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lib: sbi: Factor-out PMP programming into separate sources

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The PMP programming is a significant part of sbi_hart.c so factor-out
this into separate sources sbi_hart_pmp.c and sbi_hart_pmp.h for better
maintainability.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20251209135235.423391-6-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2025-12-09 19:22:35 +05:30
committed by Anup Patel
parent 42139bb9b7
commit 5eec86eec8
6 changed files with 382 additions and 351 deletions
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22
include/sbi/sbi_hart.h
View File

@@ -107,21 +107,6 @@ enum sbi_hart_csrs {
SBI_HART_CSR_MAX,
};
/*
* Smepmp enforces access boundaries between M-mode and
* S/U-mode. When it is enabled, the PMPs are programmed
* such that M-mode doesn't have access to S/U-mode memory.
*
* To give M-mode R/W access to the shared memory between M and
* S/U-mode, first entry is reserved. It is disabled at boot.
* When shared memory access is required, the physical address
* should be programmed into the first PMP entry with R/W
* permissions to the M-mode. Once the work is done, it should be
* unmapped. sbi_hart_protection_map_range/sbi_hart_protection_unmap_range
* function pair should be used to map/unmap the shared memory.
*/
#define SBI_SMEPMP_RESV_ENTRY 0
struct sbi_hart_features {
bool detected;
int priv_version;
@@ -134,6 +119,9 @@ struct sbi_hart_features {
unsigned int mhpm_bits;
};
extern unsigned long hart_features_offset;
#define sbi_hart_features_ptr(__s) sbi_scratch_offset_ptr(__s, hart_features_offset)
struct sbi_scratch;
int sbi_hart_reinit(struct sbi_scratch *scratch);
@@ -144,11 +132,7 @@ extern void (*sbi_hart_expected_trap)(void);
unsigned int sbi_hart_mhpm_mask(struct sbi_scratch *scratch);
void sbi_hart_delegation_dump(struct sbi_scratch *scratch,
const char *prefix, const char *suffix);
unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_log2gran(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_addrbits(struct sbi_scratch *scratch);
unsigned int sbi_hart_mhpm_bits(struct sbi_scratch *scratch);
bool sbi_hart_smepmp_is_fw_region(unsigned int pmp_idx);
int sbi_hart_priv_version(struct sbi_scratch *scratch);
void sbi_hart_get_priv_version_str(struct sbi_scratch *scratch,
char *version_str, int nvstr);

20
include/sbi/sbi_hart_pmp.h Normal file
View File

@@ -0,0 +1,20 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2025 Ventana Micro Systems Inc.
*/
#ifndef __SBI_HART_PMP_H__
#define __SBI_HART_PMP_H__
#include <sbi/sbi_types.h>
struct sbi_scratch;
unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_log2gran(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_addrbits(struct sbi_scratch *scratch);
bool sbi_hart_smepmp_is_fw_region(unsigned int pmp_idx);
int sbi_hart_pmp_init(struct sbi_scratch *scratch);
#endif