62c559043d
The syscall/sysret instructions don't swap stacks. This was bad but passable until syscalls caused the scheduler to run, and scheduling a task that paused due to interrupt. Adding a new (hopefully temporary) syscall interrupt `int 0xee` to allow me to test syscalls without stack issues before I tackle the syscall/sysret issue. Also implemented a basic `pause` syscall that causes the calling process to become unready. Because nothing can wake a process yet, it never returns.
61 lines
1.2 KiB
C++
61 lines
1.2 KiB
C++
#include "console.h"
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#include "cpu.h"
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#include "debug.h"
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#include "scheduler.h"
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#include "syscall.h"
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extern "C" {
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void _halt();
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}
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addr_t
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syscall_dispatch(addr_t return_rsp, const cpu_state ®s)
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{
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console *cons = console::get();
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syscall call = static_cast<syscall>(regs.rax);
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switch (call) {
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case syscall::noop:
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break;
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case syscall::debug:
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cons->set_color(11);
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cons->printf("\nReceived DEBUG syscall\n");
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cons->set_color();
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print_regs(regs);
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break;
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case syscall::message:
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cons->set_color(11);
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cons->printf("\nReceived MESSAGE syscall\n");
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cons->set_color();
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break;
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case syscall::pause:
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{
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cons->set_color(11);
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auto &s = scheduler::get();
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auto *p = s.current();
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p->flags -= process_flags::ready;
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//log::debug(logs::task, "Pausing process %d, flags: %08x", p->pid, p->flags);
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cons->printf("\nReceived PAUSE syscall\n");
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return_rsp = s.tick(return_rsp);
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//log::debug(logs::task, "Switching to stack %016lx", return_rsp);
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cons->printf("\nDONE WITH PAUSE syscall\n");
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cons->set_color();
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}
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break;
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default:
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cons->set_color(9);
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cons->printf("\nReceived unknown syscall: %02x\n", call);
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cons->set_color();
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_halt();
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break;
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}
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return return_rsp;
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}
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