/* Round start to nearest page boundary below and set len so that the resulting address range ends at the lowest
* possible page boundary where the original address range is still entirely contained. It returns the
* difference between the rounded start address and the original start address. */
static uintptr_t round_to_page_boundaries(uintptr_t *start, size_t *len)
{
uintptr_t page_size = getpagesize();
uintptr_t page_mask = ~(page_size-1);
uintptr_t end = *start + *len;
uintptr_t old_start = *start;
msg_gspew("page_size=%" PRIxPTR "\n", page_size);
msg_gspew("pre-rounding: start=0x%0*" PRIxPTR ", len=0x%zx, end=0x%0*" PRIxPTR "\n",
PRIxPTR_WIDTH, *start, *len, PRIxPTR_WIDTH, end);
*start = *start & page_mask;
end = (end + page_size - 1) & page_mask;
*len = end - *start;
msg_gspew("post-rounding: start=0x%0*" PRIxPTR ", len=0x%zx, end=0x%0*" PRIxPTR "\n",
PRIxPTR_WIDTH, *start, *len, PRIxPTR_WIDTH, *start + *len);
return old_start - *start;
}
/* returns the index of the entry (or a negative value if it is not found) */
static int find_romentry(char *name)
{
int i;
if (num_rom_entries == 0)
return -1;
msg_gspew("Looking for region \"%s\"... ", name);
for (i = 0; i < num_rom_entries; i++) {
if (!strcmp(rom_entries[i].name, name)) {
rom_entries[i].included = 1;
msg_gspew("found.\n");
return i;
}
}
msg_gspew("not found.\n");
return -1;
}