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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright IBM Corp. 2017
* Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
*/
#ifndef PAGE_STATES_H
#define PAGE_STATES_H
#include <asm/sections.h>
#include <asm/page.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
extern int __bootdata_preserved(cmma_flag);
static __always_inline unsigned long essa(unsigned long paddr, unsigned char cmd)
{
unsigned long rc;
asm volatile(
" .insn rrf,0xb9ab0000,%[rc],%[paddr],%[cmd],0"
: [rc] "=d" (rc)
: [paddr] "d" (paddr),
[cmd] "i" (cmd));
return rc;
}
static __always_inline void __set_page_state(void *addr, unsigned long num_pages, unsigned char cmd)
{
unsigned long paddr = __pa(addr) & PAGE_MASK;
while (num_pages--) {
essa(paddr, cmd);
paddr += PAGE_SIZE;
}
}
static inline void __set_page_unused(void *addr, unsigned long num_pages)
{
__set_page_state(addr, num_pages, ESSA_SET_UNUSED);
}
static inline void __set_page_stable_dat(void *addr, unsigned long num_pages)
{
__set_page_state(addr, num_pages, ESSA_SET_STABLE);
}
static inline void __set_page_stable_nodat(void *addr, unsigned long num_pages)
{
__set_page_state(addr, num_pages, ESSA_SET_STABLE_NODAT);
}
static inline void __arch_set_page_nodat(void *addr, unsigned long num_pages)
{
if (!cmma_flag)
return;
if (cmma_flag < 2)
__set_page_stable_dat(addr, num_pages);
else
__set_page_stable_nodat(addr, num_pages);
}
static inline void __arch_set_page_dat(void *addr, unsigned long num_pages)
{
if (!cmma_flag)
return;
__set_page_stable_dat(addr, num_pages);
}
#endif