shithub: vmxsmp

Download patch

ref: 4a28392169ffedfff514d54d4039e048dd0562d8
parent: e62b1e38428082d5ad17a51bdff25b16c1db3caf
author: glenda <glenda@fileserver>
date: Sat Dec 27 22:41:21 EST 2025 

missing ksetup.c


--- /dev/null
+++ b/ksetup.c
@@ -1,0 +1,947 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <libsec.h>
+#include "dat.h"
+#include "fns.h"
+#include "x86.h"
+
+static uchar hdr[8192];
+static int fd;
+
+extern int bootmodn;
+extern char **bootmod;
+extern int cmdlinen;
+extern char **cmdlinev;
+extern VgaMode *curmode, textmode;
+extern uintptr fbaddr, fbsz;
+
+static int elf64;
+
+static int
+biostype(Region *r)
+{
+	return r->type >> 8 & 0xff;
+}
+
+static void *
+pack(void *v, char *fmt, ...)
+{
+	uchar *p;
+	va_list va;
+	
+	p = v;
+	va_start(va, fmt);
+	for(; *fmt != 0; fmt++)
+		switch(*fmt){
+		case '.': p++; break;
+		case 's': PUT16(p, 0, va_arg(va, int)); p += 2; break;
+		case 'i': PUT32(p, 0, va_arg(va, u32int)); p += 4; break;
+		case 'v': PUT64(p, 0, va_arg(va, u64int)); p += 8; break;
+		case 'z': if(elf64) {PUT64(p, 0, va_arg(va, uintptr)); p += 8;} else {PUT32(p, 0, va_arg(va, uintptr)); p += 4;} break;
+		default: sysfatal("pack: unknown fmt character %c", *fmt);
+		}
+	va_end(va);
+	return p;
+}
+
+static int
+putmmap(uchar *p0)
+{
+	uchar *p;
+	Region *r;
+	int t;
+	
+	p = p0;
+	for(r = mmap; r != nil; r = r->next){
+		t = biostype(r);
+		if(t == 0) continue;
+		if(gavail(p) < 24) sysfatal("out of guest memory");
+		p = pack(p, "ivvi", 20, (uvlong) r->start, (uvlong)(r->end - r->start), t);
+	}
+	return (uchar *) p - p0;
+}
+
+static int
+putcmdline(uchar *p0)
+{
+	int i;
+	char *p, *e;
+	
+	if(cmdlinen == 0) return 0;
+	p = (char*)p0;
+	e = gend(p0);
+	if(p >= e) return 0;
+	for(i = 0; i < cmdlinen; i++){
+		p = strecpy(p, e, cmdlinev[i]);
+		if(i != cmdlinen - 1) *p++ = ' ';
+	}
+	return p - (char*)p0 + 1;
+}
+
+static int
+putmods(uchar *p0)
+{
+	int i, fd, rc;
+	u32int *p;
+	uchar *q;
+	char dummy;
+
+	if(bootmodn == 0) return 0;
+	p = (u32int*)p0;
+	q = (uchar*)(p + 4 * bootmodn);
+	for(i = 0; i < bootmodn; i++){
+		q = gptr(-(-gpa(q) & -BY2PG), 1);
+		if(q == nil) sysfatal("out of guest memory");
+		fd = open(bootmod[i], OREAD);
+		if(fd == -1) sysfatal("module open: %r");
+		p[0] = gpa(q);
+		rc = readn(fd, q, gavail(q));
+		if(rc < 0) sysfatal("module read: %r");
+		if(read(fd, &dummy, 1) == 1) sysfatal("out of guest memory");
+		close(fd);
+		q += rc;
+		p[1] = gpa(q);
+		p[2] = 0;
+		p[3] = 0;
+		p += 4;
+	}
+	bootmodn = ((uchar*)p - p0) / 16;
+	return q - p0;
+}
+
+static int
+trymultiboot(void)
+{
+	u32int *p, flags;
+	u32int header, load, loadend, bssend, entry;
+	u32int filestart;
+	uchar *gp;
+	uchar *modp;
+	int len;
+	int rc;
+
+	for(p = (u32int*)hdr; p < (u32int*)hdr + sizeof(hdr)/4; p++)
+		if(*p == 0x1badb002)
+			break;
+	if(p == (u32int*)hdr + sizeof(hdr)/4)
+		return 0;
+	if((u32int)(p[0] + p[1] + p[2]) != 0)
+		sysfatal("invalid multiboot checksum");
+	flags = p[1];
+	if((flags & 1<<16) == 0)
+		sysfatal("no size info in multiboot header");
+	header = p[3];
+	load = p[4];
+	loadend = p[5];
+	bssend = p[6];
+	entry = p[7];
+	filestart = (uchar*)p - hdr - (header - load);
+	gp = gptr(load, bssend != 0 ? bssend - load : loadend != 0 ? loadend - load : BY2PG);
+	if(gp == nil)
+		sysfatal("kernel image out of bounds");
+	seek(fd, filestart, 0);
+	if(loadend == 0){
+		rc = readn(fd, gp, gavail(gp));
+		if(rc <= 0) sysfatal("readn: %r");
+		loadend = load + rc;
+	}else{
+		rc = readn(fd, gp, loadend - load);
+		if(rc < 0) sysfatal("readn: %r");
+		if(rc < loadend - load) sysfatal("short kernel image");
+	}
+	if(bssend == 0) bssend = loadend;
+	bssend = -(-bssend & -BY2PG);
+	p = gptr(bssend, 128);
+	if(p == nil) sysfatal("no space for multiboot structure");
+	memset(p, 0, 128);
+	p[0] = 1<<0;
+	p[1] = gavail(gptr(0, 0)) >> 10;
+	if(p[1] > 640) p[1] = 640;
+	p[2] = gavail(gptr(1048576, 0)) >> 10;	
+	modp = gptr(bssend + 128, 1);
+	if(modp == nil) sysfatal("out of guest memory");
+	len = putmmap(modp);
+	if(len != 0){
+		p[0] |= 1<<6;
+		p[11] = len;
+		p[12] = gpa(modp);
+		modp += len;
+	}
+	len = putcmdline(modp);
+	if(len != 0){
+		p[0] |= 1<<2;
+		p[4] = gpa(modp);
+		modp += len + 7 & -8;
+	}
+	len = putmods(modp);
+	if(len != 0){
+		p[0] |= 1<<3;
+		p[5] = bootmodn;
+		p[6] = gpa(modp);
+		modp += len + 7 & -8;
+	}
+
+	if(curmode != nil && curmode != &textmode){
+		int i, o, n;
+		u16int r, g, b;
+
+		o = 0;
+		r = g = b = 0;
+		for(i = 0; i < 4; i++){
+			n = curmode->chan >> 8*i & 0xf;
+			if(n == 0) continue;
+			switch(curmode->chan >> 4 + 8*i & 0xf){
+			case CRed:	r = o | n<<8; break;
+			case CGreen:	g = o | n<<8; break;
+			case CBlue:	b = o | n<<8; break;
+			}
+			o += n;
+		}
+		p[0] |= 1<<12;
+		pack(&p[22], "viiiisss", (u64int)fbaddr,
+			curmode->hbytes, curmode->w, curmode->h,
+			chantodepth(curmode->chan) | 1<<8, r, g, b);
+	}
+
+	USED(modp);
+	rset(RPC, entry);
+	rset(RAX, 0x2badb002);
+	rset(RBX, bssend);
+	return 1;
+}
+
+typedef struct ELFHeader ELFHeader;
+struct ELFHeader {
+	uintptr entry, phoff, shoff;
+	u32int flags;
+	u16int ehsize;
+	u16int phentsize, phnum;
+	u16int shentsize, shnum, shstrndx;
+};
+typedef struct ELFPHeader ELFPHeader;
+struct ELFPHeader {
+	u32int type, flags;
+	uintptr offset, vaddr, paddr, filesz, memsz, align;
+};
+enum {
+	PT_NULL, PT_LOAD, PT_DYNAMIC, PT_INTERP, PT_NOTE,
+	PT_SHLIB, PT_PHDR, PT_TLS,
+	PT_GNU_EH_FRAME = 0x6474e550,
+	PT_GNU_RELRO = 0x6474e552,
+	PT_OPENBSD_RANDOMIZE = 0x65a3dbe6,
+};
+typedef struct ELFSHeader ELFSHeader;
+struct ELFSHeader {
+	u32int iname, type;
+	uintptr flags, addr, offset, size;
+	u32int link, info;
+	uintptr addralign, entsize;
+	char *name;
+};
+enum {
+	SHT_SYMTAB = 2,
+	SHT_STRTAB = 3,
+	SHF_ALLOC = 2,
+};
+typedef struct ELFSymbol ELFSymbol;
+struct ELFSymbol {
+	u32int iname;
+	uintptr addr, size;
+	u8int info, other;
+	u16int shndx;
+	char *name;
+};
+static ELFHeader eh;
+static ELFPHeader *ph;
+static ELFSHeader *sh;
+static ELFSymbol *sym;
+static int nsym;
+static uintptr elfmax;
+
+static u64int
+elff(uchar **p, uchar *e, int sz)
+{
+	u64int rc;
+
+	if(sz == -1)
+		sz = elf64 ? 8 : 4;
+	if(*p + sz > e){
+		fprint(2, "out of bounds: %#p > %#p", *p + sz, e);
+		return 0;
+	}
+	switch(sz){
+	case 1: rc = GET8(*p, 0); break;
+	case 2: rc = GET16(*p, 0); break;
+	case 3: case 4: rc = GET32(*p, 0); break;
+	default: rc = GET64(*p, 0); break;
+	}
+	*p += sz;
+	return rc;
+}
+
+static void
+elfheader(ELFHeader *eh, uchar *p, uchar *e)
+{
+	eh->entry = elff(&p, e, -1);
+	eh->phoff = elff(&p, e, -1);
+	eh->shoff = elff(&p, e, -1);
+	eh->flags = elff(&p, e, 4);
+	eh->ehsize = elff(&p, e, 2);
+	eh->phentsize = elff(&p, e, 2);
+	eh->phnum = elff(&p, e, 2);
+	eh->shentsize = elff(&p, e, 2);
+	eh->shnum = elff(&p, e, 2);
+	eh->shstrndx = elff(&p, e, 2);
+}
+
+static void
+elfpheader(ELFPHeader *ph, uchar *p, uchar *e)
+{
+	ph->type = elff(&p, e, 4);
+	if(elf64) ph->flags = elff(&p, e, 4);
+	ph->offset = elff(&p, e, -1);
+	ph->vaddr = elff(&p, e, -1);
+	ph->paddr = elff(&p, e, -1);
+	ph->filesz = elff(&p, e, -1);
+	ph->memsz = elff(&p, e, -1);
+	if(!elf64) ph->flags = elff(&p, e, 4);
+	ph->align = elff(&p, e, -1);
+}
+
+static void
+elfsheader(ELFSHeader *sh, uchar *p, uchar *e)
+{
+	sh->iname = elff(&p, e, 4);
+	sh->type = elff(&p, e, 4);
+	sh->flags = elff(&p, e, -1);
+	sh->addr = elff(&p, e, -1);
+	sh->offset = elff(&p, e, -1);
+	sh->size = elff(&p, e, -1);
+	sh->link = elff(&p, e, 4);
+	sh->info = elff(&p, e, 4);
+	sh->addralign = elff(&p, e, -1);
+	sh->entsize = elff(&p, e, -1);
+}
+
+static void
+elfsymbol(ELFSymbol *s, uchar *p, uchar *e)
+{
+	s->iname = elff(&p, e, 4);
+	if(elf64){
+		s->info = elff(&p, e, 1);
+		s->other = elff(&p, e, 1);
+		s->shndx = elff(&p, e, 2);
+		s->addr = elff(&p, e, -1);
+		s->size = elff(&p, e, -1);
+	}else{
+		s->addr = elff(&p, e, -1);
+		s->size = elff(&p, e, -1);
+		s->info = elff(&p, e, 1);
+		s->other = elff(&p, e, 1);
+		s->shndx = elff(&p, e, 2);
+	}
+}
+
+static void
+epreadn(void *buf, ulong sz, vlong off, char *fn)
+{
+	seek(fd, off, 0);
+	werrstr("eof");
+	if(readn(fd, buf, sz) < sz)
+		sysfatal("%s: read: %r", fn);
+}
+
+static int
+elfheaders(void)
+{
+	uchar *buf;
+	int i;
+	ELFSHeader *s;
+
+	if(GET32(hdr, 0) != 0x464c457f) return 0;
+	if(hdr[5] != 1 || hdr[6] != 1 || hdr[0x14] != 1) return 0;
+	switch(hdr[4]){
+	case 1: elf64 = 0; break;
+	case 2: elf64 = 1; if(sizeof(uintptr) == 4) sysfatal("64-bit binaries not supported on 32-bit host"); break;
+	default: return 0;
+	}
+	elfheader(&eh, hdr + 0x18, hdr + sizeof(hdr));
+	buf = emalloc(eh.phentsize > eh.shentsize ? eh.phentsize : eh.shentsize);
+	ph = emalloc(sizeof(ELFPHeader) * eh.phnum);
+	for(i = 0; i < eh.phnum; i++){
+		epreadn(buf, eh.phentsize, eh.phoff + i * eh.phentsize, "elfheaders");
+		elfpheader(&ph[i], buf, buf + eh.phentsize);
+	}
+	sh = emalloc(sizeof(ELFSHeader) * eh.shnum);
+	for(i = 0; i < eh.shnum; i++){
+		epreadn(buf, eh.shentsize, eh.shoff + i * eh.shentsize, "elfheaders");
+		elfsheader(&sh[i], buf, buf + eh.shentsize);
+	}
+	free(buf);
+	
+	if(eh.shstrndx != 0 && eh.shstrndx < eh.shnum){
+		s = &sh[eh.shstrndx];
+		if(s->type != SHT_STRTAB)
+			sysfatal("elfheaders: section string table is not a string table");
+		buf = emalloc(s->size + 1);
+		epreadn(buf, s->size, s->offset, "elfheaders");
+		for(i = 0; i < eh.shnum; i++){
+			if(sh[i].iname < s->size)
+				sh[i].name = (char *) &buf[sh[i].iname];
+		}
+	}
+	
+	return 1;
+}
+
+static void
+elfdata(void)
+{
+	int i;
+	void *v;
+
+	for(i = 0; i < eh.phnum; i++){
+		switch(ph[i].type){
+		case PT_NULL:
+		case PT_GNU_RELRO:
+		case PT_NOTE:
+			continue;
+		case PT_DYNAMIC:
+		case PT_INTERP:
+			sysfatal("elf: dynamically linked");
+		default:
+			sysfatal("elf: unknown program header type %#ux", (int)ph[i].type);
+		case PT_LOAD:
+		case PT_PHDR:
+		case PT_OPENBSD_RANDOMIZE:
+			break;
+		}
+		v = gptr(ph[i].paddr, ph[i].memsz);
+		if(v == nil)
+			sysfatal("invalid address %#p (length=%#p) in elf", (void*)ph[i].paddr, (void*)ph[i].memsz);
+		if(ph[i].type == PT_OPENBSD_RANDOMIZE)
+			genrandom(v, ph[i].memsz);
+		else{
+			if(ph[i].filesz > ph[i].memsz)
+				sysfatal("elf: header entry shorter in memory than in the file (%#p < %#p)", (void*)ph[i].memsz, (void*)ph[i].filesz);
+			if(ph[i].filesz != 0)
+				epreadn(v, ph[i].filesz, ph[i].offset, "elfdata");
+			if(ph[i].filesz < ph[i].memsz)
+				memset((uchar*)v + ph[i].filesz, 0, ph[i].memsz - ph[i].filesz);
+		}
+		if(ph[i].paddr + ph[i].memsz > elfmax)
+			elfmax = ph[i].paddr + ph[i].memsz;
+	}
+}
+
+static int
+elfsymbols(void)
+{
+	ELFSHeader *s, *sy, *st;
+	char *str;
+	uchar *buf, *p;
+	int i;
+	
+	sy = nil;
+	st = nil;
+	for(s = sh; s < sh + eh.shnum; s++){
+		if(s->type == SHT_SYMTAB && s->name != nil && strcmp(s->name, ".symtab") == 0) 
+			sy = s;
+		if(s->type == SHT_STRTAB && s->name != nil && strcmp(s->name, ".strtab") == 0)
+			st = s;
+	}
+	if(sy == nil || st == nil)
+		return 0;
+	if(sy->entsize == 0 || (sy->size % sy->entsize) != 0)
+		sysfatal("symbol section: invalid headers");
+	str = emalloc(st->size);
+	epreadn(str, st->size, st->offset, "elfsymbols");
+	buf = emalloc(sy->size);
+	epreadn(buf, sy->size, sy->offset, "elfsymbols");
+	nsym = sy->size / sy->entsize;
+	sym = emalloc(sizeof(ELFSymbol) * nsym);
+	for(i = 0; i < nsym; i++){
+		p = buf + i * sy->entsize;
+		elfsymbol(sym + i, p, p + sy->entsize);
+		if(sym[i].iname < st->size)
+			sym[i].name = &str[sym[i].iname];
+	}
+	free(buf);
+	return 1;
+}
+
+static ELFSymbol *
+elfsym(char *n)
+{
+	ELFSymbol *s;
+	
+	for(s = sym; s < sym + nsym; s++)
+		if(s->name != nil && strcmp(s->name, n) == 0)
+			return s;
+	return nil;
+}
+
+static void *
+symaddr(ELFSymbol *s)
+{
+	ELFPHeader *p;
+
+	if(s == nil) return nil;
+	for(p = ph; p < ph + eh.phnum; p++)
+		if(s->addr >= p->vaddr && s->addr < p->vaddr + p->memsz)
+			return gptr(p->paddr + (s->addr - p->vaddr), s->size);
+	return nil;
+}
+
+static uchar *obsdarg, *obsdarg0, *obsdargnext;
+static int obsdarglen;
+static int obsdconsdev = 12 << 8, obsddbcons = -1, obsdbootdev;
+
+enum {
+	BOOTARG_MEMMAP,
+	BOOTARG_DISKINFO,
+	BOOTARG_APMINFO,
+	BOOTARG_CKSUMLEN,
+	BOOTARG_PCIINFO,
+	BOOTARG_CONSDEV,
+	BOOTARG_SMPINFO,
+	BOOTARG_BOOTMAC,
+	BOOTARG_DDB,
+	BOOTARG_BOOTDUID,
+	BOOTARG_BOOTSR,
+	BOOTARG_EFIINFO,
+	BOOTARG_END = -1,
+};
+
+static void
+obsdelfload(void)
+{
+	void *v, *w, *hdrfix;
+	int shentsize;
+	int saddr;
+	ELFSHeader *s;
+	uintptr off;
+	
+	saddr = elf64 ? 8 : 4;
+	elfmax = -(-elfmax & -saddr);
+	v = gptr(elfmax, eh.ehsize);
+	if(v == nil)
+space:		sysfatal("out of space for kernel");
+	epreadn(v, eh.ehsize, 0, "obsdelfload");
+	elfmax += -(-eh.ehsize & -saddr);
+	hdrfix = (uchar*)v + (elf64 ? 0x20 : 0x1c);
+	
+	shentsize = 40 + 24*elf64;
+	v = gptr(elfmax, shentsize * eh.shnum);
+	if(v == nil) goto space;
+	off = shentsize * eh.shnum;
+	elfmax += off;
+	off += -(-eh.ehsize & -saddr);
+	for(s = sh; s < sh + eh.shnum; s++)
+		if(s->type == SHT_SYMTAB || s->type == SHT_STRTAB ||
+		s->name != nil && (strcmp(s->name, ".debug_line") == 0 || strcmp(s->name, ".SUNW_ctf") == 0)){
+			w = gptr(elfmax, s->size);
+			if(w == nil) goto space;
+			epreadn(w, s->size, s->offset, "obsdelfload");
+			v = pack(v, "iizzzziizz",
+				s->iname, s->type, s->flags | SHF_ALLOC, (uintptr)0,
+				off, s->size, s->link, s->info, s->addralign, s->entsize);
+			elfmax += -(-s->size & -saddr);
+			off += -(-s->size & -saddr);
+		}else{
+			memset(v, 0, shentsize);
+			v = (uchar*)v + shentsize;
+		}
+	pack(hdrfix, "zz......sss", (uintptr)0, -(-eh.ehsize & -saddr), 0, 0, shentsize);
+}
+
+#define obsdpack(...) (obsdarg = pack(obsdarg, __VA_ARGS__))
+
+static void
+obsdstart(int type)
+{
+	obsdarg0 = obsdarg;
+	PUT32(obsdarg, 0, type);
+	PUT32(obsdarg, 8, 0); /* next */
+	obsdarg += 12;
+}
+
+static void
+obsdend(void)
+{
+	if(obsdarg == obsdarg0 + 12) obsdarg += 4;
+	PUT32(obsdarg0, 4, obsdarg - obsdarg0); /* size */
+	obsdarglen += obsdarg - obsdarg0;
+	PUT32(obsdargnext, 0, gpa(obsdarg0));
+	obsdargnext = obsdarg0 + 8;
+	obsdarg0 = nil;	
+}
+
+static void
+obsdfb(void)
+{
+	int i, s, p;
+	u32int r, g, b, a, m;
+
+	if(curmode == nil || curmode == &textmode) return;
+	p = r = g = b = a = 0;
+	for(i = 0; i < 4; i++){
+		s = curmode->chan >> 8 * i & 0xf;
+		if(s == 0) continue;
+		m = (1<<s)-1 << p;
+		p += s;
+		switch(curmode->chan >> 4 + 8 * i & 0xf){
+		case CRed: r |= m; break;
+		case CGreen: g |= m; break;
+		case CBlue: b |= m; break;
+		case CAlpha: case CIgnore: a |= m; break;
+		default: return;
+		}
+	}
+	obsdstart(BOOTARG_EFIINFO);
+	obsdpack("vvvviiiiiii", 0ULL, 0ULL, (uvlong)fbaddr, (uvlong)fbsz, curmode->h, curmode->w, curmode->w, r, g, b, a);
+	obsdend();
+}
+
+static void
+obsdargs(void)
+{
+	Region *r;
+	int t;
+
+	obsdstart(BOOTARG_MEMMAP);
+	for(r = mmap; r != nil; r = r->next){
+		t = biostype(r);
+		if(t == 0) continue;
+		obsdpack("vvi", (uvlong)r->start, (uvlong)(r->end - r->start), t);
+	}
+	obsdpack("vvi", 0ULL, 0ULL, 0);
+	obsdend();
+	obsdstart(BOOTARG_CONSDEV); obsdpack("iiii", obsdconsdev, -1, -1, 0); obsdend();
+	if(obsddbcons != -1){
+		obsdstart(BOOTARG_DDB); obsdpack("i", obsddbcons); obsdend();
+	}
+	obsdfb();
+	obsdstart(BOOTARG_END); obsdend();
+}
+
+static int
+obsdcmdline(int argc, char **argv)
+{
+	char *p;
+	char *q, *r;
+	int howto;
+	
+	howto = 0;
+	while(argc-- > 0){
+		p = *argv++;
+		if(*p == '-'){
+			while(*++p != 0)
+				switch(*p){
+				case 'a': howto |= 0x0001; break; /* RB_ASKNAME */
+				case 's': howto |= 0x0002; break; /* RB_SINGLE */
+				case 'd': howto |= 0x0040; break; /* RB_DDB */
+				case 'c': howto |= 0x0400; break; /* RB_CONFIG */
+				default: goto usage;
+				}
+			continue;
+		}
+		q = strchr(p, '=');
+		if(q == nil) goto usage;
+		*q++ = 0;
+		if(strcmp(p, "device") == 0){
+			obsdbootdev = 0;
+			switch(*q){
+			case 'w': break;
+			case 'f': obsdbootdev = 2; break;
+			case 's': obsdbootdev = 4; break;
+			case 'c': obsdbootdev = 6; break;
+			case 'r': obsdbootdev = 17; break;
+			case 'v': obsdbootdev = 14; if(*++q != 'n') goto nodev; break;
+			default: nodev: sysfatal("invalid device");
+			}
+			if(*++q != 'd') goto nodev;
+			obsdbootdev |= strtoul(++q, &r, 10) << 16;
+			if(r == q || (obsdbootdev & 0xfff00000) != 0) goto nodev;
+			if(*r < 'a' || *r > 'p') goto nodev;
+			obsdbootdev |= *r - 'a' << 8;
+			if(*++r != 0) goto nodev;
+			obsdbootdev |= 0xa0000000;
+		}else if(strcmp(p, "tty") == 0){
+			if(strcmp(q, "com0") == 0)
+				obsdconsdev = 8 << 8;
+			else if(strcmp(q, "com1") == 0)
+				obsdconsdev = 8 << 8 | 1;
+			else if(strcmp(q, "pc0") == 0)
+				obsdconsdev = 12 << 8;
+			else
+				sysfatal("tty must be one of com0, com1, pc0");
+		}else if(strcmp(p, "db_console") == 0){
+			if(strcmp(q, "on") == 0)
+				obsddbcons = 1;
+			else if(strcmp(q, "off") == 0)
+				obsddbcons = 0;
+			else
+				sysfatal("db_console must be one of on, off");
+		}else goto usage;
+	}
+	return howto;
+usage:
+	fprint(2, "openbsd cmdline usage: kernel [-asdc] [var=value ...]\nsupported vars: device tty db_console\n");
+	threadexitsall("usage");
+}
+
+static int
+obsdload(void)
+{
+	int sp;
+	int howto;
+	uchar *v;
+	
+	obsdelfload();
+	sp = 0xfffc;
+	sp -= 36;
+	v = gptr(sp, 36);
+	howto = obsdcmdline(cmdlinen, cmdlinev);
+	assert(v != nil);
+	PUT32(v, 4, howto); /* howto */
+	PUT32(v, 8, obsdbootdev); /* bootdev */
+	PUT32(v, 12, 0xa); /* bootapiver */
+	PUT32(v, 16, elfmax); /* esym */
+	PUT32(v, 20, 0); /* extmem */
+	PUT32(v, 24, 0); /* cnvmem */
+	PUT32(v, 32, 0); /* bootargv */
+	obsdarg = gptr(0x10000, 4096);
+	assert(obsdarg != nil);
+	obsdargnext = &v[32]; /* bootargv */
+	obsdargs();
+	assert(obsdarg0 == nil);
+	PUT32(v, 28, obsdarglen); /* bootargc */
+	rset(RSP, sp);
+	rset(RPC, (u32int)eh.entry & 0x0fffffff);
+	return 1;
+}
+
+static int
+tryelf(void)
+{
+	char *s, *t;
+
+	if(!elfheaders()) return 0;
+	elfdata();
+	if(!elfsymbols()) return 0;
+	s = symaddr(elfsym("ostype"));
+	if(s != nil && strcmp(s, "OpenBSD") == 0)
+		return obsdload();
+	/* from 6.9 up, bsd.rd has just these syms */
+	s = symaddr(elfsym("rd_root_image"));
+	t = symaddr(elfsym("rd_root_size"));
+	if(s != nil && t != nil)
+		return obsdload();
+	return 0;
+}
+
+static void
+linuxbootmod(char *fn, void *zp, u32int kend)
+{
+	u32int addr;
+	uintptr memend;
+	int fd;
+	vlong sz;
+	void *v;
+	int rc;
+	
+	fd = open(fn, OREAD);
+	if(fd < 0) sysfatal("linux: initrd: open: %r");
+	sz = seek(fd, 0, 2);
+	if(sz < 0) sysfatal("linux: initrd: seek: %r");
+	if(sz == 0) sysfatal("linux: empty initrd");
+	addr = GET32(zp, 0x22c);
+	memend = (1<<20) + gavail(gptr(1<<20, 0));
+	if(addr >= memend) addr = memend - 1;
+	if((addr - (sz - 1) & -4) < kend) sysfatal("linux: no room for initrd");
+	addr = addr - (sz - 1) & -4;
+	v = gptr(addr, sz);
+	if(v == nil) sysfatal("linux: initrd: gptr failed");
+	seek(fd, 0, 0);
+	rc = readn(fd, v, sz);
+	if(rc < 0) sysfatal("linux: initrd: read: %r");
+	if(rc < sz) sysfatal("linux: initrd: short read");
+	close(fd);
+	PUT32(zp, 0x218, addr);
+	PUT32(zp, 0x21C, sz);
+}
+
+static void
+linuxscreeninfo(void *zp)
+{
+	extern VgaMode *curmode, textmode;
+	extern uintptr fbaddr, fbsz;
+	uintptr extmem;
+	int i, p, s;
+	
+	extmem = gavail(gptr(1<<20, 0)) >> 10;
+	if(extmem >= 65535) extmem = 65535;
+	PUT16(zp, 0x02, extmem);
+	
+	if(curmode == nil) return;
+	if(curmode == &textmode){
+		PUT8(zp, 0x06, 3); /* mode 3 */
+		PUT8(zp, 0x07, 80); /* 80 cols */
+		PUT8(zp, 0x0e, 25); /* 25 rows */
+		PUT8(zp, 0x0f, 0x22); /* VGA */
+		PUT16(zp, 0x10, 16); /* characters are 16 pixels high */
+	}else{
+		PUT8(zp, 0x0f, 0x23); /* VESA linear framebuffer */
+		PUT16(zp, 0x12, curmode->w);
+		PUT16(zp, 0x14, curmode->h);
+		PUT16(zp, 0x16, chantodepth(curmode->chan));
+		PUT32(zp, 0x18, fbaddr);
+		PUT32(zp, 0x1C, fbsz);
+		PUT16(zp, 0x24, curmode->hbytes);
+		for(i = 0, p = 0; i < 4; i++){
+			s = curmode->chan >> 8 * i & 15;
+			if(s == 0) continue;
+			switch(curmode->chan >> 8 * i + 4 & 15){
+			case CRed: PUT16(zp, 0x26, s | p << 8); break;
+			case CGreen: PUT16(zp, 0x28, s | p << 8); break;
+			case CBlue: PUT16(zp, 0x2a, s | p << 8); break;
+			case CAlpha: case CIgnore:  PUT16(zp, 0x2c, s | p << 8); ; break;
+			}
+			p += s;
+		}
+		PUT16(zp, 0x34, 1<<0|1<<1|1<<3|1<<4|1<<5|1<<6|1<<7); /* attributes */
+	}
+}
+
+static void
+linuxgdt(void *v)
+{
+	u32int base;
+	
+	base = gpa(v);
+	rset("gdtrbase", base);
+	v = pack(v, "vvvv", 0, 0,
+		GDTBASE(0) | GDTLIM(-1) | GDTRX | GDTG | GDTP | GDT32,
+		GDTBASE(0) | GDTLIM(-1) | GDTRW | GDTG | GDTP | GDT32
+	);
+	rset("gdtrlimit", gpa(v) - base - 1);
+	rset("cs", 0x10);
+	rset("ds", 0x18);
+	rset("es", 0x18);
+	rset("ss", 0x18);
+}
+
+static void
+linuxe820(uchar *zp)
+{
+	Region *r;
+	uchar *v;
+	int t;
+	int n;
+	
+	v = zp + 0x2d0;
+	n = 1;
+	for(r = mmap; r != nil; r = r->next){
+		t = biostype(r);
+		if(t == 0) continue;
+		v = pack(v, "vvi", r->start, r->end - r->start, t);
+		n++;
+	}
+	PUT8(zp, 0x1e8, n);
+}
+
+static int
+trylinux(void)
+{
+	char buf[1024];
+	u8int loadflags;
+	u16int version;
+	uchar *zp;
+	void *v;
+	u32int ncmdline, cmdlinemax, syssize, setupsects;
+	
+	seek(fd, 0, 0);
+	if(readn(fd, buf, sizeof(buf)) < 1024) return 0;
+	if(GET16(buf, 0x1FE) != 0xAA55 || GET32(buf, 0x202) != 0x53726448) return 0;
+	version = GET16(buf, 0x206);
+	if(version < 0x206){
+		vmerror("linux: kernel too old (boot protocol version %d.%.2d, needs to be 2.06 or newer)", version >> 8, version & 0xff);
+		return 0;
+	}
+	loadflags = GET8(buf, 0x211);
+	if((loadflags & 1) == 0){
+		vmerror("linux: zImage is not supported");
+		return 0;
+	}
+	zp = gptr(0x1000, 0x1000);
+	if(zp == nil) sysfatal("linux: gptr for zeropage failed");
+	rset(RSI, 0x1000);
+	memset(zp, 0, 0x1000);
+	memmove(zp + 0x1f1, buf + 0x1f1, 0x202 + GET8(buf, 0x201) - 0x1f1);
+	setupsects = GET8(zp, 0x1F1);
+	if(setupsects == 0) setupsects = 4;
+	syssize = GET32(zp, 0x1F4);
+	cmdlinemax = GET32(zp, 0x238);
+	
+	v = gptr(1<<20, syssize << 4);
+	if(v == nil) sysfatal("linux: not enough room for kernel");
+	epreadn(v, syssize << 4, (setupsects + 1) * 512, "trylinux");
+	
+	v = gptr(0x20000, 1);
+	if(v == nil) sysfatal("linux: gptr for cmdline failed");
+	ncmdline = putcmdline(v);
+	if(ncmdline == 0)
+		*(uchar*)v = 0;
+	else
+		if(ncmdline - 1 > cmdlinemax) sysfatal("linux: cmdline too long (%d > %d)", ncmdline, cmdlinemax);
+	PUT32(zp, 0x228, 0x20000);
+	
+	switch(bootmodn){
+	case 0: break;
+	default:
+		vmerror("linux: ignoring extra boot modules (only one supported)");
+		/* wet floor */
+	case 1:
+		linuxbootmod(*bootmod, zp, (1<<20) + (syssize << 4));
+	}
+	
+	linuxscreeninfo(zp);
+	v = gptr(0x3000, 256);
+	if(v == nil) sysfatal("linux: gptr for gdt failed");
+	linuxgdt(v);
+	
+	linuxe820(zp);
+	
+	PUT16(zp, 0x1FA, 0xffff);
+	PUT8(zp, 0x210, 0xFF); /* bootloader ID */
+	PUT8(zp, 0x211, loadflags | 0x80); /* kernel can use heap */
+
+	PUT32(zp, 0x224, 0xfe00); /* kernel can use full segment */
+	rset(RPC, GET32(zp, 0x214));
+	rset(RBP, 0);
+	rset(RDI, 0);
+	rset(RBX, 0);
+	return 1;
+}
+
+
+void
+loadkernel(char *fn)
+{
+	fd = open(fn, OREAD);
+	if(fd < 0) sysfatal("open: %r");
+	if(readn(fd, hdr, sizeof(hdr)) <= 0)
+		sysfatal("readn: %r");
+	if(trymultiboot())
+		goto done;
+	if(tryelf())
+		goto done;
+	if(trylinux())
+		goto done;
+	sysfatal("%s: unknown format", fn);
+done:
+	close(fd);
+}
-- 
⑨