unsigned long __init setup_memory(void)
{
unsigned long bootmap_size;
unsigned long min_pfn;
int nid;
mem_prof_t *mp;
max_low_pfn = 0;
min_low_pfn = -1;
mem_prof_init();
for_each_online_node(nid) {
mp = &mem_prof[nid];
NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
min_pfn = mp->start_pfn;
max_pfn = mp->start_pfn + mp->pages;
bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
mp->start_pfn, max_pfn);
free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
PFN_PHYS(mp->pages));
reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
BOOTMEM_DEFAULT);
if (max_low_pfn < max_pfn)
max_low_pfn = max_pfn;
if (min_low_pfn > min_pfn)
min_low_pfn = min_pfn;
}
#ifdef CONFIG_BLK_DEV_INITRD
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
reserve_bootmem_node(NODE_DATA(0), INITRD_START,
INITRD_SIZE, BOOTMEM_DEFAULT);
initrd_start = INITRD_START + PAGE_OFFSET;
initrd_end = initrd_start + INITRD_SIZE;
printk("initrd:start[%08lx],size[%08lx]\n",
initrd_start, INITRD_SIZE);
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08llx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
(unsigned long long)PFN_PHYS(max_low_pfn));
initrd_start = 0;
}
}
#endif /* CONFIG_BLK_DEV_INITRD */
return max_low_pfn;
}
// 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
}
// 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 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 bootmem_init(void)
{
unsigned long start_pfn, bootmap_size;
unsigned long size = initrd_end - initrd_start;
start_pfn = PFN_UP(__pa(&_end));
min_low_pfn = PFN_UP(MEMORY_START);
max_low_pfn = PFN_UP(MEMORY_START + MEMORY_SIZE);
/* Initialize the boot-time allocator with low memory only. */
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
min_low_pfn, max_low_pfn);
add_active_range(0, min_low_pfn, max_low_pfn);
free_bootmem(PFN_PHYS(start_pfn),
(max_low_pfn - start_pfn) << PAGE_SHIFT);
memory_present(0, start_pfn, max_low_pfn);
/* Reserve space for the bootmem bitmap. */
reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
if (size == 0) {
printk(KERN_INFO "Initrd not found or empty");
goto disable;
}
if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
printk(KERN_ERR "Initrd extends beyond end of memory");
goto disable;
}
/* Reserve space for the initrd bitmap. */
reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
initrd_below_start_ok = 1;
pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
initrd_start, size);
return;
disable:
printk(KERN_CONT " - disabling initrd\n");
initrd_start = 0;
initrd_end = 0;
}
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 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 bootmem_init(void)
{
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
/*
* Init any data related to initrd. It's a nop if INITRD is
* not selected. Once that done we can determine the low bound
* of usable memory.
*/
reserved_end = max(init_initrd(),
(unsigned long) PFN_UP(__pa_symbol(&_end)));
/*
* max_low_pfn is not a number of pages. The number of pages
* of the system is given by 'max_low_pfn - min_low_pfn'.
*/
min_low_pfn = ~0UL;
max_low_pfn = 0;
/*
* Find the highest page frame number we have available.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (end > max_low_pfn)
max_low_pfn = end;
if (start < min_low_pfn)
min_low_pfn = start;
if (end <= reserved_end)
continue;
if (start >= mapstart)
continue;
mapstart = max(reserved_end, start);
}
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
min_low_pfn - ARCH_PFN_OFFSET);
} else if (min_low_pfn < ARCH_PFN_OFFSET) {
pr_info("%lu free pages won't be used\n",
ARCH_PFN_OFFSET - min_low_pfn);
}
min_low_pfn = ARCH_PFN_OFFSET;
/*
* Determine low and high memory ranges
*/
max_pfn = max_low_pfn;
if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
highstart_pfn = PFN_DOWN(HIGHMEM_START);
highend_pfn = max_low_pfn;
#endif
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
/*
* Initialize the boot-time allocator with low memory only.
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (start <= min_low_pfn)
start = min_low_pfn;
if (start >= end)
continue;
#ifndef CONFIG_HIGHMEM
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
#endif
add_active_range(0, start, end);
}
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end, size;
/*
* Reserve usable memory.
*/
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
/*
* We are rounding up the start address of usable memory
* and at the end of the usable range downwards.
*/
if (start >= max_low_pfn)
continue;
if (start < reserved_end)
start = reserved_end;
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
size = end - start;
/* Register lowmem ranges */
#ifdef CONFIG_BRCMSTB
/* carve out space for bmem */
brcm_free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
#else
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
#endif
}
/*
* Reserve the bootmap memory.
*/
reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
/*
* Reserve initrd memory if needed.
*/
finalize_initrd();
/*
* Call memory_present() on all valid ranges, for SPARSEMEM.
* This must be done after setting up bootmem, since memory_present()
* may allocate bootmem.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
memory_present(0, start, end);
}
}
void __init setup_arch(char **cmdline_p)
{
#if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
extern struct sh_machine_vector mv_unknown;
#endif
struct sh_machine_vector *mv = NULL;
char mv_name[MV_NAME_SIZE] = "";
unsigned long mv_io_base = 0;
int mv_mmio_enable = 0;
unsigned long bootmap_size;
unsigned long start_pfn, max_pfn, max_low_pfn;
#ifdef CONFIG_SH_EARLY_PRINTK
sh_console_init();
#endif
ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);
#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
if (!MOUNT_ROOT_RDONLY)
root_mountflags &= ~MS_RDONLY;
init_mm.start_code = (unsigned long)&_text;
init_mm.end_code = (unsigned long) &_etext;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
code_resource.start = virt_to_bus(&_text);
code_resource.end = virt_to_bus(&_etext)-1;
data_resource.start = virt_to_bus(&_etext);
data_resource.end = virt_to_bus(&_edata)-1;
parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);
#ifdef CONFIG_CMDLINE_BOOL
sprintf(*cmdline_p, CONFIG_CMDLINE);
#endif
#ifdef CONFIG_SH_GENERIC
if (mv == NULL) {
mv = &mv_unknown;
if (*mv_name != '\0') {
printk("Warning: Unsupported machine %s, using unknown\n",
mv_name);
}
}
sh_mv = *mv;
#endif
#ifdef CONFIG_SH_UNKNOWN
sh_mv = mv_unknown;
#endif
#if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
if (mv_io_base != 0) {
sh_mv.mv_inb = generic_inb;
sh_mv.mv_inw = generic_inw;
sh_mv.mv_inl = generic_inl;
sh_mv.mv_outb = generic_outb;
sh_mv.mv_outw = generic_outw;
sh_mv.mv_outl = generic_outl;
sh_mv.mv_inb_p = generic_inb_p;
sh_mv.mv_inw_p = generic_inw_p;
sh_mv.mv_inl_p = generic_inl_p;
sh_mv.mv_outb_p = generic_outb_p;
sh_mv.mv_outw_p = generic_outw_p;
sh_mv.mv_outl_p = generic_outl_p;
sh_mv.mv_insb = generic_insb;
sh_mv.mv_insw = generic_insw;
sh_mv.mv_insl = generic_insl;
sh_mv.mv_outsb = generic_outsb;
sh_mv.mv_outsw = generic_outsw;
sh_mv.mv_outsl = generic_outsl;
sh_mv.mv_isa_port2addr = generic_isa_port2addr;
generic_io_base = mv_io_base;
}
if (mv_mmio_enable != 0) {
sh_mv.mv_readb = generic_readb;
sh_mv.mv_readw = generic_readw;
sh_mv.mv_readl = generic_readl;
sh_mv.mv_writeb = generic_writeb;
sh_mv.mv_writew = generic_writew;
sh_mv.mv_writel = generic_writel;
}
#endif
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
#ifdef CONFIG_DISCONTIGMEM
NODE_DATA(0)->bdata = &discontig_node_bdata[0];
NODE_DATA(1)->bdata = &discontig_node_bdata[1];
bootmap_size = init_bootmem_node(NODE_DATA(1),
PFN_UP(__MEMORY_START_2ND),
PFN_UP(__MEMORY_START_2ND),
PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND));
free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND);
reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size);
#endif
/*
* Find the highest page frame number we have available
*/
max_pfn = PFN_DOWN(__pa(memory_end));
/*
* Determine low and high memory ranges:
*/
max_low_pfn = max_pfn;
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(&_end));
/*
* Find a proper area for the bootmem bitmap. After this
* bootstrap step all allocations (until the page allocator
* is intact) must be done via bootmem_alloc().
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
__MEMORY_START>>PAGE_SHIFT,
max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
{
unsigned long curr_pfn, last_pfn, pages;
/*
* We are rounding up the start address of usable memory:
*/
curr_pfn = PFN_UP(__MEMORY_START);
/*
* ... and at the end of the usable range downwards:
*/
last_pfn = PFN_DOWN(__pa(memory_end));
if (last_pfn > max_low_pfn)
last_pfn = max_low_pfn;
pages = last_pfn - curr_pfn;
free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
PFN_PHYS(pages));
}
/*
* Reserve the kernel text and
* Reserve the bootmem bitmap. We do this in two steps (first step
* was init_bootmem()), because this catches the (definitely buggy)
* case of us accidentally initializing the bootmem allocator with
* an invalid RAM area.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
#ifdef CONFIG_BLK_DEV_INITRD
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
initrd_start =
INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
initrd_end = initrd_start + INITRD_SIZE;
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
max_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
}
#endif
#if 0
/*
* Request the standard RAM and ROM resources -
* they eat up PCI memory space
*/
request_resource(&iomem_resource, ram_resources+0);
request_resource(&iomem_resource, ram_resources+1);
request_resource(&iomem_resource, ram_resources+2);
request_resource(ram_resources+1, &code_resource);
request_resource(ram_resources+1, &data_resource);
probe_roms();
/* request I/O space for devices used on all i[345]86 PCs */
for (i = 0; i < STANDARD_IO_RESOURCES; i++)
request_resource(&ioport_resource, standard_io_resources+i);
#endif
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
/* Perform the machine specific initialisation */
if (sh_mv.mv_init_arch != NULL) {
sh_mv.mv_init_arch();
}
#if defined(__SH4__)
init_task.used_math = 0;
init_task.flags &= ~PF_USEDFPU;
#endif
#ifdef CONFIG_UBC_WAKEUP
/*
* Some brain-damaged loaders decided it would be a good idea to put
* the UBC to sleep. This causes some issues when it comes to things
* like PTRACE_SINGLESTEP or doing hardware watchpoints in GDB. So ..
* we wake it up and hope that all is well.
*/
ubc_wakeup();
#endif
paging_init();
}
void __init setup_arch(char **cmdline_p)
{
int bootmap_size;
memory_start = PAGE_ALIGN(_ramstart);
memory_end = _ramend;
init_mm.start_code = (unsigned long) &_stext;
init_mm.end_code = (unsigned long) &_etext;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) 0;
config_BSP(&command_line[0], sizeof(command_line));
#if defined(CONFIG_BOOTPARAM)
strncpy(&command_line[0], CONFIG_BOOTPARAM_STRING, sizeof(command_line));
command_line[sizeof(command_line) - 1] = 0;
#endif /* CONFIG_BOOTPARAM */
process_uboot_commandline(&command_line[0], sizeof(command_line));
pr_info("uClinux with CPU " CPU_NAME "\n");
#ifdef CONFIG_UCDIMM
pr_info("uCdimm by Lineo, Inc. <www.lineo.com>\n");
#endif
#ifdef CONFIG_M68VZ328
pr_info("M68VZ328 support by Evan Stawnyczy <*****@*****.**>\n");
#endif
#ifdef CONFIG_COLDFIRE
pr_info("COLDFIRE port done by Greg Ungerer, [email protected]\n");
#ifdef CONFIG_M5307
pr_info("Modified for M5307 by Dave Miller, [email protected]\n");
#endif
#ifdef CONFIG_ELITE
pr_info("Modified for M5206eLITE by Rob Scott, [email protected]\n");
#endif
#endif
pr_info("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
#if defined( CONFIG_PILOT ) && defined( CONFIG_M68328 )
pr_info("TRG SuperPilot FLASH card support <*****@*****.**>\n");
#endif
#if defined( CONFIG_PILOT ) && defined( CONFIG_M68EZ328 )
pr_info("PalmV support by Lineo Inc. <*****@*****.**>\n");
#endif
#ifdef CONFIG_DRAGEN2
pr_info("DragonEngine II board support by Georges Menie\n");
#endif
#ifdef CONFIG_M5235EVB
pr_info("Motorola M5235EVB support (C)2005 Syn-tech Systems, Inc. (Jate Sujjavanich)\n");
#endif
pr_debug("KERNEL -> TEXT=0x%p-0x%p DATA=0x%p-0x%p BSS=0x%p-0x%p\n",
_stext, _etext, _sdata, _edata, __bss_start, __bss_stop);
pr_debug("MEMORY -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx\n ",
__bss_stop, memory_start, memory_start, memory_end);
/* Keep a copy of command line */
*cmdline_p = &command_line[0];
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
boot_command_line[COMMAND_LINE_SIZE-1] = 0;
#if defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
/*
* Give all the memory to the bootmap allocator, tell it to put the
* boot mem_map at the start of memory.
*/
min_low_pfn = PFN_DOWN(memory_start);
max_pfn = max_low_pfn = PFN_DOWN(memory_end);
bootmap_size = init_bootmem_node(
NODE_DATA(0),
min_low_pfn, /* map goes here */
PFN_DOWN(PAGE_OFFSET),
max_pfn);
/*
* Free the usable memory, we have to make sure we do not free
* the bootmem bitmap so we then reserve it after freeing it :-)
*/
free_bootmem(memory_start, memory_end - memory_start);
reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
#if defined(CONFIG_UBOOT) && defined(CONFIG_BLK_DEV_INITRD)
if ((initrd_start > 0) && (initrd_start < initrd_end) &&
(initrd_end < memory_end))
reserve_bootmem(initrd_start, initrd_end - initrd_start,
BOOTMEM_DEFAULT);
#endif /* if defined(CONFIG_BLK_DEV_INITRD) */
/*
* Get kmalloc into gear.
*/
paging_init();
}
void __init setup_arch(char **cmdline_p)
{
extern void init_etrax_debug(void);
unsigned long bootmap_size;
unsigned long start_pfn, max_pfn;
unsigned long memory_start;
/* register an initial console printing routine for printk's */
init_etrax_debug();
/* we should really poll for DRAM size! */
high_memory = &dram_end;
if(romfs_in_flash || !romfs_length) {
/* if we have the romfs in flash, or if there is no rom filesystem,
* our free area starts directly after the BSS
*/
memory_start = (unsigned long) &_end;
} else {
/* otherwise the free area starts after the ROM filesystem */
printk("ROM fs in RAM, size %lu bytes\n", romfs_length);
memory_start = romfs_start + romfs_length;
}
/* process 1's initial memory region is the kernel code/data */
init_mm.start_code = (unsigned long) &text_start;
init_mm.end_code = (unsigned long) &_etext;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
/* min_low_pfn points to the start of DRAM, start_pfn points
* to the first DRAM pages after the kernel, and max_low_pfn
* to the end of DRAM.
*/
/*
* partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(memory_start); /* usually c0000000 + kernel + romfs */
max_pfn = PFN_DOWN((unsigned long)high_memory); /* usually c0000000 + dram size */
/*
* Initialize the boot-time allocator (start, end)
*
* We give it access to all our DRAM, but we could as well just have
* given it a small slice. No point in doing that though, unless we
* have non-contiguous memory and want the boot-stuff to be in, say,
* the smallest area.
*
* It will put a bitmap of the allocated pages in the beginning
* of the range we give it, but it won't mark the bitmaps pages
* as reserved. We have to do that ourselves below.
*
* We need to use init_bootmem_node instead of init_bootmem
* because our map starts at a quite high address (min_low_pfn).
*/
max_low_pfn = max_pfn;
min_low_pfn = PAGE_OFFSET >> PAGE_SHIFT;
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
min_low_pfn,
max_low_pfn);
/* And free all memory not belonging to the kernel (addr, size) */
free_bootmem(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn - start_pfn));
/*
* 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.
*
* Arguments are start, size
*/
reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
/* paging_init() sets up the MMU and marks all pages as reserved */
paging_init();
*cmdline_p = cris_command_line;
#ifdef CONFIG_ETRAX_CMDLINE
if (!strcmp(cris_command_line, "")) {
strlcpy(cris_command_line, CONFIG_ETRAX_CMDLINE, COMMAND_LINE_SIZE);
cris_command_line[COMMAND_LINE_SIZE - 1] = '\0';
}
#endif
/* Save command line for future references. */
memcpy(boot_command_line, cris_command_line, COMMAND_LINE_SIZE);
boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
/* give credit for the CRIS port */
show_etrax_copyright();
/* Setup utsname */
strcpy(init_utsname()->machine, cris_machine_name);
}
void __init setup_memory(void)
{
int i;
unsigned long map_size;
u32 kernel_align_start, kernel_align_size;
/* Find main memory where is the kernel */
for (i = 0; i < lmb.memory.cnt; i++) {
memory_start = (u32) lmb.memory.region[i].base;
memory_end = (u32) lmb.memory.region[i].base
+ (u32) lmb.memory.region[i].size;
if ((memory_start <= (u32)_text) &&
((u32)_text <= memory_end)) {
memory_size = memory_end - memory_start;
PAGE_OFFSET = memory_start;
printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
"size 0x%08x\n", __func__, memory_start,
memory_end, memory_size);
break;
}
}
if (!memory_start || !memory_end) {
panic("%s: Missing memory setting 0x%08x-0x%08x\n",
__func__, memory_start, memory_end);
}
/* reservation of region where is the kernel */
kernel_align_start = PAGE_DOWN((u32)_text);
/* ALIGN can be remove because _end in vmlinux.lds.S is align */
kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
lmb_reserve(kernel_align_start, kernel_align_size);
printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
__func__, kernel_align_start, kernel_align_start
+ kernel_align_size, kernel_align_size);
/*
* Kernel:
* start: base phys address of kernel - page align
* end: base phys address of kernel - page align
*
* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
* max_low_pfn
* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
* num_physpages - number of all pages
*/
/* memory start is from the kernel end (aligned) to higher addr */
min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
/* RAM is assumed contiguous */
num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
/*
* Find an area to use for the bootmem bitmap.
* We look for the first area which is at least
* 128kB in length (128kB is enough for a bitmap
* for 4GB of memory, using 4kB pages), plus 1 page
* (in case the address isn't page-aligned).
*/
map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
min_low_pfn, max_low_pfn);
lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
/* free bootmem is whole main memory */
free_bootmem(memory_start, memory_size);
/* reserve allocate blocks */
for (i = 0; i < lmb.reserved.cnt; i++) {
pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
(u32) lmb.reserved.region[i].base,
(u32) lmb_size_bytes(&lmb.reserved, i));
reserve_bootmem(lmb.reserved.region[i].base,
lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
}
paging_init();
}
void __init setup_bootmem_allocator(unsigned long free_pfn)
{
unsigned long bootmap_size;
/*
* Find a proper area for the bootmem bitmap. After this
* bootstrap step all allocations (until the page allocator
* is intact) must be done via bootmem_alloc().
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
min_low_pfn, max_low_pfn);
add_active_range(0, min_low_pfn, max_low_pfn);
register_bootmem_low_pages();
node_set_online(0);
/*
* Reserve the kernel text and
* Reserve the bootmem bitmap. We do this in two steps (first step
* was init_bootmem()), because this catches the (definitely buggy)
* case of us accidentally initializing the bootmem allocator with
* an invalid RAM area.
*/
reserve_bootmem(__MEMORY_START+PAGE_SIZE,
(PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem(__MEMORY_START, PAGE_SIZE);
sparse_memory_present_with_active_regions(0);
#ifdef CONFIG_BLK_DEV_INITRD
ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
if (&__rd_start != &__rd_end) {
LOADER_TYPE = 1;
INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
__MEMORY_START;
INITRD_SIZE = (unsigned long)&__rd_end -
(unsigned long)&__rd_start;
}
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
reserve_bootmem(INITRD_START + __MEMORY_START,
INITRD_SIZE);
initrd_start = INITRD_START + PAGE_OFFSET +
__MEMORY_START;
initrd_end = initrd_start + INITRD_SIZE;
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
max_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
}
#endif
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
reserve_bootmem(crashk_res.start,
crashk_res.end - crashk_res.start + 1);
#endif
}
static void __init bootmem_init(void)
{
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
/*
* Sanity check any INITRD first. We don't take it into account
* for bootmem setup initially, rely on the end-of-kernel-code
* as our memory range starting point. Once bootmem is inited we
* will reserve the area used for the initrd.
*/
init_initrd();
reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
/*
* max_low_pfn is not a number of pages. The number of pages
* of the system is given by 'max_low_pfn - min_low_pfn'.
*/
min_low_pfn = ~0UL;
max_low_pfn = 0;
/*
* Find the highest page frame number we have available.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (end > max_low_pfn)
max_low_pfn = end;
if (start < min_low_pfn)
min_low_pfn = start;
if (end <= reserved_end)
continue;
if (start >= mapstart)
continue;
mapstart = max(reserved_end, start);
}
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
printk(KERN_INFO
"Wasting %lu bytes for tracking %lu unused pages\n",
(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
min_low_pfn - ARCH_PFN_OFFSET);
} else if (min_low_pfn < ARCH_PFN_OFFSET) {
printk(KERN_INFO
"%lu free pages won't be used\n",
ARCH_PFN_OFFSET - min_low_pfn);
}
min_low_pfn = ARCH_PFN_OFFSET;
/*
* Determine low and high memory ranges
*/
max_pfn = max_low_pfn;
if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
highstart_pfn = PFN_DOWN(HIGHMEM_START);
highend_pfn = max_low_pfn;
#endif
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
/*
* Initialize the boot-time allocator with low memory only.
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end, size;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
/*
* Reserve usable memory.
*/
switch (boot_mem_map.map[i].type) {
case BOOT_MEM_RAM:
break;
case BOOT_MEM_INIT_RAM:
memory_present(0, start, end);
continue;
default:
/* Not usable memory */
continue;
}
/*
* We are rounding up the start address of usable memory
* and at the end of the usable range downwards.
*/
if (start >= max_low_pfn)
continue;
if (start < reserved_end)
start = reserved_end;
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
size = end - start;
/* Register lowmem ranges */
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
memory_present(0, start, end);
}
/*
* Reserve the bootmap memory.
*/
reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
/*
* Reserve initrd memory if needed.
*/
finalize_initrd();
}
void __init setup_arch(char **cmdline_p)
{
unsigned long bootmap_size;
unsigned long start_pfn, max_pfn, max_low_pfn;
#ifdef CONFIG_EARLY_PRINTK
extern void enable_early_printk(void);
enable_early_printk();
#endif
#ifdef CONFIG_CMDLINE_BOOL
strcpy(COMMAND_LINE, CONFIG_CMDLINE);
#endif
ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
if (!MOUNT_ROOT_RDONLY)
root_mountflags &= ~MS_RDONLY;
init_mm.start_code = (unsigned long) _text;
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = (unsigned long) _end;
code_resource.start = virt_to_bus(_text);
code_resource.end = virt_to_bus(_etext)-1;
data_resource.start = virt_to_bus(_etext);
data_resource.end = virt_to_bus(_edata)-1;
sh_mv_setup(cmdline_p);
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
#ifdef CONFIG_DISCONTIGMEM
NODE_DATA(0)->bdata = &discontig_node_bdata[0];
NODE_DATA(1)->bdata = &discontig_node_bdata[1];
bootmap_size = init_bootmem_node(NODE_DATA(1),
PFN_UP(__MEMORY_START_2ND),
PFN_UP(__MEMORY_START_2ND),
PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND));
free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND);
reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size);
#endif
/*
* Find the highest page frame number we have available
*/
max_pfn = PFN_DOWN(__pa(memory_end));
/*
* Determine low and high memory ranges:
*/
max_low_pfn = max_pfn;
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(_end));
/*
* Find a proper area for the bootmem bitmap. After this
* bootstrap step all allocations (until the page allocator
* is intact) must be done via bootmem_alloc().
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
__MEMORY_START>>PAGE_SHIFT,
max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
{
unsigned long curr_pfn, last_pfn, pages;
/*
* We are rounding up the start address of usable memory:
*/
curr_pfn = PFN_UP(__MEMORY_START);
/*
* ... and at the end of the usable range downwards:
*/
last_pfn = PFN_DOWN(__pa(memory_end));
if (last_pfn > max_low_pfn)
last_pfn = max_low_pfn;
pages = last_pfn - curr_pfn;
free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
PFN_PHYS(pages));
}
/*
* Reserve the kernel text and
* Reserve the bootmem bitmap. We do this in two steps (first step
* was init_bootmem()), because this catches the (definitely buggy)
* case of us accidentally initializing the bootmem allocator with
* an invalid RAM area.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
#ifdef CONFIG_BLK_DEV_INITRD
ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
if (&__rd_start != &__rd_end) {
LOADER_TYPE = 1;
INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
}
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
initrd_start =
INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
initrd_end = initrd_start + INITRD_SIZE;
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
max_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
}
#endif
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#endif
/* Perform the machine specific initialisation */
platform_setup();
paging_init();
}
static void __init bootmem_init(void)
{
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
/*
* Init any data related to initrd. It's a nop if INITRD is
* not selected. Once that done we can determine the low bound
* of usable memory.
*/
#ifdef CONFIG_XEN
reserved_end = max(init_initrd(),
(unsigned long) PFN_UP(__pa_symbol(&_end) + PAGE_SIZE));
#else
reserved_end = max(init_initrd(),
(unsigned long) PFN_UP(__pa_symbol(&_end)));
#endif
/*
* max_low_pfn is not a number of pages. The number of pages
* of the system is given by 'max_low_pfn - min_low_pfn'.
*/
min_low_pfn = ~0UL;
max_low_pfn = 0;
/*
* Find the highest page frame number we have available.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
/* Changing the math in several places below to add -1. If a region
* ends exactly on a boundary where there is no DRAM, the last PFN
* will be incorrect (one page of memory will have no DRAM backing).
* By subtracting one here, this problem is eliminated. */
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size - 1);
if (end > max_low_pfn)
max_low_pfn = end;
if (start < min_low_pfn)
min_low_pfn = start;
if (end <= reserved_end)
continue;
if (start >= mapstart)
continue;
mapstart = max(reserved_end, start);
}
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
min_low_pfn - ARCH_PFN_OFFSET);
} else if (min_low_pfn < ARCH_PFN_OFFSET) {
pr_info("%lu free pages won't be used\n",
ARCH_PFN_OFFSET - min_low_pfn);
}
min_low_pfn = ARCH_PFN_OFFSET;
/*
* Determine low and high memory ranges
*/
max_pfn = max_low_pfn;
if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
highstart_pfn = PFN_DOWN(HIGHMEM_START);
highend_pfn = max_low_pfn;
#endif
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
max_low_pfn = recalculate_max_low_pfn(max_low_pfn);
#ifdef DEBUG_MAPPED_KERNEL
printk("max_low_pfn = 0x%lx\n", max_low_pfn);
#endif
/*
* Initialize the boot-time allocator with low memory only.
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size - 1);
if (start <= min_low_pfn)
start = min_low_pfn;
if (start >= end)
continue;
#ifndef CONFIG_HIGHMEM
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
#endif
add_active_range(0, start, end);
}
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end, size;
/*
* Reserve usable memory.
*/
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
continue;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size - 1);
/*
* We are rounding up the start address of usable memory
* and at the end of the usable range downwards.
*/
if (start >= max_low_pfn)
continue;
if (start < reserved_end)
start = reserved_end;
if (end > max_low_pfn)
end = max_low_pfn;
/*
* ... finally, is the area going away?
*/
if (end <= start)
continue;
size = end - start;
/* Register lowmem ranges */
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
memory_present(0, start, end);
}
/*
* Reserve the bootmap memory.
*/
reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
/*
* Reserve initrd memory if needed.
*/
finalize_initrd();
}