# Use the default kernel version if the Makefile doesn't override it

LINUX_RELEASE?=1

ifdef CONFIG_TESTING_KERNEL
  KERNEL_PATCHVER:=$(KERNEL_TESTING_PATCHVER)
endif

LINUX_VERSION-4.9 = .222
LINUX_VERSION-4.14 = .179
LINUX_VERSION-4.19 = .121
LINUX_VERSION-5.4 = .39

LINUX_KERNEL_HASH-4.9.222 = 4cce9016eba7bbc51989d4fc6a5811a0f1c65e6d79a0b6203b7299e4a87b5229
LINUX_KERNEL_HASH-4.14.179 = 5da7eb5c94904ee31db7e25eb7be53e27a34c9a7fde2ee4bb0b3af7b87cc5981
LINUX_KERNEL_HASH-4.19.121 = fbe5a813ae0b2d37f25f122a005f341130fbe59cad63e2601784411855937085
LINUX_KERNEL_HASH-5.4.39 = 5141965a61a7b1c538443782ec3ef25fe0c3f9cd4d70c4e9f969d16883f365c8

remove_uri_prefix=$(subst git://,,$(subst http://,,$(subst https://,,$(1))))
sanitize_uri=$(call qstrip,$(subst @,_,$(subst :,_,$(subst .,_,$(subst -,_,$(subst /,_,$(1)))))))

ifneq ($(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),)
  LINUX_VERSION:=$(call sanitize_uri,$(call remove_uri_prefix,$(CONFIG_KERNEL_GIT_CLONE_URI)))
  ifeq ($(call qstrip,$(CONFIG_KERNEL_GIT_REF)),)
    CONFIG_KERNEL_GIT_REF:=HEAD
  endif
  LINUX_VERSION:=$(LINUX_VERSION)-$(call sanitize_uri,$(CONFIG_KERNEL_GIT_REF))
else
ifdef KERNEL_PATCHVER
  LINUX_VERSION:=$(KERNEL_PATCHVER)$(strip $(LINUX_VERSION-$(KERNEL_PATCHVER)))
endif
ifdef KERNEL_TESTING_PATCHVER
  LINUX_TESTING_VERSION:=$(KERNEL_TESTING_PATCHVER)$(strip $(LINUX_VERSION-$(KERNEL_TESTING_PATCHVER)))
endif
endif

split_version=$(subst ., ,$(1))
merge_version=$(subst $(space),.,$(1))
KERNEL_BASE=$(firstword $(subst -, ,$(LINUX_VERSION)))
KERNEL=$(call merge_version,$(wordlist 1,2,$(call split_version,$(KERNEL_BASE))))
KERNEL_PATCHVER ?= $(KERNEL)

# disable the md5sum check for unknown kernel versions
LINUX_KERNEL_HASH:=$(LINUX_KERNEL_HASH-$(strip $(LINUX_VERSION)))
LINUX_KERNEL_HASH?=x