p1275.c 1.2 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
  1. /*
  2. * p1275.c: Sun IEEE 1275 PROM low level interface routines
  3. *
  4. * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  5. */
  6. #include <linux/kernel.h>
  7. #include <linux/init.h>
  8. #include <linux/sched.h>
  9. #include <linux/smp.h>
  10. #include <linux/string.h>
  11. #include <linux/spinlock.h>
  12. #include <asm/openprom.h>
  13. #include <asm/oplib.h>
  14. #include <asm/spitfire.h>
  15. #include <asm/pstate.h>
  16. #include <asm/ldc.h>
  17. struct {
  18. long prom_callback; /* 0x00 */
  19. void (*prom_cif_handler)(long *); /* 0x08 */
  20. unsigned long prom_cif_stack; /* 0x10 */
  21. } p1275buf;
  22. extern void prom_world(int);
  23. extern void prom_cif_direct(unsigned long *args);
  24. extern void prom_cif_callback(void);
  25. /*
  26. * This provides SMP safety on the p1275buf.
  27. */
  28. DEFINE_RAW_SPINLOCK(prom_entry_lock);
  29. void p1275_cmd_direct(unsigned long *args)
  30. {
  31. unsigned long flags;
  32. raw_local_save_flags(flags);
  33. raw_local_irq_restore((unsigned long)PIL_NMI);
  34. raw_spin_lock(&prom_entry_lock);
  35. prom_world(1);
  36. prom_cif_direct(args);
  37. prom_world(0);
  38. raw_spin_unlock(&prom_entry_lock);
  39. raw_local_irq_restore(flags);
  40. }
  41. void prom_cif_init(void *cif_handler, void *cif_stack)
  42. {
  43. p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
  44. p1275buf.prom_cif_stack = (unsigned long)cif_stack;
  45. }