lib: sbi: add support for firmware features extension

This extension allows the software running in supervisor mode to control
the behavior of various features of the SBI [1]. Implement the support
for such extension.

Link: https://lists.riscv.org/g/tech-prs/message/924 [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger
2024-06-19 11:42:39 +02:00
committed by Anup Patel
parent 53844c98d0
commit aa5a859369
5 changed files with 240 additions and 0 deletions

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@@ -34,6 +34,7 @@
#define SBI_EXT_CPPC 0x43505043
#define SBI_EXT_DBTR 0x44425452
#define SBI_EXT_SSE 0x535345
#define SBI_EXT_FWFT 0x46574654
/* SBI function IDs for BASE extension*/
#define SBI_EXT_BASE_GET_SPEC_VERSION 0x0
@@ -117,6 +118,32 @@
#define SBI_EXT_DBTR_TRIGGER_ENABLE 0x6
#define SBI_EXT_DBTR_TRIGGER_DISABLE 0x7
/* SBI function IDs for FW feature extension */
#define SBI_EXT_FWFT_SET 0x0
#define SBI_EXT_FWFT_GET 0x1
enum sbi_fwft_feature_t {
SBI_FWFT_MISALIGNED_EXC_DELEG = 0x0,
SBI_FWFT_LANDING_PAD = 0x1,
SBI_FWFT_SHADOW_STACK = 0x2,
SBI_FWFT_DOUBLE_TRAP = 0x3,
SBI_FWFT_PTE_AD_HW_UPDATING = 0x4,
SBI_FWFT_LOCAL_RESERVED_START = 0x5,
SBI_FWFT_LOCAL_RESERVED_END = 0x3fffffff,
SBI_FWFT_LOCAL_PLATFORM_START = 0x40000000,
SBI_FWFT_LOCAL_PLATFORM_END = 0x7fffffff,
SBI_FWFT_GLOBAL_RESERVED_START = 0x80000000,
SBI_FWFT_GLOBAL_RESERVED_END = 0xbfffffff,
SBI_FWFT_GLOBAL_PLATFORM_START = 0xc0000000,
SBI_FWFT_GLOBAL_PLATFORM_END = 0xffffffff,
};
#define SBI_FWFT_GLOBAL_FEATURE_BIT (1 << 31)
#define SBI_FWFT_PLATFORM_FEATURE_BIT (1 << 30)
#define SBI_FWFT_SET_FLAG_LOCK (1 << 0)
/** General pmu event codes specified in SBI PMU extension */
enum sbi_pmu_hw_generic_events_t {
SBI_PMU_HW_NO_EVENT = 0,

23
include/sbi/sbi_fwft.h Normal file
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@@ -0,0 +1,23 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Rivos Inc.
*
* Authors:
* Clément Léger <cleger@rivosinc.com>
*/
#ifndef __SBI_FW_FEATURE_H__
#define __SBI_FW_FEATURE_H__
#include <sbi/sbi_ecall_interface.h>
struct sbi_scratch;
int sbi_fwft_set(enum sbi_fwft_feature_t feature, unsigned long value,
unsigned long flags);
int sbi_fwft_get(enum sbi_fwft_feature_t feature, unsigned long *out_val);
int sbi_fwft_init(struct sbi_scratch *scratch, bool cold_boot);
#endif