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// MIT License, Copyright (c) 2020 Marvin Borner
#include <drivers/cpu.h>
#include <drivers/int.h>
#include <drivers/timer.h>
#include <errno.h>
#include <fs.h>
#include <io.h>
#include <load.h>
#include <mem.h>
#include <mm.h>
#include <print.h>
#include <proc.h>
#include <str.h>
#include <sys.h>
#include <syscall.h>
static u32 syscall_handler(u32 esp)
{
struct int_frame_user *frame = (struct int_frame_user *)esp;
enum sys num = frame->eax;
#if DEBUG_SYSCALLS
printf("[SYSCALL] %d from %s\n", num, proc_current()->name);
#endif
switch (num) {
// Memory operations
case SYS_ALLOC: {
frame->eax = memory_sys_alloc(proc_current()->page_dir, frame->ebx,
(u32 *)frame->ecx, (u32 *)frame->edx, (u8)frame->esi);
break;
}
case SYS_FREE: {
frame->eax = memory_sys_free(proc_current()->page_dir, frame->ebx);
break;
}
case SYS_SHACCESS: {
frame->eax = memory_sys_shaccess(proc_current()->page_dir, frame->ebx,
(u32 *)frame->ecx, (u32 *)frame->edx);
break;
}
// File operations
case SYS_STAT: {
frame->eax = vfs_stat((char *)frame->ebx, (struct stat *)frame->ecx);
break;
}
case SYS_READ: {
frame->eax =
vfs_read((char *)frame->ebx, (void *)frame->ecx, frame->edx, frame->esi);
break;
}
case SYS_WRITE: {
frame->eax =
vfs_write((char *)frame->ebx, (void *)frame->ecx, frame->edx, frame->esi);
break;
}
// I/O operations
case SYS_IOPOLL: {
frame->eax = io_poll((void *)frame->ebx);
break;
}
case SYS_IOREAD: {
res ready = io_ready(frame->ebx);
if (ready == -EAGAIN) {
io_block(frame->ebx, proc_current());
} else if (ready != EOK) {
frame->eax = ready;
break;
}
frame->eax = io_read(frame->ebx, (void *)frame->ecx, frame->edx, frame->esi);
break;
}
case SYS_IOWRITE: {
frame->eax = io_write(frame->ebx, (void *)frame->ecx, frame->edx, frame->esi);
break;
}
case SYS_IOCONTROL: {
frame->eax = io_control(frame->ebx, frame->ecx, (void *)frame->edx,
(void *)frame->esi, (void *)frame->edi);
break;
}
// Process operations
case SYS_EXEC: {
char *path = (char *)frame->ebx;
struct proc *proc = proc_make(PROC_PRIV_NONE);
frame->eax = (u32)elf_load(path, proc);
if (frame->eax != EOK)
panic("NOT IMPLEMENTED\n"); // TODO: Implement exec path/etc verify
else
proc_yield();
break;
}
case SYS_EXIT: {
frame->eax = EOK;
proc_exit((s32)frame->ebx);
break;
}
case SYS_YIELD: {
frame->eax = EOK;
proc_yield();
break;
}
// System operations
case SYS_BOOT: { // TODO: Move
if (frame->ebx != SYS_BOOT_MAGIC) {
frame->eax = -EINVAL;
break;
}
if (!proc_super()) {
frame->eax = -EACCES;
}
switch (frame->ecx) {
case SYS_BOOT_REBOOT:
print("Rebooting...\n");
outb(0x64, 0xfe);
__asm__ volatile("cli\nud2");
break;
case SYS_BOOT_SHUTDOWN:
print("Shutting down...\n");
outw(0xB004, 0x2000);
outw(0x604, 0x2000);
outw(0x4004, 0x3400);
outb(0x64, 0xfe);
__asm__ volatile("cli\nud2");
break;
default:
frame->eax = -EINVAL;
}
break;
}
case SYS_MIN:
case SYS_MAX:
frame->eax = -EINVAL;
break;
default: {
frame->eax = -EINVAL;
printf("Unknown syscall %d!\n", num);
break;
}
}
return esp;
}
// Internal scheduler (=> yield) call
static u32 syscall_special_handler(u32 esp)
{
if (proc_current())
proc_reset_quantum(proc_current());
return scheduler(esp);
}
CLEAR void syscall_init(void)
{
int_special_handler_add(0, syscall_handler);
int_special_handler_add(1, syscall_special_handler);
}
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