mirror of https://github.com/ipxe/ipxe.git
Moved NBI support to nbi.c, modified to work with new load mechanism
Michael Brown
parent
9c832a6a69
commit
205a7ad5e0
|
|
@ -1,201 +0,0 @@
|
|||
#include "realmode.h"
|
||||
|
||||
struct segheader
|
||||
{
|
||||
unsigned char length;
|
||||
unsigned char vendortag;
|
||||
unsigned char reserved;
|
||||
unsigned char flags;
|
||||
unsigned long loadaddr;
|
||||
unsigned long imglength;
|
||||
unsigned long memlength;
|
||||
};
|
||||
|
||||
struct imgheader
|
||||
{
|
||||
unsigned long magic;
|
||||
unsigned long length; /* and flags */
|
||||
union
|
||||
{
|
||||
segoff_t segoff;
|
||||
unsigned long location;
|
||||
} u;
|
||||
unsigned long execaddr;
|
||||
};
|
||||
|
||||
/* Keep all context about loaded image in one place */
|
||||
static struct tagged_context
|
||||
{
|
||||
struct imgheader img; /* copy of header */
|
||||
unsigned long linlocation; /* addr of header */
|
||||
unsigned long last0, last1; /* of prev segment */
|
||||
unsigned long segaddr, seglen; /* of current segment */
|
||||
unsigned char segflags;
|
||||
unsigned char first;
|
||||
unsigned long curaddr;
|
||||
} tctx;
|
||||
|
||||
#define TAGGED_PROGRAM_RETURNS (tctx.img.length & 0x00000100) /* bit 8 */
|
||||
#define LINEAR_EXEC_ADDR (tctx.img.length & 0x80000000) /* bit 31 */
|
||||
|
||||
static sector_t tagged_download(unsigned char *data, unsigned int len, int eof);
|
||||
void xstart16 (unsigned long execaddr, segoff_t location,
|
||||
struct bootpd_t *bootp);
|
||||
|
||||
static inline os_download_t tagged_probe(unsigned char *data, unsigned int len)
|
||||
{
|
||||
struct segheader *sh;
|
||||
unsigned long loc;
|
||||
if (*((uint32_t *)data) != 0x1B031336L) {
|
||||
return 0;
|
||||
}
|
||||
printf("(NBI)");
|
||||
/* If we don't have enough data give up */
|
||||
if (len < 512)
|
||||
return dead_download;
|
||||
/* Zero all context info */
|
||||
memset(&tctx, 0, sizeof(tctx));
|
||||
/* Copy first 4 longwords */
|
||||
memcpy(&tctx.img, data, sizeof(tctx.img));
|
||||
/* Memory location where we are supposed to save it */
|
||||
tctx.segaddr = tctx.linlocation =
|
||||
((tctx.img.u.segoff.segment) << 4) + tctx.img.u.segoff.offset;
|
||||
if (!prep_segment(tctx.segaddr, tctx.segaddr + 512, tctx.segaddr + 512,
|
||||
0, 512)) {
|
||||
return dead_download;
|
||||
}
|
||||
/* Now verify the segments we are about to load */
|
||||
loc = 512;
|
||||
for(sh = (struct segheader *)(data
|
||||
+ ((tctx.img.length & 0x0F) << 2)
|
||||
+ ((tctx.img.length & 0xF0) >> 2) );
|
||||
(sh->length > 0) && ((unsigned char *)sh < data + 512);
|
||||
sh = (struct segheader *)((unsigned char *)sh
|
||||
+ ((sh->length & 0x0f) << 2) + ((sh->length & 0xf0) >> 2)) ) {
|
||||
if (!prep_segment(
|
||||
sh->loadaddr,
|
||||
sh->loadaddr + sh->imglength,
|
||||
sh->loadaddr + sh->imglength,
|
||||
loc, loc + sh->imglength)) {
|
||||
return dead_download;
|
||||
}
|
||||
loc = loc + sh->imglength;
|
||||
if (sh->flags & 0x04)
|
||||
break;
|
||||
}
|
||||
if (!(sh->flags & 0x04))
|
||||
return dead_download;
|
||||
/* Grab a copy */
|
||||
memcpy(phys_to_virt(tctx.segaddr), data, 512);
|
||||
/* Advance to first segment descriptor */
|
||||
tctx.segaddr += ((tctx.img.length & 0x0F) << 2)
|
||||
+ ((tctx.img.length & 0xF0) >> 2);
|
||||
/* Remember to skip the first 512 data bytes */
|
||||
tctx.first = 1;
|
||||
|
||||
return tagged_download;
|
||||
|
||||
}
|
||||
static sector_t tagged_download(unsigned char *data, unsigned int len, int eof)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (tctx.first) {
|
||||
tctx.first = 0;
|
||||
if (len > 512) {
|
||||
len -= 512;
|
||||
data += 512;
|
||||
/* and fall through to deal with rest of block */
|
||||
} else
|
||||
return 0;
|
||||
}
|
||||
for (;;) {
|
||||
if (len == 0) /* Detect truncated files */
|
||||
eof = 0;
|
||||
while (tctx.seglen == 0) {
|
||||
struct segheader sh;
|
||||
if (tctx.segflags & 0x04) {
|
||||
done(1);
|
||||
if (LINEAR_EXEC_ADDR) {
|
||||
int result;
|
||||
/* no gateA20_unset for PM call */
|
||||
result = xstart32(tctx.img.execaddr,
|
||||
virt_to_phys(&loaderinfo),
|
||||
tctx.linlocation,
|
||||
virt_to_phys(BOOTP_DATA_ADDR));
|
||||
printf("Secondary program returned %d\n",
|
||||
result);
|
||||
if (!TAGGED_PROGRAM_RETURNS) {
|
||||
/* We shouldn't have returned */
|
||||
result = -2;
|
||||
}
|
||||
if (result == 0)
|
||||
result = -2;
|
||||
longjmp(restart_etherboot, result);
|
||||
|
||||
} else {
|
||||
gateA20_unset();
|
||||
xstart16(tctx.img.execaddr,
|
||||
tctx.img.u.segoff,
|
||||
BOOTP_DATA_ADDR);
|
||||
longjmp(restart_etherboot, -2);
|
||||
}
|
||||
}
|
||||
sh = *((struct segheader *)phys_to_virt(tctx.segaddr));
|
||||
tctx.seglen = sh.imglength;
|
||||
if ((tctx.segflags = sh.flags & 0x03) == 0)
|
||||
tctx.curaddr = sh.loadaddr;
|
||||
else if (tctx.segflags == 0x01)
|
||||
tctx.curaddr = tctx.last1 + sh.loadaddr;
|
||||
else if (tctx.segflags == 0x02)
|
||||
tctx.curaddr = (Address)(meminfo.memsize * 1024L
|
||||
+ 0x100000L)
|
||||
- sh.loadaddr;
|
||||
else
|
||||
tctx.curaddr = tctx.last0 - sh.loadaddr;
|
||||
tctx.last1 = (tctx.last0 = tctx.curaddr) + sh.memlength;
|
||||
tctx.segflags = sh.flags;
|
||||
tctx.segaddr += ((sh.length & 0x0F) << 2)
|
||||
+ ((sh.length & 0xF0) >> 2);
|
||||
/* Avoid lock-up */
|
||||
if ( sh.length == 0 ) longjmp(restart_etherboot, -2);
|
||||
}
|
||||
if ((len <= 0) && !eof)
|
||||
break;
|
||||
i = (tctx.seglen > len) ? len : tctx.seglen;
|
||||
memcpy(phys_to_virt(tctx.curaddr), data, i);
|
||||
tctx.seglen -= i;
|
||||
tctx.curaddr += i;
|
||||
len -= i;
|
||||
data += i;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void xstart16 (unsigned long execaddr, segoff_t location,
|
||||
struct bootpd_t *bootp) {
|
||||
uint16_t basemem_bootp;
|
||||
int discard_D, discard_S, discard_b;
|
||||
|
||||
/* AFAICT, execaddr is actually already a segment:offset */
|
||||
basemem_bootp = BASEMEM_PARAMETER_INIT ( *bootp );
|
||||
REAL_EXEC ( rm_xstart16,
|
||||
"pushw %%ds\n\t" /* far pointer to bootp data copy */
|
||||
"pushw %%bx\n\t"
|
||||
"pushl %%esi\n\t" /* location */
|
||||
"pushw %%cs\n\t" /* lcall execaddr */
|
||||
"call 1f\n\t"
|
||||
"jmp 2f\n\t"
|
||||
"\n1:\n\t"
|
||||
"pushl %%edi\n\t"
|
||||
"lret\n\t"
|
||||
"\n2:\n\t"
|
||||
"addw $8,%%sp\n\t", /* pop location and bootp ptr */
|
||||
3,
|
||||
OUT_CONSTRAINTS ( "=D" ( discard_D ), "=S" ( discard_S ),
|
||||
"=b" ( discard_b ) ),
|
||||
IN_CONSTRAINTS ( "D" ( execaddr ), "S" ( location ),
|
||||
"b" ( basemem_bootp ) ),
|
||||
CLOBBER ( "eax", "ecx", "edx", "ebp" ) );
|
||||
BASEMEM_PARAMETER_DONE ( *bootp );
|
||||
}
|
||||
|
|
@ -0,0 +1,306 @@
|
|||
#include "image.h"
|
||||
#include "memsizes.h"
|
||||
#include "realmode.h"
|
||||
#include "gateA20.h"
|
||||
#include "osloader.h"
|
||||
#include "etherboot.h"
|
||||
|
||||
/* An NBI image header */
|
||||
struct imgheader {
|
||||
unsigned long magic;
|
||||
union {
|
||||
unsigned char length;
|
||||
unsigned long flags;
|
||||
};
|
||||
segoff_t location;
|
||||
union {
|
||||
segoff_t segoff;
|
||||
unsigned long linear;
|
||||
} execaddr;
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/* NBI magic number */
|
||||
#define NBI_MAGIC 0x1B031336UL
|
||||
|
||||
/* Interpretation of the "length" fields */
|
||||
#define NBI_NONVENDOR_LENGTH(len) ( ( (len) & 0x0f ) << 2 )
|
||||
#define NBI_VENDOR_LENGTH(len) ( ( (len) & 0xf0 ) >> 2 )
|
||||
#define NBI_LENGTH(len) ( NBI_NONVENDOR_LENGTH(len) + NBI_VENDOR_LENGTH(len) )
|
||||
|
||||
/* Interpretation of the "flags" fields */
|
||||
#define NBI_PROGRAM_RETURNS(flags) ( (flags) & ( 1 << 8 ) )
|
||||
#define NBI_LINEAR_EXEC_ADDR(flags) ( (flags) & ( 1 << 31 ) )
|
||||
|
||||
/* NBI header length */
|
||||
#define NBI_HEADER_LENGTH 512
|
||||
|
||||
/* An NBI segment header */
|
||||
struct segheader {
|
||||
unsigned char length;
|
||||
unsigned char vendortag;
|
||||
unsigned char reserved;
|
||||
unsigned char flags;
|
||||
unsigned long loadaddr;
|
||||
unsigned long imglength;
|
||||
unsigned long memlength;
|
||||
};
|
||||
|
||||
/* Interpretation of the "flags" fields */
|
||||
#define NBI_LOADADDR_FLAGS(flags) ( (flags) & 0x03 )
|
||||
#define NBI_LOADADDR_ABS 0x00
|
||||
#define NBI_LOADADDR_AFTER 0x01
|
||||
#define NBI_LOADADDR_END 0x02
|
||||
#define NBI_LOADADDR_BEFORE 0x03
|
||||
#define NBI_LAST_SEGHEADER(flags) ( (flags) & ( 1 << 2 ) )
|
||||
|
||||
/* Info passed to NBI image */
|
||||
static struct ebinfo loaderinfo = {
|
||||
VERSION_MAJOR, VERSION_MINOR,
|
||||
0
|
||||
};
|
||||
|
||||
/*
|
||||
* Determine whether or not this is a valid NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_probe ( physaddr_t start, off_t len, void **context ) {
|
||||
static struct imgheader imgheader;
|
||||
|
||||
if ( (unsigned)len < sizeof ( imgheader ) ) {
|
||||
DBG ( "NBI image too small\n" );
|
||||
return 0;
|
||||
}
|
||||
|
||||
copy_from_phys ( &imgheader, start, sizeof ( imgheader ) );
|
||||
|
||||
if ( imgheader.magic != NBI_MAGIC )
|
||||
return 0;
|
||||
|
||||
/* Record image context */
|
||||
DBG ( "NBI found valid image\n" );
|
||||
*context = &imgheader;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Prepare a segment for an NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_prepare_segment ( physaddr_t dest, off_t imglen, off_t memlen,
|
||||
physaddr_t src __unused ) {
|
||||
DBG ( "NBI preparing segment [%x,%x) (imglen %d memlen %d)\n",
|
||||
dest, dest + memlen, imglen, memlen );
|
||||
return prep_segment ( dest, dest + imglen, dest + memlen );
|
||||
}
|
||||
|
||||
/*
|
||||
* Load a segment for an NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_load_segment ( physaddr_t dest, off_t imglen,
|
||||
off_t memlen __unused, physaddr_t src ) {
|
||||
DBG ( "NBI loading segment [%x,%x)\n", dest, dest + imglen );
|
||||
copy_phys_to_phys ( dest, src, imglen );
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Process segments of an NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_process_segments ( physaddr_t start, off_t len,
|
||||
struct imgheader *imgheader,
|
||||
int ( * process ) ( physaddr_t dest,
|
||||
off_t imglen,
|
||||
off_t memlen,
|
||||
physaddr_t src ) ) {
|
||||
struct segheader sh;
|
||||
off_t offset = 0;
|
||||
off_t sh_off;
|
||||
physaddr_t dest;
|
||||
off_t dest_imglen, dest_memlen;
|
||||
|
||||
/* Copy header to target location */
|
||||
dest = ( ( imgheader->location.segment << 4 ) +
|
||||
imgheader->location.offset );
|
||||
dest_imglen = dest_memlen = NBI_HEADER_LENGTH;
|
||||
if ( ! process ( dest, dest_imglen, dest_memlen, start + offset ) )
|
||||
return 0;
|
||||
offset += dest_imglen;
|
||||
|
||||
/* Process segments in turn */
|
||||
sh_off = NBI_LENGTH ( imgheader->length );
|
||||
do {
|
||||
/* Read segment header */
|
||||
copy_from_phys ( &sh, start + sh_off, sizeof ( sh ) );
|
||||
if ( sh.length == 0 ) {
|
||||
/* Avoid infinite loop? */
|
||||
DBG ( "NBI invalid segheader length 0\n" );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Calculate segment load address */
|
||||
switch ( NBI_LOADADDR_FLAGS ( sh.flags ) ) {
|
||||
case NBI_LOADADDR_ABS:
|
||||
dest = sh.loadaddr;
|
||||
break;
|
||||
case NBI_LOADADDR_AFTER:
|
||||
dest = dest + dest_memlen + sh.loadaddr;
|
||||
break;
|
||||
case NBI_LOADADDR_BEFORE:
|
||||
dest = dest - sh.loadaddr;
|
||||
break;
|
||||
case NBI_LOADADDR_END:
|
||||
/* Not correct according to the spec, but
|
||||
* maintains backwards compatibility with
|
||||
* previous versions of Etherboot.
|
||||
*/
|
||||
dest = ( meminfo.memsize * 1024 + 0x100000UL )
|
||||
- sh.loadaddr;
|
||||
break;
|
||||
default:
|
||||
DBG ( "NBI can't count up to three\n" );
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Process this segment */
|
||||
dest_imglen = sh.imglength;
|
||||
dest_memlen = sh.memlength;
|
||||
if ( ! process ( dest, dest_imglen, dest_memlen,
|
||||
start + offset ) )
|
||||
return 0;
|
||||
offset += dest_imglen;
|
||||
|
||||
/* Next segheader */
|
||||
sh_off += NBI_LENGTH ( sh.length );
|
||||
if ( sh_off >= NBI_HEADER_LENGTH ) {
|
||||
DBG ( "NBI header overflow\n" );
|
||||
return 0;
|
||||
}
|
||||
|
||||
} while ( ! NBI_LAST_SEGHEADER ( sh.flags ) );
|
||||
|
||||
if ( offset != len ) {
|
||||
DBG ( "NBI length mismatch (file %d, metadata %d)\n",
|
||||
len, offset );
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Load an NBI image into memory
|
||||
*
|
||||
*/
|
||||
static int nbi_load ( physaddr_t start, off_t len, void *context ) {
|
||||
struct imgheader *imgheader = context;
|
||||
|
||||
/* If we don't have enough data give up */
|
||||
if ( len < NBI_HEADER_LENGTH )
|
||||
return 0;
|
||||
|
||||
DBG ( "NBI placing header at %hx:%hx\n",
|
||||
imgheader->location.segment, imgheader->location.offset );
|
||||
|
||||
/* NBI files can have overlaps between segments; the bss of
|
||||
* one segment may overlap the initialised data of another. I
|
||||
* assume this is a design flaw, but there are images out
|
||||
* there that we need to work with. We therefore do two
|
||||
* passes: first to initialise the segments, then to copy the
|
||||
* data. This avoids zeroing out already-copied data.
|
||||
*/
|
||||
if ( ! nbi_process_segments ( start, len, imgheader,
|
||||
nbi_prepare_segment ) )
|
||||
return 0;
|
||||
if ( ! nbi_process_segments ( start, len, imgheader,
|
||||
nbi_load_segment ) )
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Boot a 16-bit NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_boot16 ( struct imgheader *imgheader ) {
|
||||
uint16_t basemem_bootp;
|
||||
int discard_D, discard_S, discard_b;
|
||||
|
||||
DBG ( "NBI executing 16-bit image at %hx:%hx\n",
|
||||
imgheader->execaddr.segoff.segment,
|
||||
imgheader->execaddr.segoff.offset );
|
||||
|
||||
gateA20_unset();
|
||||
|
||||
basemem_bootp = BASEMEM_PARAMETER_INIT ( bootp_data );
|
||||
REAL_EXEC ( rm_xstart16,
|
||||
"pushw %%ds\n\t" /* far pointer to bootp data copy */
|
||||
"pushw %%bx\n\t"
|
||||
"pushl %%esi\n\t" /* location */
|
||||
"pushw %%cs\n\t" /* lcall execaddr */
|
||||
"call 1f\n\t"
|
||||
"jmp 2f\n\t"
|
||||
"\n1:\n\t"
|
||||
"pushl %%edi\n\t"
|
||||
"lret\n\t"
|
||||
"\n2:\n\t"
|
||||
"addw $8,%%sp\n\t", /* pop location and bootp ptr */
|
||||
3,
|
||||
OUT_CONSTRAINTS ( "=D" ( discard_D ), "=S" ( discard_S ),
|
||||
"=b" ( discard_b ) ),
|
||||
IN_CONSTRAINTS ( "D" ( imgheader->execaddr.segoff ),
|
||||
"S" ( imgheader->location ),
|
||||
"b" ( basemem_bootp ) ),
|
||||
CLOBBER ( "eax", "ecx", "edx", "ebp" ) );
|
||||
BASEMEM_PARAMETER_DONE ( bootp_data );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Boot a 32-bit NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_boot32 ( struct imgheader *imgheader ) {
|
||||
int rc = 0;
|
||||
|
||||
DBG ( "NBI executing 32-bit image at %x\n",
|
||||
imgheader->execaddr.linear );
|
||||
|
||||
/* no gateA20_unset for PM call */
|
||||
rc = xstart32 ( imgheader->execaddr.linear,
|
||||
virt_to_phys ( &loaderinfo ),
|
||||
( ( imgheader->location.segment << 4 ) +
|
||||
imgheader->location.offset ),
|
||||
virt_to_phys ( &bootp_data ) );
|
||||
printf ( "Secondary program returned %d\n", rc );
|
||||
if ( ! NBI_PROGRAM_RETURNS ( imgheader->flags ) ) {
|
||||
/* We shouldn't have returned */
|
||||
rc = 0;
|
||||
}
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Boot a loaded NBI image
|
||||
*
|
||||
*/
|
||||
static int nbi_boot ( void *context ) {
|
||||
struct imgheader *imgheader = context;
|
||||
|
||||
if ( NBI_LINEAR_EXEC_ADDR ( imgheader->flags ) ) {
|
||||
return nbi_boot32 ( imgheader );
|
||||
} else {
|
||||
return nbi_boot16 ( imgheader );
|
||||
}
|
||||
}
|
||||
|
||||
static struct image nbi_image __image = {
|
||||
.name = "NBI",
|
||||
.probe = nbi_probe,
|
||||
.load = nbi_load,
|
||||
.boot = nbi_boot,
|
||||
};
|
||||
Loading…
Reference in New Issue