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Kernel/riscv64: Add support for SRST "System Reset" SBI extension

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This extension will be used for rebooting and shutting down.
This commit is contained in:
Sönke Holz 2024-01-04 18:18:34 +01:00 • committed by Andrew Kaster
parent cac7dc8d71
commit 27087318bc
2 changed files with 58 additions and 0 deletions
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30
Kernel/Arch/riscv64/SBI.cpp
View file

@ -44,6 +44,22 @@ static SBIErrorOr<long> sbi_ecall1(EID extension_id, u32 function_id, unsigned l
return static_cast<SBIError>(a0);
}
static SBIErrorOr<long> sbi_ecall2(EID extension_id, u32 function_id, unsigned long arg0, unsigned long arg1)
{
register unsigned long a0 asm("a0") = arg0;
register unsigned long a1 asm("a1") = arg1;
register unsigned long a6 asm("a6") = function_id;
register unsigned long a7 asm("a7") = to_underlying(extension_id);
asm volatile("ecall"
: "+r"(a0), "+r"(a1)
: "r"(a0), "r"(a1), "r"(a6), "r"(a7)
: "memory");
if (a0 == to_underlying(SBIError::Success))
return static_cast<long>(a1);
return static_cast<SBIError>(a0);
}
namespace Base {
SBIErrorOr<SpecificationVersion> get_spec_version()
@ -145,6 +161,20 @@ SBIErrorOr<void> set_timer(u64 stime_value)
}
namespace SystemReset {
SBIError system_reset(ResetType reset_type, ResetReason reset_reason)
{
auto const res = SBI::sbi_ecall2(EID::SystemReset, to_underlying(FID::SystemReset), to_underlying(reset_type), to_underlying(reset_reason));
// This SBI call shold only return if it didn't succeed
VERIFY(res.is_error());
return res.error();
}
}
namespace DBCN {
SBIErrorOr<void> debug_console_write_byte(u8 byte)

28
Kernel/Arch/riscv64/SBI.h
View file

@ -46,6 +46,8 @@ enum class EID : i32 {
Base = 0x10,
// Debug Console Extension ("DBCN")
DebugConsole = 0x4442434E,
// System Reset Extension ("SRST")
SystemReset = 0x53525354,
// Timer Extension ("TIME")
Timer = 0x54494D45,
};
@ -155,6 +157,32 @@ SBIErrorOr<void> set_timer(u64 stime_value);
}
// Chapter 10. System Reset Extension (EID #0x53525354 "SRST")
// Since SBI v0.2
namespace SystemReset {
enum class FID : i32 {
SystemReset = 0,
};
enum class ResetType : u32 {
Shutdown = 0x0,
ColdReboot = 0x1,
WarmReboot = 0x2,
};
enum class ResetReason : u32 {
NoReason = 0x0,
SystemFailure = 0x1,
};
// System reset (FID #0)
// Reset the system based on provided reset_type and reset_reason. This is a synchronous call and
// does not return if it succeeds.
SBIError system_reset(ResetType reset_type, ResetReason reset_reason);
}
// Chapter 12. Debug Console Extension (EID #0x4442434E "DBCN")
// Since SBI v2.0
namespace DBCN {