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user
2026-02-03 21:02:33 +01:00
parent 13e63b825d
commit e8818d2b23
4 changed files with 14 additions and 14 deletions
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2
kernel/boot/longmode.asm
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@@ -4,7 +4,6 @@
; Pointer to Long Mode Global Descriptor Table (GDT, arch/gdt.cc)
[EXTERN gdt_long_mode_pointer]
[GLOBAL long_mode]
long_mode:
@@ -247,7 +246,6 @@ long_mode_start:
; Call high-level (C++) kernel initialization function
call kernel_init
; Print `STOP` to screen and stop
mov rax, 0x2f502f4f2f544f53
mov qword [0xb8000], rax

6
kernel/boot/startup.cc
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@@ -8,7 +8,7 @@
#include "../compiler/libc.h"
#include "../debug/output.h"
#include "../interrupt/handlers.h"
#include "../memory/pageframealloc.h"
extern "C" [[noreturn]] void kernel_init() {
// Setup and load Interrupt Description Table (IDT)
initInterruptHandlers();
@@ -16,7 +16,9 @@ extern "C" [[noreturn]] void kernel_init() {
// Initialize PICs
PIC::initialize();
// Call global constructors
PageFrameAllocator::init();
// Call global constructors
CSU::initializer();
//Select 5th Segment in GDT. 5<<3 == 0x28

11
kernel/main.cc
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@@ -13,8 +13,14 @@
#include "./device/serialstream.h"
// Separate title window on first line (for simplicity at scrolling)
void PageFrameAllocator::init();
static TextStream tout(0, CGA::COLUMNS, 0, 1);
SerialStream sout;
TextStream dout(0, 80, 17, 25);
@@ -40,12 +46,11 @@ alignas(4096) four_lvl_paging_t paging_tree;
static const uint32_t NUM_APPS = 9;
Application apps[NUM_APPS];
static KeyboardApplication kapp;
//static KeyboardApplication kapp;
// Main function
extern "C" int main() {
PageFrameAllocator::init();
memset(&paging_tree, 0, sizeof(four_lvl_paging_t));
create_basic_page_table((uintptr_t)&paging_tree);
load_cr3((void*)&paging_tree.l4);
@@ -76,7 +81,7 @@ extern "C" int main() {
g.vault().scheduler.ready(&(apps[i]));
}
g.vault().scheduler.ready(&kapp);
//g.vault().scheduler.ready(&kapp);
// Enable Interrupts
Core::Interrupt::enable();

9
kernel/memory/pageframealloc.cc
View File

@@ -12,14 +12,14 @@
PageFrame PageFrameAllocator::PageFrames[4294967296 / 4096];
void mark_pageframes(uintptr_t start, uintptr_t end, bool available){
DBG << "start: " << hex << start << " end: " << end;
// DBG << "start: " << hex << start << " end: " << end;
start = Page::floor(start);
end = Page::ceil(end);
if(start > 4294967296)
start = 4294967296;
if(end > 4294967296)
end = 4294967296;
DBG << " page start: " << hex << start << " end: " << end << endl;
//DBG << " page start: " << hex << start << " end: " << end << endl;
for(uint64_t i = start; i < end; i += 4096){
uint64_t pg = i/4096;
@@ -62,19 +62,14 @@ void PageFrameAllocator::init(){
}
//mark other known regions as unavailable
DBG << "kernel image ";
mark_pageframes((uintptr_t)&___KERNEL_START___, (uintptr_t)&___KERNEL_END___, false);
DBG << "ISA adresses ";
mark_pageframes(0x00F00000, 0x00FFFFFF, false);
DBG << "LAPIC ";
mark_pageframes(0xfee00000, 0xfee003f0, false);
DBG << "IO APIC ";
mark_pageframes(APIC::getIOAPICAddress(), APIC::getIOAPICAddress()+0x10, false);
stats();
}
void PageFrameAllocator::stats(){