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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2024 ARM Ltd.
*/
#ifndef __ASM_RSI_H_
#define __ASM_RSI_H_
#include <linux/errno.h>
#include <linux/jump_label.h>
#include <asm/rsi_cmds.h>
DECLARE_STATIC_KEY_FALSE(rsi_present);
void __init arm64_rsi_init(void);
bool __arm64_is_protected_mmio(phys_addr_t base, size_t size);
static inline bool is_realm_world(void)
{
return static_branch_unlikely(&rsi_present);
}
static inline int rsi_set_memory_range(phys_addr_t start, phys_addr_t end,
enum ripas state, unsigned long flags)
{
unsigned long ret;
phys_addr_t top;
while (start != end) {
ret = rsi_set_addr_range_state(start, end, state, flags, &top);
if (ret || top < start || top > end)
return -EINVAL;
start = top;
}
return 0;
}
/*
* Convert the specified range to RAM. Do not use this if you rely on the
* contents of a page that may already be in RAM state.
*/
static inline int rsi_set_memory_range_protected(phys_addr_t start,
phys_addr_t end)
{
return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
RSI_CHANGE_DESTROYED);
}
/*
* Convert the specified range to RAM. Do not convert any pages that may have
* been DESTROYED, without our permission.
*/
static inline int rsi_set_memory_range_protected_safe(phys_addr_t start,
phys_addr_t end)
{
return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
RSI_NO_CHANGE_DESTROYED);
}
static inline int rsi_set_memory_range_shared(phys_addr_t start,
phys_addr_t end)
{
return rsi_set_memory_range(start, end, RSI_RIPAS_EMPTY,
RSI_CHANGE_DESTROYED);
}
#endif /* __ASM_RSI_H_ */
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