e47183725d
- Make the secondary entry point be logically separate function, though declared in the same file. - Add a trick where the kernel base + 4 is the secondary entry point. Not really useful except makes it easy to compute the offset elsewhere. - Changed the entry point to arm64_reset and move _start to the linker script, which is what most other arches do. - While was in the linker script, make sure the text segment is aligned on MAXPAGESIZE, though doesn't make any real difference currently. - Generally clean up the assembly in start.S with newer macros from Fuchsia, and avoid using ldr X, =value as much as possible. - Fix and make sure arm64 can build and run with WITH_SMP set to false. Add a new no-smp project to test this. Note this will likely break systems where all of the cpus enter the kernel simultaneously, which we can fix if that becomes an issue. Secondary code now completely assumes the cpu number is passed in x0. This can be emulated with platform specific trampoline code if it needs to that then just directs into the the secondary entry point, instead of trying to make the arch code have to deal with all cases.
141 lines
3.8 KiB
Makefile
141 lines
3.8 KiB
Makefile
LOCAL_DIR := $(GET_LOCAL_DIR)
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MODULE := $(LOCAL_DIR)
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GLOBAL_DEFINES += \
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ARM64_CPU_$(ARM_CPU)=1 \
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ARM_ISA_ARMV8=1 \
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IS_64BIT=1
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MODULE_SRCS += \
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$(LOCAL_DIR)/arch.c \
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$(LOCAL_DIR)/asm.S \
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$(LOCAL_DIR)/cache-ops.S \
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$(LOCAL_DIR)/exceptions.S \
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$(LOCAL_DIR)/exceptions_c.c \
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$(LOCAL_DIR)/fpu.c \
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$(LOCAL_DIR)/spinlock.S \
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$(LOCAL_DIR)/start.S \
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$(LOCAL_DIR)/thread.c \
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$(LOCAL_DIR)/mp.c \
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# if its requested we build with SMP, default to 8 cpus
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ifeq (true,$(call TOBOOL,$(WITH_SMP)))
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SMP_MAX_CPUS ?= 8
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GLOBAL_DEFINES += \
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WITH_SMP=1 \
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SMP_MAX_CPUS=$(SMP_MAX_CPUS)
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else
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GLOBAL_DEFINES += \
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SMP_MAX_CPUS=1
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endif
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ARCH_OPTFLAGS := -O2
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# we have a mmu and want the vmm/pmm
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WITH_KERNEL_VM ?= 1
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ifeq (true,$(call TOBOOL,$(WITH_KERNEL_VM)))
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MODULE_SRCS += \
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$(LOCAL_DIR)/mmu.c
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ARM64_PAGE_SIZE ?= 4096
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# platform/target/project is allowed to override the page size the kernel
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# and user space will run at.
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ifeq ($(ARM64_PAGE_SIZE), 4096)
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# 48 bits of kernel and user address space (4 levels of page tables)
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KERNEL_ASPACE_BASE ?= 0xffff000000000000
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KERNEL_ASPACE_SIZE ?= 0x0001000000000000
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USER_ASPACE_BASE ?= 0x0000000001000000
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USER_ASPACE_SIZE ?= 0x0000fffffe000000
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else ifeq ($(ARM64_PAGE_SIZE), 16384)
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# 47 bits of kernel and user address space (3 levels of page tables)
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GLOBAL_DEFINES += ARM64_LARGE_PAGESIZE_16K=1
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KERNEL_ASPACE_BASE ?= 0xffff800000000000
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KERNEL_ASPACE_SIZE ?= 0x0000800000000000
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USER_ASPACE_BASE ?= 0x0000000001000000
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USER_ASPACE_SIZE ?= 0x00007ffffe000000
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else ifeq ($(ARM64_PAGE_SIZE), 65536)
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# 42 bits of kernel and user address space (2 levels of page tables)
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GLOBAL_DEFINES += ARM64_LARGE_PAGESIZE_64K=1
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KERNEL_ASPACE_BASE ?= 0xfffffc0000000000
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KERNEL_ASPACE_SIZE ?= 0x0000040000000000
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USER_ASPACE_BASE ?= 0x0000000001000000
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USER_ASPACE_SIZE ?= 0x000003fffe000000
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else
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$(error unsupported ARM64_PAGE_SIZE)
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endif
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GLOBAL_DEFINES += \
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KERNEL_ASPACE_BASE=$(KERNEL_ASPACE_BASE) \
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KERNEL_ASPACE_SIZE=$(KERNEL_ASPACE_SIZE) \
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USER_ASPACE_BASE=$(USER_ASPACE_BASE) \
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USER_ASPACE_SIZE=$(USER_ASPACE_SIZE) \
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ARCH_HAS_MMU=1
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KERNEL_BASE ?= $(KERNEL_ASPACE_BASE)
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KERNEL_LOAD_OFFSET ?= 0
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else # !WITH_KERNEL_VM
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KERNEL_BASE ?= $(MEMBASE)
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KERNEL_LOAD_OFFSET ?= 0
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endif
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GLOBAL_DEFINES += \
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KERNEL_BASE=$(KERNEL_BASE) \
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KERNEL_LOAD_OFFSET=$(KERNEL_LOAD_OFFSET)
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GLOBAL_DEFINES += \
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MEMBASE=$(MEMBASE) \
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MEMSIZE=$(MEMSIZE)
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# try to find the toolchain
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include $(LOCAL_DIR)/toolchain.mk
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TOOLCHAIN_PREFIX := $(ARCH_$(ARCH)_TOOLCHAIN_PREFIX)
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ARCH_COMPILEFLAGS += $(ARCH_$(ARCH)_COMPILEFLAGS)
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ARCH_COMPILEFLAGS += -ffixed-x18
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ARCH_COMPILEFLAGS += -fno-omit-frame-pointer
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ARCH_COMPILEFLAGS_NOFLOAT := -mgeneral-regs-only
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ARCH_COMPILEFLAGS_FLOAT :=
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ARCH_LDFLAGS += -z max-page-size=$(ARM64_PAGE_SIZE)
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# Note: assumes the use of gcc and the user is not overriding CC which is set later in engine.mk
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LIBGCC := $(shell $(TOOLCHAIN_PREFIX)gcc $(GLOBAL_COMPILEFLAGS) $(ARCH_COMPILEFLAGS) -print-libgcc-file-name)
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# make sure some bits were set up
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MEMVARS_SET := 0
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ifneq ($(MEMBASE),)
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MEMVARS_SET := 1
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endif
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ifneq ($(MEMSIZE),)
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MEMVARS_SET := 1
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endif
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ifeq ($(MEMVARS_SET),0)
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$(error missing MEMBASE or MEMSIZE variable, please set in target rules.mk)
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endif
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# potentially generated files that should be cleaned out with clean make rule
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GENERATED += \
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$(BUILDDIR)/system-onesegment.ld
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# rules for generating the linker script
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$(BUILDDIR)/system-onesegment.ld: $(LOCAL_DIR)/system-onesegment.ld $(wildcard arch/*.ld) linkerscript.phony
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@echo generating $@
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@$(MKDIR)
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$(NOECHO)sed "s/%MEMBASE%/$(MEMBASE)/;s/%MEMSIZE%/$(MEMSIZE)/;s/%KERNEL_BASE%/$(KERNEL_BASE)/;s/%KERNEL_LOAD_OFFSET%/$(KERNEL_LOAD_OFFSET)/" < $< > $@.tmp
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@$(call TESTANDREPLACEFILE,$@.tmp,$@)
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linkerscript.phony:
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.PHONY: linkerscript.phony
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MODULE_OPTIONS := extra_warnings
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include make/module.mk
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