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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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2
include/sbi/sbi_ecall_interface.h
View file

@ -38,6 +38,8 @@ enum sbi_ext_base_fid {
#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
#define SBI_EXT_VENDOR_START 0x09000000
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
#endif

58
include/sbi/sbi_platform.h
View file

@ -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

29
lib/sbi/sbi_ecall.c
View file

@ -12,6 +12,7 @@
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_tlb.h>
@ -47,14 +48,30 @@ int sbi_check_extension(struct sbi_scratch *scratch, unsigned long extid,
*/
if ((extid >= SBI_EXT_0_1_SET_TIMER &&
extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE))
extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE)) {
*out_val = 1;
else
} else if (extid >= SBI_EXT_VENDOR_START &&
extid <= SBI_EXT_VENDOR_END) {
*out_val = sbi_platform_vendor_ext_check(
sbi_platform_ptr(scratch),
extid);
} else
*out_val = 0;
return 0;
}
int sbi_ecall_vendor_ext_handler(struct sbi_scratch *scratch,
unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
unsigned long *out_tcause,
unsigned long *out_tval)
{
return sbi_platform_vendor_ext_provider(sbi_platform_ptr(scratch),
extid, funcid, args, out_val,
out_tcause, out_tval);
}
int sbi_ecall_base_handler(struct sbi_scratch *scratch, unsigned long extid,
unsigned long funcid, unsigned long *args,
unsigned long *out_val, unsigned long *out_tcause,
@ -195,8 +212,14 @@ int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
ret = sbi_ecall_base_handler(scratch, extension_id, func_id,
args, &out_val,
&out_tval, &out_tcause);
else
else if (extension_id >= SBI_EXT_VENDOR_START &&
extension_id <= SBI_EXT_VENDOR_END) {
ret = sbi_ecall_vendor_ext_handler(scratch, extension_id,
func_id, args, &out_val,
&out_tval, &out_tcause);
} else {
ret = SBI_ENOTSUPP;
}
if (ret == SBI_ETRAP) {
sbi_trap_redirect(regs, scratch, regs->mepc,