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x86: Separate early_res related code from e820.c

Browse Source 
... to make e820.c smaller.

-v2: fix 32bit compiling with MAX_DMA32_PFN

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-21-git-send-email-yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Yinghai Lu 2010-02-10 01:20:24 -08:00 committed by H. Peter Anvin
parent db8f77c889
commit a678c2be75
5 changed files with 561 additions and 553 deletions
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13
arch/x86/include/asm/e820.h
View File

@ -109,19 +109,8 @@ static inline void early_memtest(unsigned long start, unsigned long end)
extern unsigned long end_user_pfn;
extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
extern void reserve_early(u64 start, u64 end, char *name);
extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
void reserve_early_without_check(u64 start, u64 end, char *name);
u64 find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
u64 size, u64 align);
#include <linux/range.h>
int get_free_all_memory_range(struct range **rangep, int nodeid);
#include <asm/early_res.h>
extern unsigned long e820_end_of_ram_pfn(void);
extern unsigned long e820_end_of_low_ram_pfn(void);

20
arch/x86/include/asm/early_res.h Normal file
View File

@ -0,0 +1,20 @@
#ifndef _ASM_X86_EARLY_RES_H
#define _ASM_X86_EARLY_RES_H
#ifdef __KERNEL__
extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
extern void reserve_early(u64 start, u64 end, char *name);
extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
void reserve_early_without_check(u64 start, u64 end, char *name);
u64 find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
u64 size, u64 align);
#include <linux/range.h>
int get_free_all_memory_range(struct range **rangep, int nodeid);
#endif /* __KERNEL__ */
#endif /* _ASM_X86_EARLY_RES_H */

2
arch/x86/kernel/Makefile
View File

@ -38,7 +38,7 @@ obj-$(CONFIG_X86_32) += probe_roms_32.o
obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
obj-$(CONFIG_X86_64) += syscall_64.o vsyscall_64.o
obj-y += bootflag.o e820.o
obj-y += bootflag.o e820.o early_res.o
obj-y += pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o pci-nommu.o hw_breakpoint.o
obj-y += tsc.o io_delay.o rtc.o

541
arch/x86/kernel/e820.c
View File

@ -12,21 +12,14 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/kexec.h>
#include <linux/module.h>
#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/e820.h>
#include <asm/early_res.h>
#include <asm/proto.h>
#include <asm/setup.h>
#include <asm/trampoline.h>
/*
* The e820 map is the map that gets modified e.g. with command line parameters
@ -729,538 +722,6 @@ static int __init e820_mark_nvs_memory(void)
core_initcall(e820_mark_nvs_memory);
#endif
/*
* Early reserved memory areas.
*/
/*
* need to make sure this one is bigger enough before
* find_e820_area could be used
*/
#define MAX_EARLY_RES_X 32
struct early_res {
u64 start, end;
char name[15];
char overlap_ok;
};
static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
static int max_early_res __initdata = MAX_EARLY_RES_X;
static struct early_res *early_res __initdata = &early_res_x[0];
static int early_res_count __initdata;
static int __init find_overlapped_early(u64 start, u64 end)
{
int i;
struct early_res *r;
for (i = 0; i < max_early_res && early_res[i].end; i++) {
r = &early_res[i];
if (end > r->start && start < r->end)
break;
}
return i;
}
/*
* Drop the i-th range from the early reservation map,
* by copying any higher ranges down one over it, and
* clearing what had been the last slot.
*/
static void __init drop_range(int i)
{
int j;
for (j = i + 1; j < max_early_res && early_res[j].end; j++)
;
memmove(&early_res[i], &early_res[i + 1],
(j - 1 - i) * sizeof(struct early_res));
early_res[j - 1].end = 0;
early_res_count--;
}
/*
* Split any existing ranges that:
* 1) are marked 'overlap_ok', and
* 2) overlap with the stated range [start, end)
* into whatever portion (if any) of the existing range is entirely
* below or entirely above the stated range. Drop the portion
* of the existing range that overlaps with the stated range,
* which will allow the caller of this routine to then add that
* stated range without conflicting with any existing range.
*/
static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
{
int i;
struct early_res *r;
u64 lower_start, lower_end;
u64 upper_start, upper_end;
char name[15];
for (i = 0; i < max_early_res && early_res[i].end; i++) {
r = &early_res[i];
/* Continue past non-overlapping ranges */
if (end <= r->start || start >= r->end)
continue;
/*
* Leave non-ok overlaps as is; let caller
* panic "Overlapping early reservations"
* when it hits this overlap.
*/
if (!r->overlap_ok)
return;
/*
* We have an ok overlap. We will drop it from the early
* reservation map, and add back in any non-overlapping
* portions (lower or upper) as separate, overlap_ok,
* non-overlapping ranges.
*/
/* 1. Note any non-overlapping (lower or upper) ranges. */
strncpy(name, r->name, sizeof(name) - 1);
lower_start = lower_end = 0;
upper_start = upper_end = 0;
if (r->start < start) {
lower_start = r->start;
lower_end = start;
}
if (r->end > end) {
upper_start = end;
upper_end = r->end;
}
/* 2. Drop the original ok overlapping range */
drop_range(i);
i--; /* resume for-loop on copied down entry */
/* 3. Add back in any non-overlapping ranges. */
if (lower_end)
reserve_early_overlap_ok(lower_start, lower_end, name);
if (upper_end)
reserve_early_overlap_ok(upper_start, upper_end, name);
}
}
static void __init __reserve_early(u64 start, u64 end, char *name,
int overlap_ok)
{
int i;
struct early_res *r;
i = find_overlapped_early(start, end);
if (i >= max_early_res)
panic("Too many early reservations");
r = &early_res[i];
if (r->end)
panic("Overlapping early reservations "
"%llx-%llx %s to %llx-%llx %s\n",
start, end - 1, name?name:"", r->start,
r->end - 1, r->name);
r->start = start;
r->end = end;
r->overlap_ok = overlap_ok;
if (name)
strncpy(r->name, name, sizeof(r->name) - 1);
early_res_count++;
}
/*
* A few early reservtations come here.
*
* The 'overlap_ok' in the name of this routine does -not- mean it
* is ok for these reservations to overlap an earlier reservation.
* Rather it means that it is ok for subsequent reservations to
* overlap this one.
*
* Use this entry point to reserve early ranges when you are doing
* so out of "Paranoia", reserving perhaps more memory than you need,
* just in case, and don't mind a subsequent overlapping reservation
* that is known to be needed.
*
* The drop_overlaps_that_are_ok() call here isn't really needed.
* It would be needed if we had two colliding 'overlap_ok'
* reservations, so that the second such would not panic on the
* overlap with the first. We don't have any such as of this
* writing, but might as well tolerate such if it happens in
* the future.
*/
void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
{
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 1);
}
static void __init __check_and_double_early_res(u64 start)
{
u64 end, size, mem;
struct early_res *new;
/* do we have enough slots left ? */
if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
return;
/* double it */
end = max_pfn_mapped << PAGE_SHIFT;
size = sizeof(struct early_res) * max_early_res * 2;
mem = find_e820_area(start, end, size, sizeof(struct early_res));
if (mem == -1ULL)
panic("can not find more space for early_res array");
new = __va(mem);
/* save the first one for own */
new[0].start = mem;
new[0].end = mem + size;
new[0].overlap_ok = 0;
/* copy old to new */
if (early_res == early_res_x) {
memcpy(&new[1], &early_res[0],
sizeof(struct early_res) * max_early_res);
memset(&new[max_early_res+1], 0,
sizeof(struct early_res) * (max_early_res - 1));
early_res_count++;
} else {
memcpy(&new[1], &early_res[1],
sizeof(struct early_res) * (max_early_res - 1));
memset(&new[max_early_res], 0,
sizeof(struct early_res) * max_early_res);
}
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
early_res = new;
max_early_res *= 2;
printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
max_early_res, mem, mem + size - 1);
}
/*
* Most early reservations come here.
*
* We first have drop_overlaps_that_are_ok() drop any pre-existing
* 'overlap_ok' ranges, so that we can then reserve this memory
* range without risk of panic'ing on an overlapping overlap_ok
* early reservation.
*/
void __init reserve_early(u64 start, u64 end, char *name)
{
if (start >= end)
return;
__check_and_double_early_res(end);
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 0);
}
void __init reserve_early_without_check(u64 start, u64 end, char *name)
{
struct early_res *r;
if (start >= end)
return;
__check_and_double_early_res(end);
r = &early_res[early_res_count];
r->start = start;
r->end = end;
r->overlap_ok = 0;
if (name)
strncpy(r->name, name, sizeof(r->name) - 1);
early_res_count++;
}
void __init free_early(u64 start, u64 end)
{
struct early_res *r;
int i;
i = find_overlapped_early(start, end);
r = &early_res[i];
if (i >= max_early_res || r->end != end || r->start != start)
panic("free_early on not reserved area: %llx-%llx!",
start, end - 1);
drop_range(i);
}
#ifdef CONFIG_NO_BOOTMEM
static void __init subtract_early_res(struct range *range, int az)
{
int i, count;
u64 final_start, final_end;
int idx = 0;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
/* need to skip first one ?*/
if (early_res != early_res_x)
idx = 1;
#if 1
printk(KERN_INFO "Subtract (%d early reservations)\n", count);
#endif
for (i = idx; i < count; i++) {
struct early_res *r = &early_res[i];
#if 0
printk(KERN_INFO " #%d [%010llx - %010llx] %15s", i,
r->start, r->end, r->name);
#endif
final_start = PFN_DOWN(r->start);
final_end = PFN_UP(r->end);
if (final_start >= final_end) {
#if 0
printk(KERN_CONT "\n");
#endif
continue;
}
#if 0
printk(KERN_CONT " subtract pfn [%010llx - %010llx]\n",
final_start, final_end);
#endif
subtract_range(range, az, final_start, final_end);
}
}
int __init get_free_all_memory_range(struct range **rangep, int nodeid)
{
int i, count;
u64 start = 0, end;
u64 size;
u64 mem;
struct range *range;
int nr_range;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
count *= 2;
size = sizeof(struct range) * count;
#ifdef MAX_DMA32_PFN
if (max_pfn_mapped > MAX_DMA32_PFN)
start = MAX_DMA32_PFN << PAGE_SHIFT;
#endif
end = max_pfn_mapped << PAGE_SHIFT;
mem = find_e820_area(start, end, size, sizeof(struct range));
if (mem == -1ULL)
panic("can not find more space for range free");
range = __va(mem);
/* use early_node_map[] and early_res to get range array at first */
memset(range, 0, size);
nr_range = 0;
/* need to go over early_node_map to find out good range for node */
nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
subtract_early_res(range, count);
nr_range = clean_sort_range(range, count);
/* need to clear it ? */
if (nodeid == MAX_NUMNODES) {
memset(&early_res[0], 0,
sizeof(struct early_res) * max_early_res);
early_res = NULL;
max_early_res = 0;
}
*rangep = range;
return nr_range;
}
#else
void __init early_res_to_bootmem(u64 start, u64 end)
{
int i, count;
u64 final_start, final_end;
int idx = 0;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
/* need to skip first one ?*/
if (early_res != early_res_x)
idx = 1;
printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
count - idx, max_early_res, start, end);
for (i = idx; i < count; i++) {
struct early_res *r = &early_res[i];
printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
r->start, r->end, r->name);
final_start = max(start, r->start);
final_end = min(end, r->end);
if (final_start >= final_end) {
printk(KERN_CONT "\n");
continue;
}
printk(KERN_CONT " ==> [%010llx - %010llx]\n",
final_start, final_end);
reserve_bootmem_generic(final_start, final_end - final_start,
BOOTMEM_DEFAULT);
}
/* clear them */
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
early_res = NULL;
max_early_res = 0;
early_res_count = 0;
}
#endif
/* Check for already reserved areas */
static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
{
int i;
u64 addr = *addrp;
int changed = 0;
struct early_res *r;
again:
i = find_overlapped_early(addr, addr + size);
r = &early_res[i];
if (i < max_early_res && r->end) {
*addrp = addr = round_up(r->end, align);
changed = 1;
goto again;
}
return changed;
}
/* Check for already reserved areas */
static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
{
int i;
u64 addr = *addrp, last;
u64 size = *sizep;
int changed = 0;
again:
last = addr + size;
for (i = 0; i < max_early_res && early_res[i].end; i++) {
struct early_res *r = &early_res[i];
if (last > r->start && addr < r->start) {
size = r->start - addr;
changed = 1;
goto again;
}
if (last > r->end && addr < r->end) {
addr = round_up(r->end, align);
size = last - addr;
changed = 1;
goto again;
}
if (last <= r->end && addr >= r->start) {
(*sizep)++;
return 0;
}
}
if (changed) {
*addrp = addr;
*sizep = size;
}
return changed;
}
/*
* Find a free area with specified alignment in a specific range.
* only with the area.between start to end is active range from early_node_map
* so they are good as RAM
*/
u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
u64 size, u64 align)
{
u64 addr, last;
addr = round_up(ei_start, align);
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
goto out;
while (bad_addr(&addr, size, align) && addr+size <= ei_last)
;
last = addr + size;
if (last > ei_last)
goto out;
if (last > end)
goto out;
return addr;
out:
return -1ULL;
}
/*
* Find a free area with specified alignment in a specific range.
*/
u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 addr;
u64 ei_start, ei_last;
if (ei->type != E820_RAM)
continue;
ei_last = ei->addr + ei->size;
ei_start = ei->addr;
addr = find_early_area(ei_start, ei_last, start, end,
size, align);
if (addr == -1ULL)
continue;
return addr;
}
return -1ULL;
}
/*
* Find next free range after *start
*/
u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 addr, last;
u64 ei_last;
if (ei->type != E820_RAM)
continue;
addr = round_up(ei->addr, align);
ei_last = ei->addr + ei->size;
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
continue;
*sizep = ei_last - addr;
while (bad_addr_size(&addr, sizep, align) &&
addr + *sizep <= ei_last)
;
last = addr + *sizep;
if (last > ei_last)
continue;
return addr;
}
return -1ULL;
}
/*
* pre allocated 4k and reserved it in e820
*/

538
arch/x86/kernel/early_res.c Normal file
View File

@ -0,0 +1,538 @@
/*
* early_res, could be used to replace bootmem
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <asm/e820.h>
#include <asm/early_res.h>
#include <asm/proto.h>
/*
* Early reserved memory areas.
*/
/*
* need to make sure this one is bigger enough before
* find_e820_area could be used
*/
#define MAX_EARLY_RES_X 32
struct early_res {
u64 start, end;
char name[15];
char overlap_ok;
};
static struct early_res early_res_x[MAX_EARLY_RES_X] __initdata;
static int max_early_res __initdata = MAX_EARLY_RES_X;
static struct early_res *early_res __initdata = &early_res_x[0];
static int early_res_count __initdata;
static int __init find_overlapped_early(u64 start, u64 end)
{
int i;
struct early_res *r;
for (i = 0; i < max_early_res && early_res[i].end; i++) {
r = &early_res[i];
if (end > r->start && start < r->end)
break;
}
return i;
}
/*
* Drop the i-th range from the early reservation map,
* by copying any higher ranges down one over it, and
* clearing what had been the last slot.
*/
static void __init drop_range(int i)
{
int j;
for (j = i + 1; j < max_early_res && early_res[j].end; j++)
;
memmove(&early_res[i], &early_res[i + 1],
(j - 1 - i) * sizeof(struct early_res));
early_res[j - 1].end = 0;
early_res_count--;
}
/*
* Split any existing ranges that:
* 1) are marked 'overlap_ok', and
* 2) overlap with the stated range [start, end)
* into whatever portion (if any) of the existing range is entirely
* below or entirely above the stated range. Drop the portion
* of the existing range that overlaps with the stated range,
* which will allow the caller of this routine to then add that
* stated range without conflicting with any existing range.
*/
static void __init drop_overlaps_that_are_ok(u64 start, u64 end)
{
int i;
struct early_res *r;
u64 lower_start, lower_end;
u64 upper_start, upper_end;
char name[15];
for (i = 0; i < max_early_res && early_res[i].end; i++) {
r = &early_res[i];
/* Continue past non-overlapping ranges */
if (end <= r->start || start >= r->end)
continue;
/*
* Leave non-ok overlaps as is; let caller
* panic "Overlapping early reservations"
* when it hits this overlap.
*/
if (!r->overlap_ok)
return;
/*
* We have an ok overlap. We will drop it from the early
* reservation map, and add back in any non-overlapping
* portions (lower or upper) as separate, overlap_ok,
* non-overlapping ranges.
*/
/* 1. Note any non-overlapping (lower or upper) ranges. */
strncpy(name, r->name, sizeof(name) - 1);
lower_start = lower_end = 0;
upper_start = upper_end = 0;
if (r->start < start) {
lower_start = r->start;
lower_end = start;
}
if (r->end > end) {
upper_start = end;
upper_end = r->end;
}
/* 2. Drop the original ok overlapping range */
drop_range(i);
i--; /* resume for-loop on copied down entry */
/* 3. Add back in any non-overlapping ranges. */
if (lower_end)
reserve_early_overlap_ok(lower_start, lower_end, name);
if (upper_end)
reserve_early_overlap_ok(upper_start, upper_end, name);
}
}
static void __init __reserve_early(u64 start, u64 end, char *name,
int overlap_ok)
{
int i;
struct early_res *r;
i = find_overlapped_early(start, end);
if (i >= max_early_res)
panic("Too many early reservations");
r = &early_res[i];
if (r->end)
panic("Overlapping early reservations "
"%llx-%llx %s to %llx-%llx %s\n",
start, end - 1, name ? name : "", r->start,
r->end - 1, r->name);
r->start = start;
r->end = end;
r->overlap_ok = overlap_ok;
if (name)
strncpy(r->name, name, sizeof(r->name) - 1);
early_res_count++;
}
/*
* A few early reservtations come here.
*
* The 'overlap_ok' in the name of this routine does -not- mean it
* is ok for these reservations to overlap an earlier reservation.
* Rather it means that it is ok for subsequent reservations to
* overlap this one.
*
* Use this entry point to reserve early ranges when you are doing
* so out of "Paranoia", reserving perhaps more memory than you need,
* just in case, and don't mind a subsequent overlapping reservation
* that is known to be needed.
*
* The drop_overlaps_that_are_ok() call here isn't really needed.
* It would be needed if we had two colliding 'overlap_ok'
* reservations, so that the second such would not panic on the
* overlap with the first. We don't have any such as of this
* writing, but might as well tolerate such if it happens in
* the future.
*/
void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
{
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 1);
}
static void __init __check_and_double_early_res(u64 start)
{
u64 end, size, mem;
struct early_res *new;
/* do we have enough slots left ? */
if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
return;
/* double it */
end = max_pfn_mapped << PAGE_SHIFT;
size = sizeof(struct early_res) * max_early_res * 2;
mem = find_e820_area(start, end, size, sizeof(struct early_res));
if (mem == -1ULL)
panic("can not find more space for early_res array");
new = __va(mem);
/* save the first one for own */
new[0].start = mem;
new[0].end = mem + size;
new[0].overlap_ok = 0;
/* copy old to new */
if (early_res == early_res_x) {
memcpy(&new[1], &early_res[0],
sizeof(struct early_res) * max_early_res);
memset(&new[max_early_res+1], 0,
sizeof(struct early_res) * (max_early_res - 1));
early_res_count++;
} else {
memcpy(&new[1], &early_res[1],
sizeof(struct early_res) * (max_early_res - 1));
memset(&new[max_early_res], 0,
sizeof(struct early_res) * max_early_res);
}
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
early_res = new;
max_early_res *= 2;
printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
max_early_res, mem, mem + size - 1);
}
/*
* Most early reservations come here.
*
* We first have drop_overlaps_that_are_ok() drop any pre-existing
* 'overlap_ok' ranges, so that we can then reserve this memory
* range without risk of panic'ing on an overlapping overlap_ok
* early reservation.
*/
void __init reserve_early(u64 start, u64 end, char *name)
{
if (start >= end)
return;
__check_and_double_early_res(end);
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 0);
}
void __init reserve_early_without_check(u64 start, u64 end, char *name)
{
struct early_res *r;
if (start >= end)
return;
__check_and_double_early_res(end);
r = &early_res[early_res_count];
r->start = start;
r->end = end;
r->overlap_ok = 0;
if (name)
strncpy(r->name, name, sizeof(r->name) - 1);
early_res_count++;
}
void __init free_early(u64 start, u64 end)
{
struct early_res *r;
int i;
i = find_overlapped_early(start, end);
r = &early_res[i];
if (i >= max_early_res || r->end != end || r->start != start)
panic("free_early on not reserved area: %llx-%llx!",
start, end - 1);
drop_range(i);
}
#ifdef CONFIG_NO_BOOTMEM
static void __init subtract_early_res(struct range *range, int az)
{
int i, count;
u64 final_start, final_end;
int idx = 0;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
/* need to skip first one ?*/
if (early_res != early_res_x)
idx = 1;
#define DEBUG_PRINT_EARLY_RES 1
#if DEBUG_PRINT_EARLY_RES
printk(KERN_INFO "Subtract (%d early reservations)\n", count);
#endif
for (i = idx; i < count; i++) {
struct early_res *r = &early_res[i];
#if DEBUG_PRINT_EARLY_RES
printk(KERN_INFO " #%d [%010llx - %010llx] %15s\n", i,
r->start, r->end, r->name);
#endif
final_start = PFN_DOWN(r->start);
final_end = PFN_UP(r->end);
if (final_start >= final_end)
continue;
subtract_range(range, az, final_start, final_end);
}
}
int __init get_free_all_memory_range(struct range **rangep, int nodeid)
{
int i, count;
u64 start = 0, end;
u64 size;
u64 mem;
struct range *range;
int nr_range;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
count *= 2;
size = sizeof(struct range) * count;
#ifdef MAX_DMA32_PFN
if (max_pfn_mapped > MAX_DMA32_PFN)
start = MAX_DMA32_PFN << PAGE_SHIFT;
#endif
end = max_pfn_mapped << PAGE_SHIFT;
mem = find_e820_area(start, end, size, sizeof(struct range));
if (mem == -1ULL)
panic("can not find more space for range free");
range = __va(mem);
/* use early_node_map[] and early_res to get range array at first */
memset(range, 0, size);
nr_range = 0;
/* need to go over early_node_map to find out good range for node */
nr_range = add_from_early_node_map(range, count, nr_range, nodeid);
subtract_early_res(range, count);
nr_range = clean_sort_range(range, count);
/* need to clear it ? */
if (nodeid == MAX_NUMNODES) {
memset(&early_res[0], 0,
sizeof(struct early_res) * max_early_res);
early_res = NULL;
max_early_res = 0;
}
*rangep = range;
return nr_range;
}
#else
void __init early_res_to_bootmem(u64 start, u64 end)
{
int i, count;
u64 final_start, final_end;
int idx = 0;
count = 0;
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
/* need to skip first one ?*/
if (early_res != early_res_x)
idx = 1;
printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
count - idx, max_early_res, start, end);
for (i = idx; i < count; i++) {
struct early_res *r = &early_res[i];
printk(KERN_INFO " #%d [%010llx - %010llx] %16s", i,
r->start, r->end, r->name);
final_start = max(start, r->start);
final_end = min(end, r->end);
if (final_start >= final_end) {
printk(KERN_CONT "\n");
continue;
}
printk(KERN_CONT " ==> [%010llx - %010llx]\n",
final_start, final_end);
reserve_bootmem_generic(final_start, final_end - final_start,
BOOTMEM_DEFAULT);
}
/* clear them */
memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
early_res = NULL;
max_early_res = 0;
early_res_count = 0;
}
#endif
/* Check for already reserved areas */
static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
{
int i;
u64 addr = *addrp;
int changed = 0;
struct early_res *r;
again:
i = find_overlapped_early(addr, addr + size);
r = &early_res[i];
if (i < max_early_res && r->end) {
*addrp = addr = round_up(r->end, align);
changed = 1;
goto again;
}
return changed;
}
/* Check for already reserved areas */
static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
{
int i;
u64 addr = *addrp, last;
u64 size = *sizep;
int changed = 0;
again:
last = addr + size;
for (i = 0; i < max_early_res && early_res[i].end; i++) {
struct early_res *r = &early_res[i];
if (last > r->start && addr < r->start) {
size = r->start - addr;
changed = 1;
goto again;
}
if (last > r->end && addr < r->end) {
addr = round_up(r->end, align);
size = last - addr;
changed = 1;
goto again;
}
if (last <= r->end && addr >= r->start) {
(*sizep)++;
return 0;
}
}
if (changed) {
*addrp = addr;
*sizep = size;
}
return changed;
}
/*
* Find a free area with specified alignment in a specific range.
* only with the area.between start to end is active range from early_node_map
* so they are good as RAM
*/
u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
u64 size, u64 align)
{
u64 addr, last;
addr = round_up(ei_start, align);
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
goto out;
while (bad_addr(&addr, size, align) && addr+size <= ei_last)
;
last = addr + size;
if (last > ei_last)
goto out;
if (last > end)
goto out;
return addr;
out:
return -1ULL;
}
/*
* Find a free area with specified alignment in a specific range.
*/
u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 addr;
u64 ei_start, ei_last;
if (ei->type != E820_RAM)
continue;
ei_last = ei->addr + ei->size;
ei_start = ei->addr;
addr = find_early_area(ei_start, ei_last, start, end,
size, align);
if (addr == -1ULL)
continue;
return addr;
}
return -1ULL;
}
/*
* Find next free range after *start
*/
u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 addr, last;
u64 ei_last;
if (ei->type != E820_RAM)
continue;
addr = round_up(ei->addr, align);
ei_last = ei->addr + ei->size;
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
continue;
*sizep = ei_last - addr;
while (bad_addr_size(&addr, sizep, align) &&
addr + *sizep <= ei_last)
;
last = addr + *sizep;
if (last > ei_last)
continue;
return addr;
}
return -1ULL;
}