forked from Mirrors/opensbi
3a94a32580
Save/restore sbi_trap_context during domain context switching to
ensure proper trap handling and isolation. This maintains correct
domain-specific state, avoiding context corruption.
Fixes: abea949721 ("lib: sbi: Introduce trap context")
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Tested-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Yong Li <yong.li@intel.com>
Tested-by: Yong Li <yong.li@intel.com>
78 lines
2.3 KiB
C
Executable File
78 lines
2.3 KiB
C
Executable File
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) IPADS@SJTU 2023. All rights reserved.
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*/
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#ifndef __SBI_DOMAIN_CONTEXT_H__
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#define __SBI_DOMAIN_CONTEXT_H__
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_domain.h>
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/** Context representation for a hart within a domain */
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struct sbi_context {
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/** Trap-related states such as GPRs, mepc, and mstatus */
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struct sbi_trap_context trap_ctx;
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/** Supervisor status register */
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unsigned long sstatus;
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/** Supervisor interrupt enable register */
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unsigned long sie;
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/** Supervisor trap vector base address register */
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unsigned long stvec;
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/** Supervisor scratch register for temporary storage */
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unsigned long sscratch;
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/** Supervisor exception program counter register */
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unsigned long sepc;
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/** Supervisor cause register */
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unsigned long scause;
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/** Supervisor trap value register */
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unsigned long stval;
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/** Supervisor interrupt pending register */
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unsigned long sip;
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/** Supervisor address translation and protection register */
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unsigned long satp;
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/** Counter-enable register */
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unsigned long scounteren;
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/** Supervisor environment configuration register */
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unsigned long senvcfg;
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/** Reference to the owning domain */
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struct sbi_domain *dom;
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/** Previous context (caller) to jump to during context exits */
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struct sbi_context *prev_ctx;
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/** Is context initialized and runnable */
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bool initialized;
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};
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/** Get the context pointer for a given hart index and domain */
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#define sbi_hartindex_to_domain_context(__hartindex, __d) \
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(__d)->hartindex_to_context_table[__hartindex]
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/** Macro to obtain the current hart's context pointer */
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#define sbi_domain_context_thishart_ptr() \
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sbi_hartindex_to_domain_context( \
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sbi_hartid_to_hartindex(current_hartid()), \
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sbi_domain_thishart_ptr())
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/**
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* Enter a specific domain context synchronously
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* @param dom pointer to domain
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*
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* @return 0 on success and negative error code on failure
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*/
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int sbi_domain_context_enter(struct sbi_domain *dom);
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/**
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* Exit the current domain context, and then return to the caller
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* of sbi_domain_context_enter or attempt to start the next domain
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* context to be initialized
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*
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* @return 0 on success and negative error code on failure
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*/
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int sbi_domain_context_exit(void);
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#endif // __SBI_DOMAIN_CONTEXT_H__
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