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head/stand/i386/isoboot/isoboot.c

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/*-
* 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 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;
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;
int main(void);
static void load(void);
static int parse_cmds(char *, int *);
static uint8_t ls, dsk_meta;
static uint32_t fs_off;
#include "cd9660read.c"
static inline int
xfsread(uint64_t inode, void *buf, size_t nbyte)
{
if ((size_t)cd9660_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;
}
}
int
main(void)
{
char cmd[512], cmdtmp[512];
ssize_t sz;
int autoboot, dskupdated;
uint64_t ino;
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 *)
(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
heap_end = (char *)PTOV(bios_basemem);
}
setheap(heap_next, heap_end);
v86.ctl = V86_FLAGS;
v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
dsk.drive = *(uint8_t *)PTOV(ARGS);
dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
dsk.unit = dsk.drive & DRV_MASK;
dsk.part = -1;
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 = dsk.drive;
autoboot = 1;
*cmd = '\0';
for (;;) {
*kname = '\0';
if ((ino = cd9660_lookup(PATH_CONFIG)) ||
(ino = cd9660_lookup(PATH_DOTCONFIG))) {
sz = cd9660_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 (!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();
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: ",
dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
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;
}
load();
}
/* NOTREACHED */
}
/* Needed so btxld can link us properly; 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;
uint64_t ino;
uint32_t addr, x;
int fmt, i, j;
if (!(ino = cd9660_lookup(kname))) {
if (!ls) {
printf("%s: No %s on %u:%s(%up%u)\n", BOOTPROG,
kname, dsk.drive & DRV_MASK, dev_nm[dsk.type],
dsk.unit,
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 = dsk.drive;
__exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.unit, 0),
KARGS_FLAGS_EXTARG, 0, 0, VTOP(&bootinfo));
}
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);
}