Jeremy Fitzhardinge 93dbda7cbc x86: add brk allocation for very, very early allocations ... Impact: new interface Add a brk()-like allocator which effectively extends the bss in order to allow very early code to do dynamic allocations. This is better than using statically allocated arrays for data in subsystems which may never get used. The space for brk allocations is in the bss ELF segment, so that the space is mapped properly by the code which maps the kernel, and so that bootloaders keep the space free rather than putting a ramdisk or something into it. The bss itself, delimited by __bss_stop, ends before the brk area (__brk_base to __brk_limit). The kernel text, data and bss is reserved up to __bss_stop. Any brk-allocated data is reserved separately just before the kernel pagetable is built, as that code allocates from unreserved spaces in the e820 map, potentially allocating from any unused brk memory. Ultimately any unused memory in the brk area is used in the general kernel memory pool. Initially the brk space is set to 1MB, which is probably much larger than any user needs (the largest current user is i386 head_32.S's code to build the pagetables to map the kernel, which can get fairly large with a big kernel image and no PSE support). So long as the system has sufficient memory for the bootloader to reserve the kernel+1MB brk, there are no bad effects resulting from an over-large brk. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>		2009-03-14 15:37:14 -07:00
..
uv	x86: UV, SGI RTC: loop through installed UV blades	2009-03-04 20:25:37 +01:00
visws
xen	xen: deal with virtually mapped percpu data	2009-03-02 12:58:19 +01:00
a.out-core.h	x86: add %gs accessors for x86_32	2009-02-10 00:41:58 +01:00
a.out.h
acpi.h	x86: use early_ioremap in __acpi_map_table	2009-02-09 13:33:51 +01:00
agp.h
alternative-asm.h
alternative.h
amd_iommu_types.h	AMD IOMMU: add init code for statistic collection	2009-01-03 14:11:58 +01:00
amd_iommu.h
apic.h	x86: UV, SGI RTC: add generic system vector, build fix on UP	2009-03-05 15:15:56 +01:00
apicdef.h	x86, mce, cmci: define MSR names and fields for new CMCI registers	2009-02-24 13:41:00 -08:00
apicnum.h	irq: initialize nr_irqs based on nr_cpu_ids	2009-01-11 19:13:38 +01:00
apm.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
asm.h
atomic_32.h	atomic_t: unify all arch definitions	2009-01-06 15:59:10 -08:00
atomic_64.h	atomic_t: unify all arch definitions	2009-01-06 15:59:10 -08:00
atomic.h
auxvec.h
bios_ebda.h
bitops.h	x86, generic: mark complex bitops.h inlines as __always_inline	2009-01-13 18:56:30 +01:00
boot.h	x86: remove zImage support	2009-03-11 11:00:00 -07:00
bootparam.h
bug.h
bugs.h
byteorder.h	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
cache.h
cacheflush.h	x86: convert cacheflush macros inline functions	2009-02-25 11:06:51 +09:00
calgary.h
calling.h	x86: document 64-bit and 32-bit function call convention ABI	2009-02-03 19:48:18 +01:00
checksum_32.h
checksum_64.h
checksum.h
cmpxchg_32.h
cmpxchg_64.h
cmpxchg.h
compat.h
cpu_debug.h	x86: cpu architecture debug code	2009-03-10 18:39:45 +01:00
cpu.h	x86: generalize boot_cpu_id	2009-01-29 14:17:01 +01:00
cpufeature.h	x86: add clflush before monitor for Intel 7400 series	2009-02-09 11:15:15 +01:00
cpumask.h	x86: move setup_cpu_local_masks()	2009-01-27 12:56:47 +09:00
cputime.h
current.h	x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit.	2009-01-19 00:38:58 +09:00
debugreg.h
delay.h
desc_defs.h
desc.h	x86: cpu architecture debug code, build fix, cleanup	2009-03-11 14:52:03 +01:00
device.h
div64.h
dma-mapping.h	Documentation: move DMA-mapping.txt to Doc/PCI/	2009-01-29 18:19:29 -08:00
dma.h
dmi.h
do_timer.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
ds.h
dwarf2.h
e820.h	headers_check fix: x86, e820.h	2009-01-31 00:16:22 +05:30
edac.h
efi.h	x86: EFI: Back efi_ioremap with init_memory_mapping instead of FIX_MAP	2009-03-04 19:20:16 +01:00
elf.h	x86: make lazy %gs optional on x86_32	2009-02-10 00:42:00 +01:00
emergency-restart.h
entry_arch.h	x86: UV, SGI RTC: add generic system vector	2009-03-04 20:25:37 +01:00
errno.h
fb.h
fcntl.h
fixmap.h	Merge branch 'x86/urgent' into x86/core	2009-03-05 21:48:50 +01:00
floppy.h
frame.h
ftrace.h
futex.h
gart.h
genapic.h	x86, apic: merge genapic.h into apic.h	2009-02-17 17:52:43 +01:00
geode.h
gpio.h
hardirq.h	x86: UV, SGI RTC: add generic system vector	2009-03-04 20:25:37 +01:00
highmem.h	x86: unify kmap_atomic_pfn() and iomap_atomic_prot_pfn()	2009-03-11 15:47:46 +01:00
hpet.h
hugetlb.h
hw_irq.h	x86: UV, SGI RTC: add generic system vector	2009-03-04 20:25:37 +01:00
hypertransport.h
hypervisor.h
i387.h	x86, math-emu: fix init_fpu for task != current	2009-03-04 20:33:16 +01:00
i8253.h
i8259.h	x86: refactor x86_quirks support	2009-02-23 00:08:11 +01:00
ia32_unistd.h
ia32.h
idle.h
init.h	x86: move function and variable declarations to asm/init.h	2009-03-05 14:17:18 +01:00
intel_arch_perfmon.h
io_32.h	Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core	2009-02-13 09:46:36 +01:00
io_64.h	Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core	2009-02-13 09:46:36 +01:00
io_apic.h	x86: unstatic ioapic entry funcs	2009-02-09 14:04:31 -08:00
io.h	x86: remove vestigial fix_ioremap prototypes	2009-03-04 02:29:32 +01:00
ioctl.h
ioctls.h
iomap.h	Revert "gpu/drm, x86, PAT: PAT support for io_mapping_*"	2009-03-01 12:47:49 +01:00
iommu.h
ipcbuf.h
ipi.h	x86, apic: remove duplicate asm/apic.h inclusions	2009-02-17 17:52:44 +01:00
irq_regs.h	x86: merge irq_regs.h	2009-01-21 17:26:06 +09:00
irq_remapping.h
irq_vectors.h	x86: UV, SGI RTC: add generic system vector	2009-03-04 20:25:37 +01:00
irq.h	x86: UV, SGI RTC: add generic system vector	2009-03-04 20:25:37 +01:00
irqflags.h
ist.h
k8.h
Kbuild	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
kdebug.h
kexec.h	x86, kexec: x86_64: add kexec jump support for x86_64	2009-03-10 18:13:25 -07:00
kgdb.h
kmap_types.h
kprobes.h
kvm_host.h	KVM: change KVM to use IOMMU API	2009-01-03 14:11:07 +01:00
kvm_para.h
kvm_x86_emulate.h	KVM: x86 emulator: add Src2 decode set	2008-12-31 16:55:42 +02:00
kvm.h	KVM: Avoid using CONFIG_ in userspace visible headers	2009-02-15 02:47:35 +02:00
ldt.h
lguest_hcall.h
lguest.h	x86: cleanup some remaining usages of NR_CPUS where s/b nr_cpu_ids	2009-01-03 19:00:55 +01:00
linkage.h	x86: shrink __ALIGN and __ALIGN_STR definitions	2009-03-11 12:39:28 +01:00
local.h
mach_timer.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
mach_traps.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
math_emu.h	x86: fix math_emu register frame access	2009-02-10 00:39:14 +01:00
mc146818rtc.h
mca_dma.h
mca.h
mce.h	x86, mce, cmci: add CMCI support	2009-02-24 13:41:00 -08:00
microcode.h
mman.h
mmconfig.h
mmu_context.h	x86: make lazy %gs optional on x86_32	2009-02-10 00:42:00 +01:00
mmu.h
mmx.h
mmzone_32.h	bootmem, x86: further fixes for arch-specific bootmem wrapping	2009-03-01 16:06:56 +09:00
mmzone_64.h	mm: clean up for early_pfn_to_nid()	2009-02-18 15:37:55 -08:00
mmzone.h
module.h
mpspec_def.h	x86: rename all fields of mpf_intel mpf_X to X	2009-01-08 15:37:37 +01:00
mpspec.h	x86, numaq_32: clean up, misc	2009-02-17 17:53:54 +01:00
msgbuf.h
msidef.h
msr-index.h	x86, mce, cmci: define MSR names and fields for new CMCI registers	2009-02-24 13:41:00 -08:00
msr.h
mtrr.h	headers_check fix: x86, mtrr.h	2009-01-31 00:17:39 +05:30
mutex_32.h
mutex_64.h
mutex.h
nmi.h
nops.h
numa_32.h	x86: set_highmem_pages_init() cleanup	2009-03-03 13:13:15 +01:00
numa_64.h
numa.h
numaq.h	x86, numaq: cleanups	2009-02-05 22:30:14 +01:00
olpc.h
page_32_types.h	x86: move more pagetable-related definitions into pgtable*.h	2009-02-13 11:35:01 -08:00
page_32.h	x86 headers: protect page_32.h via __ASSEMBLY__	2009-02-13 13:36:47 +01:00
page_64_types.h	x86: move more pagetable-related definitions into pgtable*.h	2009-02-13 11:35:01 -08:00
page_64.h	x86: create _types.h counterparts for page*.h	2009-02-11 14:54:09 -08:00
page_types.h	x86: clean up old gcc warnings	2009-03-05 14:50:55 +01:00
page.h	x86 headers: include linux/types.h	2009-02-13 13:23:02 +01:00
param.h
paravirt.h	Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-02-17 14:27:39 -08:00
parport.h
pat.h	x86: clean up old gcc warnings	2009-03-05 14:50:55 +01:00
pci_32.h
pci_64.h
pci_x86.h
pci-direct.h
pci-functions.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
pci.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2008-12-31 23:05:57 +10:30
percpu.h	percpu: make x86 addr <-> pcpu ptr conversion macros generic	2009-03-10 16:27:48 +09:00
pgalloc.h	x86, mm: fix pte_free()	2009-01-23 18:42:06 +01:00
pgtable_32_types.h	x86-32: use specific __vmalloc_start_set flag in __virt_addr_valid	2009-03-05 14:53:10 +01:00
pgtable_32.h	x86: Split pgtable_32.h into pgtable_32.h and pgtable_32_types.h	2009-02-11 14:54:09 -08:00
pgtable_64_types.h	x86: move more pagetable-related definitions into pgtable*.h	2009-02-13 11:35:01 -08:00
pgtable_64.h	Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/header-fixes', 'x86/headers' and 'x86/minor-fixes' into x86/core	2009-02-13 09:46:36 +01:00
pgtable_types.h	x86: move init_memory_mapping() to common mm/init.c, build fix on 32-bit PAE	2009-03-05 14:39:03 +01:00
pgtable-2level_types.h	x86: move more pagetable-related definitions into pgtable*.h	2009-02-13 11:35:01 -08:00
pgtable-2level.h	x86: unify pte_none	2009-02-06 12:26:08 -08:00
pgtable-3level_types.h	x86: move more pagetable-related definitions into pgtable*.h	2009-02-13 11:35:01 -08:00
pgtable-3level.h	x86: unify pud_none	2009-02-06 12:31:51 -08:00
pgtable.h	Merge branch 'tj-percpu' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into core/percpu	2009-02-24 21:52:45 +01:00
poll.h
posix_types_32.h
posix_types_64.h
posix_types.h
prctl.h	headers_check fix: x86, prctl.h	2009-02-02 23:27:09 +05:30
processor-cyrix.h
processor-flags.h
processor.h	x86-32: use non-lazy io bitmap context switching	2009-03-02 12:07:48 +01:00
proto.h	x86/Voyager: remove X86_BIOS_REBOOT Kconfig quirk	2009-01-29 14:17:03 +01:00
ptrace-abi.h	headers_check fix: x86, ptrace-abi.h	2009-01-31 00:18:03 +05:30
ptrace.h	x86: make lazy %gs optional on x86_32	2009-02-10 00:42:00 +01:00
pvclock-abi.h
pvclock.h
rdc321x_defs.h	x86, rdc321x: remove/move leftover files	2009-01-18 19:39:18 +01:00
reboot_fixups.h
reboot.h
required-features.h
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h
scatterlist.h
seccomp_32.h	x86-64: seccomp: fix 32/64 syscall hole	2009-03-02 15:41:30 -08:00
seccomp_64.h	x86-64: seccomp: fix 32/64 syscall hole	2009-03-02 15:41:30 -08:00
seccomp.h
sections.h	x86: add brk allocation for very, very early allocations	2009-03-14 15:37:14 -07:00
segment.h	x86: implement x86_32 stack protector	2009-02-10 00:42:01 +01:00
sembuf.h
serial.h
setup_arch.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
setup.h	x86: add brk allocation for very, very early allocations	2009-03-14 15:37:14 -07:00
shmbuf.h
shmparam.h
sigcontext32.h	headers_check fix: x86, sigcontext32.h	2009-01-31 00:18:58 +05:30
sigcontext.h	headers_check fix: x86, sigcontext.h	2009-01-31 00:18:30 +05:30
sigframe.h
siginfo.h
signal.h
smp.h	x86: remove mach_apic.h	2009-01-29 14:16:42 +01:00
smpboot_hooks.h	x86: move mach-default/*.h files to asm/	2009-01-29 14:16:51 +01:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h
spinlock.h	Merge branch 'linus' into x86/apic	2009-02-13 09:44:22 +01:00
srat.h
stackprotector.h	x86: fix x86_32 stack protector bugs	2009-02-11 11:33:49 +01:00
stacktrace.h
stat.h
statfs.h
string_32.h
string_64.h
string.h
suspend_32.h
suspend_64.h
suspend.h
svm.h	KVM: SVM: move svm.h to include/asm	2008-12-31 16:52:28 +02:00
swab.h	headers_check fix: x86, swab.h	2009-01-31 00:19:32 +05:30
swiotlb.h
sync_bitops.h
sys_ia32.h
syscall.h
syscalls.h	x86: syscalls.h: remove asmlinkage from declaration of sys_rt_sigreturn()	2009-02-19 12:18:54 +01:00
system_64.h
system.h	x86: add forward decl for tss_struct	2009-03-02 12:07:49 +01:00
tce.h
termbits.h
termios.h
therm_throt.h
thread_info.h	Merge branch 'x86/uaccess' into core/percpu	2009-02-10 00:40:48 +01:00
time.h
timer.h	x86: refactor x86_quirks support	2009-02-23 00:08:11 +01:00
timex.h	x86: use standard PIT frequency	2009-01-25 16:57:47 +01:00
tlb.h
tlbflush.h	x86-64: Move TLB state from PDA to per-cpu and consolidate with 32-bit.	2009-01-19 00:38:57 +09:00
topology.h	x86: move 64-bit NUMA code	2009-01-27 12:56:47 +09:00
trampoline.h	x86: load pointer to pda into %gs while brining up a CPU	2009-01-16 14:19:26 +01:00
traps.h	x86: use pt_regs pointer in do_device_not_available()	2009-02-11 12:40:44 +01:00
tsc.h
types.h
uaccess_32.h	x86, mm: dont use non-temporal stores in pagecache accesses	2009-03-02 11:06:49 +01:00
uaccess_64.h	x86, mm: dont use non-temporal stores in pagecache accesses	2009-03-02 11:06:49 +01:00
uaccess.h	x86: uaccess: use errret as error value in __put_user_size()	2009-02-04 17:28:21 -08:00
ucontext.h
unaligned.h
unistd_32.h
unistd_64.h
unistd.h
user32.h
user_32.h
user_64.h
user.h
vdso.h
vga.h
vgtod.h
virtext.h	x86: cpu_emergency_svm_disable() function	2008-12-31 16:52:30 +02:00
vm86.h
vmi_time.h
vmi.h
vmware.h
vmx.h	KVM: VMX: move ASM_VMX_* definitions from asm/kvm_host.h to asm/vmx.h	2008-12-31 16:52:28 +02:00
vsyscall.h
xcr.h
xor_32.h
xor_64.h
xor.h
xsave.h