// start_pfn : 뱅크 0 시작 주소의 물리 small page 번호 (0x20000)
// end_pfn : 뱅크 0의 마지막 주소의 물리 small page 번호 (0x4f800)
static void __init arm_bootmem_init(unsigned long start_pfn,
unsigned long end_pfn)
{
struct memblock_region *reg;
unsigned int boot_pages;
phys_addr_t bitmap;
pg_data_t *pgdat;
// pg_data_t : struct pglist_data
/*
* Allocate the bootmem bitmap page. This must be in a region
* of memory which has already been mapped.
*/
boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
// boot_pages : 6
// start_pfn ~ end_pfn 까지를 bitmap으로 바꿨을 때 총 프레임의 갯수가 반환됨.
// boot_pages << PAGE_SHIFT : 0x6000, L1_CACHE_BYTES : 64, _pfn_to_phys(end_pfn) : 0x4F800000
bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
__pfn_to_phys(end_pfn));
// non-reserved 영역에서 비트맵용 영역을 만들어 가져옴
// 영역의 시작 주소가 반환됨(물리)
/*
* Initialise the bootmem allocator, handing the
* memory banks over to bootmem.
*/
node_set_online(0); // 비어 있는 함수임
pgdat = NODE_DATA(0);
//*pgdat = contig_page_data
//
// .bdata = &bootmem_node_data[0]
// 현재는 0으로 되어 있는 값임
//
init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
// bdata_list 에 등록
// bitmap 값을 0xFF로 초기화
/* Free the lowmem regions from memblock into bootmem. */
for_each_memblock(memory, reg) {
// for (reg = memblock.memory.regions; reg < (memblock.memory.regions + memblock.memory.cnt), reg++)
unsigned long start = memblock_region_memory_base_pfn(reg);
unsigned long end = memblock_region_memory_end_pfn(reg);
// start : 0x20000
// end : 0xA0000
if (end >= end_pfn)
end = end_pfn;
if (start >= end)
break;
// start : 0x20000000, (end - start) << PAGE_SHIFT : 0x2F800000
free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
// start부터 end에 해당하는 bitmap을 전부 0으로 설정
// 일단 전부 FREE로 만듬
}
static void __init contig_initmem_init(void)
{
unsigned long bootmap_size, bootmap;
bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n",bootmap_size);
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
e820_bootmem_free(&contig_page_data, 0, end_pfn << PAGE_SHIFT);
reserve_bootmem(bootmap, bootmap_size);
}
static void __init bootmem_init_one_node(unsigned int nid)
{
unsigned long total_pages, paddr;
unsigned long end_pfn;
struct pglist_data *p;
p = NODE_DATA(nid);
/* Nothing to do.. */
if (!p->node_spanned_pages)
return;
end_pfn = p->node_start_pfn + p->node_spanned_pages;
#ifdef CONFIG_HIGHMEM
if (end_pfn > max_low_pfn)
end_pfn = max_low_pfn;
#endif
total_pages = bootmem_bootmap_pages(end_pfn - p->node_start_pfn);
paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
if (!paddr)
panic("Can't allocate bootmap for nid[%d]\n", nid);
init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/*
* XXX Handle initial reservations for the system memory node
* only for the moment, we'll refactor this later for handling
* reservations in other nodes.
*/
if (nid == 0) {
struct memblock_region *reg;
/* Reserve the sections we're already using. */
for_each_memblock(reserved, reg) {
unsigned long size = reg->size;
#ifdef CONFIG_HIGHMEM
/* ...but not highmem */
if (PFN_DOWN(reg->base) >= highstart_pfn)
continue;
if (PFN_UP(reg->base + size) > highstart_pfn)
size = (highstart_pfn - PFN_DOWN(reg->base))
<< PAGE_SHIFT;
#endif
reserve_bootmem(reg->base, size, BOOTMEM_DEFAULT);
}
}
static void __init
contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long bootmap_size, bootmap;
bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n",bootmap_size);
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
e820_bootmem_free(NODE_DATA(0), 0, end_pfn << PAGE_SHIFT);
reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
}
// ARM10C 20131207
// min: 0x20000, max_low: 0x4f800
static void __init arm_bootmem_init(unsigned long start_pfn,
unsigned long end_pfn)
{
struct memblock_region *reg;
unsigned int boot_pages;
phys_addr_t bitmap;
pg_data_t *pgdat;
/*
* Allocate the bootmem bitmap page. This must be in a region
* of memory which has already been mapped.
*/
// start_pfn: 0x20000, end_pfn: 0x4f800, end_pfn - start_pfn: 0x2f800
// boot_pages: 0x6
boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
// boot_pages << PAGE_SHIFT: 0x6000, L1_CACHE_BYTES: 64
// __pfn_to_phys(0x4f800); 0x4f800000
bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
__pfn_to_phys(end_pfn));
/*
* Initialise the bootmem allocator, handing the
* memory banks over to bootmem.
*/
node_set_online(0);
// pglist_data.bdata 의 bootmem_node_data 주소로 설정
pgdat = NODE_DATA(0);
// pgdat: ?, __phys_to_pfn(bitmap): ?, start_pfn: 0x20000, end_pfn: 0x4f800
init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
/* Free the lowmem regions from memblock into bootmem. */
for_each_memblock(memory, reg) {
// start: 0x20000
unsigned long start = memblock_region_memory_base_pfn(reg);
// end: 0xA0000
unsigned long end = memblock_region_memory_end_pfn(reg);
// end: 0xA0000, end_pfn: 0x4f800
if (end >= end_pfn)
// end: 0x4f800
end = end_pfn;
// start: 0x20000, end: 0x4f800
if (start >= end)
break;
// __pfn_to_phys(0x20000): 0x20000000, (end - start) << PAGE_SHIFT: 0x2f800000
free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
}
void __init do_init_bootmem(void)
{
unsigned long i;
unsigned long start, bootmap_pages;
unsigned long total_pages;
int boot_mapsize;
max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
total_pages = total_lowmem >> PAGE_SHIFT;
#endif
/*
* Find an area to use for the bootmem bitmap. Calculate the size of
* bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
* Add 1 additional page in case the address isn't page-aligned.
*/
bootmap_pages = bootmem_bootmap_pages(total_pages);
start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
/* Add active regions with valid PFNs */
for (i = 0; i < lmb.memory.cnt; i++) {
unsigned long start_pfn, end_pfn;
start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
add_active_range(0, start_pfn, end_pfn);
}
/* Add all physical memory to the bootmem map, mark each area
* present.
*/
#ifdef CONFIG_HIGHMEM
free_bootmem_with_active_regions(0, total_lowmem >> PAGE_SHIFT);
#else
free_bootmem_with_active_regions(0, max_pfn);
#endif
/* reserve the sections we're already using */
for (i = 0; i < lmb.reserved.cnt; i++)
reserve_bootmem(lmb.reserved.region[i].base,
lmb_size_bytes(&lmb.reserved, i));
/* XXX need to clip this if using highmem? */
sparse_memory_present_with_active_regions(0);
init_bootmem_done = 1;
}
void __init do_init_bootmem(void)
{
unsigned long i;
unsigned long start, bootmap_pages;
unsigned long total_pages;
int boot_mapsize;
max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
total_pages = total_lowmem >> PAGE_SHIFT;
#endif
/*
* Find an area to use for the bootmem bitmap. Calculate the size of
* bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
* Add 1 additional page in case the address isn't page-aligned.
*/
bootmap_pages = bootmem_bootmap_pages(total_pages);
start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
BUG_ON(!start);
boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
/* Add all physical memory to the bootmem map, mark each area
* present.
*/
for (i = 0; i < lmb.memory.cnt; i++) {
unsigned long base = lmb.memory.region[i].base;
unsigned long size = lmb_size_bytes(&lmb.memory, i);
#ifdef CONFIG_HIGHMEM
if (base >= total_lowmem)
continue;
if (base + size > total_lowmem)
size = total_lowmem - base;
#endif
free_bootmem(base, size);
}
/* reserve the sections we're already using */
for (i = 0; i < lmb.reserved.cnt; i++)
reserve_bootmem(lmb.reserved.region[i].base,
lmb_size_bytes(&lmb.reserved, i));
/* XXX need to clip this if using highmem? */
for (i = 0; i < lmb.memory.cnt; i++)
memory_present(0, lmb_start_pfn(&lmb.memory, i),
lmb_end_pfn(&lmb.memory, i));
init_bootmem_done = 1;
}
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
unsigned long bootmap_pages;
unsigned long start_pfn, end_pfn;
unsigned long bootmem_paddr;
/* Don't allow bogus node assignment */
BUG_ON(nid > MAX_NUMNODES || nid <= 0);
start_pfn = start >> PAGE_SHIFT;
end_pfn = end >> PAGE_SHIFT;
pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
PAGE_KERNEL);
lmb_add(start, end - start);
__add_active_range(nid, start_pfn, end_pfn);
/* Node-local pgdat */
NODE_DATA(nid) = __va(lmb_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES, end));
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
/* Node-local bootmap */
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bootmem_paddr = lmb_alloc_base(bootmap_pages << PAGE_SHIFT,
PAGE_SIZE, end);
init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/* Reserve the pgdat and bootmap space with the bootmem allocator */
reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
sizeof(struct pglist_data), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
/* It's up */
node_set_online(nid);
/* Kick sparsemem */
sparse_memory_present_with_active_regions(nid);
}
/**
* This sets up the bootstrap memory allocator. It is a simple
* bitmap based allocator that tracks memory at a page granularity.
* Once the bootstrap process is complete, each unallocated page
* is added to the real memory allocator's free pool. Memory allocated
* during bootstrap remains allocated forever, unless explicitly
* freed before turning things over to the real memory allocator.
*/
static void __init
setup_bootmem_allocator(
unsigned long start_pfn,
unsigned long end_pfn
)
{
unsigned long bootmap_size, bootmap;
bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n",bootmap_size);
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
e820_bootmem_free(0, end_pfn << PAGE_SHIFT);
reserve_bootmem(bootmap, bootmap_size);
}
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
unsigned long bootmap_pages, bootmap_start, bootmap_size;
unsigned long start_pfn, free_pfn, end_pfn;
/* Don't allow bogus node assignment */
BUG_ON(nid > MAX_NUMNODES || nid == 0);
/*
* The free pfn starts at the beginning of the range, and is
* advanced as necessary for pgdat and node map allocations.
*/
free_pfn = start_pfn = start >> PAGE_SHIFT;
end_pfn = end >> PAGE_SHIFT;
__add_active_range(nid, start_pfn, end_pfn);
/* Node-local pgdat */
NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
free_pfn += PFN_UP(sizeof(struct pglist_data));
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
/* Node-local bootmap */
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/* Reserve the pgdat and bootmap space with the bootmem allocator */
reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
sizeof(struct pglist_data), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
/* It's up */
node_set_online(nid);
/* Kick sparsemem */
sparse_memory_present_with_active_regions(nid);
}
static void __init
contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long bootmap_size, bootmap;
bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n",bootmap_size);
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
#ifdef CONFIG_XEN
e820_bootmem_free(NODE_DATA(0), 0, xen_start_info->nr_pages<<PAGE_SHIFT);
#else
e820_bootmem_free(NODE_DATA(0), 0, end_pfn << PAGE_SHIFT);
#endif
reserve_bootmem(bootmap, bootmap_size);
}
static void __init arm_bootmem_init(struct meminfo *mi,
unsigned long start_pfn, unsigned long end_pfn)
{
unsigned int boot_pages;
phys_addr_t bitmap;
pg_data_t *pgdat;
int i;
/*
* Allocate the bootmem bitmap page. This must be in a region
* of memory which has already been mapped.
*/
boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
__pfn_to_phys(end_pfn));
/*
* Initialise the bootmem allocator, handing the
* memory banks over to bootmem.
*/
node_set_online(0);
pgdat = NODE_DATA(0);
init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
for_each_bank(i, mi) {
struct membank *bank = &mi->bank[i];
if (!bank->highmem)
free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
}
/*
* Reserve the memblock reserved regions in bootmem.
*/
for (i = 0; i < memblock.reserved.cnt; i++) {
phys_addr_t start = memblock_start_pfn(&memblock.reserved, i);
if (start >= start_pfn &&
memblock_end_pfn(&memblock.reserved, i) <= end_pfn)
reserve_bootmem_node(pgdat, __pfn_to_phys(start),
memblock_size_bytes(&memblock.reserved, i),
BOOTMEM_DEFAULT);
}
}
static void __init bootmem_init_one_node(unsigned int nid)
{
unsigned long total_pages, paddr;
unsigned long end_pfn;
struct pglist_data *p;
p = NODE_DATA(nid);
/* Nothing to do.. */
if (!p->node_spanned_pages)
return;
end_pfn = p->node_start_pfn + p->node_spanned_pages;
total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
if (!paddr)
panic("Can't allocate bootmap for nid[%d]\n", nid);
init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/*
* XXX Handle initial reservations for the system memory node
* only for the moment, we'll refactor this later for handling
* reservations in other nodes.
*/
if (nid == 0) {
struct memblock_region *reg;
/* Reserve the sections we're already using. */
for_each_memblock(reserved, reg) {
reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
}
}
static void __init arm_bootmem_init(unsigned long start_pfn,
unsigned long end_pfn)
{
struct memblock_region *reg;
unsigned int boot_pages;
phys_addr_t bitmap;
pg_data_t *pgdat;
/*
* Allocate the bootmem bitmap page. This must be in a region
* of memory which has already been mapped.
*/
boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
__pfn_to_phys(end_pfn));
/*
* Initialise the bootmem allocator, handing the
* memory banks over to bootmem.
*/
node_set_online(0);
pgdat = NODE_DATA(0);
init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
/* Free the lowmem regions from memblock into bootmem. */
for_each_memblock(memory, reg) {
unsigned long start = memblock_region_memory_base_pfn(reg);
unsigned long end = memblock_region_memory_end_pfn(reg);
if (end >= end_pfn)
end = end_pfn;
if (start >= end)
break;
free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
}
static void __init
setup_memory(void)
{
unsigned long bootmap_size;
unsigned long start_pfn, end_pfn;
int i;
/*
* partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(&_end));
end_pfn = max_pfn = PFN_DOWN(memory_end);
#ifdef CONFIG_BLK_DEV_INITRD
/*
* Move the initrd in case the bitmap of the bootmem allocater
* would overwrite it.
*/
if (INITRD_START && INITRD_SIZE) {
unsigned long bmap_size;
unsigned long start;
bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
bmap_size = PFN_PHYS(bmap_size);
if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
if (start + INITRD_SIZE > memory_end) {
pr_err("initrd extends beyond end of "
"memory (0x%08lx > 0x%08lx) "
"disabling initrd\n",
start + INITRD_SIZE, memory_end);
INITRD_START = INITRD_SIZE = 0;
} else {
pr_info("Moving initrd (0x%08lx -> "
"0x%08lx, size: %ld)\n",
INITRD_START, start, INITRD_SIZE);
memmove((void *) start, (void *) INITRD_START,
INITRD_SIZE);
INITRD_START = start;
}
}
}
#endif
/*
* Initialize the boot-time allocator
*/
bootmap_size = init_bootmem(start_pfn, end_pfn);
/*
* Register RAM areas with the bootmem allocator.
*/
for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
unsigned long start_chunk, end_chunk, pfn;
if (memory_chunk[i].type != CHUNK_READ_WRITE)
continue;
start_chunk = PFN_DOWN(memory_chunk[i].addr);
end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
end_chunk = min(end_chunk, end_pfn);
if (start_chunk >= end_chunk)
continue;
add_active_range(0, start_chunk, end_chunk);
pfn = max(start_chunk, start_pfn);
for (; pfn < end_chunk; pfn++)
page_set_storage_key(PFN_PHYS(pfn),
PAGE_DEFAULT_KEY, 0);
}
psw_set_key(PAGE_DEFAULT_KEY);
free_bootmem_with_active_regions(0, max_pfn);
/*
* Reserve memory used for lowcore/command line/kernel image.
*/
reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
reserve_bootmem((unsigned long)_stext,
PFN_PHYS(start_pfn) - (unsigned long)_stext,
BOOTMEM_DEFAULT);
/*
* Reserve the bootmem bitmap itself as well. We do this in two
* steps (first step was init_bootmem()) because this catches
* the (very unlikely) case of us accidentally initializing the
* bootmem allocator with an invalid RAM area.
*/
reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
BOOTMEM_DEFAULT);
#ifdef CONFIG_BLK_DEV_INITRD
if (INITRD_START && INITRD_SIZE) {
if (INITRD_START + INITRD_SIZE <= memory_end) {
reserve_bootmem(INITRD_START, INITRD_SIZE,
BOOTMEM_DEFAULT);
initrd_start = INITRD_START;
initrd_end = initrd_start + INITRD_SIZE;
} else {
pr_err("initrd extends beyond end of "
"memory (0x%08lx > 0x%08lx) "
"disabling initrd\n",
initrd_start + INITRD_SIZE, memory_end);
initrd_start = initrd_end = 0;
}
}
#endif
}