diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-11-24 14:20:19 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-12-01 17:11:11 +0530 |
| commit | 548d03e577490f74af8b57706655e5d81c9b94a1 (patch) | |
| tree | f8854349e7f544d05886c38c18c320d0dafbc0da /lib/sbi | |
| parent | 5c429ae2133e1a82b81403146a3e38e2b4b8350e (diff) | |
lib: sbi: Implement System Reset (SRST) SBI extension
The SBI SRST extension has been accepted and merged in the latest
SBI v0.3-draft specification.
(Refer, https://github.com/riscv/riscv-sbi-doc)
It allows to S-mode software to request system shutdown, cold reboot,
and warm reboot.
This patch implements SBI SRST extension as a replacement of the
legacy sbi_shutdown() call of SBI v0.1 specification.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib/sbi')
| -rw-r--r-- | lib/sbi/sbi_ecall.c | 3 | ||||
| -rw-r--r-- | lib/sbi/sbi_ecall_replace.c | 60 |
2 files changed, 63 insertions, 0 deletions
diff --git a/lib/sbi/sbi_ecall.c b/lib/sbi/sbi_ecall.c index 64c9933..6d41cff 100644 --- a/lib/sbi/sbi_ecall.c +++ b/lib/sbi/sbi_ecall.c @@ -169,6 +169,9 @@ int sbi_ecall_init(void) ret = sbi_ecall_register_extension(&ecall_hsm); if (ret) return ret; + ret = sbi_ecall_register_extension(&ecall_srst); + if (ret) + return ret; ret = sbi_ecall_register_extension(&ecall_legacy); if (ret) return ret; diff --git a/lib/sbi/sbi_ecall_replace.c b/lib/sbi/sbi_ecall_replace.c index e460c30..d06dfa2 100644 --- a/lib/sbi/sbi_ecall_replace.c +++ b/lib/sbi/sbi_ecall_replace.c @@ -14,6 +14,7 @@ #include <sbi/sbi_error.h> #include <sbi/sbi_hart.h> #include <sbi/sbi_ipi.h> +#include <sbi/sbi_system.h> #include <sbi/sbi_timer.h> #include <sbi/sbi_tlb.h> @@ -127,3 +128,62 @@ struct sbi_ecall_extension ecall_ipi = { .extid_end = SBI_EXT_IPI, .handle = sbi_ecall_ipi_handler, }; + +static int sbi_ecall_srst_handler(unsigned long extid, unsigned long funcid, + unsigned long *args, unsigned long *out_val, + struct sbi_trap_info *out_trap) +{ + if (funcid == SBI_EXT_SRST_RESET) { + if ((((u32)-1U) <= ((u64)args[0])) || + (((u32)-1U) <= ((u64)args[1]))) + return SBI_EINVAL; + + switch (args[0]) { + case SBI_SRST_RESET_TYPE_SHUTDOWN: + case SBI_SRST_RESET_TYPE_COLD_REBOOT: + case SBI_SRST_RESET_TYPE_WARM_REBOOT: + break; + default: + return SBI_ENOTSUPP; + } + + switch (args[1]) { + case SBI_SRST_RESET_REASON_NONE: + case SBI_SRST_RESET_REASON_SYSFAIL: + break; + default: + return SBI_ENOTSUPP; + } + + if (sbi_system_reset_supported(args[0], args[1])) + sbi_system_reset(args[0], args[1]); + } + + return SBI_ENOTSUPP; +} + +static int sbi_ecall_srst_probe(unsigned long extid, unsigned long *out_val) +{ + u32 type, count = 0; + + /* + * At least one standard reset types should be supported by + * the platform for SBI SRST extension to be usable. + */ + + for (type = 0; type <= SBI_SRST_RESET_TYPE_LAST; type++) { + if (sbi_system_reset_supported(type, + SBI_SRST_RESET_REASON_NONE)) + count++; + } + + *out_val = (count) ? 1 : 0; + return 0; +} + +struct sbi_ecall_extension ecall_srst = { + .extid_start = SBI_EXT_SRST, + .extid_end = SBI_EXT_SRST, + .handle = sbi_ecall_srst_handler, + .probe = sbi_ecall_srst_probe, +}; |