* docs/grub-dev.texi: Document stack and heap sizes.
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Vladimir Serbinenko
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@ -1,3 +1,7 @@
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2013-11-22 Vladimir Serbinenko <phcoder@gmail.com>
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* docs/grub-dev.texi: Document stack and heap sizes.
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2013-11-22 Vladimir Serbinenko <phcoder@gmail.com>
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2013-11-22 Vladimir Serbinenko <phcoder@gmail.com>
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* include/grub/i386/pc/memory.h: Decrease
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* include/grub/i386/pc/memory.h: Decrease
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@ -79,6 +79,7 @@ This edition documents version @value{VERSION}.
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* Contributing Changes::
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* Contributing Changes::
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* Porting::
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* Porting::
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* Error Handling::
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* Error Handling::
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* Stack and heap size::
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* BIOS port memory map::
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* BIOS port memory map::
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* Video Subsystem::
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* Video Subsystem::
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* PFF2 Font File Format::
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* PFF2 Font File Format::
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@ -906,6 +907,69 @@ if (grub_errno != GRUB_ERR_NONE)
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grub_error_pop ();
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grub_error_pop ();
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@end example
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@end example
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@node Stack and heap size
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@chapter Stack and heap size
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On emu stack and heap are just normal host OS stack and heap. Stack is typically
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8 MiB although it's OS-dependent.
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On i386-pc, i386-coreboot, i386-qemu and i386-multiboot the stack is 60KiB.
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All available space between 1MiB and 4GiB marks is part of heap.
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On *-xen stack is 4MiB. If compiled for x86-64 with GCC 4.4 or later adressable
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space is unlimited. When compiled for x86-64 with older GCC version adressable
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space is limited to 2GiB. When compiling for i386 adressable space is limited
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to 4GiB. All adressable pages except the ones for stack, GRUB binary, special
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pages and page table are in the heap.
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On *-efi GRUB uses same stack as EFI. If compiled for x86-64 with GCC 4.4 or
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later adressable space is unlimited. When compiled for x86-64 with older GCC
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version adressable space is limited to 2GiB. For all other platforms adressable
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space is limited to 4GiB. GRUB allocates pages from EFI for its heap, at most
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1.6 GiB.
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On i386-ieee1275 and powerpc-ieee1275 GRUB uses same stack as IEEE1275.
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It allocates at most 32MiB for its heap.
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On sparc64-ieee1275 stack is 256KiB and heap is 2MiB.
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On mips(el)-qemu_mips and mipsel-loongson stack is 2MiB (everything below
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GRUB image) and everything above GRUB image (from 2MiB + kernel size)
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until 256MiB is part of heap.
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On mips-arc stack is 2MiB (everything below GRUB image) and everything above
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GRUB image(from 2MiB + kernel size) until 128MiB is part of heap.
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On mipsel-arc stack is 2MiB (everything below GRUB image which is not part
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of ARC) and everything above GRUB image (from 7MiB + kernel size)
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until 256MiB is part of heap.
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On arm-uboot stack is 256KiB and heap is 2MiB.
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In short:
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@multitable @columnfractions .15 .25 .5
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@headitem Platform @tab Stack @tab Heap
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@item emu @tab 8 MiB @tab ?
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@item i386-pc @tab 60 KiB @tab < 4 GiB
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@item i386-coreboot @tab 60 KiB @tab < 4 GiB
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@item i386-multiboot @tab 60 KiB @tab < 4 GiB
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@item i386-qemu @tab 60 KiB @tab < 4 GiB
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@item *-efi @tab ? @tab < 1.6 GiB
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@item i386-ieee1275 @tab ? @tab < 32 MiB
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@item powerpc-ieee1275 @tab ? @tab < 32 MiB
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@item sparc64-ieee1275 @tab 256KiB @tab 2 MiB
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@item arm-uboot @tab 256KiB @tab 2 MiB
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@item mips(el)-qemu_mips @tab 2MiB @tab 253 MiB
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@item mipsel-loongson @tab 2MiB @tab 253 MiB
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@item mips-arc @tab 2MiB @tab 125 MiB
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@item mipsel-arc @tab 2MiB @tab 248 MiB
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@item x86_64-xen (GCC >= 4.4) @tab 4MiB @tab unlimited
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@item x86_64-xen (GCC < 4.4) @tab 4MiB @tab < 2GiB
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@item i386-xen @tab 4MiB @tab < 4GiB
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@end multitable
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@node BIOS port memory map
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@node BIOS port memory map
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@chapter BIOS port memory map
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@chapter BIOS port memory map
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@c By Yoshinori K Okuji
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@c By Yoshinori K Okuji
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@ -917,9 +981,8 @@ grub_error_pop ();
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@item ? @tab 0x2000 - 1 @tab Real mode stack
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@item ? @tab 0x2000 - 1 @tab Real mode stack
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@item 0x7C00 @tab 0x7D00 - 1 @tab Boot sector
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@item 0x7C00 @tab 0x7D00 - 1 @tab Boot sector
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@item 0x8000 @tab ? @tab GRUB kernel
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@item 0x8000 @tab ? @tab GRUB kernel
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@item 0x68000 @tab 0x78000 - 1 @tab Disk buffer
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@item 0x68000 @tab 0x71000 - 1 @tab Disk buffer
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@item ? @tab 0x80000 - 1 @tab Protected mode stack
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@item ? @tab 0x80000 - 1 @tab Protected mode stack
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@item 0x80000 @tab ? @tab Heap
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@item ? @tab 0xA0000 - 1 @tab Extended BIOS Data Area
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@item ? @tab 0xA0000 - 1 @tab Extended BIOS Data Area
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@item 0xA0000 @tab 0xC0000 - 1 @tab Video RAM
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@item 0xA0000 @tab 0xC0000 - 1 @tab Video RAM
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@item 0xC0000 @tab 0x100000 - 1 @tab BIOS
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@item 0xC0000 @tab 0x100000 - 1 @tab BIOS
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