1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <pxe.h>
#include <realmode.h>
#include <bios.h>
#include <pnpbios.h>
#include <basemem.h>
#include <gpxe/pci.h>
#include <undi.h>
#include <undirom.h>
#include <undiload.h>
/** @file
*
* UNDI load/unload
*
*/
/** Parameter block for calling UNDI loader */
static struct s_UNDI_LOADER __bss16 ( undi_loader );
#define undi_loader __use_data16 ( undi_loader )
/** UNDI loader entry point */
static SEGOFF16_t __bss16 ( undi_loader_entry );
#define undi_loader_entry __use_data16 ( undi_loader_entry )
/**
* Call UNDI loader to create a pixie
*
* @v undi UNDI device
* @v undirom UNDI ROM
* @ret rc Return status code
*/
int undi_load ( struct undi_device *undi, struct undi_rom *undirom ) {
struct s_PXE ppxe;
unsigned int fbms_seg;
uint16_t exit;
int rc;
/* Set up START_UNDI parameters */
memset ( &undi_loader, 0, sizeof ( undi_loader ) );
undi_loader.AX = undi->pci_busdevfn;
undi_loader.BX = undi->isapnp_csn;
undi_loader.DX = undi->isapnp_read_port;
undi_loader.ES = BIOS_SEG;
undi_loader.DI = find_pnp_bios();
/* Allocate base memory for PXE stack */
undi->restore_fbms = get_fbms();
fbms_seg = ( undi->restore_fbms << 6 );
fbms_seg -= ( ( undirom->code_size + 0x0f ) >> 4 );
undi_loader.UNDI_CS = fbms_seg;
fbms_seg -= ( ( undirom->data_size + 0x0f ) >> 4 );
undi_loader.UNDI_DS = fbms_seg;
/* Debug info */
DBGC ( undi, "UNDI %p loading UNDI ROM %p to CS %04x DS %04x for ",
undi, undirom, undi_loader.UNDI_CS, undi_loader.UNDI_DS );
if ( undi->pci_busdevfn != UNDI_NO_PCI_BUSDEVFN ) {
unsigned int bus = ( undi->pci_busdevfn >> 8 );
unsigned int devfn = ( undi->pci_busdevfn & 0xff );
DBGC ( undi, "PCI %02x:%02x.%x\n",
bus, PCI_SLOT ( devfn ), PCI_FUNC ( devfn ) );
}
if ( undi->isapnp_csn != UNDI_NO_ISAPNP_CSN ) {
DBGC ( undi, "ISAPnP(%04x) CSN %04x\n",
undi->isapnp_read_port, undi->isapnp_csn );
}
/* Call loader */
undi_loader_entry = undirom->loader_entry;
__asm__ __volatile__ ( REAL_CODE ( "pushw %%ds\n\t"
"pushw %%ax\n\t"
"lcall *undi_loader_entry\n\t"
"addw $4, %%sp\n\t" )
: "=a" ( exit )
: "a" ( __from_data16 ( &undi_loader ) )
: "ebx", "ecx", "edx", "esi", "edi", "ebp" );
/* UNDI API calls may rudely change the status of A20 and not
* bother to restore it afterwards. Intel is known to be
* guilty of this.
*
* Note that we will return to this point even if A20 gets
* screwed up by the UNDI driver, because Etherboot always
* resides in an even megabyte of RAM.
*/
gateA20_set();
if ( exit != PXENV_EXIT_SUCCESS ) {
rc = -undi_loader.Status;
if ( rc == 0 ) /* Paranoia */
rc = -EIO;
DBGC ( undi, "UNDI %p loader failed: %s\n",
undi, strerror ( rc ) );
return rc;
}
/* Populate PXE device structure */
undi->pxenv = undi_loader.PXENVptr;
undi->ppxe = undi_loader.PXEptr;
copy_from_real ( &ppxe, undi->ppxe.segment, undi->ppxe.offset,
sizeof ( ppxe ) );
undi->entry = ppxe.EntryPointSP;
DBGC ( undi, "UNDI %p loaded PXENV+ %04x:%04x !PXE %04x:%04x "
"entry %04x:%04x\n", undi, undi->pxenv.segment,
undi->pxenv.offset, undi->ppxe.segment, undi->ppxe.offset,
undi->entry.segment, undi->entry.offset );
/* Update free base memory counter */
undi->fbms = ( fbms_seg >> 6 );
set_fbms ( undi->fbms );
DBGC ( undi, "UNDI %p using [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
return 0;
}
/**
* Unload a pixie
*
* @v undi UNDI device
* @ret rc Return status code
*
* Erases the PXENV+ and !PXE signatures, and frees the used base
* memory (if possible).
*/
int undi_unload ( struct undi_device *undi ) {
static uint32_t dead = 0xdeaddead;
DBGC ( undi, "UNDI %p unloading\n", undi );
/* Erase signatures */
if ( undi->pxenv.segment )
put_real ( dead, undi->pxenv.segment, undi->pxenv.offset );
if ( undi->ppxe.segment )
put_real ( dead, undi->ppxe.segment, undi->ppxe.offset );
/* Free base memory, if possible */
if ( undi->fbms == get_fbms() ) {
DBGC ( undi, "UNDI %p freeing [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
set_fbms ( undi->restore_fbms );
return 0;
} else {
DBGC ( undi, "UNDI %p leaking [%d,%d) kB of base memory\n",
undi, undi->fbms, undi->restore_fbms );
return -EBUSY;
}
}
|
