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lib: Provide a platform hook to implement vendor specific SBI extensions.

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SBI v0.2 specification allows vendor extensions and it should be
implemented in a independent of the core sbi library.

Introduce a single platform callback that will let platforms handle
all vendor extensions in platform specific code if they want.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2019-10-02 13:59:40 -07:00
committed by Anup Patel
parent 0790be0f2c
commit 30f09fbfd1
3 changed files with 86 additions and 3 deletions
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58
include/sbi/sbi_platform.h
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@@ -43,6 +43,8 @@
#include <sbi/sbi_version.h>
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_error.h>
/** Possible feature flags of a platform */
enum sbi_platform_features {
@@ -112,6 +114,14 @@ struct sbi_platform_operations {
int (*system_reboot)(u32 type);
/** Shutdown or poweroff the platform */
int (*system_shutdown)(u32 type);
/** platform specific SBI extension implementation probe function */
int (*vendor_ext_check)(long extid);
/** platform specific SBI extension implementation provider */
int (*vendor_ext_provider)(long extid, long funcid,
unsigned long *args, unsigned long *out_value,
unsigned long *out_trap_cause,
unsigned long *out_trap_val);
} __packed;
/** Representation of a platform */
@@ -506,6 +516,54 @@ static inline int sbi_platform_system_shutdown(const struct sbi_platform *plat,
return 0;
}
/**
* Check if a vendor extension is implemented or not.
*
* @param plat pointer to struct sbi_platform
* @param extid vendor SBI extension id
*
* @return 0 if extid is not implemented and 1 if implemented
*/
static inline int sbi_platform_vendor_ext_check(const struct sbi_platform *plat,
long extid)
{
if (plat && sbi_platform_ops(plat)->vendor_ext_check)
return sbi_platform_ops(plat)->vendor_ext_check(extid);
return 0;
}
/**
* Invoke platform specific vendor SBI extension implementation.
*
* @param plat pointer to struct sbi_platform
* @param extid vendor SBI extension id
* @param funcid SBI function id within the extension id
* @param args pointer to arguments passed by the caller
* @param out_value output value that can be filled the callee
* @param out_tcause trap cause that can be filled the callee
* @param out_tvalue possible trap value that can be filled the callee
*
* @return 0 on success and negative error code on failure
*/
static inline int sbi_platform_vendor_ext_provider(const struct sbi_platform *plat,
long extid, long funcid,
unsigned long *args,
unsigned long *out_value,
unsigned long *out_tcause,
unsigned long *out_tval)
{
if (plat && sbi_platform_ops(plat)->vendor_ext_provider) {
return sbi_platform_ops(plat)->vendor_ext_provider(extid,
funcid, args,
out_value,
out_tcause,
out_tval);
}
return SBI_ENOTSUPP;
}
#endif
#endif