| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright IBM Corp. 2017, 2022 |
| * Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> |
| * Nico Boehr <nrb@linux.ibm.com> |
| */ |
| #include <asm/interrupt.h> |
| |
| #ifndef PAGE_STATES_H |
| #define PAGE_STATES_H |
| |
| #define ESSA_GET_STATE 0 |
| #define ESSA_SET_STABLE 1 |
| #define ESSA_SET_UNUSED 2 |
| #define ESSA_SET_VOLATILE 3 |
| #define ESSA_SET_POT_VOLATILE 4 |
| #define ESSA_SET_STABLE_RESIDENT 5 |
| #define ESSA_SET_STABLE_IF_RESIDENT 6 |
| #define ESSA_SET_STABLE_NODAT 7 |
| |
| #define ESSA_MAX ESSA_SET_STABLE_NODAT |
| |
| #define ESSA_USAGE_STABLE 0 |
| #define ESSA_USAGE_UNUSED 1 |
| #define ESSA_USAGE_POT_VOLATILE 2 |
| #define ESSA_USAGE_VOLATILE 3 |
| |
| static unsigned long essa(uint8_t state, unsigned long paddr) |
| { |
| uint64_t extr_state; |
| |
| asm volatile(".insn rrf,0xb9ab0000,%[extr_state],%[addr],%[new_state],0" \ |
| : [extr_state] "=d" (extr_state) \ |
| : [addr] "a" (paddr), [new_state] "i" (state)); |
| |
| return (unsigned long)extr_state; |
| } |
| |
| /* |
| * Unfortunately the availability is not indicated by stfl bits, but |
| * we have to try to execute it and test for an operation exception. |
| */ |
| static inline bool check_essa_available(void) |
| { |
| expect_pgm_int(); |
| essa(ESSA_GET_STATE, 0); |
| return clear_pgm_int() == 0; |
| } |
| |
| #endif |
