--- /dev/null
+/*
+ * LZMA compressed kernel loader for Atheros AR7XXX/AR9XXX based boards
+ *
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Some parts of this code was based on the OpenWrt specific lzma-loader
+ * for the BCM47xx and ADM5120 based boards:
+ * Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
+ * Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
+ * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
+ *
+ * The image_header structure has been taken from the U-Boot project.
+ * (C) Copyright 2008 Semihalf
+ * (C) Copyright 2000-2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "config.h"
+#include "cache.h"
+#include "printf.h"
+#include "LzmaDecode.h"
+
+#define AR71XX_FLASH_START 0x1f000000
+#define AR71XX_FLASH_END 0x1fe00000
+
+#define KSEG0 0x80000000
+#define KSEG1 0xa0000000
+
+#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
+
+#undef LZMA_DEBUG
+
+#ifdef LZMA_DEBUG
+# define DBG(f, a...) printf(f, ## a)
+#else
+# define DBG(f, a...) do {} while (0)
+#endif
+
+#define IH_MAGIC_OKLI 0x4f4b4c49 /* 'OKLI' */
+
+#define IH_NMLEN 32 /* Image Name Length */
+
+typedef struct image_header {
+ uint32_t ih_magic; /* Image Header Magic Number */
+ uint32_t ih_hcrc; /* Image Header CRC Checksum */
+ uint32_t ih_time; /* Image Creation Timestamp */
+ uint32_t ih_size; /* Image Data Size */
+ uint32_t ih_load; /* Data Load Address */
+ uint32_t ih_ep; /* Entry Point Address */
+ uint32_t ih_dcrc; /* Image Data CRC Checksum */
+ uint8_t ih_os; /* Operating System */
+ uint8_t ih_arch; /* CPU architecture */
+ uint8_t ih_type; /* Image Type */
+ uint8_t ih_comp; /* Compression Type */
+ uint8_t ih_name[IH_NMLEN]; /* Image Name */
+} image_header_t;
+
+/* beyond the image end, size not known in advance */
+extern unsigned char workspace[];
+extern void board_init(void);
+
+static CLzmaDecoderState lzma_state;
+static unsigned char *lzma_data;
+static unsigned long lzma_datasize;
+static unsigned long lzma_outsize;
+static unsigned long kernel_la;
+
+#ifdef CONFIG_KERNEL_CMDLINE
+#define kernel_argc 1
+static const char kernel_cmdline[] = CONFIG_KERNEL_CMDLINE;
+static const char *kernel_argv[] = {
+ kernel_cmdline,
+ NULL,
+};
+#endif /* CONFIG_KERNEL_CMDLINE */
+
+static void halt(void)
+{
+ printf("\nSystem halted!\n");
+ for(;;);
+}
+
+static __inline__ unsigned long get_be32(void *buf)
+{
+ unsigned char *p = buf;
+
+ return (((unsigned long) p[0] << 24) +
+ ((unsigned long) p[1] << 16) +
+ ((unsigned long) p[2] << 8) +
+ (unsigned long) p[3]);
+}
+
+static __inline__ unsigned char lzma_get_byte(void)
+{
+ unsigned char c;
+
+ lzma_datasize--;
+ c = *lzma_data++;
+
+ return c;
+}
+
+static int lzma_init_props(void)
+{
+ unsigned char props[LZMA_PROPERTIES_SIZE];
+ int res;
+ int i;
+
+ /* read lzma properties */
+ for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
+ props[i] = lzma_get_byte();
+
+ /* read the lower half of uncompressed size in the header */
+ lzma_outsize = ((SizeT) lzma_get_byte()) +
+ ((SizeT) lzma_get_byte() << 8) +
+ ((SizeT) lzma_get_byte() << 16) +
+ ((SizeT) lzma_get_byte() << 24);
+
+ /* skip rest of the header (upper half of uncompressed size) */
+ for (i = 0; i < 4; i++)
+ lzma_get_byte();
+
+ res = LzmaDecodeProperties(&lzma_state.Properties, props,
+ LZMA_PROPERTIES_SIZE);
+ return res;
+}
+
+static int lzma_decompress(unsigned char *outStream)
+{
+ SizeT ip, op;
+ int ret;
+
+ lzma_state.Probs = (CProb *) workspace;
+
+ ret = LzmaDecode(&lzma_state, lzma_data, lzma_datasize, &ip, outStream,
+ lzma_outsize, &op);
+
+ if (ret != LZMA_RESULT_OK) {
+ int i;
+
+ DBG("LzmaDecode error %d at %08x, osize:%d ip:%d op:%d\n",
+ ret, lzma_data + ip, lzma_outsize, ip, op);
+
+ for (i = 0; i < 16; i++)
+ DBG("%02x ", lzma_data[ip + i]);
+
+ DBG("\n");
+ }
+
+ return ret;
+}
+
+#if (LZMA_WRAPPER)
+static void lzma_init_data(void)
+{
+ extern unsigned char _lzma_data_start[];
+ extern unsigned char _lzma_data_end[];
+
+ kernel_la = LOADADDR;
+ lzma_data = _lzma_data_start;
+ lzma_datasize = _lzma_data_end - _lzma_data_start;
+}
+#else
+static void lzma_init_data(void)
+{
+ struct image_header *hdr = NULL;
+ unsigned char *flash_base;
+ unsigned long flash_ofs;
+ unsigned long kernel_ofs;
+ unsigned long kernel_size;
+
+ flash_base = (unsigned char *) KSEG1ADDR(AR71XX_FLASH_START);
+
+ printf("Looking for OpenWrt image... ");
+
+ for (flash_ofs = CONFIG_FLASH_OFFS;
+ flash_ofs <= (CONFIG_FLASH_OFFS + CONFIG_FLASH_MAX);
+ flash_ofs += CONFIG_FLASH_STEP) {
+ unsigned long magic;
+ unsigned char *p;
+
+ p = flash_base + flash_ofs;
+ magic = get_be32(p);
+ if (magic == IH_MAGIC_OKLI) {
+ hdr = (struct image_header *) p;
+ break;
+ }
+ }
+
+ if (hdr == NULL) {
+ printf("not found!\n");
+ halt();
+ }
+
+ printf("found at 0x%08x\n", flash_base + flash_ofs);
+
+ kernel_ofs = sizeof(struct image_header);
+ kernel_size = get_be32(&hdr->ih_size);
+ kernel_la = get_be32(&hdr->ih_load);
+
+ lzma_data = flash_base + flash_ofs + kernel_ofs;
+ lzma_datasize = kernel_size;
+}
+#endif /* (LZMA_WRAPPER) */
+
+void loader_main(unsigned long reg_a0, unsigned long reg_a1,
+ unsigned long reg_a2, unsigned long reg_a3)
+{
+ void (*kernel_entry) (unsigned long, unsigned long, unsigned long,
+ unsigned long);
+ int res;
+
+ board_init();
+
+ printf("\n\nOpenWrt kernel loader for MIPS based SoC\n");
+ printf("Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>\n");
+
+ lzma_init_data();
+
+ res = lzma_init_props();
+ if (res != LZMA_RESULT_OK) {
+ printf("Incorrect LZMA stream properties!\n");
+ halt();
+ }
+
+ printf("Decompressing kernel... ");
+
+ res = lzma_decompress((unsigned char *) kernel_la);
+ if (res != LZMA_RESULT_OK) {
+ printf("failed, ");
+ switch (res) {
+ case LZMA_RESULT_DATA_ERROR:
+ printf("data error!\n");
+ break;
+ default:
+ printf("unknown error %d!\n", res);
+ }
+ halt();
+ } else {
+ printf("done!\n");
+ }
+
+ flush_cache(kernel_la, lzma_outsize);
+
+ printf("Starting kernel at %08x...\n\n", kernel_la);
+
+#ifdef CONFIG_KERNEL_CMDLINE
+ reg_a0 = kernel_argc;
+ reg_a1 = (unsigned long) kernel_argv;
+ reg_a2 = 0;
+ reg_a3 = 0;
+#endif
+
+ kernel_entry = (void *) kernel_la;
+ kernel_entry(reg_a0, reg_a1, reg_a2, reg_a3);
+}
projects / openwrt.git / blobdiff