/*
- * LZMA compressed kernel decompressor for bcm947xx boards
+ * $Id$
+ *
+ * LZMA compressed kernel decompressor for ADM5120 boards
*
* Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
+ * Copyright (C) 2007 OpenWrt.org
*
* 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
* 24-Mar-2007 Gabor Juhos
* pass original values of the a0,a1,a2,a3 registers to the kernel
*
+ * 19-May-2007 Gabor Juhos
+ * endiannes related cleanups
+ * add support for decompressing an embedded kernel
+ *
*/
+#include <stddef.h>
+
+#include "config.h"
+#include "printf.h"
#include "LzmaDecode.h"
-#define BCM4710_FLASH 0x1fc00000 /* Flash */
+#define ADM5120_FLASH_START 0x1fc00000 /* Flash start */
+#define ADM5120_FLASH_END 0x1fe00000 /* Flash end */
#define KSEG0 0x80000000
#define KSEG1 0xa0000000
"cache %1, (%0);\n" \
".set mips0;\n" \
".set reorder\n" \
- : \
+ : \
: "r" (base), \
"i" (op));
+#ifdef LZMA_DEBUG
+# define DBG(f, a...) printf(f, ## a)
+#else
+# define DBG(f, a...) do {} while (0)
+#endif
+
static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
{
unsigned long start = KSEG0;
}
#define TRX_MAGIC 0x30524448 /* "HDR0" */
+#define TRX_ALIGN 0x1000
struct trx_header {
unsigned int magic; /* "HDR0" */
unsigned int offsets[3]; /* Offsets of partitions from start of header */
};
+struct env_var {
+ char *name;
+ char *value;
+};
+
/* beyound the image end, size not known in advance */
extern unsigned char workspace[];
-
-unsigned int offset;
-unsigned char *data;
+extern void board_init(void);
typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
unsigned long reg_a2, unsigned long reg_a3);
-/* flash access should be aligned, so wrapper is used */
-/* read byte from the flash, all accesses are 32-bit aligned */
-static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
+static int decompress_data(unsigned char *buffer, UInt32 bufferSize,
+ int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
+ UInt32 *outSizeProcessed);
+
+#ifdef CONFIG_PASS_KARGS
+#define ENVV(n,v) {.name = (n), .value = (v)}
+struct env_var env_vars[] = {
+ ENVV("board_name", CONFIG_BOARD_NAME),
+ ENVV(NULL, NULL)
+};
+#endif
+
+static void halt(void)
+{
+ printf("\nSystem halted!\n");
+ for(;;);
+}
+
+#if LZMA_WRAPPER
+extern unsigned char _lzma_data_start[];
+extern unsigned char _lzma_data_end[];
+
+unsigned char *data;
+unsigned long datalen;
+
+static __inline__ unsigned char get_byte(void)
+{
+ datalen--;
+ return *data++;
+}
+
+static void decompress_init(void)
+{
+ data = _lzma_data_start;
+ datalen = _lzma_data_end - _lzma_data_start;
+}
+
+static int decompress_data(unsigned char *buffer, UInt32 bufferSize,
+ int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
+ UInt32 *outSizeProcessed)
{
- static unsigned int val;
+ return LzmaDecode(buffer, bufferSize, lc, lp, pb, data, datalen,
+ outStream, outSize, outSizeProcessed);
+}
+#endif /* LZMA_WRAPPER */
+
+#if !(LZMA_WRAPPER)
+
+#define FLASH_BANK_SIZE (2<<20)
- if (((unsigned int)offset % 4) == 0) {
- val = *(unsigned int *)data;
- data += 4;
+static unsigned char *flash_base = (unsigned char *) KSEG1ADDR(ADM5120_FLASH_START);
+static unsigned long flash_ofs = 0;
+static unsigned long flash_max = 0;
+static unsigned long flash_ofs_mask = (FLASH_BANK_SIZE-1);
+
+static __inline__ unsigned char get_byte(void)
+{
+ return *(flash_base+flash_ofs++);
+}
+
+static int lzma_read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
+{
+ unsigned long len;
+
+ if (flash_ofs >= flash_max)
+ return LZMA_RESULT_DATA_ERROR;
+
+ len = flash_max-flash_ofs;
+
+#if (CONFIG_FLASH_SIZE > FLASH_BANK_SIZE)
+ if (flash_ofs < FLASH_BANK_SIZE) {
+ /* switch to bank 0 */
+ DBG("lzma_read_byte: switch to bank 0\n");
+
+ if (len > FLASH_BANK_SIZE-flash_ofs)
+ len = FLASH_BANK_SIZE-flash_ofs;
+ } else {
+ /* switch to bank 1 */
+ DBG("lzma_read_byte: switch to bank 1\n");
}
-
- *bufferSize = 1;
- *buffer = ((unsigned char *)&val) + (offset++ & 3);
-
+#endif
+ DBG("lzma_read_byte: ofs=%08X, len=%08X\n", flash_ofs, len);
+
+ *buffer = flash_base+(flash_ofs & flash_ofs_mask);
+ *bufferSize = len;
+ flash_ofs += len;
+
return LZMA_RESULT_OK;
}
-static __inline__ unsigned char get_byte(void)
+static ILzmaInCallback lzma_callback = {
+ .Read = lzma_read_byte,
+};
+
+static __inline__ unsigned int read_le32(void *buf)
{
- unsigned char *buffer;
- UInt32 fake;
-
- return read_byte(0, &buffer, &fake), *buffer;
+ unsigned char *p = buf;
+
+ return ((unsigned int)p[0] + ((unsigned int)p[1] << 8) +
+ ((unsigned int)p[2] << 16) +((unsigned int)p[3] << 24));
}
+static void decompress_init(void)
+{
+ struct trx_header *hdr = NULL;
+ unsigned long kofs,klen;
+
+ printf("Looking for TRX header... ");
+ /* look for trx header, 32-bit data access */
+ for (flash_ofs = 0; flash_ofs < FLASH_BANK_SIZE; flash_ofs += TRX_ALIGN) {
+ if (read_le32(&flash_base[flash_ofs]) == TRX_MAGIC) {
+ hdr = (struct trx_header *)&flash_base[flash_ofs];
+ break;
+ }
+ }
+
+ if (hdr == NULL) {
+ printf("not found!\n");
+ /* no compressed kernel found, halting */
+ halt();
+ }
+
+ /* compressed kernel is in the partition 0 or 1 */
+ kofs = read_le32(&hdr->offsets[1]);
+ if (kofs == 0 || kofs > 65536) {
+ klen = kofs-read_le32(&hdr->offsets[0]);
+ kofs = read_le32(&hdr->offsets[0]);
+ } else {
+ klen = read_le32(&hdr->offsets[2]);
+ if (klen > kofs)
+ klen -= kofs;
+ else
+ klen = read_le32(&hdr->len)-kofs;
+ }
+
+ printf("found at %08X, kernel:%08X len:%08X\n", flash_ofs,
+ kofs, klen);
+
+ flash_ofs += kofs;
+ flash_max = flash_ofs+klen;
+}
+
+static int decompress_data(unsigned char *buffer, UInt32 bufferSize,
+ int lc, int lp, int pb, unsigned char *outStream, UInt32 outSize,
+ UInt32 *outSizeProcessed)
+{
+ return LzmaDecode(buffer, bufferSize, lc, lp, pb, &lzma_callback,
+ outStream, outSize, outSizeProcessed);
+}
+#endif /* !(LZMA_WRAPPER) */
+
/* should be the first function */
-void entry(unsigned long reg_a0, unsigned long reg_a1,
+void decompress_entry(unsigned long reg_a0, unsigned long reg_a1,
unsigned long reg_a2, unsigned long reg_a3,
- unsigned long icache_size, unsigned long icache_lsize,
+ unsigned long icache_size, unsigned long icache_lsize,
unsigned long dcache_size, unsigned long dcache_lsize)
{
unsigned int i; /* temp value */
unsigned int lp; /* literal pos state bits */
unsigned int pb; /* pos state bits */
unsigned int osize; /* uncompressed size */
+ int res;
- ILzmaInCallback callback;
- callback.Read = read_byte;
+ board_init();
- uart_write_str("decompress kernel ... ");
-
- /* look for trx header, 32-bit data access */
- for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
- ((struct trx_header *)data)->magic != TRX_MAGIC; data += 65536);
-
- /* compressed kernel is in the partition 0 or 1 */
- if (((struct trx_header *)data)->offsets[1] > 65536)
- data += ((struct trx_header *)data)->offsets[0];
- else
- data += ((struct trx_header *)data)->offsets[1];
+ printf("\n\nLZMA loader for " CONFIG_BOARD_NAME
+ ", Copyright (C) 2007 OpenWrt.org\n\n");
- offset = 0;
+ decompress_init();
/* lzma args */
i = get_byte();
((unsigned int)get_byte() << 24);
/* skip rest of the header (upper half of uncompressed size) */
- for (i = 0; i < 4; i++)
+ for (i = 0; i < 4; i++)
get_byte();
- /* decompress kernel */
- if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
- (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
- {
- blast_dcache(dcache_size, dcache_lsize);
- blast_icache(icache_size, icache_lsize);
-
- /* Jump to load address */
- uart_write_str("ok\r\n");
- ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
- }
- uart_write_str("failed\r\n");
- while (1 );
-}
-
-/* *********************************************************************
- *
- * ADM5120 UART driver File: dev_adm_uart.c
- *
- * This is a console device driver for an ADM5120 UART
- *
- *********************************************************************
- *
- * Copyright 2006
- * Compex Systems. All rights reserved.
- *
- ********************************************************************* */
-
-#define READCSR(r) *(volatile UInt32 *)(0xB2600000+(r))
-#define WRITECSR(r,v) *(volatile UInt32 *)(0xB2600000+(r)) = v
-
-#define UART_DR_REG 0x00
-#define UART_FR_REG 0x18
-#define UART_TX_FIFO_FULL 0x20
-
-int uart_write(int val)
-{
- WRITECSR(UART_DR_REG, val);
- while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
- return 0;
-}
+ printf("decompressing kernel... ");
-int uart_write_str(char * str)
-{
- while ( *str != 0 ) {
- uart_write ( *str++ );
- }
- return 0;
-}
-
-int uart_write_hex(int val)
-{
- int i;
- int tmp;
-
- uart_write_str("0x");
- for ( i=0 ; i<8 ; i++ ) {
- tmp = (val >> ((7-i) * 4 )) & 0xf;
- tmp = tmp < 10 ? (tmp + '0') : (tmp + 'A' - 10);
- uart_write(tmp);
- }
- uart_write_str("\r\n");
- return 0;
+ /* decompress kernel */
+ res = decompress_data(workspace, ~0, lc, lp, pb,
+ (unsigned char *)LOADADDR, osize, &i);
+
+ if (res != LZMA_RESULT_OK) {
+ printf("failed, ");
+ switch (res) {
+ case LZMA_RESULT_DATA_ERROR:
+ printf("data error!\n");
+ break;
+ case LZMA_RESULT_NOT_ENOUGH_MEM:
+ printf("not enough memory!\n");
+ break;
+ default:
+ printf("unknown error %d!\n", res);
+ }
+ halt();
+ } else
+ printf("done!\n");
+
+ blast_dcache(dcache_size, dcache_lsize);
+ blast_icache(icache_size, icache_lsize);
+
+ printf("launching kernel...\n\n");
+
+#ifdef CONFIG_PASS_KARGS
+ reg_a0 = 0;
+ reg_a1 = 0;
+ reg_a2 = (unsigned long)env_vars;
+ reg_a3 = 0;
+#endif
+ /* Jump to load address */
+ ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
}
-
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