102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
#include "syscall/syscall.h"
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#include <stdint.h>
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#include "common/msr.h"
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#include "debug/debug.h"
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#include "scheduler/scheduler.h"
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#include "syscall/address_space.h"
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#include "syscall/capability.h"
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#include "syscall/debug.h"
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#include "syscall/ipc.h"
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#include "syscall/memory_object.h"
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#include "syscall/process.h"
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#include "syscall/synchronization.h"
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#include "syscall/thread.h"
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#define EFER 0xC0000080
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#define STAR 0xC0000081
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#define LSTAR 0xC0000082
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extern "C" void syscall_enter();
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// Used by syscall_enter.s
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extern "C" uint64_t GetKernelRsp() {
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return gScheduler->CurrentThread()->Rsp0Start();
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}
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void InitSyscall() {
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uint64_t efer_val = GetMSR(EFER);
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efer_val |= 1;
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SetMSR(EFER, efer_val);
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if (GetMSR(EFER) != efer_val) {
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panic("Failed to set EFER MSR");
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}
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uint64_t star_val = GetMSR(STAR);
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uint64_t kernel_cs = 0x8;
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// Due to the ability to jump from a 64 bit kernel into compatibility mode,
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// this will actually use CS 0x20 (and SS 0x18).
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// See AMD Manual 3.4 instruction SYSRET for more info.
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uint64_t user_cs = 0x18;
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star_val |= (kernel_cs << 32) | (user_cs << 48);
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SetMSR(STAR, star_val);
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SetMSR(LSTAR, reinterpret_cast<uint64_t>(syscall_enter));
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}
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#define CASE(name) \
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case kZion##name: \
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return name(reinterpret_cast<Z##name##Req*>(req));
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extern "C" z_err_t SyscallHandler(uint64_t call_id, void* req) {
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switch (call_id) {
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// syscall/process.h
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CASE(ProcessExit);
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CASE(ProcessSpawn);
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// syscall/thread.h
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CASE(ThreadCreate);
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CASE(ThreadStart);
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CASE(ThreadExit);
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CASE(ThreadWait);
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// syscall/address_space.h
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CASE(AddressSpaceMap);
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CASE(AddressSpaceUnmap);
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// syscall/memory_object.h
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CASE(MemoryObjectCreate);
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CASE(MemoryObjectCreatePhysical);
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CASE(MemoryObjectCreateContiguous);
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CASE(MemoryObjectDuplicate);
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CASE(MemoryObjectInspect);
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// syscall/ipc.h
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CASE(ChannelCreate);
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CASE(ChannelSend);
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CASE(ChannelRecv);
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CASE(PortCreate);
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CASE(PortSend);
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CASE(PortRecv);
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CASE(PortPoll);
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CASE(IrqRegister);
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CASE(EndpointCreate);
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CASE(EndpointSend);
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CASE(EndpointRecv);
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CASE(ReplyPortSend);
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CASE(ReplyPortRecv);
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// syscall/capability.h
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CASE(CapDuplicate);
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CASE(CapRelease);
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// syscall/syncronization.h
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CASE(MutexCreate);
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CASE(MutexLock);
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CASE(MutexRelease);
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CASE(SemaphoreCreate);
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CASE(SemaphoreWait);
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CASE(SemaphoreSignal);
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// syscall/debug.h
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CASE(Debug);
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default:
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dbgln("Unhandled syscall number: {x}", call_id);
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return glcr::UNIMPLEMENTED;
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}
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UNREACHABLE
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}
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