arch/s390/include/asm/page-states.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *    Copyright IBM Corp. 2017
   4  *    Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
   5  */
   6
   7 #ifndef PAGE_STATES_H
   8 #define PAGE_STATES_H
   9
  10 #include <asm/sections.h>
  11 #include <asm/page.h>
  12
  13 #define ESSA_GET_STATE                  0
  14 #define ESSA_SET_STABLE                 1
  15 #define ESSA_SET_UNUSED                 2
  16 #define ESSA_SET_VOLATILE               3
  17 #define ESSA_SET_POT_VOLATILE           4
  18 #define ESSA_SET_STABLE_RESIDENT        5
  19 #define ESSA_SET_STABLE_IF_RESIDENT     6
  20 #define ESSA_SET_STABLE_NODAT           7
  21
  22 #define ESSA_MAX        ESSA_SET_STABLE_NODAT
  23
  24 extern int __bootdata_preserved(cmma_flag);
  25
  26 static __always_inline unsigned long essa(unsigned long paddr, unsigned char cmd)
  27 {
  28         unsigned long rc;
  29
  30         asm volatile(
  31                 "       .insn   rrf,0xb9ab0000,%[rc],%[paddr],%[cmd],0"
  32                 : [rc] "=d" (rc)
  33                 : [paddr] "d" (paddr),
  34                   [cmd] "i" (cmd));
  35         return rc;
  36 }
  37
  38 static __always_inline void __set_page_state(void *addr, unsigned long num_pages, unsigned char cmd)
  39 {
  40         unsigned long paddr = __pa(addr) & PAGE_MASK;
  41
  42         while (num_pages--) {
  43                 essa(paddr, cmd);
  44                 paddr += PAGE_SIZE;
  45         }
  46 }
  47
  48 static inline void __set_page_unused(void *addr, unsigned long num_pages)
  49 {
  50         __set_page_state(addr, num_pages, ESSA_SET_UNUSED);
  51 }
  52
  53 static inline void __set_page_stable_dat(void *addr, unsigned long num_pages)
  54 {
  55         __set_page_state(addr, num_pages, ESSA_SET_STABLE);
  56 }
  57
  58 static inline void __set_page_stable_nodat(void *addr, unsigned long num_pages)
  59 {
  60         __set_page_state(addr, num_pages, ESSA_SET_STABLE_NODAT);
  61 }
  62
  63 #endif