patch-2.4.0-test7 linux/arch/arm/boot/compressed/hw-bse.c

• Lines: 75
• Date: Sun Aug 13 09:54:15 2000
• Orig file: v2.4.0-test6/linux/arch/arm/boot/compressed/hw-bse.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test6/linux/arch/arm/boot/compressed/hw-bse.c linux/arch/arm/boot/compressed/hw-bse.c
@@ -0,0 +1,74 @@
+/*
+ * Bright Star Engineering Inc.
+ *
+ * code for readng parameters from the
+ * parameter blocks of the boot block
+ * flash memory
+ *
+ */
+
+static int strcmp(const char *s1, const char *s2)
+{
+  while (*s1 != '\0' && *s1 == *s2)
+    {
+      s1++;
+      s2++;
+    }
+
+  return (*(unsigned char *) s1) - (*(unsigned char *) s2);
+}
+
+struct pblk_t {
+  char type;
+  unsigned short size;
+};
+
+static char *bse_getflashparam(char *name) {
+  unsigned int esize;
+  char *q,*r;
+  unsigned char *p,*e;
+  struct pblk_t *thepb = (struct pblk_t *) 0x00004000;
+  struct pblk_t *altpb = (struct pblk_t *) 0x00006000;  
+  if (thepb->type&1) {
+    if (altpb->type&1) {
+      /* no valid param block */ 
+      return (char*)0;
+    } else {
+      /* altpb is valid */
+      struct pblk_t *tmp;
+      tmp = thepb;
+      thepb = altpb;
+      altpb = tmp;
+    }
+  }
+  p = (char*)thepb + sizeof(struct pblk_t);
+  e = p + thepb->size; 
+  while (p < e) {
+    q = p;
+    esize = *p;
+    if (esize == 0xFF) break;
+    if (esize == 0) break;
+    if (esize > 127) {
+      esize = (esize&0x7F)<<8 | p[1];
+      q++;
+    }
+    q++;
+    r=q;
+    if (*r && ((name == 0) || (!strcmp(name,r)))) {
+      while (*q++) ;
+      return q;
+    }
+    p+=esize;
+  }
+  return (char*)0;
+}
+
+void bse_setup(void) {
+  /* extract the linux cmdline from flash */
+  char *name=bse_getflashparam("linuxboot");
+  char *x = (char *)0xc0000100;
+  if (name) { 
+    while (*name) *x++=*name++;
+  }
+  *x=0;
+}