working on pmm

Author: frogrammer9

src/kernel/kinit.c

@@ -2,36 +2,40 @@
 #include <stdbigos/types.h>
 
 #include "stdbigos/error.h"
+#include "virtual_memory/pmm.h"
 #include "virtual_memory/ram_map.h"
 #include "virtual_memory/vmm.h"
 
-//TEST:
-#include <stdbigos/csr.h>
-
 #define PANIC(err) if(err) { DEBUG_PRINTF("PANIC - error: %s", get_error_msg(err)); for(;;){continue;} }
 
-extern void kmain();
-
+//TEST:
+#include <stdbigos/csr.h>
 extern void trap_vector();
-
 void handle_trap(uint64_t scause, uint64_t sepc, uint64_t stval) {
     DEBUG_PRINTF("Trap! scause=0x%lx, sepc=0x%lx, stval=0x%lx\n", scause, sepc, stval);
     for(;;);
 }
 
+
+extern void kmain();
+
 [[noreturn]] void kinit(u64 kernel_adr, u64 kernel_size, u64 kernel_stack_adr, u64 kernel_stack_size, u64 ram_start, u64 ram_size) {
-	DEBUG_PRINTF("kinit() run\r\n");
+	ram_size = 64; //HACK: this will be later retrieved from device tree
+	DEBUG_PRINTF("kinit() run. ram_size: %lu\r\n", ram_size);
 	//TEST:
 	//CSR_WRITE(stvec, ((uintptr_t)trap_vector & ~0x3ULL));
 
 
+	error_t err = initialize_pmm(VMS_SV_48, ram_size);
+	PANIC(err);
 	set_ram_map_address((void*)ram_start);
-	error_t err = initialize_virtual_memory(VMS_SV_48);
+	err = initialize_virtual_memory(VMS_SV_48);
 	PANIC(err);
 	asid_t kernel_asid = 0;
 	err = kernel_asid = create_address_space(PAGE_SIZE_2MB, true, false, &kernel_asid);
 	PANIC(err);
 	//TODO: Here kernel maps in VM must be created
+	
 	//err = enable_virtual_memory(kernel_asid);
 	PANIC(err);
 	kmain();

src/kernel/kinit.s

@@ -41,7 +41,7 @@
 		sub a3, t0, a2
 		la a4, ram_start
 		jal ra, kinit
-		mv a5, zero
+		addi a5, zero, 1
 
 	halt:
 		wfi

src/kernel/virtual_memory/pmm.c

@@ -1,7 +1,31 @@
 #include "pmm.h"
+#include "kmalloc.h"
+
+#include <debug/debug_stdio.h>
+/*
+		const i64 shift = 30 - 12 - i * 9; //(* sizeof(gb)) (/ 4 * sizeof(kb)) (/ sizeof(page_size[i]))
+		const u64 size = (((shift < 0) ? (ram_size >> -shift) : ram_size << shift) + 63) >> 6; //ceil_div(x, 64);
+*/
+
+// TODO: replace those functons with stdbit.h
+static int first_zero_bit_index(u64 x) {
+	for(int i = 0; i < 64; ++i) {
+		if(((x >> i) & 1) == 0) return i;
+	}
+	return -1;
+}
+//ENDTODO
+
+static u64* kilo_page_frame_bitmap = nullptr;
+static u16* subpage_busy_counter[5] = { nullptr, nullptr, nullptr, nullptr, nullptr }; //[0] is always null for consistance indexing
+static u64 
+
+error_t initialize_pmm(virtual_memory_scheme_t vms, u64 ram_size) {
+
+}
 
 error_t allocate_page_frame(page_size_t page_size, ppn_t* ppnOUT) { // TODO:
-	return ERR_NONE;
+	//
 }
 
 error_t free_page_frame(ppn_t ppn) { // TODO:

src/kernel/virtual_memory/pmm.h

@@ -5,7 +5,9 @@
 #include <stdbigos/types.h>
 
 #include "mm_common.h"
+#include "vmm.h"
 
+[[nodiscard]] error_t initialize_pmm(virtual_memory_scheme_t vms, u64 ram_size);
 [[nodiscard]] error_t allocate_page_frame(page_size_t page_size, ppn_t* ppnOUT);
 [[nodiscard]] error_t free_page_frame(ppn_t ppn);
 [[nodiscard]] error_t set_phisical_memory_region_busy(ppn_t ppn, u64 size_in_bytes);

src/kernel/virtual_memory/vmm.c

@@ -14,7 +14,7 @@ static address_space_t address_spaces[address_spaces_size] = {0};
 static u64 address_spaces_valid_bit[address_spaces_valid_bit_size] = {0};
 
 // TODO: replace those functons with stdbit.h
-int first_zero_bit_index(u64 x) {
+static int first_zero_bit_index(u64 x) {
 	for(int i = 0; i < 64; ++i) {
 		if(((x >> i) & 1) == 0) return i;
 	}