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