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linux/arch/x86/include/asm
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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.h
amd_iommu_types.h AMD IOMMU: add init code for statistic collection 2009-01-03 14:11:58 +01:00
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.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
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.h
checksum_32.h
checksum_64.h
cmpxchg.h
cmpxchg_32.h
cmpxchg_64.h
compat.h
cpu.h x86: generalize boot_cpu_id 2009-01-29 14:17:01 +01:00
cpu_debug.h x86: cpu architecture debug code 2009-03-10 18:39:45 +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.h x86: cpu architecture debug code, build fix, cleanup 2009-03-11 14:52:03 +01:00
desc_defs.h
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.h
ia32_unistd.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.h x86: remove vestigial fix_ioremap prototypes 2009-03-04 02:29:32 +01:00
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
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 Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-30 16:10:19 -08:00
ipcbuf.h
ipi.h x86, apic: remove duplicate asm/apic.h inclusions 2009-02-17 17:52:44 +01:00
irq.h x86: UV, SGI RTC: add generic system vector 2009-03-04 20:25:37 +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
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.h KVM: Avoid using CONFIG_ in userspace visible headers 2009-02-15 02:47:35 +02:00
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
ldt.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
lguest_hcall.h
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.h
mca_dma.h
mce.h x86, mce, cmci: add CMCI support 2009-02-24 13:41:00 -08:00
microcode.h
mman.h
mmconfig.h
mmu.h
mmu_context.h x86: make lazy %gs optional on x86_32 2009-02-10 00:42:00 +01:00
mmx.h
mmzone.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
module.h
mpspec.h x86, numaq_32: clean up, misc 2009-02-17 17:53:54 +01:00
mpspec_def.h x86: rename all fields of mpf_intel mpf_X to X 2009-01-08 15:37:37 +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 Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-28 12:21:10 -08:00
mtrr.h headers_check fix: x86, mtrr.h 2009-01-31 00:17:39 +05:30
mutex.h
mutex_32.h
mutex_64.h
nmi.h
nops.h
numa.h
numa_32.h x86: set_highmem_pages_init() cleanup 2009-03-03 13:13:15 +01:00
numa_64.h
numaq.h x86, numaq: cleanups 2009-02-05 22:30:14 +01:00
olpc.h
page.h x86 headers: include linux/types.h 2009-02-13 13:23:02 +01:00
page_32.h x86 headers: protect page_32.h via __ASSEMBLY__ 2009-02-13 13:36:47 +01:00
page_32_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_64_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
page_types.h x86: clean up old gcc warnings 2009-03-05 14:50:55 +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-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
pci_32.h
pci_64.h
pci_x86.h x86, pci: move arch/x86/pci/pci.h to arch/x86/include/asm/pci_x86.h 2008-12-29 18:17:36 +01:00
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-2level.h x86: unify pte_none 2009-02-06 12:26:08 -08:00
pgtable-2level_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-3level_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -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
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_32_types.h x86-32: use specific __vmalloc_start_set flag in __virt_addr_valid 2009-03-05 14:53:10 +01:00
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_64_types.h x86: move more pagetable-related definitions into pgtable*.h 2009-02-13 11:35:01 -08:00
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
poll.h
posix_types.h
posix_types_32.h
posix_types_64.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.h
reboot_fixups.h
required-features.h
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h
scatterlist.h
seccomp.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
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.h x86: add brk allocation for very, very early allocations 2009-03-14 15:37:14 -07:00
setup_arch.h x86: move mach-default/*.h files to asm/ 2009-01-29 14:16:51 +01:00
shmbuf.h
shmparam.h
sigcontext.h headers_check fix: x86, sigcontext.h 2009-01-31 00:18:30 +05:30
sigcontext32.h headers_check fix: x86, sigcontext32.h 2009-01-31 00:18:58 +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.h Merge branch 'linus' into x86/apic 2009-02-13 09:44:22 +01:00
spinlock_types.h
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.h
string_32.h
string_64.h
suspend.h
suspend_32.h
suspend_64.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 swiotlb: replace architecture-specific swiotlb.h with linux/swiotlb.h 2008-12-28 10:04:00 +01:00
sync_bitops.h
sys_ia32.h x86: introducing asm/sys_ia32.h 2008-12-29 13:18:40 +01:00
syscall.h
syscalls.h x86: syscalls.h: remove asmlinkage from declaration of sys_rt_sigreturn() 2009-02-19 12:18:54 +01:00
system.h x86: add forward decl for tss_struct 2009-03-02 12:07:49 +01:00
system_64.h
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.h x86: uaccess: use errret as error value in __put_user_size() 2009-02-04 17:28:21 -08:00
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
ucontext.h
unaligned.h
unistd.h
unistd_32.h
unistd_64.h
user.h
user32.h
user_32.h
user_64.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.h
vmi_time.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.h
xor_32.h
xor_64.h
xsave.h