254 lines
7.5 KiB
C
254 lines
7.5 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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/psl.h>
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#include <machine/specialreg.h>
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#include "bootstrap.h"
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#include "libi386.h"
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#include "btxv86.h"
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/*
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* Copy module-related data into the load area, where it can be
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* used as a directory for loaded modules.
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*
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* Module data is presented in a self-describing format. Each datum
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* is preceded by a 32-bit identifier and a 32-bit size field.
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*
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* Currently, the following data are saved:
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*
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* MOD_NAME (variable) module name (string)
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* MOD_TYPE (variable) module type (string)
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* MOD_ARGS (variable) module parameters (string)
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* MOD_ADDR sizeof(vm_offset_t) module load address
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* MOD_SIZE sizeof(size_t) module size
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* MOD_METADATA (variable) type-specific metadata
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*/
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#define COPY32(v, a, c) { \
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u_int32_t x = (v); \
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if (c) \
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i386_copyin(&x, a, sizeof(x)); \
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a += sizeof(x); \
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}
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#define MOD_STR(t, a, s, c) { \
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COPY32(t, a, c); \
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COPY32(strlen(s) + 1, a, c); \
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if (c) \
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i386_copyin(s, a, strlen(s) + 1); \
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a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
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}
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#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
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#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
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#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
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#define MOD_VAR(t, a, s, c) { \
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COPY32(t, a, c); \
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COPY32(sizeof(s), a, c); \
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if (c) \
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i386_copyin(&s, a, sizeof(s)); \
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a += roundup(sizeof(s), sizeof(u_int64_t)); \
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}
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#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
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#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
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#define MOD_METADATA(a, mm, c) { \
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COPY32(MODINFO_METADATA | mm->md_type, a, c); \
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COPY32(mm->md_size, a, c); \
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if (c) \
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i386_copyin(mm->md_data, a, mm->md_size); \
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a += roundup(mm->md_size, sizeof(u_int64_t));\
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}
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#define MOD_END(a, c) { \
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COPY32(MODINFO_END, a, c); \
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COPY32(0, a, c); \
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}
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static vm_offset_t
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bi_copymodules64(vm_offset_t addr)
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{
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struct preloaded_file *fp;
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struct file_metadata *md;
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int c;
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u_int64_t v;
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c = addr != 0;
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/* start with the first module on the list, should be the kernel */
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for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
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MOD_NAME(addr, fp->f_name, c); /* this field must come first */
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MOD_TYPE(addr, fp->f_type, c);
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if (fp->f_args)
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MOD_ARGS(addr, fp->f_args, c);
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v = fp->f_addr;
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MOD_ADDR(addr, v, c);
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v = fp->f_size;
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MOD_SIZE(addr, v, c);
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for (md = fp->f_metadata; md != NULL; md = md->md_next)
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if (!(md->md_type & MODINFOMD_NOCOPY))
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MOD_METADATA(addr, md, c);
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}
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MOD_END(addr, c);
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return(addr);
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}
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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, 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, 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, vm_offset_t *kernendp)
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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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vm_offset_t addr;
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u_int64_t kernend;
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u_int64_t envp;
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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(i386_fmtdev((void *)rootdev));
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/* find the last module in the chain */
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addr = 0;
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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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/* copy our environment */
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envp = addr;
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addr = bi_copyenv(addr);
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/* pad to a page boundary */
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addr = roundup(addr, PAGE_SIZE);
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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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bios_addsmapdata(kfp);
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/* Figure out the size and location of the metadata */
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*modulep = addr;
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size = bi_copymodules64(0);
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kernend = roundup(addr + size, 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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/* copy module list and metadata */
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(void)bi_copymodules64(addr);
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return(0);
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}
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