summaryrefslogtreecommitdiff
path: root/src/stream/rom_stream.c
blob: 39bae75b5b526338e79dbf6845f3789eb1958edf (plain)
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
#include <console/console.h>
#include <stdlib.h>
#include <stddef.h>
#include <stream/read_bytes.h>
#include <string.h>

/* if they set the precompressed rom stream, they better have set a type */
#if CONFIG_PRECOMPRESSED_PAYLOAD && ((!CONFIG_COMPRESSED_PAYLOAD_NRV2B) && (!CONFIG_COMPRESSED_PAYLOAD_LZMA))
#error "You set CONFIG_PRECOMPRESSED_PAYLOAD but need to set CONFIG_COMPRESSED_PAYLOAD_NRV2B or CONFIG_COMPRESSED_PAYLOAD_LZMA"
#endif

/* If they set ANY of these, then we're compressed */
#if ((CONFIG_COMPRESSED_PAYLOAD_NRV2B) || (CONFIG_COMPRESSED_PAYLOAD_LZMA))
#define UNCOMPRESSER 1
extern unsigned char _heap, _eheap;
#endif

#if (CONFIG_COMPRESSED_PAYLOAD_NRV2B) 
#define HAVE_UNCOMPRESSER 1
// include generic nrv2b
#include "../lib/nrv2b.c"
#endif

#if (CONFIG_COMPRESSED_PAYLOAD_LZMA)
#if HAVE_UNCOMPRESSER
#error "You're defining more than one compression type, which is not allowed (of course)"
#endif
#define HAVE_UNCOMPRESSER 1
// include generic nrv2b
#include "../lib/lzma.c"
#endif

#ifndef CONFIG_ROM_PAYLOAD_START
#define CONFIG_ROM_PAYLOAD_START 0xffff0000UL
#endif

/* well, this is a mess, and it will get fixed, but not right away.
 * until we stop using 'ld' for building the rom image, that is.
 * problem is, that on the sc520, ROM_PAYLOAD_START has to be at 0x2000000.
 * but if you set CONFIG_ROM_PAYLOAD_START to that, then ld will try to
 * build a giant image: 0x0-0x2000000, i.e. almost 4 GB.
 * so make this non-static, non-const for now.
 */

/*XXXXXXXXXXXXXX */
/*static const */unsigned char *rom_start = (unsigned char *)CONFIG_ROM_PAYLOAD_START;
/*static const */unsigned char *rom_end   = (unsigned char *)(CONFIG_ROM_PAYLOAD_START + PAYLOAD_SIZE - 1);
/*XXXXXXXXXXXXXX */

static const unsigned char *rom;

#if UNCOMPRESSER
unsigned long 
uncompress(uint8_t * rom_start, uint8_t *dest )
{
#if (CONFIG_COMPRESSED_PAYLOAD_NRV2B) 
	unsigned long ilen; // used compressed stream length
	return unrv2b(rom_start, dest, &ilen);
#endif
#if (CONFIG_COMPRESSED_PAYLOAD_LZMA)
	return ulzma(rom_start, dest);
#endif
}
#endif
int stream_init(void)
{
#if (UNCOMPRESSER)
        unsigned char *dest;
        unsigned long olen;
#endif

	printk_debug("rom_stream: 0x%08lx - 0x%08lx\n",
		(unsigned long)rom_start,
		(unsigned long)rom_end);

#if (UNCOMPRESSER) 

        dest = &_eheap; /* need a good address on RAM */

#if _RAMBASE<0x00100000
	olen = *(unsigned int *)dest;
#if (CONFIG_CONSOLE_VGA==1) || (CONFIG_PCI_ROM_RUN == 1)
	if((dest < 0xa0000) && ((dest+olen)>0xa0000)) {
		dest = (CONFIG_LB_MEM_TOPK<<10);
	}
#endif
        if((dest < (unsigned char *) 0xf0000) && ((dest+olen)> (unsigned char *)0xf0000)) { // coreboot tables etc
	  dest = (unsigned char *) (CONFIG_LB_MEM_TOPK<<10);
        }
#endif

	/* ALL of those settings are too smart and also unsafe. Set the dest to 16 MB: 
	 * known to be safe for LB for now, and mostly safe for all elf images we have tried. 
	 * long term, this has got to be fixed. 
	 */
	dest  = (unsigned char *) (16 * 1024 * 1024);
        printk_debug("Uncompressing to RAM 0x%08lx ", dest);
        olen = uncompress((uint8_t *) rom_start, (uint8_t *)dest );
	printk_debug(" olen = 0x%08lx done.\n", olen);
	rom_end = dest + olen - 1;
	rom = dest;
#else
        rom = rom_start;
#endif

	return 0;
}


void stream_fini(void)
{
	return;
}

byte_offset_t stream_skip(byte_offset_t count)
{
	byte_offset_t bytes;
	bytes = count;
	if ((rom + bytes - 1) > rom_end) {
		printk_warning("%6d:%s() - overflowed source buffer\n",
			__LINE__, __FUNCTION__);
		bytes = 0;
		if (rom <= rom_end) {
			bytes = (rom_end - rom) + 1;
		}
	}
	rom += bytes;
	return bytes;
}

byte_offset_t stream_read(void *vdest, byte_offset_t count)
{
	unsigned char *dest = vdest;
	const unsigned char *src = rom;
	byte_offset_t bytes;

	bytes = stream_skip(count);
	memcpy(dest, src, bytes);
	return bytes;
}