65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
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#pragma once
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#include "scheduler.c"
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#include "ps2.c"
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#ifdef ARCH_I386
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#include "../arch/i386/syscall.c"
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#endif
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enum syscall_type_d { SYSCALL_yield, SYSCALL_getc, SYSCALL_exit };
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void yield() { INVOKE_SYSCALL(SYSCALL_yield); }
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char getc() {
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INVOKE_SYSCALL(SYSCALL_getc);
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char result;
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__asm__ volatile (
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"movb %%al, %0"
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: "=r"(result)
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);
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return result;
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}
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void __syscall_yield(struct regs *r) {
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// for now, just reschedule
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// TODO: reset PIT timer so
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// next process doesn't get an
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// unreasonably small quantum
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schedule(r);
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}
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void syscall(struct regs *r) {
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int syscall_no = r->eax;
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switch (syscall_no) {
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case SYSCALL_yield: {
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__syscall_yield(r);
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break;
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};
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case SYSCALL_getc: {
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process_table[current_pid].state = TASKSTATE_blocked;
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for(uint32_t i = 0; i < MAX_PROCESSES; i++) {
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if(!ps2_waiters[i].alloc) {
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ps2_waiters[i].alloc = 1;
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ps2_waiters[i].pid = current_pid;
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break;
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}
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}
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__syscall_yield(r);
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break;
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};
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case SYSCALL_exit: {
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process_table[current_pid].state = TASKSTATE_unused;
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__syscall_yield(r);
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break;
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};
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}
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}
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