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Import the "gerbert" kernel I worked on earlier this year.

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It's a lot crappier than I remembered it. It's gonna need a lot of work.
This commit is contained in:
Andreas Kling 2018-10-16 11:01:38 +02:00
parent f608629704
commit 9396108034
55 changed files with 4600 additions and 0 deletions
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144
Kernel/Syscall.cpp Normal file
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#include "i386.h"
#include "VGA.h"
#include "Task.h"
#include "Syscall.h"
struct RegisterDump {
WORD gs;
WORD fs;
WORD es;
WORD ds;
DWORD edi;
DWORD esi;
DWORD ebp;
DWORD esp;
DWORD ebx;
DWORD edx;
DWORD ecx;
DWORD eax;
DWORD eip;
WORD cs;
WORD __csPadding;
DWORD eflags;
} PACKED;
extern "C" void syscall_entry();
extern "C" void syscall_ISR();
extern volatile RegisterDump* syscallRegDump;
asm(
".globl syscall_ISR \n"
".globl syscallRegDump \n"
"syscallRegDump: \n"
".long 0\n"
"syscall_ISR:\n"
" pusha\n"
" pushw %ds\n"
" pushw %es\n"
" pushw %fs\n"
" pushw %gs\n"
" pushw %ss\n"
" pushw %ss\n"
" pushw %ss\n"
" pushw %ss\n"
" popw %ds\n"
" popw %es\n"
" popw %fs\n"
" popw %gs\n"
" mov %esp, syscallRegDump\n"
" call syscall_entry\n"
" popw %gs\n"
" popw %fs\n"
" popw %es\n"
" popw %ds\n"
" popa\n"
" iret\n"
);
namespace Syscall {
void initialize()
{
registerUserCallableInterruptHandler(0x80, syscall_ISR);
kprintf("syscall: int 0x80 handler installed\n");
}
DWORD invoke(DWORD function)
{
DWORD result;
asm("int $0x80":"=a"(result):"a"(function));
return result;
}
DWORD invoke(DWORD function, DWORD arg1)
{
DWORD result;
asm("int $0x80":"=a"(result):"a"(function),"d"(arg1));
return result;
}
DWORD invoke(DWORD function, DWORD arg1, DWORD arg2)
{
DWORD result;
asm("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2));
return result;
}
DWORD invoke(DWORD function, DWORD arg1, DWORD arg2, DWORD arg3)
{
DWORD result;
asm volatile("int $0x80":"=a"(result):"a"(function),"d"(arg1),"c"(arg2),"b"(arg3));
return result;
}
DWORD handle(DWORD function, DWORD arg1, DWORD arg2, DWORD arg3)
{
switch (function) {
case Syscall::Yield:
yield();
break;
case 0x1235: // putch
kprintf( "%c", arg1 & 0xFF );
break;
case Syscall::Sleep:
kprintf("syscall: sleep(%d)\n", arg1);
current->sys$sleep(arg1);
break;
case Syscall::PosixOpen:
Task::checkSanity("syscall");
kprintf("syscall: open('%s', %u)\n", arg1, arg2);
return current->sys$open((const char*)arg1, (size_t)arg2);
case Syscall::PosixClose:
kprintf("syscall: close(%d)\n", arg1);
return current->sys$close((int)arg1);
case Syscall::PosixRead:
kprintf("syscall: read(%d, %p, %u)\n", arg1, arg2, arg3);
return current->sys$read((int)arg1, (void*)arg2, (size_t)arg3);
case Syscall::PosixSeek:
// FIXME: This has the wrong signature, should be like lseek()
kprintf("syscall: seek(%d, %p, %u)\n", arg1, arg2, arg3);
return current->sys$read((int)arg1, (void*)arg2, (size_t)arg3);
case Syscall::PosixKill:
kprintf("syscall: kill(%d, %d)\n", arg1, arg2);
return current->sys$kill((pid_t)arg1, (int)arg2);
case Syscall::PosixGetuid:
return current->sys$getuid();
default:
kprintf("int0x80: Unknown function %x requested {%x, %x, %x}\n", function, arg1, arg2, arg3);
break;
}
return 0;
}
}
void syscall_entry()
{
auto& regs = *syscallRegDump;
DWORD function = regs.eax;
DWORD arg1 = regs.edx;
DWORD arg2 = regs.ecx;
DWORD arg3 = regs.ebx;
regs.eax = Syscall::handle(function, arg1, arg2, arg3);
}