nathan/quark-kernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Finished basic task switching mechansim

Browse Source 
PCB is local to a process's address space.
Context switches are written in assembly.
Moved x86 headers to include/x86
This commit is contained in:
ngiddings
2021-04-19 03:40:33 -05:00
parent 086dfe546a
commit 5efc389935
22 changed files with 246 additions and 162 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
src/x86/isr.c
View File

@@ -1,32 +1,43 @@
#include "kernel.h"
#include "isr.h"
#include "x86/isr.h"
#include "stdio.h"
#include "apic.h"
#include "x86/apic.h"
#include "x86/processstate.h"
#include "context.h"
void isr_generic(void* frame)
struct interrupt_frame_t
{
size_t eip;
size_t cs;
size_t eflags;
size_t esp;
size_t ss;
};
void isr_generic(struct interrupt_frame_t *frame)
{
printf("Generic interrupt.\n");
}
void isr_division_by_zero(void* frame)
void isr_division_by_zero(struct interrupt_frame_t *frame)
{
printf("Exception: Division by zero\n");
}
void isr_gp_fault(void* frame, unsigned int error)
void isr_gp_fault(struct interrupt_frame_t *frame, unsigned int error)
{
asm("cli");
asm("mov $0x10, %%ax; "
"mov %%ax, %%ds; "
"mov %%ax, %%es; "
"mov %%ax, %%fs; "
"mov %%ax, %%gs; "
::: "ax");
"mov %%ax, %%gs; " ::
: "ax");
printf("Exception: GP fault, code %08x\n", error);
asm("hlt");
}
void isr_page_fault(void* frame, unsigned int error)
void isr_page_fault(struct interrupt_frame_t *frame, unsigned int error)
{
size_t addr;
asm("mov %%cr2, %0"
@@ -35,53 +46,26 @@ void isr_page_fault(void* frame, unsigned int error)
"mov %%ax, %%ds; "
"mov %%ax, %%es; "
"mov %%ax, %%fs; "
"mov %%ax, %%gs; "
::: "ax");
"mov %%ax, %%gs; " ::
: "ax");
printf("Exception: Page fault, code %08x, linear address %08x\n", error, addr);
asm("hlt");
}
void isr_double_fault(void* frame, unsigned int error)
void isr_double_fault(struct interrupt_frame_t *frame, unsigned int error)
{
asm("cli");
printf("Exception: Double fault (!!), code %08x\n", error);
asm("hlt");
}
void isr_timer(void* frame)
void isr_timer(struct interrupt_frame_t *frame)
{
printf("Timer tick.\n");
apic_eoi();
}
void isr_preempt(void* frame)
void isr_syscall(struct interrupt_frame_t *frame)
{
asm("pushal; "
"mov %esp, %ebp; ");
asm("mov $0x10, %%ax; "
"mov %%ax, %%ds; "
"mov %%ax, %%es; "
"mov %%ax, %%fs; "
"mov %%ax, %%gs; "
::: "ax");
struct process_state_t *process_state;
asm("mov %%ebp, %0"
: "=r"(process_state));
printf("Preempted process %08x.\n", kernel_state.active_process);
apic_eoi();
next_process(&kernel_state, process_state);
}
void isr_ap_start(void* frame)
{
asm(".code16");
//...
asm(".code32");
// do something useful
}
void isr_syscall(void* frame)
{
}