slinky55/RockOS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

working on reading elf from initrd, and getting it launched with the new scheduler

Browse Source
This commit is contained in:
slinky55
2026-06-30 19:26:31 -05:00
parent ce81d4eb31
commit af6c1c94cf
21 changed files with 253 additions and 151 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
kernel/scheduler.c
View File

@@ -8,6 +8,7 @@
#include "common.h"
#include "process.h"
#include "scheduler.h"
#include "gdt.h"
static process_t* process_table;
@@ -68,9 +69,10 @@ uint32_t switch_context(uint32_t current_esp) {
current_process = next_process;
tss.esp0 = process_table[current_process].esp0;
if (fetch_cr3() != process_table[current_process].cr3) {
extern void load_pd(uint32_t table);
load_pd(process_table[current_process].cr3);
load_pd((void*)process_table[current_process].cr3);
}
return process_table[current_process].esp;
@@ -88,12 +90,12 @@ void init_scheduler() {
process->sleep = 0;
total_processes++;
create_task((uint32_t)idle_task, fetch_cr3());
create_task((uint32_t)idle_task, fetch_cr3(), 0);
current_process = 0;
}
int create_task(uint32_t entry_point, uint32_t cr3) {
int create_task(uint32_t entry_point, uint32_t cr3, int user) {
if (total_processes >= 16) {
return 0;
}
@@ -117,10 +119,20 @@ int create_task(uint32_t entry_point, uint32_t cr3) {
void* stack_bottom = kalloc(4096);
uint32_t* esp = (uint32_t*)((uint32_t)stack_bottom + 4096);
process->esp0 = (uint32_t)esp;
*(--esp) = 0x0202; // EFLAGS
*(--esp) = 0x08; // CS
*(--esp) = entry_point; // EIP
if (user) {
*(--esp) = 0x23; // User Data Segment (SS) with RPL 3 (0x20 | 3)
*(--esp) = 0xBFFFF000; // User Stack Pointer (ESP) - location mapped in user space
*(--esp) = 0x0202; // EFLAGS (Interrupts enabled)
*(--esp) = 0x1B; // User Code Segment (CS) with RPL 3 (0x18 | 3)
*(--esp) = entry_point; // EIP
} else {
// IRET values for Ring 0
*(--esp) = 0x0202; // EFLAGS
*(--esp) = 0x08; // Kernel Code Segment (CS)
*(--esp) = entry_point; // EIP
}
*(--esp) = 0; // EAX
*(--esp) = 0; // ECX