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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
789 changed files with 95825 additions and 0 deletions
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94
src/generic/physmem.c Normal file
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/*
* Global physical memory descriptions.
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <l4/generic/physmem.h>
#include <l4/generic/pgalloc.h>
#include <l4/generic/tcb.h>
#include <l4/lib/list.h>
#include <l4/lib/spinlock.h>
#include INC_SUBARCH(mm.h)
#include INC_GLUE(memlayout.h)
#include INC_GLUE(memory.h)
#include INC_PLAT(offsets.h)
#include INC_PLAT(printascii.h)
#include INC_ARCH(linker.h)
struct page_bitmap page_map;
static void init_page_map(unsigned long start, unsigned long end)
{
page_map.pfn_start = __pfn(start);
page_map.pfn_end = __pfn(end);
set_page_map(start, __pfn(end - start), 0);
}
/*
* Marks pages in the global page_map as used or unused.
*
* @start = start page address to set, inclusive.
* @numpages = number of pages to set.
*/
int set_page_map(unsigned long start, int numpages, int val)
{
unsigned long pfn_start = __pfn(start);
unsigned long pfn_end = __pfn(start) + numpages;
unsigned long pfn_err = 0;
if (page_map.pfn_start > pfn_start || page_map.pfn_end < pfn_start) {
pfn_err = pfn_start;
goto error;
}
if (page_map.pfn_end < pfn_end || page_map.pfn_start > pfn_end) {
pfn_err = pfn_end;
goto error;
}
if (val)
for (int i = pfn_start; i < pfn_end; i++)
page_map.map[BITWISE_GETWORD(i)] |= BITWISE_GETBIT(i);
else
for (int i = pfn_start; i < pfn_end; i++)
page_map.map[BITWISE_GETWORD(i)] &= ~BITWISE_GETBIT(i);
return 0;
error:
BUG_MSG("Given page area is out of system page_map range: 0x%lx\n",
pfn_err << PAGE_BITS);
return -1;
}
/* Describes physical memory boundaries of the system. */
struct memdesc physmem;
/* Fills in the physmem structure with free physical memory information */
void physmem_init()
{
unsigned long start = (unsigned long)_start_kernel;
unsigned long end = (unsigned long)_end_kernel;
/* Initialise page map */
init_page_map(PHYS_MEM_START, PHYS_MEM_END);
/* Mark kernel areas as used */
set_page_map(virt_to_phys(start), __pfn(end - start), 1);
/* Map initial pgd area as used */
start = (unsigned long)__pt_start;
end = (unsigned long)__pt_end;
set_page_map(virt_to_phys(current->pgd), __pfn(end - start), 1);
physmem.start = PHYS_MEM_START;
physmem.end = PHYS_MEM_END;
physmem.free_cur = __svc_images_end;
physmem.free_end = PHYS_MEM_END;
physmem.numpages = (PHYS_MEM_START - PHYS_MEM_END) / PAGE_SIZE;
}
void memory_init()
{
printascii("Initialising kernel memory allocator.\n");
init_pgalloc();
}