Move load_firmware() to separate file

The idea is to share loading code between bootloaders and rolo().

Change-Id: I1656ed91946d7a05cb7c9fa7a16793c3c862a5cd
Reviewed-on: http://gerrit.rockbox.org/190
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>

1 files changed, 17 insertions, 257 deletions

diff --git a/bootloader/main-pp.c b/bootloader/main-pp.c
index 72d45712fc..b03a5a75c6 100644
--- a/bootloader/main-pp.c
+++ b/bootloader/main-pp.c
@@ -37,6 +37,8 @@
 #include "button.h"
 #include "disk.h"
 #include "crc32-mi4.h"
+#include "mi4-loader.h"
+#include "loader_strerror.h"
 #include <string.h>
 #include "power.h"
 #include "version.h"
@@ -110,21 +112,6 @@ unsigned char *loadbuffer = (unsigned char *)DRAM_START;
 
 #define MI4_HEADER_SIZE     0x200
 
-/* mi4 header structure */
-struct mi4header_t {
-    unsigned char magic[4];
-    uint32_t version;
-    uint32_t length;
-    uint32_t crc32;
-    uint32_t enctype;
-    uint32_t mi4size;
-    uint32_t plaintext;
-    uint32_t dsa_key[10];
-    uint32_t pad[109];
-    unsigned char type[4];
-    unsigned char model[4];
-};
-
 /* PPMI header structure */
 struct ppmi_header_t {
     unsigned char magic[4];
@@ -132,236 +119,6 @@ struct ppmi_header_t {
     uint32_t pad[126];
 };
 
-inline unsigned int le2int(unsigned char* buf)
-{
-   int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
-
-   return res;
-}
-
-inline void int2le(unsigned int val, unsigned char* addr)
-{
-    addr[0] = val & 0xFF;
-    addr[1] = (val >> 8) & 0xff;
-    addr[2] = (val >> 16) & 0xff;
-    addr[3] = (val >> 24) & 0xff;
-}
-
-struct tea_key {
-  const char * name;
-  uint32_t     key[4];
-};
-
-#define NUM_KEYS (sizeof(tea_keytable)/sizeof(tea_keytable[0]))
-struct tea_key tea_keytable[] = {
-  { "default" ,          { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
-  { "sansa",             { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
-  { "sansa_gh",          { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
-  { "sansa_103",         { 0x1d29ddc0, 0x2579c2cd, 0xce339e1a, 0x75465dfe } },
-  { "rhapsody",          { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
-  { "p610",              { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
-  { "p640",              { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
-  { "virgin",            { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
-  { "20gc_eng",          { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
-  { "20gc_fre",          { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
-  { "elio_p722",         { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
-  { "c200",              { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
-  { "c200_103",          { 0x2a7968de, 0x15127979, 0x142e60a7, 0xe49c1893 } },
-  { "c200_106",          { 0xa913d139, 0xf842f398, 0x3e03f1a6, 0x060ee012 } },
-  { "view",              { 0x70e19bda, 0x0c69ea7d, 0x2b8b1ad1, 0xe9767ced } },
-  { "sa9200",            { 0x33ea0236, 0x9247bdc5, 0xdfaedf9f, 0xd67c9d30 } },
-  { "hdd1630/hdd63x0",   { 0x04543ced, 0xcebfdbad, 0xf7477872, 0x0d12342e } },
-  { "vibe500",           { 0xe3a66156, 0x77c6b67a, 0xe821dca5, 0xca8ca37c } },
-};
-
-/*
-
-tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
-
-"Following is an adaptation of the reference encryption and decryption
-routines in C, released into the public domain by David Wheeler and
-Roger Needham:"
-
-*/
-
-/* NOTE: The mi4 version of TEA uses a different initial value to sum compared
-         to the reference implementation and the main loop is 8 iterations, not
-         32.
-*/
-
-static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
-    uint32_t sum=0xF1BBCDC8, i;                    /* set up */
-    uint32_t delta=0x9E3779B9;                     /* a key schedule constant */
-    uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
-    for(i=0; i<8; i++) {                               /* basic cycle start */
-        *v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
-        *v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
-        sum -= delta;                                   /* end cycle */
-    }
-}
-
-/* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
-   integers) and the key is incremented after each block
- */
-
-static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
-{
-    uint32_t v0, v1;
-    unsigned int i;
-
-    for (i = 0; i < (n / 8); i++) {
-        v0 = le2int(src);
-        v1 = le2int(src+4);
-
-        tea_decrypt(&v0, &v1, key);
-
-        int2le(v0, dest);
-        int2le(v1, dest+4);
-
-        src += 8;
-        dest += 8;
-
-        /* Now increment the key */
-        key[0]++;
-        if (key[0]==0) {
-            key[1]++;
-            if (key[1]==0) {
-                key[2]++;
-                if (key[2]==0) {
-                    key[3]++;
-                }
-            }
-        }
-    }
-}
-
-static int tea_find_key(struct mi4header_t *mi4header, unsigned char* buf)
-{
-    unsigned int i;
-    uint32_t key[4];
-    uint32_t keyinc;
-    unsigned char magic_dec[8];
-    int key_found = -1;
-    unsigned int magic_location = mi4header->length-4;
-    int unaligned = 0;
-
-    if ( (magic_location % 8) != 0 )
-    {
-        unaligned = 1;
-        magic_location -= 4;
-    }
-
-    printf("Searching for key:");
-
-    for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
-        key[0] = tea_keytable[i].key[0];
-        key[1] = tea_keytable[i].key[1];
-        key[2] = tea_keytable[i].key[2];
-        key[3] = tea_keytable[i].key[3];
-
-        /* Now increment the key */
-        keyinc = (magic_location-mi4header->plaintext)/8;
-        if ((key[0]+keyinc) < key[0]) key[1]++;
-        key[0] += keyinc;
-        if (key[1]==0) key[2]++;
-        if (key[2]==0) key[3]++;
-
-        /* Decrypt putative magic */
-        tea_decrypt_buf(&buf[magic_location], magic_dec, 8, key);
-
-        if (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55)
-        {
-            key_found = i;
-            printf("%s...found", tea_keytable[i].name);
-        } else {
-           /* printf("%s...failed", tea_keytable[i].name); */
-        }
-    }
-
-    return key_found;
-}
-
-
-/* Load mi4 format firmware image */
-int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
-{
-    int fd;
-    struct mi4header_t mi4header;
-    int rc;
-    unsigned long sum;
-    char filename[MAX_PATH];
-
-    snprintf(filename,sizeof(filename), BOOTDIR "/%s",firmware);
-    fd = open(filename, O_RDONLY);
-    if(fd < 0)
-    {
-        snprintf(filename,sizeof(filename),"/%s",firmware);
-        fd = open(filename, O_RDONLY);
-        if(fd < 0)
-            return EFILE_NOT_FOUND;
-    }
-
-    read(fd, &mi4header, MI4_HEADER_SIZE);
-
-    /* MI4 file size */
-    printf("mi4 size: %x", mi4header.mi4size);
-
-    if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
-    {
-        close(fd);
-        return EFILE_TOO_BIG;
-    }
-
-    /* CRC32 */
-    printf("CRC32: %x", mi4header.crc32);
-
-    /* Rockbox model id */
-    printf("Model id: %.4s", mi4header.model);
-
-    /* Read binary type (RBOS, RBBL) */
-    printf("Binary type: %.4s", mi4header.type);
-
-    /* Load firmware file */
-    lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
-    rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
-    close(fd);
-    if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
-        return EREAD_IMAGE_FAILED;
-
-    /* Check CRC32 to see if we have a valid file */
-    sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
-
-    printf("Calculated CRC32: %x", sum);
-
-    if(sum != mi4header.crc32)
-        return EBAD_CHKSUM;
-
-    if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
-    {
-        /* Load encrypted firmware */
-        int key_index = tea_find_key(&mi4header, buf);
-        
-        if (key_index < 0)
-            return EINVALID_FORMAT;
-        
-        /* Plaintext part is already loaded */
-        buf += mi4header.plaintext;
-        
-        /* Decrypt in-place */
-        tea_decrypt_buf(buf, buf, 
-                        mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
-                        tea_keytable[key_index].key);
-
-        printf("%s key used", tea_keytable[key_index].name);
-        
-        /* Check decryption was successfull */
-        if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
-            return EREAD_IMAGE_FAILED;
-    }
-
-    return EOK;
-}
-
 #if (CONFIG_STORAGE & STORAGE_SD)
 /* Load mi4 firmware from a hidden disk partition */
 int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
@@ -432,7 +189,7 @@ int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
     (void) disable_rebuild;
 #endif
 
-    return EOK;
+    return mi4header.mi4size-MI4_HEADER_SIZE;
 }
 #endif /* (CONFIG_STORAGE & STORAGE_SD) */
 
@@ -528,6 +285,7 @@ static int handle_usb(int connect_timeout)
 
 void* main(void)
 {
+    char filename[MAX_PATH];
     int i;
     int btn;
     int rc;
@@ -642,13 +400,15 @@ void* main(void)
     if((btn & BOOTLOADER_BOOT_OF) == 0)
     {
         printf("Loading Rockbox...");
-        rc = load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
-        if (rc < EOK)
+        snprintf(filename,sizeof(filename), BOOTDIR "/%s", BOOTFILE);
+
+        rc = load_mi4(loadbuffer, filename, MAX_LOADSIZE);
+        if (rc <= EFILE_EMPTY)
         {
             bool old_verbose = verbose;
             verbose = true;
             printf("Can't load " BOOTFILE ": ");
-            printf(strerror(rc));
+            printf(loader_strerror(rc));
             verbose = old_verbose;
             btn |= BOOTLOADER_BOOT_OF;
             sleep(5*HZ);
@@ -676,9 +436,9 @@ void* main(void)
         {
             rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE,
                                usb == USB_INSERTED);
-            if (rc < EOK) {
+            if (rc <= EFILE_EMPTY) {
                 printf("Can't load from partition");
-                printf(strerror(rc));
+                printf(loader_strerror(rc));
             } else {
                 goto main_exit;
             }
@@ -690,9 +450,9 @@ void* main(void)
 #if defined(PHILIPS_HDD1630) || defined(PHILIPS_HDD6330) || defined(PHILIPS_SA9200)
         printf("Trying /System/OF.ebn");
         rc=load_mi4(loadbuffer, "/System/OF.ebn", MAX_LOADSIZE);
-        if (rc < EOK) {
+        if (rc <= EFILE_EMPTY) {
             printf("Can't load /System/OF.ebn");
-            printf(strerror(rc));
+            printf(loader_strerror(rc));
         } else {
             goto main_exit;
         }
@@ -700,9 +460,9 @@ void* main(void)
 
         printf("Trying /System/OF.mi4");
         rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
-        if (rc < EOK) {
+        if (rc <= EFILE_EMPTY) {
             printf("Can't load /System/OF.mi4");
-            printf(strerror(rc));
+            printf(loader_strerror(rc));
         } else {
 #if defined(SAMSUNG_YH925)
             lcd_reset();
@@ -712,9 +472,9 @@ void* main(void)
 
         printf("Trying /System/OF.bin");
         rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
-        if (rc < EOK) {
+        if (rc <= EFILE_EMPTY) {
             printf("Can't load /System/OF.bin");
-            printf(strerror(rc));
+            printf(loader_strerror(rc));
         } else {
 #if defined(SAMSUNG_YH925)
             lcd_reset();