embedded/arch/arm/mach-lpc17xx/libs/hal/hal_reserve_usb_ram.c

   1 #include <stdint.h>
   2 #include <string.h>
   3 #include <hal_machperiph.h>
   4
   5 extern char _eusbram;
   6
   7 void *lpc_reserve_usb_ram(unsigned long size)
   8 {
   9   static char *usb_ram_avail=&_eusbram;
  10   char *prev_avail;
  11
  12   /*printf("usb reserve %lu at 0x%lx\n",size,(unsigned long)usb_ram_avail);*/
  13
  14   if(!usb_ram_avail)
  15     return NULL;
  16
  17   prev_avail=(char *)(((uintptr_t)usb_ram_avail+3)&~3);
  18   usb_ram_avail=prev_avail+size;
  19
  20   return prev_avail;
  21 }