#include <linux/mm.h>
#include <linux/pfn.h>
#include <linux/suspend.h>
+#include <linux/firmware-map.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <asm/trampoline.h>
+/*
+ * The e820 map is the map that gets modified e.g. with command line parameters
+ * and that is also registered with modifications in the kernel resource tree
+ * with the iomem_resource as parent.
+ *
+ * The e820_saved is directly saved after the BIOS-provided memory map is
+ * copied. It doesn't get modified afterwards. It's registered for the
+ * /sys/firmware/memmap interface.
+ *
+ * That memory map is not modified and is used as base for kexec. The kexec'd
+ * kernel should get the same memory map as the firmware provides. Then the
+ * user can e.g. boot the original kernel with mem=1G while still booting the
+ * next kernel with full memory.
+ */
struct e820map e820;
+struct e820map e820_saved;
/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0xaeedbabe;
return __append_e820_map(biosmap, nr_map);
}
-u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
- unsigned new_type)
+static u64 __init e820_update_range_map(struct e820map *e820x, u64 start,
+ u64 size, unsigned old_type,
+ unsigned new_type)
{
int i;
u64 real_updated_size = 0;
size = ULLONG_MAX - start;
for (i = 0; i < e820.nr_map; i++) {
- struct e820entry *ei = &e820.map[i];
+ struct e820entry *ei = &e820x->map[i];
u64 final_start, final_end;
if (ei->type != old_type)
continue;
return real_updated_size;
}
+u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
+ unsigned new_type)
+{
+ return e820_update_range_map(&e820, start, size, old_type, new_type);
+}
+
+static u64 __init e820_update_range_saved(u64 start, u64 size,
+ unsigned old_type, unsigned new_type)
+{
+ return e820_update_range_map(&e820_saved, start, size, old_type,
+ new_type);
+}
+
/* make e820 not cover the range */
u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
int checktype)
printk(KERN_INFO "modified physical RAM map:\n");
e820_print_map("modified");
}
+static void __init update_e820_saved(void)
+{
+ int nr_map;
+
+ nr_map = e820_saved.nr_map;
+ if (sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), &nr_map))
+ return;
+ e820_saved.nr_map = nr_map;
+}
#define MAX_GAP_END 0x100000000ull
/*
* Search for a gap in the e820 memory space from start_addr to end_addr.
addr = round_down(start + size - sizet, align);
e820_update_range(addr, sizet, E820_RAM, E820_RESERVED);
+ e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED);
printk(KERN_INFO "update e820 for early_reserve_e820\n");
update_e820();
+ update_e820_saved();
return addr;
}
# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
#endif
-/*
- * Last pfn which the user wants to use.
- */
-unsigned long __initdata end_user_pfn = MAX_ARCH_PFN;
-
/*
* Find the highest page frame number we have available
*/
-unsigned long __init e820_end_of_ram(void)
+static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
{
- unsigned long last_pfn;
+ int i;
+ unsigned long last_pfn = 0;
unsigned long max_arch_pfn = MAX_ARCH_PFN;
- last_pfn = find_max_pfn_with_active_regions();
+ for (i = 0; i < e820.nr_map; i++) {
+ struct e820entry *ei = &e820.map[i];
+ unsigned long start_pfn;
+ unsigned long end_pfn;
+
+ if (ei->type != type)
+ continue;
+
+ start_pfn = ei->addr >> PAGE_SHIFT;
+ end_pfn = (ei->addr + ei->size) >> PAGE_SHIFT;
+
+ if (start_pfn >= limit_pfn)
+ continue;
+ if (end_pfn > limit_pfn) {
+ last_pfn = limit_pfn;
+ break;
+ }
+ if (end_pfn > last_pfn)
+ last_pfn = end_pfn;
+ }
if (last_pfn > max_arch_pfn)
last_pfn = max_arch_pfn;
- if (last_pfn > end_user_pfn)
- last_pfn = end_user_pfn;
printk(KERN_INFO "last_pfn = %#lx max_arch_pfn = %#lx\n",
last_pfn, max_arch_pfn);
return last_pfn;
}
+unsigned long __init e820_end_of_ram_pfn(void)
+{
+ return e820_end_pfn(MAX_ARCH_PFN, E820_RAM);
+}
+unsigned long __init e820_end_of_low_ram_pfn(void)
+{
+ return e820_end_pfn(1UL<<(32 - PAGE_SHIFT), E820_RAM);
+}
/*
* Finds an active region in the address range from start_pfn to last_pfn and
* returns its range in ei_startpfn and ei_endpfn for the e820 entry.
if (*ei_endpfn > last_pfn)
*ei_endpfn = last_pfn;
- /* Obey end_user_pfn to save on memmap */
- if (*ei_startpfn >= end_user_pfn)
- return 0;
- if (*ei_endpfn > end_user_pfn)
- *ei_endpfn = end_user_pfn;
-
return 1;
}
panic(msg);
}
+static int userdef __initdata;
+
/* "mem=nopentium" disables the 4MB page tables. */
static int __init parse_memopt(char *p)
{
}
#endif
+ userdef = 1;
mem_size = memparse(p, &p);
- end_user_pfn = mem_size>>PAGE_SHIFT;
- e820_update_range(mem_size, ULLONG_MAX - mem_size,
- E820_RAM, E820_RESERVED);
+ e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
return 0;
}
early_param("mem", parse_memopt);
-static int userdef __initdata;
-
static int __init parse_memmap_opt(char *p)
{
char *oldp;
u64 start_at, mem_size;
+ if (!p)
+ return -EINVAL;
+
if (!strcmp(p, "exactmap")) {
#ifdef CONFIG_CRASH_DUMP
/*
* the real mem size before original memory map is
* reset.
*/
- e820_register_active_regions(0, 0, -1UL);
- saved_max_pfn = e820_end_of_ram();
- remove_all_active_ranges();
+ saved_max_pfn = e820_end_of_ram_pfn();
#endif
e820.nr_map = 0;
userdef = 1;
} else if (*p == '$') {
start_at = memparse(p+1, &p);
e820_add_region(start_at, mem_size, E820_RESERVED);
- } else {
- end_user_pfn = (mem_size >> PAGE_SHIFT);
- e820_update_range(mem_size, ULLONG_MAX - mem_size,
- E820_RAM, E820_RESERVED);
- }
+ } else
+ e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
+
return *p == '\0' ? 0 : -EINVAL;
}
early_param("memmap", parse_memmap_opt);
}
}
+static inline const char *e820_type_to_string(int e820_type)
+{
+ switch (e820_type) {
+ case E820_RESERVED_KERN:
+ case E820_RAM: return "System RAM";
+ case E820_ACPI: return "ACPI Tables";
+ case E820_NVS: return "ACPI Non-volatile Storage";
+ default: return "reserved";
+ }
+}
+
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
for (i = 0; i < e820.nr_map; i++) {
- switch (e820.map[i].type) {
- case E820_RESERVED_KERN:
- case E820_RAM: res->name = "System RAM"; break;
- case E820_ACPI: res->name = "ACPI Tables"; break;
- case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
- default: res->name = "reserved";
- }
end = e820.map[i].addr + e820.map[i].size - 1;
#ifndef CONFIG_RESOURCES_64BIT
if (end > 0x100000000ULL) {
continue;
}
#endif
+ res->name = e820_type_to_string(e820.map[i].type);
res->start = e820.map[i].addr;
res->end = end;
insert_resource(&iomem_resource, res);
res++;
}
+
+ for (i = 0; i < e820_saved.nr_map; i++) {
+ struct e820entry *entry = &e820_saved.map[i];
+ firmware_map_add_early(entry->addr,
+ entry->addr + entry->size - 1,
+ e820_type_to_string(entry->type));
+ }
}
+/*
+ * Non-standard memory setup can be specified via this quirk:
+ */
+char * (*arch_memory_setup_quirk)(void);
+
char *__init default_machine_specific_memory_setup(void)
{
char *who = "BIOS-e820";
char *__init __attribute__((weak)) machine_specific_memory_setup(void)
{
+ if (arch_memory_setup_quirk) {
+ char *who = arch_memory_setup_quirk();
+
+ if (who)
+ return who;
+ }
return default_machine_specific_memory_setup();
}
void __init setup_memory_map(void)
{
+ char *who;
+
+ who = memory_setup();
+ memcpy(&e820_saved, &e820, sizeof(struct e820map));
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
- e820_print_map(memory_setup());
+ e820_print_map(who);
}
#ifdef CONFIG_X86_64
projects / linux-2.6 / blobdiff