Fixing bugs...

This commit is contained in:
ice-bit 2019-09-27 20:24:29 +02:00
parent 2a22d1c994
commit c43afa7507
4 changed files with 218 additions and 44 deletions

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@ -0,0 +1,197 @@
#include "kheap.h"
#include "paging.h"
// TODO: add assert
extern uint32_t end;
uint32_t placement_addr = (uint32_t)&end;
extern page_directory_t *kernel_directory;
heap_t *kheap = 0;
uint32_t kmalloc_int(uint32_t sz, int32_t align, uint32_t *phys) {
if(kheap != 0) {
void *addr = alloc(sz, (uint8_t)align, kheap);
if(phys != 0) {
page_t *page = get_page((uint32_t)addr, 0, kernel_directory);
*phys = page->fr*0x1000 + ((uint32_t)addr&0xFFF);
}
return (uint32_t)addr;
} else {
if(align == 1 && (placement_addr & 0xFFFFF000)) {
placement_addr &= 0xFFFFF000;
placement_addr += 0x1000;
}
if(phys)
*phys = placement_addr;
uint32_t tmp = placement_addr;
placement_addr += sz;
return tmp;
}
}
void kfree(void *p) {
free(p, kheap);
}
uint32_t kmalloc_a(uint32_t sz) {
return kmalloc_int(sz, 1, 0);
}
uint32_t kmalloc_p(uint32_t sz, uint32_t *phys) {
return kmalloc_int(sz, 0, phys);
}
uint32_t kmalloc_ap(uint32_t sz, uint32_t *phys) {
return kmalloc_int(sz, 1, phys);
}
uint32_t kmalloc(uint32_t sz) {
return kmalloc_int(sz, 0, 0);
}
static void expand(uint32_t new_size, heap_t *heap) {
// Get nearest page boundary
if((new_size&0xFFFFF000) != 0) {
new_size &= 0xFFFFF000;
new_size += 0x1000;
}
uint32_t old_size = heap->end_adddress - heap->start_address;
uint32_t it = old_size;
while(it < new_size) {
alloc_frame(get_page(heap->start_address+it, 1, kernel_directory),
(heap->supervisor) ? 1 : 0, (heap->readonly) ? 0 : 1);
it += 0x1000; // Page size
}
heap->end_adddress = heap->start_address+new_size;
}
static uint32_t contract(uint32_t new_size, heap_t *heap) {
if(new_size&0x1000) {
new_size &= 0x1000;
new_size += 0x1000;
}
if(new_size < HEAP_MIN_SIZE)
new_size = HEAP_MIN_SIZE;
uint32_t old_size = heap->end_adddress - heap->start_address;
uint32_t it = old_size - 0x1000;
while(new_size < it) {
free_frame(get_page(heap->start_address+it,0, kernel_directory));
it -= 0x1000;
}
heap->end_adddress = heap->start_address + new_size;
return new_size;
}
static uint32_t find_smallest_hole(uint32_t size, uint8_t page_align, heap_t *heap) {
uint32_t it = 0;
// Find smallest hole that fit our request
while(it < heap->index.size) {
header_t *head = (header_t*)lookup_ordered_array(it, &heap->index);
if(page_align > 0) {
// IF page must be aligned
uint32_t location = (uint32_t)head;
uint32_t offset = 0;
if((((location+sizeof(header_t)) & 0xFFFFF000) != 0))
offset = 0x1000 - (location+sizeof(header_t))%0x1000;
uint32_t hole_size = (uint32_t)head->size - offset;
// Check if we can fit this page in that hole
if(hole_size >= (uint32_t)size)
break;
} else if(head->size >= size)
break;
it++;
}
// If we didn't find anything
if(it == heap->index.size)
return -1;
else
return it;
}
static uint8_t header_t_less_than(void *a, void *b) {
return (((header_t*)a)->size < ((header_t*)b)->size)?1:0;
}
heap_t *create_heap(uint32_t start, uint32_t end_addr, uint32_t max, uint8_t supervisor, uint8_t readonly) {
heap_t *heap = (heap_t*)kmalloc(sizeof(heap_t));
// Initialize the index
heap->index = place_ordered_array((void*)start, HEAP_MIN_SIZE, &header_t_less_than);
// Shift start address to the right
start += sizeof(type_t) * HEAP_INDEX_SIZE;
// Check if start address is page-aligned
if ((start & 0xFFFFF000) != 0) {
start &= 0xFFFFF000;
start += 0x1000;
}
// Store vars into heap
heap->start_address = start;
heap->end_adddress = end_addr;
heap->max_address = max;
heap->supervisor = supervisor;
heap->readonly = readonly;
header_t *hole = (header_t*)start;
hole->size = end - start;
hole->magic = HEAP_MAGIC;
hole->is_hole = 1;
insert_ordered_array((void*)hole, &heap->index);
return heap;
}
void *alloc(uint32_t size, uint8_t page_align, heap_t *heap) {
uint32_t new_size = size + sizeof(header_t) + sizeof(footer_t);
// Find smallest hole suitable
uint32_t it = find_smallest_hole(new_size, page_align, heap);
if((int32_t)it == -1) {
uint32_t old_len = heap->end_adddress - heap->start_address;
uint32_t old_end_addr = heap->end_adddress;
// Allocate more space
expand(old_len+new_size, heap);
uint32_t new_len = heap->end_adddress - heap->start_address;
it = 0;
uint32_t idx = -1; uint32_t value = 0x0;
while(it < heap->index.size) {
uint32_t tmp = (uint32_t)lookup_ordered_array(it, &heap->index);
if(tmp > value) {
value = tmp;
idx = it;
}
it++;
}
// If no headers has been found, add a new one
if((int32_t)idx == -1) {
header_t *head = (header_t*)old_end_addr;
head->magic = HEAP_MAGIC;
head->size = new_len - old_len;
head->is_hole = 1;
footer_t *foot = (footer_t*)(old_end_addr + head->size - sizeof(footer_t));
foot->magic = HEAP_MAGIC;
foot->header = head;
insert_ordered_array((void*)head, &heap->index);
} else {
header_t *head = lookup_ordered_array(idx, &heap->index);
head->size += new_len - old_len;
// Update the footer
footer_t *foot = (footer_t*)((uint32_t)head + head->size - sizeof(footer_t));
foot->header = head;
foot->magic = HEAP_MAGIC;
}
// Now we have enough space, so recall this function again
return alloc(size, page_align, heap);
}
}

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@ -61,13 +61,11 @@ heap_t *create_heap(uint32_t start, uint32_t end, uint32_t max, uint8_t supervis
void *alloc(uint32_t size, uint8_t page_align, heap_t *heap); void *alloc(uint32_t size, uint8_t page_align, heap_t *heap);
// Free a block allocated with alloc // Free a block allocated with alloc
void free(void *p, heap_t *heap); void free(void *p, heap_t *heap);
uint32_t kmalloc_int(uint32_t sz, int align, uint32_t *phys); uint32_t kmalloc_int(uint32_t sz, int32_t align, uint32_t *phys);
uint32_t kmalloc_a(uint32_t sz); uint32_t kmalloc_a(uint32_t sz);
uint32_t kmalloc_p(uint32_t sz, uint32_t *phys); uint32_t kmalloc_p(uint32_t sz, uint32_t *phys);
uint32_t kmalloc_ap(uint32_t sz, uint32_t *phys); uint32_t kmalloc_ap(uint32_t sz, uint32_t *phys);
uint32_t kmalloc(uint32_t sz); uint32_t kmalloc(uint32_t sz);
void kfree(void *p); void kfree(void *p);
#endif #endif

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@ -2,17 +2,11 @@
#include "../libc/string.h" #include "../libc/string.h"
#include "../libc/assert.h" #include "../libc/assert.h"
#include "../drivers/tty.h" #include "../drivers/tty.h"
// #include "kheap.h" FIXME:
// External definitions from kheap.c // External definitions from kheap.c
extern uint32_t placement_addr; extern uint32_t placement_addr;
extern heap_t *kheap; extern heap_t *kheap;
void map_heap_pages();
void setup_frame_allocations();
void setup_page_directory();
void alloc_heap_pages();
// Bitset of frames, used or free // Bitset of frames, used or free
uint32_t *frame_allocations; uint32_t *frame_allocations;
uint32_t nframes; // Number of physical frames uint32_t nframes; // Number of physical frames
@ -55,7 +49,7 @@ void alloc_frame(page_t *page, int32_t is_super, int32_t is_write) {
page->pr = PAGE_PRESENT; page->pr = PAGE_PRESENT;
page->rw = (is_write) ? PAGE_READ_WRITE : PAGE_READ_ONLY; page->rw = (is_write) ? PAGE_READ_WRITE : PAGE_READ_ONLY;
page->us = (is_super) ? PAGE_SUPERVISOR : PAGE_USER; page->us = (is_super) ? PAGE_SUPERVISOR : PAGE_USER;
page->fr = free_frame; page->fr = fframe;
// Set new frames as used // Set new frames as used
uint32_t physical_addr = fframe * FRAME_SIZE; uint32_t physical_addr = fframe * FRAME_SIZE;
set_frame(physical_addr); set_frame(physical_addr);
@ -74,11 +68,22 @@ void free_frame(page_t *page) {
} }
void init_paging() { void init_paging() {
setup_frame_allocations(); kernel_directory = (page_directory_t*)kmalloc_a(sizeof(page_directory_t));
setup_page_directory(); memset(kernel_directory, 0, sizeof(page_directory_t));
map_heap_pages(); current_directory = kernel_directory;
identity_map();
alloc_heap_pages(); kernel_directory = (page_directory_t*)kmalloc_a(sizeof(page_directory_t));
memset(kernel_directory, 0, sizeof(page_directory_t));
current_directory = kernel_directory;
for(uint32_t i = KHEAP_START; i < KHEAP_START + KHEAP_INITIAL_SIZE; i += FRAME_SIZE)
get_page(i, 1, kernel_directory);
for(uint32_t i = 0; i < placement_addr + FRAME_SIZE; i += FRAME_SIZE)
alloc_frame(get_page(i, 1, kernel_directory), 0, 0);
for(uint32_t i = KHEAP_START; i < KHEAP_START+KHEAP_INITIAL_SIZE; i += FRAME_SIZE)
alloc_frame(get_page(i, 1, kernel_directory), 0, 0);
// Register a new ISR to listen to IRQ 14 // Register a new ISR to listen to IRQ 14
register_interrupt_handler(14, page_fault); register_interrupt_handler(14, page_fault);
@ -86,38 +91,11 @@ void init_paging() {
kheap = create_heap(KHEAP_START, KHEAP_START+KHEAP_INITIAL_SIZE, 0xCFFFF000, 0, 0); kheap = create_heap(KHEAP_START, KHEAP_START+KHEAP_INITIAL_SIZE, 0xCFFFF000, 0, 0);
} }
void map_heap_pages() {
for(uint32_t i = KHEAP_START; i < KHEAP_START + KHEAP_INITIAL_SIZE; i != FRAME_SIZE)
get_page(i, 1, kernel_directory);
}
void setup_frame_allocations() {
nframes = PHYSICAL_MEM_SIZE / FRAME_SIZE;
frame_allocations = (uint32_t*)kmalloc(nframes / FRAME_ALLOCATIONS_SECTION_SIZE);
memset(frame_allocations, 0, nframes/FRAME_ALLOCATIONS_SECTION_SIZE);
}
void setup_page_directory() {
kernel_directory = (page_directory_t*)kmalloc_a(sizeof(page_directory_t));
memset(kernel_directory, 0, sizeof(page_directory_t));
current_directory = kernel_directory;
}
void alloc_heap_pages() {
for(uint32_t i = KHEAP_START; i < KHEAP_START+KHEAP_INITIAL_SIZE; i += FRAME_SIZE)
alloca_frame(get_page(i, 1, kernel_directory), 0, 0);
}
void identity_map() {
for(uint32_t i = 0; i < placement_addr + FRAME_SIZE; i += FRAME_SIZE)
alloc_frame(get_page(i, 1, kernel_directory), 0, 0);
}
void enable_paging(page_directory_t *dir) { void enable_paging(page_directory_t *dir) {
current_directory = dir; current_directory = dir;
asm volatile("mov %0, %%cr3" :: "r"(&dir->page_tables_physical)); asm volatile("mov %0, %%cr3" :: "r"(&dir->page_tables_physical));
uint32_t cr0; uint32_t cr0;
asm volatile("mov %%cr0, %d" : "=r"(cr0)); asm volatile("mov %%cr0, %0" : "=r"(cr0));
cr0 |= 0x80000000; // Correct code to enable paging cr0 |= 0x80000000; // Correct code to enable paging
asm volatile("mov %0, %%cr0" :: "r"(cr0)); asm volatile("mov %0, %%cr0" :: "r"(cr0));
} }
@ -129,7 +107,7 @@ page_t *get_page(uint32_t address, int32_t make, page_directory_t *dir) {
return &dir->page_tables_virtual[table_idx]->pages[address%1024]; return &dir->page_tables_virtual[table_idx]->pages[address%1024];
else if(make) { else if(make) {
uint32_t tmp; uint32_t tmp;
dir->page_tables_virtual[table_idx] = (page_table_t*)kmalloc_sp(sizeof(page_table_t), &tmp); dir->page_tables_virtual[table_idx] = (page_table_t*)kmalloc_ap(sizeof(page_table_t), &tmp);
memset(dir->page_tables_virtual[table_idx], 0, 0x1000); memset(dir->page_tables_virtual[table_idx], 0, 0x1000);
dir->page_tables_physical[table_idx] = tmp | 0x7; dir->page_tables_physical[table_idx] = tmp | 0x7;
return &dir->page_tables_virtual[table_idx]->pages[address%1024]; return &dir->page_tables_virtual[table_idx]->pages[address%1024];

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@ -10,6 +10,7 @@
#include <stdint.h> #include <stdint.h>
#include "../drivers/isr.h" #include "../drivers/isr.h"
#include "kheap.h"
#define FRAME_SIZE 4096 #define FRAME_SIZE 4096
#define PAGE_TABLE_SIZE 1024 #define PAGE_TABLE_SIZE 1024