RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 23:57:34 +00:00
Code Issues Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

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)