contiki/cpu/x86/Makefile.x86_quarkX1000
Michael LeMay 4cdb7ba9b6 x86: Add TSS-based protection domain support
This patch extends the protection domain framework with an additional
plugin to use Task-State Segment (TSS) structures to offload much of
the work of switching protection domains to the CPU.  This can save
space compared to paging, since paging requires two 4KiB page tables
and one 32-byte page table plus one whole-system TSS and an additional
32-byte data structure for each protection domain, whereas the
approach implemented by this patch just requires a 128-byte data
structure for each protection domain.  Only a small number of
protection domains will typically be used, so
n * 128 < 8328 + (n * 32).

For additional information, please refer to cpu/x86/mm/README.md.

GCC 6 is introducing named address spaces for the FS and GS segments
[1].  LLVM Clang also provides address spaces for the FS and GS
segments [2].  This patch also adds support to the multi-segment X86
memory management subsystem for using these features instead of inline
assembly blocks, which enables type checking to detect some address
space mismatches.

[1] https://gcc.gnu.org/onlinedocs/gcc/Named-Address-Spaces.html
[2] http://llvm.org/releases/3.3/tools/clang/docs/LanguageExtensions.html#target-specific-extensions
2016-04-22 08:16:39 -07:00

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Makefile

# See mm/README.md for a description of available settings:
X86_CONF_PROT_DOMAINS ?= none
include $(CONTIKI)/cpu/x86/Makefile.x86_common
CONTIKI_CPU_DIRS += drivers/legacy_pc drivers/quarkX1000 init/legacy_pc net mm
CONTIKI_SOURCEFILES += bootstrap_quarkX1000.S rtc.c pit.c pic.c irq.c nmi.c pci.c uart-16x50.c uart.c gpio.c i2c.c eth.c shared-isr.c
CONTIKI_SOURCEFILES += imr.c msg-bus.c
CONTIKI_SOURCEFILES += stacks.c
ifneq ($(X86_CONF_PROT_DOMAINS),none)
CONTIKI_SOURCEFILES += prot-domains.c $(X86_CONF_PROT_DOMAINS)-prot-domains.c imr-conf.c
ifeq ($(X86_CONF_PROT_DOMAINS),paging)
LINKERSCRIPT_SFX = _paging
X86_CONF_SYSCALLS_INT = 1
ifeq ($(X86_CONF_USE_INVLPG),1)
CFLAGS += -DX86_CONF_USE_INVLPG
endif
# This matches the definition of X86_CONF_PROT_DOMAINS__PAGING in prot-domains.h:
CFLAGS += -DX86_CONF_PROT_DOMAINS=1
else ifeq ($(X86_CONF_PROT_DOMAINS),tss)
# This matches the definition of X86_CONF_PROT_DOMAINS__TSS in prot-domains.h:
CFLAGS += -DX86_CONF_PROT_DOMAINS=2
X86_CONF_MULTI_SEG = 1
CONTIKI_SOURCEFILES += tss-prot-domains-asm.S
else
$(error Unrecognized setting for X86_CONF_PROT_DOMAINS: \
$(X86_CONF_PROT_DOMAINS). See cpu/x86/mm/README.md for \
descriptions of available settings)
endif
ifeq ($(X86_CONF_SYSCALLS_INT),1)
CONTIKI_SOURCEFILES += syscalls-int-asm.S tss.c
endif
ifeq ($(X86_CONF_MULTI_SEG),1)
LINKERSCRIPT_SFX = _multi_seg
CONTIKI_SOURCEFILES += multi-segment.c
# Due to the way the multi-segment implementation of protection domains define
# tightly-bounded stack segments, the base pointer register cannot be used as
# a general-purpose register in all circumstances. The stack segment is used
# by default for a data access that uses the base pointer as the base register
# to compute the address. If the data referenced by the base pointer is not
# on the stack, then the access will fail. Thus, it is necessary to disable
# the omit-frame-pointer optimization. See mm/README.md for more details of
# how multi-segment protection domains are implemented.
CFLAGS += -fno-omit-frame-pointer
endif
endif
CFLAGS += -m32 -march=i586 -mtune=i586
LDFLAGS += -m32 -Xlinker -T -Xlinker $(CONTIKI)/cpu/x86/quarkX1000$(LINKERSCRIPT_SFX).ld
# The C compiler is used to invoke the assembler, so the CFLAGS should be
# passed to it on the command line:
ASFLAGS = -c $(CFLAGS)
ifeq ($(X86_CONF_RESTRICT_DMA),1)
CONTIKI_SOURCEFILES += imr-conf.c
CFLAGS += -DX86_CONF_RESTRICT_DMA
LDFLAGS += -Xlinker -T -Xlinker $(CONTIKI)/cpu/x86/quarkX1000_dma.ld
endif
### UEFI support
UEFI_DIR = $(CONTIKI_CPU)/uefi
ifndef EN_UEFI
# Include a Makefile generated by the build_uefi.sh script, if available.
# If that script was not run, then UEFI support will not be built.
-include $(UEFI_DIR)/Makefile.uefi
endif
ifeq ($(EN_UEFI),1)
EDK2_DIR = $(UEFI_DIR)/edk2
GEN_FW = $(EDK2_DIR)/BaseTools/Source/C/bin/GenFw
CONTIKI_CPU_DIRS += uefi
CONTIKI_SOURCEFILES += bootstrap_uefi.c
CFLAGS += -I$(EDK2_DIR)/MdePkg/Include -I$(EDK2_DIR)/MdePkg/Include/Ia32
else
$(info Note: UEFI support is disabled.)
$(info To enable UEFI support, run $(CONTIKI_CPU)/uefi/build_uefi.sh prior)
$(info to building Contiki.)
endif