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
|
/*
* bootstub 32 bit entry setting routings
* Copyright (C) 2008, Alek Du <alek.du@intel.com> Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "types.h"
#include "bootstub.h"
#include "bootparam.h"
#include "spi-uart.h"
#include "sfi.h"
#define bs_printk(x) { if (! *(int *)SPI_UART_SUPPRESSION) bs_spi_printk(x);}
struct gdt_ptr {
u16 len;
u32 ptr;
} __attribute__((packed));
static void setup_gdt(void)
{
static const u64 boot_gdt[] __attribute__((aligned(16))) = {
/* CS: code, read/execute, 4 GB, base 0 */
[GDT_ENTRY_BOOT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff),
/* DS: data, read/write, 4 GB, base 0 */
[GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff),
};
static struct gdt_ptr gdt;
gdt.len = sizeof(boot_gdt)-1;
gdt.ptr = (u32)&boot_gdt;
asm volatile("lgdtl %0" : : "m" (gdt));
}
static void setup_idt(void)
{
static const struct gdt_ptr null_idt = {0, 0};
asm volatile("lidtl %0" : : "m" (null_idt));
}
static void *memcpy(void *dest, const void *src, size_t count)
{
char *tmp = dest;
const char *s = src;
size_t _count = count / 4;
while (_count--) {
*(long *)tmp = *(long *)s;
tmp += 4;
s += 4;
}
count %= 4;
while (count--)
*tmp++ = *s++;
return dest;
}
static void *memset(void *s, unsigned char c, size_t count)
{
char *xs = s;
size_t _count = count / 4;
unsigned long _c = c << 24 | c << 16 | c << 8 | c;
while (_count--) {
*(long *)xs = _c;
xs += 4;
}
count %= 4;
while (count--)
*xs++ = c;
return s;
}
static size_t strnlen(const char *s, size_t maxlen)
{
const char *es = s;
while (*es && maxlen) {
es++;
maxlen--;
}
return (es - s);
}
static void setup_boot_params(struct boot_params *bp, struct setup_header *sh)
{
memset(bp, 0, sizeof (struct boot_params));
bp->screen_info.orig_video_mode = 0;
bp->screen_info.orig_video_lines = 0;
bp->screen_info.orig_video_cols = 0;
bp->alt_mem_k = 128*1024; // hard coded 128M mem here, since SFI will override it
memcpy(&bp->hdr, sh, sizeof (struct setup_header));
bp->hdr.cmd_line_ptr = CMDLINE_OFFSET;
bp->hdr.cmdline_size = strnlen((const char *)CMDLINE_OFFSET,256);
bp->hdr.type_of_loader = 0xff; //bootstub is unknown bootloader for kernel :)
bp->hdr.ramdisk_size = *(u32 *)INITRD_SIZE_OFFSET;
bp->hdr.ramdisk_image = (bp->alt_mem_k*1024 - bp->hdr.ramdisk_size) & 0xFFFFF000;
bp->hdr.hardware_subarch = X86_SUBARCH_MRST;
memcpy((u8*)bp->hdr.ramdisk_image, (u8 *)BZIMAGE_OFFSET + *(u32 *)BZIMAGE_SIZE_OFFSET, bp->hdr.ramdisk_size);
sfi_setup_e820(bp);
}
static int get_32bit_entry(unsigned char *ptr)
{
while (1){
if (*(u32 *)ptr == SETUP_SIGNATURE && *(u32 *)(ptr+4) == 0)
break;
ptr++;
}
ptr+=4;
return (((unsigned int)ptr+511)/512)*512;
}
int bootstub(void)
{
setup_idt();
setup_gdt();
bs_printk("Bootstub Version: 0.6 ...\n");
setup_boot_params((struct boot_params *)BOOT_PARAMS_OFFSET,
(struct setup_header *)SETUP_HEADER_OFFSET);
bs_printk("Jump to kernel 32bit entry ...\n");
return get_32bit_entry((unsigned char *)BZIMAGE_OFFSET);
}
|
