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Add syscall.c|h|asm in kernel/ke (2)

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This commit is contained in:
Adrien Bourmault 2021-02-26 18:04:39 +01:00
parent 281ec9c5f5
commit bc3e8323bd
Signed by: neox
GPG Key ID: 6EB408FE0ACEC664
3 changed files with 133 additions and 0 deletions
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40
include/kernel/ke/syscall.h Normal file
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//----------------------------------------------------------------------------//
// OS on Kaleid //
// //
// Desc: System call & userspace related functions //
// //
// //
// Copyright © 2018-2021 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#ifndef _KERNEL_H
#include <kernel.h>
#endif
#ifndef _KALKERN_SYSCALL_H
#define _KALKERN_SYSCALL_H
//----------------------------------------------------------------------------//
extern void KeJumpToUserspace(ulong args, void *entryPoint, void *stackAddr);
void KeEnableSystemCalls();
//----------------------------------------------------------------------------//
#endif

50
kaleid/kernel/ke/syscall.asm Normal file
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;=----------------------------------------------------------------------------=;
; OS on Kaleid ;
; ;
; Desc: System call & userspace related functions ;
; ;
; ;
; Copyright © 2018-2021 The OS/K Team ;
; ;
; This file is part of OS/K. ;
; ;
; OS/K is free software: you can redistribute it and/or modify ;
; it under the terms of the GNU General Public License as published by ;
; the Free Software Foundation, either version 3 of the License, or ;
; (at your option) any later version. ;
; ;
; OS/K is distributed in the hope that it will be useful, ;
; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
; GNU General Public License for more details. ;
; ;
; You should have received a copy of the GNU General Public License ;
; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
;=----------------------------------------------------------------------------=;
[BITS 64]
%include "kaleid/kernel/ke/cpuf.inc"
global KeJumpToUserspace
KeJumpToUserspace:
# rdi = user args
# rsi = entry point in user space
# rdx = user space stack
mov rax, 0x1b ; Selector 0x18 (User Data) + RPL 3
mov ds, ax
mov es, ax
# Build a fake iret frame
push rax # Selector 0x18 (User Data) + RPL 3
push rdx # User space stack
push 0x202 # rflags = interrupt enable + reserved bit
push 0x23 # Selector 0x20 (User Code) + RPL 3
push rsi # Entry point in user space
xor rax, rax
iretq

43
kaleid/kernel/ke/syscall.c Normal file
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//----------------------------------------------------------------------------//
// OS on Kaleid //
// //
// Desc: System call & userspace related functions //
// //
// //
// Copyright © 2018-2021 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <libbuf.h>
#include <init/boot.h>
#include <ke/idt.h>
#include <io/vga.h>
static uchar SyscallHandler(ISRFrame_t *regs)
{
DebugLog("Got a system call code %d !\n", regs->rdi);
return EOK;
}
void KeEnableSystemCalls()
{
ulong flags = KePauseIRQs();
KeRegisterISR(SyscallHandler, 0x80);
KeRestoreIRQs(flags);
KeEnableNMI();
}