Unverified Commit cf8651f7 authored by Clément Léger's avatar Clément Léger Committed by Palmer Dabbelt
Browse files

riscv: sbi: add Firmware Feature (FWFT) SBI extensions definitions 



The Firmware Features extension (FWFT) was added as part of the SBI 3.0
specification. Add SBI definitions to use this extension.

Signed-off-by: default avatarClément Léger <cleger@rivosinc.com>
Reviewed-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Tested-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Reviewed-by: default avatarDeepak Gupta <debug@rivosinc.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Reviewed-by: default avatarAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-2-cleger@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@dabbelt.com>
parent 82f2b0b9

arch/riscv/include/asm/sbi.h

+33 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ enum sbi_ext_id { 
	SBI_EXT_DBCN = 0x4442434E,

	SBI_EXT_STA = 0x535441,

	SBI_EXT_NACL = 0x4E41434C,

	SBI_EXT_FWFT = 0x46574654,



	/* Experimentals extensions must lie within this range */

	SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@@ -402,6 +403,33 @@ enum sbi_ext_nacl_feature { 
#define SBI_NACL_SHMEM_SRET_X(__i)		((__riscv_xlen / 8) * (__i))

#define SBI_NACL_SHMEM_SRET_X_LAST		31



/* SBI function IDs for FW feature extension */

#define SBI_EXT_FWFT_SET		0x0

#define SBI_EXT_FWFT_GET		0x1



enum sbi_fwft_feature_t {

	SBI_FWFT_MISALIGNED_EXC_DELEG		= 0x0,

	SBI_FWFT_LANDING_PAD			= 0x1,

	SBI_FWFT_SHADOW_STACK			= 0x2,

	SBI_FWFT_DOUBLE_TRAP			= 0x3,

	SBI_FWFT_PTE_AD_HW_UPDATING		= 0x4,

	SBI_FWFT_POINTER_MASKING_PMLEN		= 0x5,

	SBI_FWFT_LOCAL_RESERVED_START		= 0x6,

	SBI_FWFT_LOCAL_RESERVED_END		= 0x3fffffff,

	SBI_FWFT_LOCAL_PLATFORM_START		= 0x40000000,

	SBI_FWFT_LOCAL_PLATFORM_END		= 0x7fffffff,



	SBI_FWFT_GLOBAL_RESERVED_START		= 0x80000000,

	SBI_FWFT_GLOBAL_RESERVED_END		= 0xbfffffff,

	SBI_FWFT_GLOBAL_PLATFORM_START		= 0xc0000000,

	SBI_FWFT_GLOBAL_PLATFORM_END		= 0xffffffff,

};



#define SBI_FWFT_PLATFORM_FEATURE_BIT		BIT(30)

#define SBI_FWFT_GLOBAL_FEATURE_BIT		BIT(31)



#define SBI_FWFT_SET_FLAG_LOCK			BIT(0)



/* SBI spec version fields */

#define SBI_SPEC_VERSION_DEFAULT	0x1

#define SBI_SPEC_VERSION_MAJOR_SHIFT	24
@@ -419,6 +447,11 @@ enum sbi_ext_nacl_feature { 
#define SBI_ERR_ALREADY_STARTED -7

#define SBI_ERR_ALREADY_STOPPED -8

#define SBI_ERR_NO_SHMEM	-9

#define SBI_ERR_INVALID_STATE	-10

#define SBI_ERR_BAD_RANGE	-11

#define SBI_ERR_TIMEOUT		-12

#define SBI_ERR_IO		-13

#define SBI_ERR_DENIED_LOCKED	-14



extern unsigned long sbi_spec_version;

struct sbiret {