LXR linux/arch/powerpc/include/asm/ultravisor.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Ultravisor definitions
   4 *
   5 * Copyright 2019, IBM Corporation.
   6 *
   7 */
   8#ifndef _ASM_POWERPC_ULTRAVISOR_H
   9#define _ASM_POWERPC_ULTRAVISOR_H
  10
  11#include <asm/asm-prototypes.h>
  12#include <asm/ultravisor-api.h>
  13#include <asm/firmware.h>
  14
  15int early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
  16                                  int depth, void *data);
  17
  18/*
  19 * In ultravisor enabled systems, PTCR becomes ultravisor privileged only for
  20 * writing and an attempt to write to it will cause a Hypervisor Emulation
  21 * Assistance interrupt.
  22 */
  23static inline void set_ptcr_when_no_uv(u64 val)
  24{
  25        if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
  26                mtspr(SPRN_PTCR, val);
  27}
  28
  29static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1)
  30{
  31        return ucall_norets(UV_WRITE_PATE, lpid, dw0, dw1);
  32}
  33
  34static inline int uv_share_page(u64 pfn, u64 npages)
  35{
  36        return ucall_norets(UV_SHARE_PAGE, pfn, npages);
  37}
  38
  39static inline int uv_unshare_page(u64 pfn, u64 npages)
  40{
  41        return ucall_norets(UV_UNSHARE_PAGE, pfn, npages);
  42}
  43
  44static inline int uv_unshare_all_pages(void)
  45{
  46        return ucall_norets(UV_UNSHARE_ALL_PAGES);
  47}
  48
  49#endif  /* _ASM_POWERPC_ULTRAVISOR_H */
  50