justin/jsix_import
1
0
Fork 0
Code Issues 1 Pull Requests Actions Packages Projects Releases Wiki Activity

[kernel] Clean up syscall code

Browse Source 
This is a minor refactor including:
- Removing old commented-out syscall_dispatch function
- Removing IA32_EFER syscall-enable flag setting (this is done by the
  bootloader now)
- Moving much logging from inside process/thread syscalls to the 'task'
  log area, allowing for turning the 'syscall' area down to info by
  default.
This commit is contained in:
Justin C. Miller
2021-01-23 20:37:20 -08:00
parent 16b9d4fd8b
commit 211a3c2358
5 changed files with 10 additions and 91 deletions
Download Patch File Download Diff File Expand all files Collapse all files

81
src/kernel/syscall.cpp
View File

@@ -13,10 +13,6 @@ extern "C" {
void syscall_handler_prelude();
}
namespace syscalls {
} // namespace syscalls
uintptr_t syscall_registry[static_cast<unsigned>(syscall::MAX)];
const char * syscall_names[static_cast<unsigned>(syscall::MAX)];
@@ -44,86 +40,9 @@ syscall_invalid(uint64_t call)
_halt();
}
/*
void
syscall_dispatch(cpu_state *regs)
{
console *cons = console::get();
syscall call = static_cast<syscall>(regs->rax);
auto &s = scheduler::get();
auto *p = s.current();
switch (call) {
case syscall::noop:
break;
case syscall::debug:
cons->set_color(11);
cons->printf("\nProcess %d: Received DEBUG syscall\n", p->pid);
cons->set_color();
print_regs(*regs);
cons->printf("\n Syscall enters: %8d\n", __counter_syscall_enter);
cons->printf(" Syscall sysret: %8d\n", __counter_syscall_sysret);
break;
case syscall::send:
{
pid_t target = regs->rdi;
uintptr_t data = regs->rsi;
cons->set_color(11);
cons->printf("\nProcess %d: Received SEND syscall, target %d, data %016lx\n", p->pid, target, data);
cons->set_color();
if (p->wait_on_send(target))
s.schedule();
}
break;
case syscall::receive:
{
pid_t source = regs->rdi;
uintptr_t data = regs->rsi;
cons->set_color(11);
cons->printf("\nProcess %d: Received RECEIVE syscall, source %d, dat %016lx\n", p->pid, source, data);
cons->set_color();
if (p->wait_on_receive(source))
s.schedule();
}
break;
case syscall::fork:
{
cons->set_color(11);
cons->printf("\nProcess %d: Received FORK syscall\n", p->pid);
cons->set_color();
pid_t pid = p->fork(regs);
cons->printf("\n fork returning %d\n", pid);
regs->rax = pid;
}
break;
default:
cons->set_color(9);
cons->printf("\nReceived unknown syscall: %02x\n", call);
cons->set_color();
_halt();
break;
}
}
*/
void
syscall_enable()
{
// IA32_EFER - set bit 0, syscall enable
uint64_t efer = rdmsr(msr::ia32_efer);
wrmsr(msr::ia32_efer, efer|1);
// IA32_STAR - high 32 bits contain k+u CS
// Kernel CS: GDT[1] ring 0 bits[47:32]
// User CS: GDT[3] ring 3 bits[63:48]