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freebsd-skq/stand/i386/gptboot/gptboot.c
Kyle Evans 4e6c8e6d83 isoboot, gptboot: Fix WITHOUT_LOADER_GELI (gptboot) and isoboot in general 
gptboot was broken when r316078 added the LOADER_GELI_SUPPORT #ifdef to
not pass geliargs via __exec.  KARGS_FLAGS_EXTARG must not be used if we're
not going to pass an additional argument to __exec.

PR:		228151
Submitted by:	guyyur@gmail.com
MFC after:	1 week
2018-08-09 02:06:25 +00:00

658 lines
14 KiB
C
Raw Blame History

/*-
* Copyright (c) 1998 Robert Nordier
* All rights reserved.
*
* Redistribution and use in source and binary forms are freely
* permitted provided that the above copyright notice and this
* paragraph and the following disclaimer are duplicated in all
* such forms.
*
* This software is provided "AS IS" and without any express or
* implied warranties, including, without limitation, the implied
* warranties of merchantability and fitness for a particular
* purpose.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/gpt.h>
#include <sys/dirent.h>
#include <sys/reboot.h>
#include <machine/bootinfo.h>
#include <machine/elf.h>
#include <machine/pc/bios.h>
#include <machine/psl.h>
#include <stdarg.h>
#include <a.out.h>
#include <btxv86.h>
#include "stand.h"
#include "bootargs.h"
#include "lib.h"
#include "rbx.h"
#include "drv.h"
#include "cons.h"
#include "gpt.h"
#include "paths.h"
#define ARGS 0x900
#define NOPT 14
#define NDEV 3
#define MEM_BASE 0x12
#define MEM_EXT 0x15
#define DRV_HARD 0x80
#define DRV_MASK 0x7f
#define TYPE_AD 0
#define TYPE_DA 1
#define TYPE_MAXHARD TYPE_DA
#define TYPE_FD 2
extern uint32_t _end;
static const uuid_t freebsd_ufs_uuid = GPT_ENT_TYPE_FREEBSD_UFS;
static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */
static const unsigned char flags[NOPT] = {
RBX_DUAL,
RBX_SERIAL,
RBX_ASKNAME,
RBX_CDROM,
RBX_CONFIG,
RBX_KDB,
RBX_GDB,
RBX_MUTE,
RBX_NOINTR,
RBX_PAUSE,
RBX_QUIET,
RBX_DFLTROOT,
RBX_SINGLE,
RBX_VERBOSE
};
uint32_t opts;
static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
static const unsigned char dev_maj[NDEV] = {30, 4, 2};
static struct dsk dsk;
static char kname[1024];
static int comspeed = SIOSPD;
static struct bootinfo bootinfo;
#ifdef LOADER_GELI_SUPPORT
static struct geli_boot_args geliargs;
#endif
static vm_offset_t high_heap_base;
static uint32_t bios_basemem, bios_extmem, high_heap_size;
static struct bios_smap smap;
/*
* The minimum amount of memory to reserve in bios_extmem for the heap.
*/
#define HEAP_MIN (3 * 1024 * 1024)
static char *heap_next;
static char *heap_end;
static void load(void);
static int parse_cmds(char *, int *);
static int dskread(void *, daddr_t, unsigned);
#ifdef LOADER_GELI_SUPPORT
static int vdev_read(void *vdev __unused, void *priv, off_t off, void *buf,
size_t bytes);
#endif
#include "ufsread.c"
#include "gpt.c"
#ifdef LOADER_GELI_SUPPORT
#include "geliboot.h"
static char gelipw[GELI_PW_MAXLEN];
static struct keybuf *gelibuf;
#endif
struct gptdsk {
struct dsk dsk;
#ifdef LOADER_GELI_SUPPORT
struct geli_dev *gdev;
#endif
};
static struct gptdsk gdsk;
static inline int
xfsread(ufs_ino_t inode, void *buf, size_t nbyte)
{
if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
printf("Invalid %s\n", "format");
return (-1);
}
return (0);
}
static void
bios_getmem(void)
{
uint64_t size;
/* Parse system memory map */
v86.ebx = 0;
do {
v86.ctl = V86_FLAGS;
v86.addr = MEM_EXT; /* int 0x15 function 0xe820*/
v86.eax = 0xe820;
v86.ecx = sizeof(struct bios_smap);
v86.edx = SMAP_SIG;
v86.es = VTOPSEG(&smap);
v86.edi = VTOPOFF(&smap);
v86int();
if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
break;
/* look for a low-memory segment that's large enough */
if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) &&
(smap.length >= (512 * 1024)))
bios_basemem = smap.length;
/* look for the first segment in 'extended' memory */
if ((smap.type == SMAP_TYPE_MEMORY) &&
(smap.base == 0x100000)) {
bios_extmem = smap.length;
}
/*
* Look for the largest segment in 'extended' memory beyond
* 1MB but below 4GB.
*/
if ((smap.type == SMAP_TYPE_MEMORY) &&
(smap.base > 0x100000) && (smap.base < 0x100000000ull)) {
size = smap.length;
/*
* If this segment crosses the 4GB boundary,
* truncate it.
*/
if (smap.base + size > 0x100000000ull)
size = 0x100000000ull - smap.base;
if (size > high_heap_size) {
high_heap_size = size;
high_heap_base = smap.base;
}
}
} while (v86.ebx != 0);
/* Fall back to the old compatibility function for base memory */
if (bios_basemem == 0) {
v86.ctl = 0;
v86.addr = 0x12; /* int 0x12 */
v86int();
bios_basemem = (v86.eax & 0xffff) * 1024;
}
/*
* Fall back through several compatibility functions for extended
* memory
*/
if (bios_extmem == 0) {
v86.ctl = V86_FLAGS;
v86.addr = 0x15; /* int 0x15 function 0xe801*/
v86.eax = 0xe801;
v86int();
if (!(v86.efl & 1)) {
bios_extmem = ((v86.ecx & 0xffff) +
((v86.edx & 0xffff) * 64)) * 1024;
}
}
if (bios_extmem == 0) {
v86.ctl = 0;
v86.addr = 0x15; /* int 0x15 function 0x88*/
v86.eax = 0x8800;
v86int();
bios_extmem = (v86.eax & 0xffff) * 1024;
}
/*
* If we have extended memory and did not find a suitable heap
* region in the SMAP, use the last 3MB of 'extended' memory as a
* high heap candidate.
*/
if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) {
high_heap_size = HEAP_MIN;
high_heap_base = bios_extmem + 0x100000 - HEAP_MIN;
}
}
static int
gptinit(void)
{
if (gptread(&freebsd_ufs_uuid, &gdsk.dsk, dmadat->secbuf) == -1) {
printf("%s: unable to load GPT\n", BOOTPROG);
return (-1);
}
if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, gdsk.dsk.part) == -1) {
printf("%s: no UFS partition was found\n", BOOTPROG);
return (-1);
}
#ifdef LOADER_GELI_SUPPORT
gdsk.gdev = geli_taste(vdev_read, &gdsk.dsk,
(gpttable[curent].ent_lba_end - gpttable[curent].ent_lba_start),
"disk%up%u:", gdsk.dsk.unit, curent + 1);
if (gdsk.gdev != NULL) {
if (geli_havekey(gdsk.gdev) != 0 &&
geli_passphrase(gdsk.gdev, gelipw) != 0) {
printf("%s: unable to decrypt GELI key\n", BOOTPROG);
return (-1);
}
}
#endif
dsk_meta = 0;
return (0);
}
int main(void);
int
main(void)
{
char cmd[512], cmdtmp[512];
ssize_t sz;
int autoboot, dskupdated;
ufs_ino_t ino;
dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
bios_getmem();
if (high_heap_size > 0) {
heap_end = PTOV(high_heap_base + high_heap_size);
heap_next = PTOV(high_heap_base);
} else {
heap_next = (char *)dmadat + sizeof(*dmadat);
heap_end = (char *)PTOV(bios_basemem);
}
setheap(heap_next, heap_end);
v86.ctl = V86_FLAGS;
v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
gdsk.dsk.drive = *(uint8_t *)PTOV(ARGS);
gdsk.dsk.type = gdsk.dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
gdsk.dsk.unit = gdsk.dsk.drive & DRV_MASK;
gdsk.dsk.part = -1;
gdsk.dsk.start = 0;
bootinfo.bi_version = BOOTINFO_VERSION;
bootinfo.bi_size = sizeof(bootinfo);
bootinfo.bi_basemem = bios_basemem / 1024;
bootinfo.bi_extmem = bios_extmem / 1024;
bootinfo.bi_memsizes_valid++;
bootinfo.bi_bios_dev = gdsk.dsk.drive;
/* Process configuration file */
if (gptinit() != 0)
return (-1);
autoboot = 1;
*cmd = '\0';
for (;;) {
*kname = '\0';
if ((ino = lookup(PATH_CONFIG)) ||
(ino = lookup(PATH_DOTCONFIG))) {
sz = fsread(ino, cmd, sizeof(cmd) - 1);
cmd[(sz < 0) ? 0 : sz] = '\0';
}
if (*cmd != '\0') {
memcpy(cmdtmp, cmd, sizeof(cmdtmp));
if (parse_cmds(cmdtmp, &dskupdated))
break;
if (dskupdated && gptinit() != 0)
break;
if (!OPT_CHECK(RBX_QUIET))
printf("%s: %s", PATH_CONFIG, cmd);
*cmd = '\0';
}
if (autoboot && keyhit(3)) {
if (*kname == '\0')
memcpy(kname, PATH_LOADER, sizeof(PATH_LOADER));
break;
}
autoboot = 0;
/*
* Try to exec stage 3 boot loader. If interrupted by a
* keypress, or in case of failure, try to load a kernel
* directly instead.
*/
if (*kname != '\0')
load();
memcpy(kname, PATH_LOADER, sizeof(PATH_LOADER));
load();
memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
load();
gptbootfailed(&gdsk.dsk);
if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, -1) == -1)
break;
dsk_meta = 0;
}
/* Present the user with the boot2 prompt. */
for (;;) {
if (!OPT_CHECK(RBX_QUIET)) {
printf("\nFreeBSD/x86 boot\n"
"Default: %u:%s(%up%u)%s\n"
"boot: ",
gdsk.dsk.drive & DRV_MASK, dev_nm[gdsk.dsk.type],
gdsk.dsk.unit, gdsk.dsk.part, kname);
}
if (ioctrl & IO_SERIAL)
sio_flush();
*cmd = '\0';
if (keyhit(0))
getstr(cmd, sizeof(cmd));
else if (!OPT_CHECK(RBX_QUIET))
putchar('\n');
if (parse_cmds(cmd, &dskupdated)) {
putchar('\a');
continue;
}
if (dskupdated && gptinit() != 0)
continue;
load();
}
/* NOTREACHED */
}
/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
void
exit(int x)
{
while (1);
__unreachable();
}
static void
load(void)
{
union {
struct exec ex;
Elf32_Ehdr eh;
} hdr;
static Elf32_Phdr ep[2];
static Elf32_Shdr es[2];
caddr_t p;
ufs_ino_t ino;
uint32_t addr, x;
int fmt, i, j;
if (!(ino = lookup(kname))) {
if (!ls) {
printf("%s: No %s on %u:%s(%up%u)\n", BOOTPROG,
kname, gdsk.dsk.drive & DRV_MASK,
dev_nm[gdsk.dsk.type], gdsk.dsk.unit,
gdsk.dsk.part);
}
return;
}
if (xfsread(ino, &hdr, sizeof(hdr)))
return;
if (N_GETMAGIC(hdr.ex) == ZMAGIC)
fmt = 0;
else if (IS_ELF(hdr.eh))
fmt = 1;
else {
printf("Invalid %s\n", "format");
return;
}
if (fmt == 0) {
addr = hdr.ex.a_entry & 0xffffff;
p = PTOV(addr);
fs_off = PAGE_SIZE;
if (xfsread(ino, p, hdr.ex.a_text))
return;
p += roundup2(hdr.ex.a_text, PAGE_SIZE);
if (xfsread(ino, p, hdr.ex.a_data))
return;
p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
bootinfo.bi_symtab = VTOP(p);
memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
p += sizeof(hdr.ex.a_syms);
if (hdr.ex.a_syms) {
if (xfsread(ino, p, hdr.ex.a_syms))
return;
p += hdr.ex.a_syms;
if (xfsread(ino, p, sizeof(int)))
return;
x = *(uint32_t *)p;
p += sizeof(int);
x -= sizeof(int);
if (xfsread(ino, p, x))
return;
p += x;
}
} else {
fs_off = hdr.eh.e_phoff;
for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
if (xfsread(ino, ep + j, sizeof(ep[0])))
return;
if (ep[j].p_type == PT_LOAD)
j++;
}
for (i = 0; i < 2; i++) {
p = PTOV(ep[i].p_paddr & 0xffffff);
fs_off = ep[i].p_offset;
if (xfsread(ino, p, ep[i].p_filesz))
return;
}
p += roundup2(ep[1].p_memsz, PAGE_SIZE);
bootinfo.bi_symtab = VTOP(p);
if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
(hdr.eh.e_shstrndx + 1);
if (xfsread(ino, &es, sizeof(es)))
return;
for (i = 0; i < 2; i++) {
memcpy(p, &es[i].sh_size,
sizeof(es[i].sh_size));
p += sizeof(es[i].sh_size);
fs_off = es[i].sh_offset;
if (xfsread(ino, p, es[i].sh_size))
return;
p += es[i].sh_size;
}
}
addr = hdr.eh.e_entry & 0xffffff;
}
bootinfo.bi_esymtab = VTOP(p);
bootinfo.bi_kernelname = VTOP(kname);
bootinfo.bi_bios_dev = gdsk.dsk.drive;
#ifdef LOADER_GELI_SUPPORT
geliargs.size = sizeof(geliargs);
explicit_bzero(gelipw, sizeof(gelipw));
gelibuf = malloc(sizeof(struct keybuf) +
(GELI_MAX_KEYS * sizeof(struct keybuf_ent)));
geli_export_key_buffer(gelibuf);
geliargs.notapw = '\0';
geliargs.keybuf_sentinel = KEYBUF_SENTINEL;
geliargs.keybuf = gelibuf;
#endif
__exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
MAKEBOOTDEV(dev_maj[gdsk.dsk.type], gdsk.dsk.part + 1, gdsk.dsk.unit, 0xff),
#ifdef LOADER_GELI_SUPPORT
KARGS_FLAGS_EXTARG, 0, 0, VTOP(&bootinfo), geliargs
#else
0, 0, 0, VTOP(&bootinfo)
#endif
);
}
static int
parse_cmds(char *cmdstr, int *dskupdated)
{
char *arg;
char *ep, *p, *q;
const char *cp;
unsigned int drv;
int c, i, j;
arg = cmdstr;
*dskupdated = 0;
while ((c = *arg++)) {
if (c == ' ' || c == '\t' || c == '\n')
continue;
for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++);
ep = p;
if (*p)
*p++ = 0;
if (c == '-') {
while ((c = *arg++)) {
if (c == 'P') {
if (*(uint8_t *)PTOV(0x496) & 0x10) {
cp = "yes";
} else {
opts |= OPT_SET(RBX_DUAL) |
OPT_SET(RBX_SERIAL);
cp = "no";
}
printf("Keyboard: %s\n", cp);
continue;
} else if (c == 'S') {
j = 0;
while ((unsigned int)(i = *arg++ - '0')
<= 9)
j = j * 10 + i;
if (j > 0 && i == -'0') {
comspeed = j;
break;
}
/*
* Fall through to error below
* ('S' not in optstr[]).
*/
}
for (i = 0; c != optstr[i]; i++)
if (i == NOPT - 1)
return (-1);
opts ^= OPT_SET(flags[i]);
}
ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) :
OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD;
if (ioctrl & IO_SERIAL) {
if (sio_init(115200 / comspeed) != 0)
ioctrl &= ~IO_SERIAL;
}
} else {
for (q = arg--; *q && *q != '('; q++);
if (*q) {
drv = -1;
if (arg[1] == ':') {
drv = *arg - '0';
if (drv > 9)
return (-1);
arg += 2;
}
if (q - arg != 2)
return (-1);
for (i = 0; arg[0] != dev_nm[i][0] ||
arg[1] != dev_nm[i][1]; i++)
if (i == NDEV - 1)
return (-1);
dsk.type = i;
arg += 3;
dsk.unit = *arg - '0';
if (arg[1] != 'p' || dsk.unit > 9)
return (-1);
arg += 2;
dsk.part = *arg - '0';
if (dsk.part < 1 || dsk.part > 9)
return (-1);
arg++;
if (arg[0] != ')')
return (-1);
arg++;
if (drv == -1)
drv = dsk.unit;
dsk.drive = (dsk.type <= TYPE_MAXHARD
? DRV_HARD : 0) + drv;
*dskupdated = 1;
}
if ((i = ep - arg)) {
if ((size_t)i >= sizeof(kname))
return (-1);
memcpy(kname, arg, i + 1);
}
}
arg = p;
}
return (0);
}
static int
dskread(void *buf, daddr_t lba, unsigned nblk)
{
int err;
err = drvread(&gdsk.dsk, buf, lba + gdsk.dsk.start, nblk);
#ifdef LOADER_GELI_SUPPORT
if (err == 0 && gdsk.gdev != NULL) {
/* Decrypt */
if (geli_read(gdsk.gdev, lba * DEV_BSIZE, buf,
nblk * DEV_BSIZE))
return (err);
}
#endif
return (err);
}
#ifdef LOADER_GELI_SUPPORT
/*
* Read function compatible with the ZFS callback, required to keep the GELI
* implementation the same for both UFS and ZFS.
*/
static int
vdev_read(void *vdev __unused, void *priv, off_t off, void *buf, size_t bytes)
{
char *p;
daddr_t lba;
unsigned int nb;
struct gptdsk *dskp;
dskp = (struct gptdsk *)priv;
if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1)))
return (-1);
p = buf;
lba = off / DEV_BSIZE;
lba += dskp->dsk.start;
while (bytes > 0) {
nb = bytes / DEV_BSIZE;
if (nb > VBLKSIZE / DEV_BSIZE)
nb = VBLKSIZE / DEV_BSIZE;
if (drvread(&dskp->dsk, dmadat->blkbuf, lba, nb))
return (-1);
memcpy(p, dmadat->blkbuf, nb * DEV_BSIZE);
p += nb * DEV_BSIZE;
lba += nb;
bytes -= nb * DEV_BSIZE;
}
return (0);
}
#endif /* LOADER_GELI_SUPPORT */
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