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This commit is contained in:
Nicholas Orlowsky 2025-02-28 21:25:17 -05:00
parent ce2b373313
commit 9114529153
46 changed files with 126016 additions and 125522 deletions
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145
kernel/syscall.c
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@ -1,145 +0,0 @@
#pragma once
#include "scheduler.c"
#include "ps2.c"
#include "pci.c"
#include "vga.c"
#ifdef ARCH_I386
#include "../arch/i386/syscall.c"
#endif
enum syscall_type_d { SYSCALL_yield, SYSCALL_getc, SYSCALL_exit, SYSCALL_lspci, SYSCALL_lsproc };
void yield() { INVOKE_SYSCALL(SYSCALL_yield); }
char getc() {
INVOKE_SYSCALL(SYSCALL_getc);
char result;
__asm__ volatile (
"movb %%al, %0"
: "=r"(result)
);
return result;
}
uint32_t lspci(struct pci_device* devlist, uint32_t len) {
int result = 0;
__asm__ volatile (
"movl %0, %%ebx"
: : "r"((uint32_t) devlist) : "%ebx"
);
__asm__ volatile (
"movl %0, %%ecx"
: : "r"(len) : "%ecx"
);
INVOKE_SYSCALL(SYSCALL_lspci);
__asm__ volatile (
"movl %%eax, %k0"
: "=r"(result)
);
return result;
}
uint32_t lsproc(struct task_struct* proclist, uint32_t len) {
int result = 0;
__asm__ volatile (
"movl %0, %%ebx"
: : "r"((uint32_t) proclist) : "%ebx"
);
__asm__ volatile (
"movl %0, %%ecx"
: : "r"(len) : "%ecx"
);
INVOKE_SYSCALL(SYSCALL_lsproc);
__asm__ volatile (
"movl %%eax, %k0"
: "=r"(result)
);
return result;
}
void __syscall_yield(struct regs *r) {
// for now, just reschedule
// TODO: reset PIT timer so
// next process doesn't get an
// unreasonably small quantum
schedule(r);
}
void syscall(struct regs *r) {
int syscall_no = r->eax;
switch (syscall_no) {
case SYSCALL_yield: {
__syscall_yield(r);
break;
};
case SYSCALL_getc: {
process_table[current_pid].state = TASKSTATE_blocked;
for(uint32_t i = 0; i < MAX_PROCESSES; i++) {
if(!ps2_waiters[i].alloc) {
ps2_waiters[i].alloc = 1;
ps2_waiters[i].pid = current_pid;
break;
}
}
__syscall_yield(r);
break;
};
case SYSCALL_lspci: {
uint32_t len = r->ecx;
len = len < pci_devices_count ? len : pci_devices_count;
struct pci_device* devlist = (struct pci_device*) r->ebx;
for (uint32_t i = 0; i < len; ++i) {
devlist[i] = pci_devices_list[i];
}
r->eax = len;
break;
};
case SYSCALL_lsproc: {
uint32_t len = r->ecx;
struct task_struct*proclist = (struct task_struct*) r->ebx;
uint32_t i = 0, j = 0;
for (; i < len; ++i, ++j) {
for(; j < MAX_PROCESSES && process_table[j].state == TASKSTATE_unused; ++j) {}
if (j == MAX_PROCESSES) break;
proclist[i] = process_table[j];
}
r->eax = i;
break;
};
case SYSCALL_exit: {
process_table[current_pid].state = TASKSTATE_unused;
__syscall_yield(r);
break;
};
}
}