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lib: Add dynamic registration of SBI extensions

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This patch extends our SBI ecall implementation to allow
dynamic registration of various SBI extensions. Using this
dynamic registration we can break-up SBI ecall implementation
into multiple files and even register experimental/custom
SBI extensions from platform code.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-01-16 11:38:49 +05:30
committed by Anup Patel
parent 0a411bf717
commit 37923c4a66
3 changed files with 199 additions and 65 deletions
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22
include/sbi/sbi_ecall.h
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@@ -11,15 +11,37 @@
#define __SBI_ECALL_H__
#include <sbi/sbi_types.h>
#include <sbi/sbi_list.h>
struct sbi_trap_regs;
struct sbi_trap_info;
struct sbi_scratch;
struct sbi_ecall_extension {
struct sbi_dlist head;
unsigned long extid_start;
unsigned long extid_end;
int (* probe)(struct sbi_scratch *scratch,
unsigned long extid, unsigned long *out_val);
int (* handle)(struct sbi_scratch *scratch,
unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
struct sbi_trap_info *out_trap);
};
u16 sbi_ecall_version_major(void);
u16 sbi_ecall_version_minor(void);
struct sbi_ecall_extension *sbi_ecall_find_extension(unsigned long extid);
int sbi_ecall_register_extension(struct sbi_ecall_extension *ext);
void sbi_ecall_unregister_extension(struct sbi_ecall_extension *ext);
int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch);
int sbi_ecall_init(void);
#endif