/**
* Examine address space, create virtual physical memory and map it.
*/
static void
page_init (void)
{
int i;
int freemem_size = 0;
/* Construct page descriptor table.
* mem => memory not reserved or occupied by kernel code
* freemem => memory available after page descriptor table is built
*/
/* all pages from 0x100000 to the top should have an entry in page descriptor table */
for (i = 0; i < e820map.nr_map; i++) {
mem_size += (uint32_t)(e820map.map[i].size);
if (e820map.map[i].type == E820_ARM)
freemem_size += e820map.map[i].size;
}
pages = (struct Page *)(uint32_t)(e820map.map[e820map.nr_map-1].addr);
npage = (mem_size) / PGSIZE;
for (i = 0; i < npage; i++) {
SetPageReserved (pages + i);
}
uintptr_t freemem = PADDR(ROUNDUP((uintptr_t)pages + sizeof(struct Page) * npage, PGSIZE));
uint32_t freemem_npage = freemem_size / PGSIZE - npage * sizeof (struct Page) / PGSIZE;
init_memmap(pa2page(freemem), freemem_npage);
}
static void
page_init(void) {
int i;
/* struct e820map *memmap = (struct e820map *)0x0; */
/* uint32_t maxpa = 0; */
/* kprintf("e820map:\n"); */
/* int i; */
/* for (i = 0; i < memmap->nr_map; i ++) { */
/* uint64_t begin = memmap->map[i].addr, end = begin + memmap->map[i].size; */
/* kprintf(" memory: %08llx, [%08llx, %08llx], type = %d.\n", */
/* memmap->map[i].size, begin, end - 1, memmap->map[i].type); */
/* if (memmap->map[i].type == E820_ARM) { */
/* if (maxpa < end && begin < KMEMSIZE) { */
/* maxpa = end; */
/* } */
/* } */
/* } */
/* if (maxpa > KMEMSIZE) { */
/* maxpa = KMEMSIZE; */
/* } */
extern char end[];
npage = RAM_SIZE / PGSIZE;
pages = (struct Page *)ROUNDUP((void *)end, PGSIZE);
for (i = 0; i < npage; i ++) {
SetPageReserved(pages + i);
}
uintptr_t freemem = PADDR((uintptr_t)pages + sizeof(struct Page) * npage);
uint32_t free_begin = ROUNDUP(freemem, PGSIZE), free_end = RAM_SIZE;
init_memmap (pa2page(free_begin), (free_end - free_begin) / PGSIZE);
kprintf ("free memory: [0x%x, 0x%x)\n", free_begin, free_end);
/* for (i = 0; i < memmap->nr_map; i ++) { */
/* uint64_t begin = memmap->map[i].addr, end = begin + memmap->map[i].size; */
/* if (memmap->map[i].type == E820_ARM) { */
/* if (begin < freemem) { */
/* begin = freemem; */
/* } */
/* if (end > KMEMSIZE) { */
/* end = KMEMSIZE; */
/* } */
/* if (begin < end) { */
/* begin = ROUNDUP(begin, PGSIZE); */
/* end = ROUNDDOWN(end, PGSIZE); */
/* if (begin < end) { */
/* init_memmap(pa2page(begin), (end - begin) / PGSIZE); */
/* } */
/* } */
/* } */
/* } */
}
/* pmm_init - initialize the physical memory management */
static void page_init(void)
{
struct e820map *memmap = (struct e820map *)(0x8000 + KERNBASE);
uint64_t maxpa = 0;
kprintf("e820map:\n");
int i;
for (i = 0; i < memmap->nr_map; i++) {
uint64_t begin = memmap->map[i].addr, end =
begin + memmap->map[i].size;
kprintf(" memory: %08llx, [%08llx, %08llx], type = %d.\n",
memmap->map[i].size, begin, end - 1,
memmap->map[i].type);
if (memmap->map[i].type == E820_ARM) {
if (maxpa < end && begin < KMEMSIZE) {
maxpa = end;
}
}
}
if (maxpa > KMEMSIZE) {
maxpa = KMEMSIZE;
}
extern char end[];
npage = maxpa / PGSIZE;
pages = (struct Page *)ROUNDUP((void *)end, PGSIZE);
for (i = 0; i < npage; i++) {
SetPageReserved(pages + i);
}
uintptr_t freemem =
PADDR((uintptr_t) pages + sizeof(struct Page) * npage);
for (i = 0; i < memmap->nr_map; i++) {
uint64_t begin = memmap->map[i].addr, end =
begin + memmap->map[i].size;
if (memmap->map[i].type == E820_ARM) {
if (begin < freemem) {
begin = freemem;
}
if (end > KMEMSIZE) {
end = KMEMSIZE;
}
if (begin < end) {
begin = ROUNDUP(begin, PGSIZE);
end = ROUNDDOWN(end, PGSIZE);
if (begin < end) {
init_memmap(pa2page(begin),
(end - begin) / PGSIZE);
}
}
}
}
}
void main(int argc, char * argv[])
{
//Set up gpio to be pointer to chunk of memory that includes I/O.
//gets around virtual memory issues too.
gpio=init_memmap();
set_dir(38,OUT);
while(1)
{
set_pin(38);
clear_pin(38);
}
}
/* pmm_init - initialize the physical memory management */
static void
page_init(void) {
extern char realend[];
struct e820map *memmap = (struct e820map *)(0xf0000000);
memmap->nr_map=1;
memmap->map[0].type=E820_ARM;
memmap->map[0].size=KMEMSIZE;
memmap->map[0].addr=realend;
uint32_t maxpa = 0;
//cprintf("KMEMSIZE=%x\n",KMEMSIZE);
cprintf("e820map:\n");
int i;
for (i = 0; i < memmap->nr_map; i ++) {
uint64_t begin = memmap->map[i].addr, end = begin + memmap->map[i].size;
cprintf(" memory: %08llx, [%08llx, %08llx], type = %d.\n",
memmap->map[i].size, begin, end - 1, memmap->map[i].type);
if (memmap->map[i].type == E820_ARM) {
if (maxpa < end && begin < KMEMSIZE) {
//cprintf("end")
maxpa = end;
}
}
}
if (maxpa > KMEMSIZE) {
maxpa = KMEMSIZE;
}
//cprintf("maxpa=%x\n",maxpa);
//extern char end[];
npage = maxpa / PGSIZE;
pages = (struct Page *)ROUNDUP((void *)realend, PGSIZE);
//cprintf("npage=%d\n",npage);
for (i = 0; i < npage; i ++) {
SetPageReserved(pages + i);
}
uintptr_t freemem = PADDR((uintptr_t)pages + sizeof(struct Page) * npage);
cprintf("realend=%08x,freemem=%08x\n",realend,freemem);
for (i = 0; i < memmap->nr_map; i ++) {
uint32_t begin = memmap->map[i].addr, end = begin + memmap->map[i].size;
if (memmap->map[i].type == E820_ARM) {
if (begin < freemem) {
begin = freemem;
}
if (end > KMEMSIZE) {
end = KMEMSIZE;
}
if (begin < end) {
begin = ROUNDUP(begin, PGSIZE);
end = ROUNDDOWN(end, PGSIZE);
if (begin < end) {
init_memmap(pa2page(begin), (end - begin) / PGSIZE);
}//default_pmm_manager
}
}
}
//struct Page* pg=alloc_page();
//cprintf("pg=%08x\n",page2pa(pg));
}
