0);
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/* Check for long mode. */
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do_cpuid(0x80000001, regs);
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return (regs[3] & AMDID_LM);
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}
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/*
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* Load the information expected by an amd64 kernel.
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*
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* - The 'boothowto' argument is constructed
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* - The 'bootdev' argument is constructed
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* - The 'bootinfo' struct is constructed, and copied into the kernel space.
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* - The kernel environment is copied into kernel space.
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* - Module metadata are formatted and placed in kernel space.
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*/
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int
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bi_load64(char *args, vm_offset_t *modulep,
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vm_offset_t *kernendp, int add_smap)
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{
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struct preloaded_file *xp, *kfp;
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struct i386_devdesc *rootdev;
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struct file_metadata *md;
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uint64_t kernend;
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uint64_t envp;
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uint64_t module;
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uint64_t addr;
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vm_offset_t size;
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char *rootdevname;
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int howto;
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if (!bi_checkcpu()) {
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printf("CPU doesn't support long mode\n");
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return (EINVAL);
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}
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howto = bi_getboothowto(args);
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/*
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* Allow the environment variable 'rootdev' to override the supplied device
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* This should perhaps go to MI code and/or have $rootdev tested/set by
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* MI code before launching the kernel.
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*/
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rootdevname = getenv("rootdev");
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i386_getdev((void **)(&rootdev), rootdevname, NULL);
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if (rootdev == NULL) { /* bad $rootdev/$currdev */
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printf("can't determine root device\n");
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return(EINVAL);
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}
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/* Try reading the /etc/fstab file to select the root device */
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getrootmount(devformat(&rootdev->dd));
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addr = 0;
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/* find the last module in the chain */
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for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
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if (addr < (xp->f_addr + xp->f_size))
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addr = xp->f_addr + xp->f_size;
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}
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/* pad to a page boundary */
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addr = roundup(addr, PAGE_SIZE);
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addr = build_font_module(addr);
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/* place the metadata before anything */
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module = *modulep = addr;
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kfp = file_findfile(NULL, "elf kernel");
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if (kfp == NULL)
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kfp = file_findfile(NULL, "elf64 kernel");
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if (kfp == NULL)
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panic("can't find kernel file");
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kernend = 0; /* fill it in later */
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file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
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file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
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file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
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file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof module, &module);
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if (add_smap != 0)
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bios_addsmapdata(kfp);
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#ifdef LOADER_GELI_SUPPORT
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geli_export_key_metadata(kfp);
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#endif
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bi_load_vbe_data(kfp);
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size = md_copymodules(0, true);
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/* copy our environment */
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envp = roundup(addr + size, PAGE_SIZE);
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addr = md_copyenv(envp);
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/* set kernend */
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kernend = roundup(addr, PAGE_SIZE);
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*kernendp = kernend;
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/* patch MODINFOMD_KERNEND */
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md = file_findmetadata(kfp, MODINFOMD_KERNEND);
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bcopy(&kernend, md->md_data, sizeof kernend);
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/* patch MODINFOMD_ENVP */
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md = file_findmetadata(kfp, MODINFOMD_ENVP);
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bcopy(&envp, md->md_data, sizeof envp);
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/* copy module list and metadata */
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(void)md_copymodules(*modulep, true);
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return(0);
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}
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