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Implement fast syscall/sysret for sytem calls

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This commit is contained in:
Justin C. Miller
2019-03-13 23:51:29 -07:00
parent 97e8f2c69a
commit f7558e3d18
9 changed files with 77 additions and 21 deletions
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14
src/kernel/scheduler.cpp
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@@ -1,6 +1,7 @@
#include "apic.h"
#include "console.h"
#include "cpu.h"
#include "debug.h"
#include "gdt.h"
#include "interrupts.h"
#include "io.h"
@@ -26,6 +27,14 @@ extern "C" {
void load_process(const void *image_start, size_t bytes, process *proc, cpu_state state);
};
struct cpu_data
{
uintptr_t rsp0;
uintptr_t rsp3;
};
static cpu_data bsp_cpu_data;
scheduler::scheduler(lapic *apic) :
m_apic(apic),
m_next_pid(1)
@@ -181,6 +190,7 @@ void
scheduler::start()
{
log::info(logs::task, "Starting scheduler.");
wrmsr(msr::ia32_gs_base, reinterpret_cast<uintptr_t>(&bsp_cpu_data));
m_tick_count = m_apic->enable_timer(isr::isrTimer, quantum_micros, false);
}
@@ -236,7 +246,6 @@ void scheduler::prune(uint64_t now)
uintptr_t
scheduler::schedule(uintptr_t rsp0)
{
// TODO: lol a real clock
static uint64_t now = 0;
@@ -262,7 +271,8 @@ scheduler::schedule(uintptr_t rsp0)
// Set rsp0 to after the end of the about-to-be-popped cpu state
tss_set_stack(0, rsp0 + sizeof(cpu_state));
wrmsr(msr::ia32_kernel_gs_base, rsp0);
bsp_cpu_data.rsp0 = rsp0;
// Swap page tables
page_table *pml4 = m_current->pml4;