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wip on fork

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minimal example works
This commit is contained in:
Eggert Jung
2026-02-25 11:32:22 +01:00
parent 22ab2fb2a5
commit 8b271e2470
8 changed files with 64 additions and 18 deletions
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29
kernel/syscall/skeleton.cc
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@@ -9,6 +9,7 @@
#include "../thread/scheduler.h"
#include "../memory/pageframealloc.h"
#include "../memory/pagetable.h"
#include "../arch/idt.h"
void *operator new(size_t, void *);
//#include "../user/app1/appl.h"
@@ -175,8 +176,6 @@ namespace Syscall {
bool copy_from_phys(Vault& vault, uintptr_t phys_ptr, void* virt_ptr, size_t size) {
Thread* current_thread = vault.scheduler.active();
size_t offset = Page::offset(phys_ptr);
size_t total_size = size + offset;
four_lvl_paging_t* search_table = vault.scheduler.active()->paging_tree;
@@ -185,10 +184,10 @@ bool copy_from_phys(Vault& vault, uintptr_t phys_ptr, void* virt_ptr, size_t siz
if (virt_addr == nullptr) {
return false;
}
for(uint8_t i =0; i<size/4096 +1; i++){
setMapping((uintptr_t)virt_addr, (void*)phys_ptr, vault.scheduler.active()->paging_tree);
}
for(uint8_t i =0; i<size/4096 +1; i++){
setMapping((uintptr_t)virt_addr, (void*)phys_ptr, vault.scheduler.active()->paging_tree);
}
memcpy(virt_ptr, (void*)((uintptr_t)(virt_addr)+ (uintptr_t)offset), size);
setMapping((uintptr_t)(virt_addr), 0, search_table);
@@ -280,9 +279,25 @@ bool reply(Vault& v, const void* buffer, size_t size) {
return true;
}
void copy_stack(Thread* parent, Thread* child){
uintptr_t dest_frame = isMapped((uintptr_t)child->StackPointer.user, child->paging_tree);
void* dest_vaddr = getFreeVirtSpace(parent->paging_tree, 1);
setMapping((uintptr_t)dest_vaddr, (void*)dest_frame, parent->paging_tree);
memcpy(dest_vaddr, (void*)0x6000000/*((uintptr_t)parent->StackPointer.user & ~0xFFF)*/, 4096);
setMapping((uintptr_t)dest_vaddr, 0, parent->paging_tree);
}
int fork(Vault &vault, InterruptContext *user_context) {
Thread* parent = vault.scheduler.active();
//Thread* child = new Thread(false,
Thread* child = new Thread(false, (void*)user_context->ip, parent->code_paddr, parent->code_pagenum);
copy_pagetable(parent->paging_tree, child->paging_tree);
copy_stack(parent, child);
child->StackPointer.user = (void*)user_context->sp;
vault.scheduler.ready(child);
return 0;
}