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
172
|
// Main VGA bios initialization
//
// Copyright (C) 2009-2013 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2001-2008 the LGPL VGABios developers Team
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // SET_BDA
#include "bregs.h" // struct bregs
#include "hw/pci.h" // pci_config_readw
#include "hw/pci_regs.h" // PCI_VENDOR_ID
#include "hw/serialio.h" // serial_debug_preinit
#include "output.h" // dprintf
#include "std/optionrom.h" // struct pci_data
#include "std/pmm.h" // struct pmmheader
#include "string.h" // checksum_far
#include "util.h" // VERSION
#include "vgabios.h" // struct VideoSavePointer_s
#include "vgahw.h" // vgahw_setup
// Standard Video Save Pointer Table
struct VideoSavePointer_s {
struct segoff_s videoparam;
struct segoff_s paramdynamicsave;
struct segoff_s textcharset;
struct segoff_s graphcharset;
struct segoff_s secsavepointer;
u8 reserved[8];
} PACKED;
struct VideoSavePointer_s video_save_pointer_table VAR16;
struct VideoParam_s video_param_table[29] VAR16;
/****************************************************************
* PCI Data
****************************************************************/
struct pci_data rom_pci_data VAR16 VISIBLE16 = {
.signature = PCI_ROM_SIGNATURE,
.vendor = CONFIG_VGA_VID,
.device = CONFIG_VGA_DID,
.dlen = 0x18,
.class_hi = 0x300,
.irevision = 1,
.type = PCIROM_CODETYPE_X86,
.indicator = 0x80,
};
/****************************************************************
* PMM call and extra stack setup
****************************************************************/
u16 ExtraStackSeg VAR16 VISIBLE16;
static void
allocate_extra_stack(void)
{
if (!CONFIG_VGA_ALLOCATE_EXTRA_STACK)
return;
u32 pmmscan;
for (pmmscan=0; pmmscan < BUILD_BIOS_SIZE; pmmscan+=16) {
struct pmmheader *pmm = (void*)pmmscan;
if (GET_FARVAR(SEG_BIOS, pmm->signature) != PMM_SIGNATURE)
continue;
if (checksum_far(SEG_BIOS, pmm, GET_FARVAR(SEG_BIOS, pmm->length)))
continue;
struct segoff_s entry = GET_FARVAR(SEG_BIOS, pmm->entry);
dprintf(1, "Attempting to allocate VGA stack via pmm call to %04x:%04x\n"
, entry.seg, entry.offset);
u16 res1, res2;
asm volatile(
"pushl %0\n"
"pushw $(8|1)\n" // Permanent low memory request
"pushl $0xffffffff\n" // Anonymous handle
"pushl $" __stringify(CONFIG_VGA_EXTRA_STACK_SIZE/16) "\n"
"pushw $0x00\n" // PMM allocation request
"lcallw *12(%%esp)\n"
"addl $16, %%esp\n"
"cli\n"
"cld\n"
: "+r" (entry.segoff), "=a" (res1), "=d" (res2) : : "cc", "memory");
u32 res = res1 | (res2 << 16);
if (!res || res == PMM_FUNCTION_NOT_SUPPORTED)
return;
dprintf(1, "VGA stack allocated at %x\n", res);
SET_VGA(ExtraStackSeg, res >> 4);
extern void entry_10_extrastack(void);
SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10_extrastack));
return;
}
}
/****************************************************************
* VGA post
****************************************************************/
static void
init_bios_area(void)
{
// init detected hardware BIOS Area
// set 80x25 color (not clear from RBIL but usual)
set_equipment_flags(0x30, 0x20);
// the default char height
SET_BDA(char_height, 0x10);
// Clear the screen
SET_BDA(video_ctl, 0x60);
// Set the basic screen we have
SET_BDA(video_switches, 0xf9);
// Set the basic modeset options
SET_BDA(modeset_ctl, 0x51);
// Set the default MSR
SET_BDA(video_msr, 0x09);
}
int VgaBDF VAR16 = -1;
int HaveRunInit VAR16;
void VISIBLE16
vga_post(struct bregs *regs)
{
serial_debug_preinit();
dprintf(1, "Start SeaVGABIOS (version %s)\n", VERSION);
debug_enter(regs, DEBUG_VGA_POST);
if (CONFIG_VGA_PCI && !GET_GLOBAL(HaveRunInit)) {
u16 bdf = regs->ax;
if ((pci_config_readw(bdf, PCI_VENDOR_ID)
== GET_GLOBAL(rom_pci_data.vendor))
&& (pci_config_readw(bdf, PCI_DEVICE_ID)
== GET_GLOBAL(rom_pci_data.device)))
SET_VGA(VgaBDF, bdf);
}
int ret = vgahw_setup();
if (ret) {
dprintf(1, "Failed to initialize VGA hardware. Exiting.\n");
return;
}
if (GET_GLOBAL(HaveRunInit))
return;
init_bios_area();
SET_VGA(video_save_pointer_table.videoparam
, SEGOFF(get_global_seg(), (u32)video_param_table));
if (CONFIG_VGA_STDVGA_PORTS)
stdvga_build_video_param();
extern void entry_10(void);
SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10));
allocate_extra_stack();
SET_VGA(HaveRunInit, 1);
// Fixup checksum
extern u8 _rom_header_size, _rom_header_checksum;
SET_VGA(_rom_header_checksum, 0);
u8 sum = -checksum_far(get_global_seg(), 0,
GET_GLOBAL(_rom_header_size) * 512);
SET_VGA(_rom_header_checksum, sum);
}
|
