RISC-V: Add SBI HSM extension definitions

SBI specification defines HSM extension that allows to start/stop a hart
by a supervisor anytime. The specification is available at

https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc

Add those definitions here.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 2bbfd6b..653edb2 100644 (file)
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -26,6 +26,7 @@ enum sbi_ext_id {
        SBI_EXT_TIME = 0x54494D45,
        SBI_EXT_IPI = 0x735049,
        SBI_EXT_RFENCE = 0x52464E43,
+       SBI_EXT_HSM = 0x48534D,
 };
 
 enum sbi_ext_base_fid {
@@ -56,6 +57,19 @@ enum sbi_ext_rfence_fid {
        SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
 };
 
+enum sbi_ext_hsm_fid {
+       SBI_EXT_HSM_HART_START = 0,
+       SBI_EXT_HSM_HART_STOP,
+       SBI_EXT_HSM_HART_STATUS,
+};
+
+enum sbi_hsm_hart_status {
+       SBI_HSM_HART_STATUS_STARTED = 0,
+       SBI_HSM_HART_STATUS_STOPPED,
+       SBI_HSM_HART_STATUS_START_PENDING,
+       SBI_HSM_HART_STATUS_STOP_PENDING,
+};
+
 #define SBI_SPEC_VERSION_DEFAULT       0x1
 #define SBI_SPEC_VERSION_MAJOR_SHIFT   24
 #define SBI_SPEC_VERSION_MAJOR_MASK    0x7f