diff options
| author | Atish Patra <atish.patra@wdc.com> | 2020-02-11 17:32:39 -0800 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-02-24 18:13:23 +0530 |
| commit | e3f69fc1e934ce7815d9cde2d13dd2038a2894a6 (patch) | |
| tree | 12a3d9846f29bcda30c622efa2368d70d51752f3 /lib/sbi | |
| parent | 5b4824082ff8826f77d6bc670e16068d0744ff7f (diff) | |
lib: Implement Hart State Management (HSM) SBI extension
This patch adds support HSM extension. The specification is available
at https://github.com/riscv/riscv-sbi-doc.
It allows to implement hart hotplug and fixed ordered hart booting in
supervisor.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Diffstat (limited to 'lib/sbi')
| -rw-r--r-- | lib/sbi/objects.mk | 1 | ||||
| -rw-r--r-- | lib/sbi/sbi_ecall.c | 3 | ||||
| -rw-r--r-- | lib/sbi/sbi_ecall_hsm.c | 51 |
3 files changed, 55 insertions, 0 deletions
diff --git a/lib/sbi/objects.mk b/lib/sbi/objects.mk index dc52a9f..39e9295 100644 --- a/lib/sbi/objects.mk +++ b/lib/sbi/objects.mk @@ -18,6 +18,7 @@ libsbi-objs-y += sbi_ecall_base.o libsbi-objs-y += sbi_ecall_legacy.o libsbi-objs-y += sbi_ecall_replace.o libsbi-objs-y += sbi_ecall_vendor.o +libsbi-objs-y += sbi_ecall_hsm.o libsbi-objs-y += sbi_emulate_csr.o libsbi-objs-y += sbi_fifo.o libsbi-objs-y += sbi_hfence.o diff --git a/lib/sbi/sbi_ecall.c b/lib/sbi/sbi_ecall.c index 82397c4..2383e4f 100644 --- a/lib/sbi/sbi_ecall.c +++ b/lib/sbi/sbi_ecall.c @@ -138,6 +138,9 @@ int sbi_ecall_init(void) ret = sbi_ecall_register_extension(&ecall_base); if (ret) return ret; + ret = sbi_ecall_register_extension(&ecall_hsm); + if (ret) + return ret; ret = sbi_ecall_register_extension(&ecall_legacy); if (ret) return ret; diff --git a/lib/sbi/sbi_ecall_hsm.c b/lib/sbi/sbi_ecall_hsm.c new file mode 100644 index 0000000..528bc80 --- /dev/null +++ b/lib/sbi/sbi_ecall_hsm.c @@ -0,0 +1,51 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2020 Western Digital Corporation or its affiliates. + * + * Authors: + * Atish Patra <atish.patra@wdc.com> + */ + +#include <sbi/sbi_ecall.h> +#include <sbi/sbi_ecall_interface.h> +#include <sbi/sbi_error.h> +#include <sbi/sbi_version.h> +#include <sbi/sbi_hsm.h> +#include <sbi/riscv_asm.h> + +static int sbi_ecall_hsm_handler(struct sbi_scratch *scratch, + unsigned long extid, unsigned long funcid, + unsigned long *args, unsigned long *out_val, + struct sbi_trap_info *out_trap) +{ + int ret = 0; + int hstate; + + switch (funcid) { + case SBI_EXT_HSM_HART_START: + ret = sbi_hsm_hart_start(scratch, args[0], args[1], args[2]); + break; + case SBI_EXT_HSM_HART_STOP: + ret = sbi_hsm_hart_stop(scratch, TRUE); + break; + case SBI_EXT_HSM_HART_GET_STATUS: + hstate = sbi_hsm_hart_get_state(scratch, args[0]); + ret = sbi_hsm_hart_state_to_status(hstate); + break; + default: + ret = SBI_ENOTSUPP; + }; + if (ret >= 0) { + *out_val = ret; + ret = 0; + } + + return ret; +} + +struct sbi_ecall_extension ecall_hsm = { + .extid_start = SBI_EXT_HSM, + .extid_end = SBI_EXT_HSM, + .handle = sbi_ecall_hsm_handler, +}; |