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New image decoder

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boreddevnl
2026-03-08 19:23:22 +01:00
parent 032b154f41
commit 3fbcf3d4fd
43 changed files with 582 additions and 2754 deletions
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44
src/kernel/process.c
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@@ -31,8 +31,7 @@ void process_init(void) {
kernel_proc->pml4_phys = paging_get_pml4_phys();
kernel_proc->kernel_stack = 0;
// Initialize FPU state for kernel
asm volatile("fxsave %0" : "=m"(kernel_proc->fpu_state));
// Initialize FPU/SSE state for kernel (first interrupt will capture it on stack)
kernel_proc->fpu_initialized = true;
for (int i = 0; i < MAX_PROCESS_FDS; i++) kernel_proc->fds[i] = NULL;
@@ -58,12 +57,12 @@ void process_create(void* entry_point, bool is_user) {
if (!new_proc->pml4_phys) return;
// 2. Allocate aligned stack
void* stack = kmalloc_aligned(4096, 4096);
void* user_stack = kmalloc_aligned(4096, 4096);
void* kernel_stack = kmalloc_aligned(32768, 32768); // Needed for when user interrupts to Ring 0
if (is_user) {
// Map user stack to 0x800000
paging_map_page(new_proc->pml4_phys, 0x800000, v2p((uint64_t)stack), PT_PRESENT | PT_RW | PT_USER);
paging_map_page(new_proc->pml4_phys, 0x800000, v2p((uint64_t)user_stack), PT_PRESENT | PT_RW | PT_USER);
// Allocate code page aligned and copy code
void* code = kmalloc_aligned(4096, 4096);
@@ -86,11 +85,16 @@ void process_create(void* entry_point, bool is_user) {
// Push 15 zeros for general purpose registers (r15 -> rax)
for (int i = 0; i < 15; i++) *(--stack_ptr) = 0;
// Push 512 bytes for SSE/FPU state (fxsave_region)
// Zero it out for safety
stack_ptr = (uint64_t*)((uint64_t)stack_ptr - 512);
for (int i = 0; i < 512/8; i++) stack_ptr[i] = 0;
new_proc->kernel_stack = (uint64_t)kernel_stack + 32768;
new_proc->rsp = (uint64_t)stack_ptr;
} else {
// Kernel thread
uint64_t* stack_ptr = (uint64_t*)((uint64_t)stack + 4096);
uint64_t* stack_ptr = (uint64_t*)((uint64_t)kernel_stack + 32768);
*(--stack_ptr) = 0x10; // SS (Kernel Data)
stack_ptr--;
*stack_ptr = (uint64_t)stack_ptr; // RSP
@@ -100,15 +104,21 @@ void process_create(void* entry_point, bool is_user) {
*(--stack_ptr) = 0; // int_no
*(--stack_ptr) = 0; // err_code
// Push 15 zeros for general purpose registers (r15 -> rax)
for (int i = 0; i < 15; i++) *(--stack_ptr) = 0;
new_proc->kernel_stack = 0;
// Push 512 bytes for SSE/FPU state (fxsave_region)
stack_ptr = (uint64_t*)((uint64_t)stack_ptr - 512);
// Zero it out for safety
for (int i = 0; i < 512/8; i++) stack_ptr[i] = 0;
new_proc->kernel_stack = (uint64_t)kernel_stack + 32768;
new_proc->rsp = (uint64_t)stack_ptr;
kfree(user_stack); // Unused for kernel threads
}
// Initialize FPU state for new process
asm volatile("fninit");
asm volatile("fxsave %0" : "=m"(new_proc->fpu_state));
new_proc->fpu_initialized = true;
// Add to linked list
@@ -246,7 +256,6 @@ process_t* process_create_elf(const char* filepath, const char* args_str) {
*(--stack_ptr) = entry_point; // RIP
*(--stack_ptr) = 0; // err_code
*(--stack_ptr) = 0; // int_no
// 15 General purpose registers
*(--stack_ptr) = 0; // RAX
*(--stack_ptr) = 0; // RBX
@@ -263,6 +272,12 @@ process_t* process_create_elf(const char* filepath, const char* args_str) {
*(--stack_ptr) = 0; // R13
*(--stack_ptr) = 0; // R14
*(--stack_ptr) = 0; // R15
// Space for 512-byte fxsave_region
stack_ptr = (uint64_t*)((uint64_t)stack_ptr - 512);
// Initialize with a clean FPU state
asm volatile("fninit");
asm volatile("fxsave %0" : "=m"(*stack_ptr));
new_proc->kernel_stack = (uint64_t)kernel_stack + 32768;
new_proc->kernel_stack_alloc = kernel_stack;
@@ -271,7 +286,6 @@ process_t* process_create_elf(const char* filepath, const char* args_str) {
// Initialize FPU state for new process
asm volatile("fninit");
asm volatile("fxsave %0" : "=m"(new_proc->fpu_state));
new_proc->fpu_initialized = true;
// Slot is already counted in process_count if new, or reused.
@@ -296,21 +310,11 @@ uint64_t process_schedule(uint64_t current_rsp) {
// serial_write("SCHED\n");
// Save context
// Save/Restore context
current_process->rsp = current_rsp;
// Save FPU state
if (current_process->fpu_initialized) {
asm volatile("fxsave %0" : "=m"(current_process->fpu_state));
}
// Switch process
current_process = current_process->next;
// Restore FPU state
if (current_process->fpu_initialized) {
asm volatile("fxrstor %0" : : "m"(current_process->fpu_state));
}
// Update Kernel Stack for User Mode interrupts and System Calls
if (current_process->is_user && current_process->kernel_stack) {