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x86: replace hard coded reservations in 64-bit early boot code with dynamic table

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On x86-64 there are several memory allocations before bootmem. To avoid
them stomping on each other they used to be all hard coded in bad_area().
Replace this with an array that is filled as needed.

This cleans up the code considerably and allows to expand its use.

Cc: peterz@infradead.org
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andi Kleen 2008-01-30 13:33:17 +01:00 committed by Ingo Molnar
parent edcd81199d
commit 7517527891
7 changed files with 113 additions and 115 deletions
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101
arch/x86/kernel/e820_64.c
View file

@ -47,56 +47,65 @@ unsigned long end_pfn_map;
*/
static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
/* Check for some hardcoded bad areas that early boot is not allowed to touch */
/*
* Early reserved memory areas.
*/
#define MAX_EARLY_RES 20
struct early_res {
unsigned long start, end;
};
static struct early_res early_res[MAX_EARLY_RES] __initdata = {
{ 0, PAGE_SIZE }, /* BIOS data page */
#ifdef CONFIG_SMP
{ SMP_TRAMPOLINE_BASE, SMP_TRAMPOLINE_BASE + 2*PAGE_SIZE },
#endif
{}
};
void __init reserve_early(unsigned long start, unsigned long 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)
panic("Duplicated early reservation %lx-%lx\n",
start, end);
}
if (i >= MAX_EARLY_RES)
panic("Too many early reservations");
r = &early_res[i];
r->start = start;
r->end = end;
}
void __init early_res_to_bootmem(void)
{
int i;
for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
struct early_res *r = &early_res[i];
reserve_bootmem_generic(r->start, r->end - r->start);
}
}
/* Check for already reserved areas */
static inline int bad_addr(unsigned long *addrp, unsigned long size)
{
unsigned long addr = *addrp, last = addr + size;
/* various gunk below that needed for SMP startup */
if (addr < 0x8000) {
*addrp = PAGE_ALIGN(0x8000);
return 1;
}
/* direct mapping tables of the kernel */
if (last >= table_start<<PAGE_SHIFT && addr < table_end<<PAGE_SHIFT) {
*addrp = PAGE_ALIGN(table_end << PAGE_SHIFT);
return 1;
}
/* initrd */
#ifdef CONFIG_BLK_DEV_INITRD
if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
unsigned long ramdisk_end = ramdisk_image+ramdisk_size;
if (last >= ramdisk_image && addr < ramdisk_end) {
*addrp = PAGE_ALIGN(ramdisk_end);
return 1;
int i;
unsigned long addr = *addrp, last;
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->end) {
*addrp = addr = r->end;
changed = 1;
goto again;
}
}
#endif
/* kernel code */
if (last >= __pa_symbol(&_text) && addr < __pa_symbol(&_end)) {
*addrp = PAGE_ALIGN(__pa_symbol(&_end));
return 1;
}
if (last >= ebda_addr && addr < ebda_addr + ebda_size) {
*addrp = PAGE_ALIGN(ebda_addr + ebda_size);
return 1;
}
#ifdef CONFIG_NUMA
/* NUMA memory to node map */
if (last >= nodemap_addr && addr < nodemap_addr + nodemap_size) {
*addrp = nodemap_addr + nodemap_size;
return 1;
}
#endif
/* XXX ramdisk image here? */
return 0;
return changed;
}
/*

48
arch/x86/kernel/head64.c
View file

@ -21,6 +21,7 @@
#include <asm/tlbflush.h>
#include <asm/sections.h>
#include <asm/kdebug.h>
#include <asm/e820.h>
static void __init zap_identity_mappings(void)
{
@ -48,6 +49,35 @@ static void __init copy_bootdata(char *real_mode_data)
}
}
#define EBDA_ADDR_POINTER 0x40E
static __init void reserve_ebda(void)
{
unsigned ebda_addr, ebda_size;
/*
* there is a real-mode segmented pointer pointing to the
* 4K EBDA area at 0x40E
*/
ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
ebda_addr <<= 4;
if (!ebda_addr)
return;
ebda_size = *(unsigned short *)__va(ebda_addr);
/* Round EBDA up to pages */
if (ebda_size == 0)
ebda_size = 1;
ebda_size <<= 10;
ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
if (ebda_size > 64*1024)
ebda_size = 64*1024;
reserve_early(ebda_addr, ebda_addr + ebda_size);
}
void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
@ -75,5 +105,23 @@ void __init x86_64_start_kernel(char * real_mode_data)
pda_init(0);
copy_bootdata(__va(real_mode_data));
reserve_early(__pa_symbol(&_text), __pa_symbol(&_end));
/* Reserve INITRD */
if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
reserve_early(ramdisk_image, ramdisk_end);
}
reserve_ebda();
/*
* At this point everything still needed from the boot loader
* or BIOS or kernel text should be early reserved or marked not
* RAM in e820. All other memory is free game.
*/
start_kernel();
}

67
arch/x86/kernel/setup_64.c
View file

@ -245,41 +245,6 @@ static inline void __init reserve_crashkernel(void)
{}
#endif
#define EBDA_ADDR_POINTER 0x40E
unsigned __initdata ebda_addr;
unsigned __initdata ebda_size;
static void __init discover_ebda(void)
{
/*
* there is a real-mode segmented pointer pointing to the
* 4K EBDA area at 0x40E
*/
ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
/*
* There can be some situations, like paravirtualized guests,
* in which there is no available ebda information. In such
* case, just skip it
*/
if (!ebda_addr) {
ebda_size = 0;
return;
}
ebda_addr <<= 4;
ebda_size = *(unsigned short *)__va(ebda_addr);
/* Round EBDA up to pages */
if (ebda_size == 0)
ebda_size = 1;
ebda_size <<= 10;
ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
if (ebda_size > 64*1024)
ebda_size = 64*1024;
}
/* Overridden in paravirt.c if CONFIG_PARAVIRT */
void __attribute__((weak)) __init memory_setup(void)
{
@ -349,8 +314,6 @@ void __init setup_arch(char **cmdline_p)
check_efer();
discover_ebda();
init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
if (efi_enabled)
efi_init();
@ -397,33 +360,7 @@ void __init setup_arch(char **cmdline_p)
contig_initmem_init(0, end_pfn);
#endif
/* Reserve direct mapping */
reserve_bootmem_generic(table_start << PAGE_SHIFT,
(table_end - table_start) << PAGE_SHIFT);
/* reserve kernel */
reserve_bootmem_generic(__pa_symbol(&_text),
__pa_symbol(&_end) - __pa_symbol(&_text));
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem_generic(0, PAGE_SIZE);
/* reserve ebda region */
if (ebda_addr)
reserve_bootmem_generic(ebda_addr, ebda_size);
#ifdef CONFIG_NUMA
/* reserve nodemap region */
if (nodemap_addr)
reserve_bootmem_generic(nodemap_addr, nodemap_size);
#endif
#ifdef CONFIG_SMP
/* Reserve SMP trampoline */
reserve_bootmem_generic(SMP_TRAMPOLINE_BASE, 2*PAGE_SIZE);
#endif
early_res_to_bootmem();
#ifdef CONFIG_ACPI_SLEEP
/*
@ -453,6 +390,8 @@ void __init setup_arch(char **cmdline_p)
initrd_start = ramdisk_image + PAGE_OFFSET;
initrd_end = initrd_start+ramdisk_size;
} else {
/* Assumes everything on node 0 */
free_bootmem(ramdisk_image, ramdisk_size);
printk(KERN_ERR "initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
ramdisk_end, end_of_mem);

5
arch/x86/mm/init_64.c
View file

@ -176,7 +176,8 @@ __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
set_pte_phys(address, phys, prot);
}
unsigned long __meminitdata table_start, table_end;
static unsigned long __initdata table_start;
static unsigned long __meminitdata table_end;
static __meminit void *alloc_low_page(unsigned long *phys)
{
@ -387,6 +388,8 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
if (!after_bootmem)
mmu_cr4_features = read_cr4();
__flush_tlb_all();
reserve_early(table_start << PAGE_SHIFT, table_end << PAGE_SHIFT);
}
#ifndef CONFIG_NUMA

1
arch/x86/mm/numa_64.c
View file

@ -102,6 +102,7 @@ static int __init allocate_cachealigned_memnodemap(void)
}
pad_addr = (nodemap_addr + pad) & ~pad;
memnodemap = phys_to_virt(pad_addr);
reserve_early(nodemap_addr, nodemap_addr + nodemap_size);
printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
nodemap_addr, nodemap_addr + nodemap_size);

4
include/asm-x86/e820_64.h
View file

@ -41,8 +41,8 @@ extern void finish_e820_parsing(void);
extern struct e820map e820;
extern void update_e820(void);
extern unsigned ebda_addr, ebda_size;
extern unsigned long nodemap_addr, nodemap_size;
extern void reserve_early(unsigned long start, unsigned long end);
extern void early_res_to_bootmem(void);
#endif/*!__ASSEMBLY__*/

2
include/asm-x86/proto.h
View file

@ -22,8 +22,6 @@ extern void syscall32_cpu_init(void);
extern void check_efer(void);
extern unsigned long table_start, table_end;
extern int reboot_force;
long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);