heap.c File Reference

#include <system.h>
#include <string.h>
#include <core/serial.h>
#include <mem/heap.h>
#include <mem/paging.h>

Include dependency graph for heap.c:

Go to the source code of this file.

Functions
u32int	_kmalloc (u32int size, int page_align, u32int *phys_addr)
u32int	kmalloc (u32int size)
u32int	alloc (u32int size, heap *h, int align)
heap *	make_heap (u32int base, u32int max, u32int min)

Variables
heap *	kheap = 0
heap *	curr_heap = 0
page_dir *	kdir
void *	end
void	_end
void	__end
u32int	phys_alloc_addr = (u32int)&end

Function Documentation

u32int _kmalloc	(	u32int	size,
		int	page_align,
		u32int *	phys_addr
	)

Definition at line 24 of file heap.c.

References alloc(), page_entry::frameaddr, get_page(), and phys_alloc_addr.

Referenced by get_page(), init_paging(), and kmalloc().

{
  u32int *addr;

  // Allocate on the kernel heap if one has been created
  if (kheap != 0){
    addr = (u32int*)alloc(size, kheap, page_align);
    if (phys_addr){
      page_entry *page = get_page((u32int)addr, kdir, 0);
      *phys_addr = (page->frameaddr*0x1000) + ((u32int)addr & 0xFFF);
    }
    return (u32int)addr;
  }
  // Else, allocate directly from physical memory
  else {
    if (page_align && (phys_alloc_addr & 0xFFFFF000)){
      phys_alloc_addr &= 0xFFFFF000;
      phys_alloc_addr += 0x1000;
    }
    addr = (u32int*)phys_alloc_addr;
    if (phys_addr){
      *phys_addr = phys_alloc_addr;
    }
    phys_alloc_addr += size;
    return (u32int)addr;
  }
}

u32int alloc	(	u32int	size,
		heap *	h,
		int	align
	)

Definition at line 57 of file heap.c.

References base, KHEAP_BASE, KHEAP_MIN, no_warn, and serial_println().

Referenced by _kmalloc().

{
  no_warn(size||align||h);
  static u32int heap_addr = KHEAP_BASE;

  u32int base = heap_addr;
  heap_addr += size;

  if (heap_addr > KHEAP_BASE + KHEAP_MIN)
    serial_println("Heap is full!");

  return base;
}

u32int kmalloc

(

u32int

size

)

Definition at line 52 of file heap.c.

References _kmalloc().

Referenced by init_paging(), initHeap(), make_heap(), and sys_alloc_mem().

{
  return _kmalloc(size,0,0);
}

heap* make_heap	(	u32int	base,
		u32int	max,
		u32int	min
	)

Definition at line 71 of file heap.c.

References kmalloc(), and no_warn.

Referenced by init_paging().

{  
  no_warn(base||max||min);
  return (heap*)kmalloc(sizeof(heap));
}

Variable Documentation

void __end

void _end

heap* curr_heap = 0

Definition at line 15 of file heap.c.

void* end

page_dir* kdir

Definition at line 21 of file paging.c.

heap* kheap = 0

Definition at line 14 of file heap.c.

u32int phys_alloc_addr = (u32int)&end

Definition at line 22 of file heap.c.

Referenced by _kmalloc(), and init_paging().