# 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 = .226
LINUX_VERSION-4.14 = .183
LINUX_VERSION-4.19 = .126
LINUX_VERSION-5.4 = .45

LINUX_KERNEL_HASH-4.9.226 = 460a8c168fe5c60ce5b30015a4e4bf348d93a89f8b949de1f90779567ef345ca
LINUX_KERNEL_HASH-4.14.183 = 4265afef56819b04656107a5abecde205c5bc5fb04b2e81447955e7e45db8085
LINUX_KERNEL_HASH-4.19.126 = 6e2a7e0adbe31e39cc8f1a3bd7bfa0d92ec0a4ca5360bb25829db831378f3f89
LINUX_KERNEL_HASH-5.4.45 = 103f039f34a9009c42ea643b4f473bda6bb9607d5ad7f63b56b3e2351615fe2e

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