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#include <console/console.h>
#include <stdlib.h>
#include <stddef.h>
#include <stream/read_bytes.h>
#include <string.h>
#if CONFIG_COMPRESSED_ROM_STREAM || CONFIG_PRECOMPRESSED_ROM_STREAM
// include generic nrv2b
#include "../lib/nrv2b.c"
extern unsigned char _heap, _eheap;
#endif
#ifndef CONFIG_ROM_STREAM_START
#define CONFIG_ROM_STREAM_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_STREAM_START has to be at 0x2000000.
* but if you set CONFIG_ROM_STREAM_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_STREAM_START;
/*static const */unsigned char *rom_end = (unsigned char *)(CONFIG_ROM_STREAM_START + PAYLOAD_SIZE - 1);
/*XXXXXXXXXXXXXX */
static const unsigned char *rom;
int stream_init(void)
{
#if CONFIG_COMPRESSED_ROM_STREAM || CONFIG_PRECOMPRESSED_ROM_STREAM
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 CONFIG_COMPRESSED_ROM_STREAM || CONFIG_PRECOMPRESSED_ROM_STREAM
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)) { //linuxbios tables etc
dest = (unsigned char *) (CONFIG_LB_MEM_TOPK<<10);
}
#endif
printk_debug("Uncompressing to RAM 0x%08lx ", dest);
olen = unrv2b((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) > 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;
}
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