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include: sbi: add emulate_load/store handler to platform ops

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This patch allows the platform to define load/store emulators. This
enables a platform to trap-and-emulate special devices or filter
access to existing physical devices.

Signed-off-by: Bo Gan <ganboing@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bo Gan 2024-03-05 18:35:39 -08:00 • committed by Anup Patel
parent 4c112650bb
commit ddf3b649f1
1 changed files with 8 additions and 0 deletions
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8
include/sbi/sbi_platform.h
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@ -53,6 +53,7 @@ struct sbi_domain_memregion;
struct sbi_ecall_return; struct sbi_ecall_return;
struct sbi_trap_regs; struct sbi_trap_regs;
struct sbi_hart_features; struct sbi_hart_features;
union sbi_ldst_data;
/** Possible feature flags of a platform */ /** Possible feature flags of a platform */
enum sbi_platform_features { enum sbi_platform_features {
@ -139,6 +140,13 @@ struct sbi_platform_operations {
int (*vendor_ext_provider)(long funcid, int (*vendor_ext_provider)(long funcid,
struct sbi_trap_regs *regs, struct sbi_trap_regs *regs,
struct sbi_ecall_return *out); struct sbi_ecall_return *out);
/** platform specific handler to fixup load fault */
int (*emulate_load)(int rlen, unsigned long addr,
union sbi_ldst_data *out_val);
/** platform specific handler to fixup store fault */
int (*emulate_store)(int wlen, unsigned long addr,
union sbi_ldst_data in_val);
}; };
/** Platform default per-HART stack size for exception/interrupt handling */ /** Platform default per-HART stack size for exception/interrupt handling */